Page 1 Operation and Remote Programming Manual ML2437A / ML2438A Power Meter Anritsu Company Part Number: 10585-00001 490 Jarvis Drive Revision: P Morgan Hill, CA 95037-2809 Published: October 2017 Copyright 2017 Anritsu Company http://www.anritsu.com...
Page 3: Table Of Contents
Clearing the Non-Volatile Static RAM......3-2 Anritsu Power Sensors EEPROM....... . 3-2 EEPROM Contents .
Page 4 Identity [*IDN, OI] ........5-37 Contents-2 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 5 Source Sweep Graph ........6-16 Using an Anritsu Synthesizer ....... 6-16 6-12 Power vs.
Page 6 Using 488.2 GPIB ......... . . 8-6 Contents-4 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 7 Trigger ..........8-10 ML2437A/38A OM/PM PN: 10585-00001 Rev.
Page 8 CHCFG (Channel input configuration)......8-27 CHRES (Set channel decimal pint resolution) ....8-28 Contents-6 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 9 GRYB (Set graph Y-axis bottom scale) ..... . . 8-45 GRYT (Set graph Y-axis top scale) ......8-45 ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 10 OFFFIX Offset fixed value ....... . . 8-61 Contents-8 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 11 TRGARM (Trigger arming) ....... . . 8-79 ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 12 Output Format ......... . . 8-84 Contents-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 13 ZAJ (Zero the sensor) ........8-96 ML2437A/38A OM/PM PN: 10585-00001 Rev.
Page 14 Output Format ......... . 8-100 Contents-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 15 OS (Set offset value) ........8-115 ML2437A/38A OM/PM PN: 10585-00001 Rev.
Page 16 ZE (Zero sensors) ........8-120 Contents-14 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 17 ZE (Zero sensors) ........8-131 ML2437A/38A OM/PM PN: 10585-00001 Rev.
Page 18 HP438A Commands ........C-21 Contents-16 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 19 Cleaning Connectors ......... D-3 ML2437A/38A OM/PM PN: 10585-00001 Rev.
Page 20 Table of Contents (Continued) Contents-18 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 21: Chapter 1-General Information
10 ms. Available Options, Accessories, and Power Sensors Refer to the Anritsu Power Meters & Power Sensors Technical Data Sheet, PN: 11410-00423 for a complete listing of additional options and accessories, including power sensors available for the ML243xA power meters.
Page 22 Available Options, Accessories, and Power Sensors General Information PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 23: Chapter 2-Installation
Anritsu Customer Service Center. If either the shipping container is damaged or the cushioning material shows signs of stress, notify the carrier as well as Anritsu. Retain the shipping materials for the carrier's inspection.
Page 24: Battery Power
-20 C (-4 F) is possible. At these temperatures the liquid crystal display may exhibit excessively slow response. The soft sided carry case (part number D41310) and optional front panel cover (PN: 2000-1535) can be used to help retain internally generated heat and may improve response. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 25: Rack Mounting
However, the power meter can charge a well-maintained battery. 4. A battery should always be fully discharged before being re-charged. Fit the battery to the power meter and discharge the battery before charging. The battery charge level ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 26 Replace the battery with an identical battery or with an equivalent as recommended by an Anritsu Service Center. Ensure that the battery is correctly connected and that the battery compartment cover is securely fastened.
Page 27: Storage And Shipment
+122 F) for short periods and -20 C to +35 C (-4 F to +95 F) for long term storage. Preparing for Shipment Follow the procedure below if it is necessary to return the ML2437A/38A to Anritsu. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 28 RF connector on the front panel. 4. Seal the container carefully; use shipping tape or an industrial stapler. 5. Return the container to the appropriate Anritsu service center. The address of your local service center can be found at: https://www.anritsu.com/en-US/Contact-US/ PN: 10585-00001 Rev.
Page 29: Chapter 3-Memory And Security Considerations
Chapter 3 — Memory and Security Considerations Introduction The ML2437A/38A Power Meters have three different types of memory devices: Internal Flash Memory (8 MB EEPROM) This memory space is used to store the instrument firmware for the main processor and DSP factory calibration.
Page 30: Clearing The Non-Volatile Static Ram
System | Setup | more | Preset | Factory Anritsu Power Sensors EEPROM Anritsu manufactures several different families of sensors. All families have an EEPROM type of memory device in the power sensor. All A,B,C sensors (except MA2490/1A and MA2411B series sensors) These sensors all contain a 64 Kb (8 K x 8) EEPROM.
Page 31: Chapter 4-Connections
This connector is a 12-pin circular precision connector to be used in conjunction with power sensor cables. An optional rear panel Channel A connector is offered as an alternative (see figure overleaf). If the rear panel connector option is installed, the front panel connector is not installed. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 32: Sensor B Connector (Ml2438A Only)
Only MA2400A Series sensors can be connected directly to the ML243xA Power Meters. MA4700A and MA4600A Series sensors require the MA2499A or Note MA2499B Anritsu Sensor Adapter. MP-Series (10-pin) sensors require an MA4001A or MA4002B adapter and an MA2499B. Rear Panel Connectors The Rear Panel connectors are shown in the figure below.
Page 33 The ML243xA ID number is affixed to the rear panel here. Please use the complete ID number when ordering parts or corresponding with the Anritsu Customer Service department. AC Main Power 85-264 VAC, 47-440 Hz, 40 VA maximum. The power meter Input automatically configures itself for the voltage applied.
Page 34 21 V and all other functions are off. Fast-charge must be selected from the System menu. The external DC Power Supply input line is protected by an internal fuse. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 35: Chapter 5-Front Panel Operation
The ML243xA Power Meter is controlled from the front panel using the five main menu keys: Sensor, Channel, Trigger, System, and Cal/Zero. This chapter explains the power-on procedure and the features and functions of each of the menus. Refer to Appendix C for quick reference Menu Maps. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 36: Front Panel Controls
When External or Internal (battery) DC power is first applied to the instrument (no AC present) the power meter defaults to the STANDBY state. It can then be switched to the ON state using the front panel Power On /Off key. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 37: Power-On Procedure
Current store failed - current store reset Saved store(s) failed - failed store status changed to not saved WARNING - Secure mode clear memory - all non-vol stores reset Display Pass or Fail Keyboard Pass or Fail ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 38 Make a note of the hexadecimal error code displayed and contact your nearest Anritsu Service Center. Self test error messages are also available over the GPIB, as a self test status string (see STERR command in chapter 7).
Page 39: Sensor Menu
Fast CW. Fast CW can only be selected for sensors supplied with option 01. When measuring modulated signals with a diode sensor, ensure Modulated Note Average is selected or measurement errors may result. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 40: Calfactor
SENSOR Model ML2438A (dual channel) only. Select the sensor to be configured. Toggles between Sensor A and Sensor B for all submenu functions. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 41 V/GHz is supplied to the rear panel input connector of the ML243xA. The SETUP submenu has controls for customizing the voltage and frequency relationship. When the MA2499B Anritsu Sensor Adapter or the MA2497A HP Sensor Adapter are used, the input frequency should be set to 50 MHz irrespective of the Note measurement frequency.
Page 42 All frequency/cal factor data pairs can be deleted, but there must always be one data pair remaining. If there is a data pair at 50 MHz, this will be the data pair that will remain. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 43: Averaging
(e.g., signal sources). MOVING average allows the user to manually select the amount of averaging regardless of the signal level. The display is continually updated while averaging. When selected, the following soft key becomes available: ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 44 In Profile and Source sweep modes, the following soft keys appear: STATE [GRSWS] Graph averaging state, ON or OFF. When set to ON, the following additional soft keys appear: A NUMBER [GRSWP] B NUMBER (ML2438A only) [GRSWP] Sweep averaging number (1 to 512). 5-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 45: Offset
VALUE [OFFFIX OFFVAL] Enter the offset value (dB) when Offset TYPE is set to Fixed. Valid range is –99.99 to +99.99. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-11...
Page 46: Duty Cycle
If either sensor is held within an operation range, this key will force both sensors to Auto Range. Rng Hold is not available when System > Setup > mode is set to Source Sweep. In Note this mode, AUTO ranging is used. 5-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 47: Channel Menu
This is the sensor, combination of sensors, or rear panel BNC input that is used to calculate the measured and processed value for this channel. For the ML2437A (single input) power meter, the available options are A, External Volts, or OFF. For the ML2438A (dual input) power meter, the options are A, B, A –...
Page 48: Rel 1 [Rel]
If the display channel units are subsequently returned to the same units selected when the limit was entered or turned on, limit checking is turned on again. 5-14 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 49 OFF, or the CLEAR key (CLR) is pressed. The FAIL indication is not affected by the CLEAR key, and can only be cleared by turning FAIL HOLD off. If a limit fail happens again, the alarm will sound again. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-15...
Page 50: Trigger Menu
DEFAULT measurement mode, or if the peakmeter is displayed. When editing an entry in a menu, pressing the CLR key clears the digits. If in a Note menu screen, pressing the CLR key returns to the previous menu level. 5-16 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 51: Setup
Simultaneous trigger channels guarantee identical sampling for both channels, Note essential for accurate ratio (A/B) measurements. CHANNEL [TRGMODE] Select display channel 1 or 2 (or 1&2 when setting trigger conditions in Readout or Power vs. Time modes). ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-17...
Page 52 (but may yield a less-settled measurement). EDGE [TRGXTTL GTXTTL] When set to External TTL, the power meter triggers on a TTL level rising or falling. This selection sets the trigger for either a rising or falling edge. 5-18 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 53 INTA or INTB (internal sensor A or B) the channel triggers on a power level (in dBm) given by the sensor. This value must not take any cal factors or offsets that the meter applies into account. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-19...
Page 54 In Profile mode, this is the time between Cursor 1 and Cursor 2 and is used to provide the Between Cursor Average measurement. Display Trigger Delay (System > Profile > DELAY) is the delay after the trigger point. 5-20 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 55 “pretrigger information.” This is the best method for repetitive signals and can be used to verify signal repetition intervals. Note External trigger is only effective at 800 kHz or lower. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-21...
Page 56: System Menu
With LINK readout/profile trigger set to ON, switching to Readout mode uses the same trigger conditions, but allows the full dynamic range of the meter to be used, as well as providing full GPIB speed on data acquisition. 5-22 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 57: Profile
For the trigger to line up with the marked trigger point on repetitive waveforms, the delay period should be either zero, or set to integer multiples of 1/PRF (Pulse Repetition Frequency). Enter the delay period in ms or s. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-23...
Page 58: Power Vs. Time
DATA HOLD [GRPIX] Selects how the graph is displayed on the screen. Select from NORMAL, AVG, Min&Max, Min, or Max. TIME [GRDDT] Sets the data hold time, from 1 minute to 24 hours. 5-24 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 59: Source Sweep
Anritsu MG3690-series synthesizers provide both HORIZ OUT and SEQ SYNC Note OUT signals via the AUX I/O 25 pin D-connector using Anritsu cable part number 806-97. Refer to the signal source manual for rear panel connection details. ML2437A/38A OM/PM PN: 10585-00001 Rev.
Page 60: Control
When enabled through the System > Sound > CURSOR menu selection, if a cursor is moved into an illegal space such as the edge of the screen or the end of valid data (trigger point on the left of the screen) a warning beep will sound. 5-26 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 61 The readout provides display data depending on the graph mode and the data hold type selected, as shown below. ACTIVE CURSOR -10.61 -12.63 -0.00 8.85 AVERAGE READING -17.41 BETWEEN CURSORS Figure 5-6. Sample Readout Display ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-27...
Page 62 1 minimum reading, or maximum if MAX mode cursor 2 minimum reading, or maximum if MAX mode △ P Power diff between cursor 1 and cursor 2 minimums (or maximums if MAX mode) 5-28 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 63 Available in Profile, Source Sweep and Power vs. Time modes when the DATA HOLD representation selection is not set to NORMAL (or AVERAGE for Power vs. Time). Pressing the CLEAR key restarts the min/max collection. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-29...
Page 64: Display
Increases the display contrast. Adjust to suit ambient conditions. TIMED [DBLTIM] Sets the time limit when the backlight will turn off if the BACKLIGHT setting is set to TIMED. Enter a value from 0.0 to 100.0 minutes. 5-30 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 65: Sound
CURSOR CURSOR out of screen beep. If a cursor is moved into an illegal space, such as the edge of the screen or the end of valid data, a warning beep is sounded. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-31...
Page 66: Print [Print]
System Menu Front Panel Operation Print [PRINT] This selection prints the screen and various operational settings through the rear panel printer port. ANRITSU Power Meter ML2437A s/n: 97180010 Firmware: 2.02 Sensor A: NOT FITTED Sensor Measurement Setup Measurement mode Default Cal factor Frequency (50.00MHz)
Page 67: Rear Panel
BUFFER Enabled TRUE is the default. Use FALSE when programming simple Note command sequences to read data and you do not want to bother with decoding status or keeping track of multiple results or readings. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-33...
Page 68 Source IF allows the power meter to communicate with an Anritsu synthesizer when the operation mode is set to Source Sweep. BAUD [RSBAUD] Sets the serial port BAUD rate.
Page 69 (port 1 only) is a TTL signal synchronized to the internal chopper (when used) of the signal channel. This signal can be used for synchronization with external sources or when viewing AC range (chopped) signals. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-35...
Page 70: Graphics
This menu presents additional graphic display controls: CONNECT [GRCP] This control is normally ON and causes the data between samples to be interpolated and lines drawn between sample points. When OFF, the sample points only are displayed as pixels. 5-36 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 71: Secure [Secure]
Clear memory, the system will load the presets (see Appendix A, Section A-3) every time it is turned on. Identity [*IDN, OI] This selection will display the installed firmware version, the instrument serial number, and the instrument type (model number). ML2437A/38A OM/PM PN: 10585-00001 Rev. P 5-37...
Page 72: Cal/Zero Menu
This calibration is non-volatile and does not normally need to be performed. In the case of offsets being introduced by the user’s setup, it is possible to leave the BNC cable connected to zero out system offsets, however the offset zero range is limited to approximately 100 mV. 5-38 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 73: Chapter 6-Procedures
To zero the sensor without calibration, press the Cal/Zero front panel key and the Zero soft key, then select the appropriate sensor. Note that if only one sensor is connected, the A-B selection is not displayed and the zeroing process begins immediately. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 74: Sensor Calibration
Press the Cal/Zero front panel key and the Zero/Cal function key, then select the appropriate sensor. The message changes to SENSOR x ZERO. Note that the power meter automatically switches the reference calibrator OFF during the zeroing operation. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 75: Performance Verification
Operation”). Performance Verification The performance of the power meter’s individual signal channel inputs can be verified using an Anritsu Range Calibrator. Contact your Anritsu Customer Service representative for more information. Printer Connection See Chapter 3, Connectors, for the location of the parallel port connector on the rear panel.
Page 76: Serial Remote Operation
While most standard serial cables will suffice, a 9-pin null-modem serial interface cable is available from Anritsu as an optional accessory (part number 2000-1544). Note that the hardware handshake CTS and RTS lines are used to control the flow of data in and out of the power meter and must be available in the cable as hardware handshaking is always enabled.
Page 77: Rs232 Modem Support
When an autodial sequence is initiated, different sets of characters will be seen on the remote PC depending on what is connected to the power meter serial port. Serial interface remote operation is not available when the ML243xA Series Power Note Meter is operating from the internal battery. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 78 Refer to the System Menu explanation in chapter 4 for information on using the front panel menus to configure modem operation. Refer to Native GPIB Commands in chapter 6, for information on using GPIB commands to configure modem operation. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 79 There might be additional information after “CONNECT” but before the line termination characters. 3. The remote computer is now connected to the power meter. The power meter can now be asked to identify itself: *IDN?\n ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 80 To determine what has caused the SRQ, the status register in the power meter must be read. The status register in the meter is an 8-bit register. There are two ways to do this. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 81 (limits failure or sensor range error) should be disabled to prevent any unnecessary autodial attempts by the meter when already connected to a remote PC. To clear the status register, use the command: *CLS\n ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 82: 6-10 Profile Operation Mode
A typical situation with no triggering (CONTINUOUS): 1. Select SYSTEM > SETUP > PRESET to reset the instrument to the standard default conditions (see Appendix B for a listing of the system defaults). 6-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 83: Scaling
To link the cursors, select SYSTEM > CONTROL > more > more > LINK CURSR. When the cursors are linked, a line is drawn on the display connecting the two cursors and they will move together as one. This is discussed more fully in the Triggered Measurements section below. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-11...
Page 84: Triggered Measurements
This is Note generally true for x-axis times of less than 6 ms where it takes more than one pass to completely update the display. 6-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 85: Control Of X-Axis - Width Of Profile - Sample Time
4. As well as the CURSOR readouts described above, the POWER AVERAGE method can be used to display the average power between the two cursors. This is performed as a TRUE AVERAGE and is the actual average of all the data points between and ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-13...
Page 86: Advanced Triggering And Setup Options
MIN readout if or when it sees a lower value than that which it has already. This option, in the SYSTEM menu, is only a preferences option and not the main control for the feature. 6-14 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 87: Source Sweep Mode
0 and 10V, and the start and stop power settings are taken from the System > Source sweep menu. Make sure the Sensor > CalFactor > SOURCE is set to Frequency or Manual. In power sweep mode V/GHZ is not used. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-15...
Page 88: Source Sweep Graph
Using an Anritsu Synthesizer The ML243xA can be connected directly to the Anritsu MG3690- and 68/69000-Series Synthesized Signal Generators using a special RS232 cable (Anritsu part number C37399). To use this remote connection, the System > Setup mode must be set to Source sweep, and the System >...
Page 89: 6-12 Power Vs. Time Mode
691x5A - 1.24, 692x5A - 1.24, 693x5A - 1.31 Contact your nearest Anritsu Service Center for a firmware upgrade if necessary. 6-12 Power vs. Time Mode The ML243xA Power vs. Time mode is a graphical chart display of one of the display channels, as selected in the SYSTEM >...
Page 90: Example Procedure
At any time, if anything other than the factory supplied cal data is applied, the Status box display shows a warning ‘*’ sign on the Cal Factor line to show that non-standard calibration is being applied. For example: 6-18 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 91: 6-14 Optimizing Readings
Using the default system set up (system preset), the “O 1” command is used to retrieve one reading from channel 1 ten times (channel 1 = Sensor A). ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-19...
Page 92: Disp On/Off Command
Power Level (dBm) Readings/s 10.0 The 0.1 % settling on –30 dBm power level results were not improved because of the amount of time needed to settle to 0.1 % on –30 dBm. 6-20 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 93: Fast On/Off Command
Using FAST mode here will not increase the speed as this mode only works when Note asking for one measurement at a time (i.e., the ‘O’ command only.) ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-21...
Page 94: Changing Measurement Modes
Send(0, 13, “*RST; FAST ON; SENMM A, CUSTOM; TRGGW 1 ms”, 51L, NLend); Receivesetup(0,13); /* Fast mode, therefore do not send ‘O 1’ for data, just read.*/ for(i=0; i<10; i++) RcvRespMsg(0,buffer,STOPend); Table 6-9. Power Levels and Reading per Second Power Level (dBm) Readings/s –30 6-22 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 95: An Example Program In C
Send(0, 13, “*RST; FAST ON”, 13L, NLend); /* Loop 10 times and store readings */ for(i=0; i<10; i++) Receive(0, 13, buffer[i], 20, STOPend); /* display readings.. */ for(i=0; i<10; i++) printf(“Reading %i = %s”, i+1, buffer[i]); ML2437A/38A OM/PM PN: 10585-00001 Rev. P 6-23...
Page 96: 6-15 Operator Maintenance
2. Double click on zip file icon. This will extract all files to the current directory. 3. Connect PC com port 1 or 2 to power meter using Null modem cable (Anritsu p/n 2000-1544). As a minimum you need TX & RX (pins 2 & 3) swapped and RTS & CTS (pins 7 &...
Page 97: Chapter 7-Measurement Examples
20 dB of its dynamic range. Anritsu recommends that during Zeroing, the sensor is connected to the device under test having ensured it is not emitting any power (see 5. Connections). If this is not possible, then the sensor should be zeroed to the CALIBRATOR socket on the ML2430A front panel.
Page 98 See the appendix for a table of power sensor model numbers, power and frequency ranges. Anritsu do not recommend the use of adapters between the power source and the sensor since this can introduce measurement errors. 6. Applying a calibration factor The accuracy of a measurement is affected by the frequency response of the individual sensor.
Page 99 Changing the way measurement units and decimal resolution are displayed on the screen. The default setting for the ML2430A is to display units in dB[m] and resolution to two decimal places. To change this, press [Channel] [Setup]. > ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 100 You may have a requirement to track a device’s highest and lowest power measurements over time. Press [Channel] [Setup]. > The Channel Set Up screen is displayed. Press [-more-] to display further soft keys. Press [MIN/MAX]. The display changes to: Figure 7-7. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 101 Offset from Table: Tables enable an offset to be applied that is frequency dependent. The table must be entered into the memory of the meter before it can be applied. See the Miscellaneous Features section of this guide for further information. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 102 This setting is automatically set to ON when an upper test value is entered. Toggle the setting on or off. [LOW State] This setting is automatically set to ON when a lower test value is entered. Toggle the setting on or off. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 103 2 seconds. This will then replace the stored absolute value with the current measurement. To check the absolute value, press [Rel 1] once. To re-define the absolute value, press [Rel 1] for approximately 2 seconds. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 104: Example 2: Measuring Modulated Carrier
This is because the diode is not detecting in its square law region. A special feature of the Anritsu diode sensors and power meters is the ability to correctly measure amplitude modulated carriers with average powers greater than –25 dBm.
Page 105: Example 3: Optimizing Measurements At Low Power Levels
Example 3: Optimizing Measurements at Low Power Levels When measuring power levels in the bottom 20 dB of a sensor’s dynamic range, Anritsu recommends that prior to the measurement, you perform a Zero. If possible, this should be done with the sensor connected to the device under test (having first ensured it is not emitting any power).
Page 106 Figure 7-16. To change this setting to MEDIUM (+ 0.02 dB), HIGH (+ 0.05 dB) or to turn it OFF, press [LOW LEVEL]. Figure 7-17. Typical display for measurement of low power levels. 7-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 107: Example 4: Using Both Channels
BNC input) that will be used. This will vary depending on the model of power meter you are using. To allocate an input for channel 2, press [INPUT]. Toggle the setting until the input type you require is displayed. Table 7-1. Input options for the ML2437A Input Meaning...
Page 108 Min/Max etc. make sure that you are effecting the changes on the correct channel. Change from channel 1 to channel 2 by using the [CHANNEL] soft key. A preset will return the power meter back to its default setting i.e. one channel only. 7-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 109: Example 5: Using Two Sensors
An offset has been applied to compensate for the coupling factor of the through line coupler. In this example, sensor A is allocated to channel 1 and sensor B is allocated to channel 2. This allocation can be changed as shown in Example 4. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-13...
Page 110 Additional soft keys are included in the Cal/Zero Menu options — [Sensor A] and [Sensor B]. Select as appropriate. After a Preset, channel 1 is allocated to sensor A and channel 2 is inactive. 7-14 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 111: Example 6: Gain Compression Measurement
(Note a signal splitter has a nominal path loss of 6 dB.) We can display the gain of the amplifier directly if we set channel 1 to A/B (see Example 4). Press [Channel] [Setup] [Input]. > > ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-15...
Page 112 Increase the power of the signal source until the display reads –1.00 dBr. The amplifier is now at its 1 dB compression point. Input and output powers at 1 dB compression can be viewed as before. Figure 7-25. 7-16 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 113: Example 7: Measuring Pulse Signals With A Duty Cycle
When measuring duty cycles with long pulse repetition frequencies, it may be necessary to apply the Modulated Average mode (see Example 2, Measuring Modulated Carrier). Press [Sensor] [Setup] [MODE]. > > Toggle this setting until Mod Average is displayed. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-17...
Page 114 The following screen is displayed: Figure 7-28. Note that box A in the top right hand corner of the screen now indicates that a Duty Note Cycle percentage has been applied to the Sensor. 7-18 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 115: Example 8: Profiling Pulse Signals
Data collection period is the length of time for which data is captured. It also defines the time axis settings. 1. Changing from Readout to Profile mode Press [System] [Setup]. > The following screen is displayed: Figure 7-30. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-19...
Page 116 To set the trigger for a falling edge, press [-more-] [TYPE] and toggle this setting until > "Fall (Int A)" is displayed. Press [LEVEL] if you wish to change from the default trigger level of –15 dB. 7-20 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 117 [Profile] [Delay] > > and using the keypad, input a delay of 9.5 ms. Press [Enter] to accept the value. The Measurement screen now shows activity prior to the trigger point. Figure 7-33. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-21...
Page 118 Press [LINK] and toggle this setting until "ON" is displayed. To return to readout mode, press [-back-] [MODE]. Toggle this setting until "Readout" is shown. To display > the resulting screen, press any hard key. Figure 7-34. 7-22 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 119: Example 9: Displaying Gsm-Tdma Bursts
Int B Take trigger from sensor B (ML2438A only) EXTTTL Take trigger from an external source MANUAL User triggers measurement from front panel soft key CONTINUOUS Automatic continuous trigger on completion of measurement cycle ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-23...
Page 120 > > > Press [TOP] and/or [BOTTOM] to set the dB values as required. Press [Enter] to accept the values. Alternatively, rather than entering top and bottom values, you can select [AUTO SCALE]. 7-24 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 121 If the cursors are now moved using [<<] or [>>], they move as a pair. 6. Displaying the Readout box This box can be toggled on and off by pressing [System] [Control] [-more-] > > > [READOUT]. 7. Displaying the average power in readout mode ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-25...
Page 122 Press [LINK] and toggle this setting until "ON" is displayed. To return to readout mode, press [-back-] [MODE]. Toggle this setting until "Readout" > is shown. To display the resulting screen, press any hard key. Figure 7-39. 7-26 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 123: 7-10 Example 10: Power Versus Time Data Logging
Alternatively, rather than entering top and bottom values, you can select [AUTO SCALE]. 2. Selecting the data hold representation The data hold representation allows you to specify how you would like these measurements displayed on the screen. Press [System] [PwrVsTime]. > ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-27...
Page 124 Normal: This is the default setting and returns the last measurement taken within each block of time. Figure 7-42. Average: This looks at all the measurements within the block of time and returns the average power. Figure 7-43. 7-28 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 125 2 p the power difference between cursors 1 and 2 t the time difference between cursors 1 and 2  the time at cursor 1 the time at cursor 2 ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-29...
Page 126 If the cursors are now moved using [<<] or [>>], they move as a pair. 4. Displaying the Readout box This box can be toggled on and off by pressing [System] [Control] [-more-] > > > [READOUT]. 7-30 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 127: Example 11: Frequency Measurements Using A Separate Source
Prior to starting this type of measurement, it is necessary to connect the power meter to the signal source using BNC cables. Figure 7-46. SIgnal Source (Rear Panel) Anritsu 68000 or 69000 Series 2. Selecting Source Sweep mode and defining frequencies.
Page 128 Press [Sensor] [Cal Factor]. > Press [SOURCE] and toggle the setting by repeatedly pressing the soft key until the V/GHz is displayed. To display the Measurement screen, press any hard key. Figure 7-49. 7-32 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 129 To measure the power difference between the cursors, link them first. Press [System] > [Control] > [-more-] > [-more-] > [LINK CURSR]. If the cursors are now moved using [<<] or [>>], they move as a pair. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 7-33...
Page 130 Example 11: Frequency Measurements Using a Separate Source Measurement Examples 7-34 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 131: Chapter 8-Gpib Operation
The table below lists the numeric data suffix mnemonics for the ML243xA Power Meter. These mnemonics are used when entering numeric data with GPIB commands (use of these codes is optional). ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 132: Nr1
This notation represents ASCII floating point values in decimal point format. A comma (,) is used to separate multiple values sent in a single command's input or output string. Examples of values that can be represented by <NR2> notation: –0.00015 12.743, –180.07 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 133: Nr3
Example of data represented by <Arbitrary ASCII> notation: Anritsu,MA2410A,123456,1.0<0A^EOI> The example shows a sample response from the *IDN?, 488.2 common query. In the example, the instrument identifies itself as an Anritsu MA2410A, with serial number 123456, and software version 1.0 installed. Note that decimal 10 (0Ah character) must be sent with the EOI to signal end of transmission.
Page 134: Query Commands
Type of compare on EOS 8 bit EOS byte 0x0A (10 decimal) Send EOI at end of write System controller Assert REN when SC Enable Auto Serial polling NI card. Cable length for HS488 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 135: Using 488.1 Gpib
Typical device library calls are 488.1 'ibconfig' plus correct option and 488.2 'SendLLO'. Serial poll This command will clear any SRQs and read the status byte of the device. Typical device library calls are 488.1 'ibrsp' and 488.2 'ReadStatusByte'. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 136: Using 488.2 Gpib
Device Dependent Error. The specific error can be found by using the ERRLST command. Query Error. Request Control. GPIB controllers only. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 137: Message Available Bit (Mav)
The data should now be read so that the MAV bit will be cleared. If the data is not read, or the output buffer not cleared, and another request for data is made this data will be buffered after the previous data. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 138: Getting A Reading
ESB bit in the status byte will be set. This bit can be used to set an SRQ by setting the same bit in the SRE register using the *SRE command. The ESB bit is cleared when the ESR is read by using the *ESR? Command. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 139: Functional Groups
Commands in this group are used to configure GPIB triggering and setup the GPIB Group Execute Trigger (GET) and TR commands (TR0, TR1, TR2, TR3). Note that these commands are exclusive to GPIB, and do not have equivalent front panel operations. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 140: Profile Setup
Changes to the trigger configurations can be made using these GPIB commands regardless of the power meter operating mode, but will not come into play until the unit is configured to use triggers. 8-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 141: Ml24Xxa Native Commands
*CLS Remarks: This command performs a status data structure clear command. The event status register and the status register are cleared except for the MAV bit. *CLS does not clear the output buffer. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-11...
Page 142: Ese (Event Status Byte Enable)
All other bits are not used. The bits above are 488.2 common bits. The ERRLST command will return an error list giving the state of the DDE causes. Related *ESR?, *ESE?, ERRLST commands: 8-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 143 GPIB Operation ML24xxA Native Commands Figure 8-2. IEEE 488.2 Standard Status Structures ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-13...
Page 144: Ese? (Return Event Status Register Enable Mask)
Example: RGH A, 1; RGH B, 2; *OPC? Returns a ‘1’ on the GPIB output when it has finished setting the range hold commands. 8-14 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 145: Rcl (Recall A Stored Setup)
Sensor Setup, Channel Setup, and Trigger Setup are saved along with all other instrument parameters. Related *RCL commands: *SRE (Setup service request enable register) Syntax: *SRE <val> val: 8-bit mask Remarks: Sets the Service request enable register bits. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-15...
Page 146: Sre? (Return Service Request Enable Register)
GT0, GT1, GT2 commands: *TST? (Self Test) Syntax: *TST? Remarks: Performs a self test and returns 'SUCCESS' or 'FAILED.' NOTE: This command will restart the sweep in Power vs. Time mode. Related STERR commands: 8-16 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 147: Addr (Change Gpib Address)
1 to 30 Remarks: Once the address has been changed, the ML243xA will no longer respond to the old address. The power meter default address is 13. Query: ADDR? Returned String: ADDR <val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-17...
Page 148: Avg (Sets Up Averaging For A Sensor)
Number <val> (1 to 512) without changing the averaging mode, but there must be a COMMA to indicate the <mode> parameter is not being sent. See the last example below. Query: AVG? <S> Returned String: AVG <S>,<MODE>,<VAL> 8-18 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 149: Avgll (Auto Low Level Averaging)
'Auto' Averaging. The average number is set to the same value that the 'Auto' averaging mode was using internally. If the sensor is not presently in auto averaging mode, this command is ignored. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-19...
Page 150: Bauts (Battery Auto Turn Off)
Note: If the buffering enabled is set to OFF and '*OPC?' is used, the '*OPC?' will clear the output buffer of any previous response data so only the '1' will appear. 8-20 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 151: Cal (Cal Sensor To 0 Dbm Reference)
CFCAL A, %, 99 Sets the calibration factor to 99% for sensor A. CFCAL A, DB, 0.2 Sets the calibration factor to .2 dB for sensor A. Query: CFCAL? <s> Returned String: CFCAL <s>,<units>,<val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-21...
Page 152: Cffrq (Cal Factor Frequency Value)
VGHz takes the frequency from the V/GHz input and uses it to look up the calibration factor from the EEPROM in the sensor. Related CFVAL commands: Query: CFSRC? <s> Returned String: CFSRC <s>,<source> 8-22 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 153: Cfuadd (Add An Entry Pair To A Cal Factor Table)
1 to number of tables supported by the sensor type Remarks: Clears the cal factor table to one entry for 50 MHz at 100%, but does not clear the identity of the table. The cleared table is automatically saved to the sensor. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-23...
Page 154: Cfuid (Cal Factor Table Identity Update)
Length of message in bytes binary data: Same data as that received by CFURD Remarks: Loads binary data into the cal factor table. This command will automatically save the data to the sensor. 8-24 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 155: Cfupt (Preset Cal Factor Table)
Processing may take a couple of seconds. Any command that can select a new sensor and/or cal factor table for changing, will not automatically save any previous changes made. It is the users responsibility to issue a CFUSAV command. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-25...
Page 156: Cfusel (Select Cal Factor Table)
1 to number of tables supported by the sensor type Remarks: Returns a TRUE if the table number passed is a valid initialized table for the selected sensor. Returns a FALSE if it is not. 8-26 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 157: Cfval Current Cal Factor Value
A–B, B–A = Sensor A minus Sensor B, Sensor B minus Sensor A A/B, B/A = Sensor A divided by Sensor B, Sensor B divided by Sensor A Example: To set channel 2 to A–B: CHCFG 1,A-B Query: CHCFG? <c> Returned String: CHCFG <c>,<config> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-27...
Page 158: Chres (Set Channel Decimal Pint Resolution)
CONT (Continue) Syntax: CONT Remarks: This command will allow the system to continue the startup sequence if there are self test failures other than DSP errors. Related STERR, START commands: 8-28 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 159: Cur (Cursor In Power Vs. Time And Source Sweep Modes)
Links the two cursors together on the graph. When either cursor moves left or right, the other cursor follows. Subsequent changes to delay will move both cursors. Query: CURLK? Returned String: CURLK <state> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-29...
Page 160: Cvspf (V/Ghz Calibration Factor Stop Frequency)
A or B val: 10 kHz to 122 GHz Remarks: Sets the start frequency of the V/GHz calibration factor settings. Related CVSPV, CVSPF, CVSTV commands: Query: CVSTF? <s> Returned String: CVSTF <s>,<val> 8-30 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 161: Cvstv (V/Ghz Calibration Factor Start Voltage)
TIMED. Note: Although GPIB is not available under battery operation, the state of this battery-specific parameter can be changed through this GPIB command. Related DBLTIM? commands: Returned String: DBLTIM <val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-31...
Page 162: Dcont (Set Display Contrast)
1. Min max values read via the GPIB are not updated. 2. Relative operation is ignored so that the normal value is given. 3. DISP will not operate when sent via RS232. Query: DISP? Returned String: DISP <state> 8-32 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 163: Dtrgd (Display Trigger Delay)
Remarks: The delay time from the trigger point to when the profile starts to be drawn. Example: DTRGD 1.25MS Sets the display trigger delay to 1.25 ms. Query: DTRGD? Returned String: DTRGD <val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-33...
Page 164: Duty (Duty Cycle)
Syntax: DUTYS <s>,<state> s: A or B state: ON or OFF Remarks: Turns on or off the duty cycle for the selected sensor. Related DUTY commands: Query: DUTYS? <s> Returned String: DUTYS <s>,<state> 8-34 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 165: Emul (Gpib Emulation Mode)
GPIB Operation ML24xxA Native Commands EMUL (GPIB emulation mode) Syntax: EMUL <mode> mode: ML24XX (Anritsu ML243xA native mode) HP436A (Hewlett-Packard) HP437B (Hewlett-Packard) HP438A (Hewlett-Packard) ML4803 (Anritsu ML4803A Series) Remarks: Set the GPIB emulation to emulate other types of power meters. This command is available in any emulation mode, and resets the whole GPIB interface when the emulation mode is changed.
Page 166: Errlst (Returns The Dde Error List)
O = Display channel 2 limits state: 0 - Passed, 1 - High limit failed, 2 - Low limit failed. PPPPPP = Last cause of a GPIB command error QQQQQQ = Last cause of a GPIB execution error. 8-36 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 167: Fast (Operate In Non-488.2 Compliant Mode)
FAST mode, except for serial poll. FAST mode must be turned off, for example, to ask for the identity data. h. FAST mode will not operate when sent via RS232. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-37...
Page 168: Fhold (Fail Indicator Hold)
All BNC outputs, beeps and displays continue to be in the 'fail' state until after the OFF is received. Related FBEEP commands: Query: FHOLD? <c> Returned String: FHOLD <c>,<state> 8-38 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 169: Frst (Factory Reset)
GMNMX (Return the minimum and maximum values) Syntax: GMNMX <c> c: 1 or 2 Remarks: When min/max tracking is turned on, this command is used to read the values. The format returned is: <min_value>,<max_value> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-39...
Page 170: Gprst (Reset Min/Max Graph)
Syntax: GRCP <state> state: ON or OFF Remarks: When set to ON, creates a line graph by connecting the profile data points together. The default is ON. Query: GRCP? Returned String: GRCP <state> 8-40 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 171: Grdata (Display Graph Cursor Data)
Sets the time period of the x axis in minutes or hours. For example, either of the following statements may be used to set the time period to 2.5 hours: GRDDT 2.5,HR GRDDT 150,MIN Query: GRDDT? Returned String: GRDDT <time>,<units> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-41...
Page 172: Grdrq (Return Graph Data Readout)
GRMD (Profile, Power vs. Time and Source Sweep Selection) Syntax: GRMD <c> c: 1 or 2 Remarks: Selects the channel displayed on the Profile, Power vs. Time and Source Sweep graphs. Query: GRMD? Returned String: GRMD <c> 8-42 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 173: Grpix (Profile Type)
Sets the pre trigger percentage of the profile screen. The percentage of the data collection period that shows pretrigger information if the display trigger delay is 1/PRF. Query: GRPTP? Returned String: GRPTP <val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-43...
Page 174: Grswp (Graph Averaging Number For Profile Or Source Sweep)
GRSWS (Graph Average State for Profile or Source Sweep) Syntax: GRSWS <state> state: ON or OFF Remarks: Turns Graph Averaging on or off. Related GRSWP, GRSWR commands: Query: GRSWS? Returned String: GRSWS <state> 8-44 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 175: Grtmm (Profile Min/Max Tracking Mode)
It is not necessary to specify units as the displayed units are always assumed. Profile and Source Sweep modes always use dBm, but Power vs. Time mode can also use dBmV or dBmV. Query: GRYT? Returned String: GRYT <val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-45...
Page 176: Gt0 (Set To Ignore The Group Execute Trigger (Get) Command)
BNC sweep blanking input is TRUE before it starts to trigger. If set to OFF, the system triggers on whatever trigger source it has been set up for. Related GTARM? commands: Returned String: GTARM <state> Query: 8-46 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 177: Gtdly (Set Profile Trigger Sample Delay)
When the system trigger in profile mode is set to either INTA or INTB (internal sensor A or B) it will trigger on a power level given by the sensor. This command sets the level. Related GTSRC, GTTYP commands: Query: GTLVL? Returned String: GTLVL <val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-47...
Page 178: Gtsrc (Set Profile Trigger Source)
A or B) the ML243xA triggers on a power level (GTLVL) rising or falling. This command sets the trigger for a rising or falling edge. Related GTLVL, GTSRC commands: Query: GTTYP? Returned String: GTTYP <type> 8-48 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 179: Gtxttl (Set Profile External Trigger Edge)
DISPLAYED value is higher than –10. Limit checking only uses the displayed value and does not change its value even though the display units have changed. Related HLIMS commands: Query: HLIM? <c> Returned String: HLIM <c>,<val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-49...
Page 180: Hlim (Set High Limits)
Syntax: IBBLP <polarity> polarity: POS (positive, for high TTL level) NEG (negative, for low TTL level) Remarks: Changes the expected polarity of the TTL Blanking input signal. Query: IBBLP? Returned String: IBBLP <polarity> 8-50 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 181: Keyck (Turn Key Click Sound On Or Off)
A change to the trigger set-up in either Readout or Profile system set-up will affect either display mode. Query: LINK? Returned String: LINK <state> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-51...
Page 182: Llims (Turn On/Off Low Limits)
LLIMS (Turn on/off low limits) Syntax: LLIMS <c>,<state> c: 1 or 2 state: ON or OFF Remarks: The LLIMS command turns the limits on and off. Related LLIM commands: Query: LLIMS? <c> Returned String: LLIMS <c>,<state> 8-52 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 183: Mmrst (Min Max Tracking Reset)
Available in graph modes only. Outputs in ASCII form the min graph data. The format is as follows: MNGD <number_of_elements>,<element_1>,<element_2>,<element_n>...<\n> The first number in the string is the number of elements to follow, and is always 200 for the ML243xA. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-53...
Page 184: Mnmxs (Track Min And Max Values)
When set to TRUE, produces an SRQ and autodials the phone number (set with MODPH) when a channel limits failure occurs. See Section 5-10 for more information on modem operation. Query: MODLIM? Returned String: MODLIM <true> or <false> 8-54 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 185: Modph (Autodial Phone Number)
Sets the number of retrys after a failure to connect. The delay between retrys is set using MODDEL. See Section 5-10 for more information on modem operation. Query: MODRED? Returned String: MODRED <count> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-55...
Page 186: Modrng (Autodial Enable For Range Error)
Available in graph modes only. Outputs in ASCII form the max graph data. The format is as follows: GD<number_of_elements>,<element_1>,<element_2>,<element_n>...<\ n> The first number in the string is the number of elements to follow, and is always 200 for the ML243xA. 8-56 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 187: O (Return Display Channel Reading)
This command changes the channel represented by BNC output modes that can take data from either channel 1 or 2, such as “Analog Output” and “Pass/Fail” modes. Query: OBCH? <port> Returned String: OBCH <port>,<c> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-57...
Page 188: Obdsp (Bnc Analog Output Display Stop Value)
0 to 1 kW -70 to 47dB -23 to 94 dBmV 37 to 154 dBmV Remarks: Sets up the start value for the analog out scale of the display. Query: OBDST? <port> Returned String: OBDST <port>,<units>,<val> 8-58 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 189: Obmd (Bnc Output Mode Select)
1 or 2 level: HIGH (TTL high is PASS) LOW (TTL low is PASS) Remarks: Selects the PASS level for the Pass/fail type of output. Query: OBPL? <port> Returned String: OBPL <port>,<level> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-59...
Page 190: Obvsp (Bnc Analog Output Stop Voltage Scale)
Query: OBZL? Returned String: OBZL <level> OFFCLR (Clear an offset table) Syntax: OFFCLR <val> val: 1 to 5 Remarks: Sets all the values in the table specified to 0 dB and 0.00 Hz. 8-60 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 191: Offfix Offset Fixed Value
The frequency comparisons start from the beginning of the table; if the entry is 0 Hz, this is counted as the end of the table. Query: OFFTBL? <s> Returned String: OFFTBL <s>,<val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-61...
Page 192: Offtbu (Updates An Offset Table)
The four byte value can be created by multiplying the floating point number by 1024 and converting the LONG number to an ASCII string. For example: -10.234 becomes 10479, converted to hexadecimal FFFFD711. See the programming examples for more detail. 8-62 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 193: Offtyp (Offset Type To Use)
<data_byte_n> four of these values makes up the long integer. For example: FF FF D1 64 = –11932 As it is based on 1024 per dB, divide by 1024 to get the dB value (–11.652). ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-63...
Page 194: Ogd (Output Graph Data)
'HOLD OFF' after. This will make sure that the sample data and the graph data agree. If not in Power vs. Time mode, this command will set an execution error. OI (Output device identification) Syntax: Remarks: Returned format: <Company name>,<model>,<serial>,<firmware version> 8-64 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 195: On (Output Number Of Channel Readings)
To use Graph output commands, the ML243xA must be in Profile or Power vs. Time mode. To use the output channel data commands, the ML243xA must be in the digital readout mode. Related GRMD commands: Query: OPMD? Returned String: OPMD <mode> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-65...
Page 196: Print (Send Details To The Connected Printer.)
RCD <s> s: A or B Remarks: Returns the results from an Anritsu Range Calibrator run after the Range Calibrator is disconnected from the power meter. While still connected to the Range Calibrator, the results can be printed but not read via GPIB.
Page 197: Rel (Relative Control)
AUTO. If RGH is sent with sensor and value parameters, the sensor range mode will be set to the range value sent. Query: RGH? <s> Returned String: RGH <s>,<val> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-67...
Page 198: Rsbaud (Rs232 Baud Rate)
As long as this command is ON, the system will load the presets (see Appendix B) every time it is turned ON. Query: SECURE? Returned String: SECURE <s> 8-68 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 199: Senmm (Sensor Measurement Mode)
Selects between using a universal power sensor in its normal operating mode (TRMS) and its option 1 mode (FCW). FCW can only be selected if this option is fitted in the power sensor. Query: SENMO? <s> Returned String: SENMO <s>,<value> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-69...
Page 200: Senstl (Set Sensor Settle Percentage)
Returned String: SRCMOD <mode> SRCSPFRQ (Source Sweep Stop Frequency) Syntax: SRCSPFRQ <freq_value>[units] freq value: 10 kHz to 122 GHz Remarks: Determines the stop frequency when in frequency sweep mode. Query: SRCSPFRQ? Returned String: SRCSPFRQ <frequency> 8-70 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 201: Srcsppwr (Source Sweep Stop Power)
Query: SRCSTFRQ? Returned String: SRCSTFRQ <frequency> SRCSTPWR (Source Sweep Start Power) Syntax: SRCSTPWR <power_value> power value: power Remarks: Determines the start power level of power sweep mode. Query: SRCSTPWR? Returned String: SRCSTPWR <power> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-71...
Page 202: Start (Initial Startup Self Test Command)
In this stage of the startup process, all commands except STERR, START, CONT and GPIB 488.2 event and status commands will produce a GPIB execution error. STERR will return the selftest result string. Related STERR, CONT commands: 8-72 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 203: Status (Status Message)
RRRR = Sensor A average number. For Profile and Source Sweep modes, this number is between 1 and 512. For digital Readout or Power vs. Time modes, the values are either 1 to 512 or, if in AUTO averaging mode, 513 to 1024. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-73...
Page 204 ML24xxA Native Commands GPIB Operation SSSS = Sensor B average number (0000 if ML2437A). For Profile and Source Sweep modes, this number is between 1 and 512. For digital Readout or Power vs. Time modes, the values are either 1 to 512 or, if in AUTO averaging mode, 513 to 1024.
Page 205: Sterr (Returns Results Of Post Or *Tst?)
Saved data previously read from the meter using the SYSRD command Remarks: Sets the passed store number to the setup contained in the binary data that was extracted using the SYSRD command. Related SYSRD commands: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-75...
Page 206: Syslnm (Saved Set Naming)
<num_digits> = Number of following digits giving the number of bytes of binary data. <number num_digits long> = A number num_digits long giving the number of bytes of binary data. <binary data> = Saved setup. Related SYSLD commands: 8-76 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 207: Text (User Text Command)
TR0 command was sent. If the REM line is low, this command has no effect. Related TR1, TR2, TR3, *TRG, Group Execute Trigger (GET), GT0, GT1, GT2 commands: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-77...
Page 208: Tr1 (Trigger Immediate)
After a TR2 command the instrument returns to either TR0 (trigger hold) or TR3 (trigger free run) mode depending on what it was previously set to. Related TR0, TR1, TR3, *TRG, Group Execute Trigger (GET), GT0, GT1, GT2 commands: 8-78 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 209: Tr3 Trigger Free Run
ON. This depends on the settings of the “link triggers” flag and the current mode of the sensor on the selected channel. If the channel is OFF, the stored trigger state of the channel is returned. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-79...
Page 210: Trgdly (Trigger Sample Delay)
ON. This depends on the settings of the “link triggers” flag and the current mode of the sensor on the selected channel. If the channel is OFF, the stored trigger state of the channel is returned. 8-80 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 211: Trglvl (Set Trigger Level)
CUSTOM measurement mode, the COMBined trigger mode is not allowed, and sending the GPIB command TRGMODE COMB will produce an execution error. Query: TRGMODE? Returned String: TRGMODE <mode> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-81...
Page 212: Trgsrc (Set Trigger Source)
ON. This depends on the settings of the “link triggers” flag and the current mode of the sensor on the selected channel. If the channel is OFF, the stored trigger state of the channel is returned. 8-82 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 213: Trgxttl (Set External Trigger Edge Type)
ZERO (Zero the selected sensor) Syntax: ZERO <s> s: A or B Remarks: Zero out the noise from the selected sensor. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-83...
Page 214: Gpib Emulation Modes
HP437 and HP438 units. For example: -14.236 may be output by the HP437 or HP438 as '-14.236e00' or '-1.4236e+01'. The ML243xA in HP437 or HP438 emulation modes will output as the manual specifies '-1.4236e+01'. 8-84 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 215: 8-10 Ml4803A Emulation Commands
This is done in sync with the RQS bit giving an SRQ. Bit 5 Command error Set on receiving an unrecognized command. The bit is cleared by reading the status byte. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-85...
Page 216: Output Requests
Unsupported Commands The following ML4803A commands are not supported in the ML243xA Power Meter GPIB interface: DBV50 DBV75 VLT50 VLT75 These commands are read in without errors, but are ignored by the system. 8-86 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 217: Ave (Sensor Averaging Setting)
Syntax: COS (Turn ON the 50 MHz, 0 dBm RF calibrator output) Syntax: CRF (Clear the reference value to zero) Syntax: CST (Turn OFF the 50 MHz, 0 dBm RF calibrator output) Syntax: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-87...
Page 218: Dbm (Sets The Display Channel Units To Dbm)
The relative value is stored as the reference data. The reference value can be independently changed with the GPIB command REF. EMUL (GPIB emulation mod) Syntax: EMUL <mode> mode: ML24XX (Anritsu ML243xA native mode) HP436A (Hewlett-Packard) HP437B (Hewlett-Packard) HP438A (Hewlett-Packard) ML4803 (Anritsu ML4803A Series) Remarks: Set the GPIB emulation to emulate other types of power meters.
Page 219: Mcc (Clears The Cal Factor Value At The Specified Memory Location)
Clears frequency, cal factor, offset and reference values at memory store <mem>. MDI (Disable memory store setting and use) Syntax: MEN (Enable setting of the memory stores) Also will apply the last memory store configured) Syntax: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-89...
Page 220: Mfg (Set The Frequency Value At The Specified Location In Ghz)
MRF (Set the reference value at the specified location in dBm) Syntax: MRF<mem><;><value> mem: Memory location 1 to 30. value: Reference value in dBm. Remarks: Set the reference value at memory store address <mem> to <value> dBm. 8-90 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 221: Odt (Output The Current Calibration Factor, Offset, And Reference Level)8-91
<CR><LF> 5 character data Figure 8-4. ODT Data Output Format OFF (Set sensor offset value) Syntax: OFF<value> value: Offset value to add to the sensor reading. OI? (Request identity) Syntax: Remarks: Response: <ML4803> ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-91...
Page 222: Omr (Output A Memory Store Set Of Data)
OPW command is used. The format of the returned data is: <CR><LF> EXPONENT STATUS MODE RANGE AVERAGE SIGN 5 CHARACTER DATA ALWAYS “_” ALWAYS “E” Figure 8-6. OPW Output Data Format 8-92 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 223 1 (1 s interval) AVE2 2 (2 s interval) AVE3 3 (5 s interval) AVE4 4 (10 s interval) Space SIGN Numeric data (5 characters) x DATA –(exponent value) Figure 8-7. Data Output Codes ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-93...
Page 224 100.0 µW = 100.0E–6 10.00 nW = 10.00E–9 10.00 µW = 10.00E–6 0.100 nW = 0.100E–9 For dB (rel), including % and VSWR data, the display data is output in fixed notation just as dBm data is. 8-94 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 225: Ref (Set The Reference Value)
The SRQ is set back on by the SRQ1 command or by requesting data. STA (Restart averaging reading) Syntax: WAT (Sets the display channel units to Watts) Syntax: Remarks: Turns off relative mode. Relative is not available in this mode. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-95...
Page 226: Zaj (Zero The Sensor)
When emulating the ML4803, the ML2430 may take longer to zero a sensor than the ML4803 itself. When performing a zero, the status byte should be used to identify when zeroing is complete. 8-96 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 227: Hp436A Emulation Commands
9 (Auto range) Syntax: Remarks: Sets the ML243xA to automatically select the correct range for the measurement. A (Wat) Syntax: Remarks: Set units to Watts. Turn relative mode off and do not allow relative. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-97...
Page 228: B (Db (Rel)
Remarks: Set units to dBm. EMUL (Select emulation mod) Syntax: EMUL <mode> mode: ML24XX (Anritsu ML243xA native mode) HP436A (Hewlett-Packard) HP437B (Hewlett-Packard) HP438A (Hewlett-Packard) ML4803 (Anritsu ML4803A Series) Remarks: Sets the GPIB emulation to emulate other types of power meters. This command is available in any emulation mode, and resets the whole GPIB interface when the emulation mode is changed.
Page 229: H (Hold Mod)
GPIB and returns to standby mode (H). V (Free run mode with settling) Syntax: Remarks: Sets the ML243xA back into free run mode to continuously take measurements and output data after running a settling routine. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-99...
Page 230: Z (Zero Sensor)
Multiplier 10 Point Character - 10 11 0 1 2 3 4 5 6 7 CR LF Number Status Mode Measured Exponent Value (2 digits) (4 digits) Figure 8-9. HP 436A Output Data Format 8-100 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 231 Power Sensor Auto Zero loop enabled; not range 1 under range Power Sensor Auto Zero loop enabled; over range Range 1 (Most sensitive) 5 (Least sensitive) Mode Watt dB Rel dB ref Sign of Measured Value Space (+) - (minus) Measured Value Digits ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-101...
Page 232: 8-12 Hp437B Emulation Commands
The format for HP Emulation commands is: <command header><parameter 1><parameter n>... The end of the command text must be terminated with a line feed character (0Ah, decimal 10) or a GPIB End of Transmission State (EOI), or both. 8-102 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 233: Cls (Clear Gpib Status Byte)
Bit 5: Command error Bit 4: Execution error Bit 3: Device Dependent error Bit 2: N/A Bit 1: N/A Bit 0: N/A See the HP437B manual for details about the HP status registers. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-103...
Page 234 3 2 1 0 Status Byte Register Request ESB MAV Generation read by *STB? Service Request Enable Register *SRE <NRf> 5 4 3 2 1 0 *SRE? Figure 8-10. IEEE 488.2 Standard Status Structures 8-104 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 235: Ese? (Return Event Status Register Enable Mask)
*SRE (Setup service request enable register) Syntax: *SRE <val> val: 8-bit mask Remarks: Sets the Service request enable register bits. *SRE? (Return Service Request Enable register) Syntax: *SRE? Remarks: Returns the Service Request Enable register. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-105...
Page 236: Stb? (Return Status Byte Register)
Bit 0: Data ready Bit 1: Cal/Zero complete Bit 2: Entry Error Bit 3: Measurement error Bit 4: Over/Under limit Bit 5: Event Status Register Bit 6: Request Service Bit 7: N/A Related commands: 8-106 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 237: Cl (Cal Adjust)
DA (Display All) Syntax: Remarks: Turns on all the segments of the display to verify proper operation. The display is returned to normal when another command is sent. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-107...
Page 238: Dc (Duty Cycle State)
Turns the display off to allow faster measurements to be taken. Related DD, DE commands: DR (Set GPIB address) Syntax: DR<val><terminator> val: 1 to 30 terminator: Remarks: Changes the device address. The power meter default address is 13. 8-108 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 239: Dy (Duty Cycle)
Remarks: Sets the duty cycle to be applied to the input signal. EMUL (GPIB emulation mode) Syntax: EMUL <mode> mode: ML24XX (Anritsu ML243xA native mode) HP436A (Hewlett-Packard) HP437B (Hewlett-Packard) HP438A (Hewlett-Packard) ML4803 (Anritsu ML4803A Series) Remarks: Set the GPIB emulation to emulate other types of power meters. This command is available in any emulation mode, and resets the whole GPIB interface when the emulation mode is changed.
Page 240: En (Enter Command)
FA (Auto average) Syntax: Remarks: Automatic Filter on. Allows the system to automatically select the filter used to reduce the jitter in the display. Related FM, FH commands: 8-110 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 241: Fh (Average Hold)
HZ (Hz) EN (Hz) Remarks: Sets the frequency of the input signal so that the correct cal factor is used. Example: To set the frequency of the input signal to 300 MHz: FR300MZ ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-111...
Page 242: Gt (Set Group Trigger)
For example: GT1 sets the’ GET’ (Group Execute Trigger) to perform a TR1 type trigger. Related commands: ID (Return identification string) Syntax: Remarks: Returned format: <company name>,<model>,<firmware version> IDN? (HP437B identity request) Syntax: IDN? Remarks: Returned format: <company name>,<model>,<firmware version> 8-112 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 243: Kb (Calibration Factor)
LH<val>EN val: -200 to +200 (dBm only) Remarks: Sets the high limit. Example: LH30.00EN LL (Set low limit) Syntax: LL<val>EN val: -200 to +200 (dBm only) Remarks: Sets the low limit. Example: LL20.00EN ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-113...
Page 244: Lm (Limits Check State)
MHz 100.0%'. The EX command terminates this action so that further 'OD' commands now output the display reading in a formatted mode. If RFnOD (n = cal factor table number) is sent, the 50 MHz cal factor table entry is output. 8-114 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 245: Of (Offset State)
Presets the unit to the HP factory defaults. This command does not effect the calibration factors stored in the sensor data tables. RA (Auto Range) Syntax: Remarks: Sets the ML243xA to automatically select the correct range for the measurement. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-115...
Page 246: Rc (Recall Setup)
RH (Range hold) Syntax: Remarks: Hold the power meter in the current range. The differences in sensor ranges must be taken into account when the ML2430 is being used to emulate the HP437. 8-116 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 247: Rl (Relative Mode)
Converting the integer value into an 8-bit binary number, each bit corresponds to the Service Request mask bits. SE (Select cal factor table) Syntax: SE<table_number>EN table number: 0 to 9 Remarks: Selects the cal factor table to be used. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-117...
Page 248: Sm (Status Message)
G: pwr ref status H: REL mode status I: trigger mode J: group trigger mode K: limits checking status L: sensor A limits status M: 0 N: offset status O: duty cycle status P: measurement units 8-118 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 249: St (Store Setup)
TR0 command was sent. If the REM line is low, this command has no effect. Related TR1, TR2, TR3, *TRG, Group Execute Trigger (GET), GT0, GT1, GT2 commands: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-119...
Page 250: Tr1 (Trigger Immediate)
Zero all connected sensors. The ML2430, when emulating the HP437, may take longer to Zero a sensor than the HP437 itself. When performing a zero the status byte should be used to identify when ZEROing is complete. 8-120 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 251 The end of the command text must be terminated with a line feed character (0Ah, decimal 10) or a GPIB End of Transmission State (EOI), or both. The ML243xA in HP438A emulation mode also supports the HP437B cal factor table edit and read commands. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-121...
Page 252: Id (Hp Identity Request)
AR (Set display A / B) Syntax: Remarks: Display the Input A reading divided by the Input B reading. BD (Set display B – A) Syntax: Remarks: Display the Input B reading minus the Input A reading. 8-122 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 253: Bp (Set Single Sensor B Display)
Turns on all the segments of the display to verify proper operation. The display is returned to normal when another command is sent. DD (Display disable) Syntax: Remarks: Turns the display off to allow faster measurements to be taken. Related commands: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-123...
Page 254: De (Display Enable)
Changes the device address when operating in HP emulation mode. The power meter default address is 13. EMUL (GPIB emulation mode) Syntax: EMUL <mode> mode: ML24XX (Anritsu ML243xA native mode) HP436A (Hewlett-Packard) HP437B (Hewlett-Packard) HP438A (Hewlett-Packard) ML4803 (Anritsu ML4803A Series) Remarks: Set the GPIB emulation to emulate other types of power meters.
Page 255: Fh (Average Hold)
2 = Trigger with delayed response to ‘GET’ command The GTn command configures what the device does when it receives the ‘GET’ command. For example: GT1 sets the’ GET’ (Group Execute Trigger) to perform a TR1 type trigger. Related commands: ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-125...
Page 256: Kb (Calibration Factor)
LL<val>EN val: -200 to +200 (dBm only) Remarks: Sets the low limit. Example: LL20.00EN LM (limits check state) Syntax: LM<state> state: 0 (off) or 1 (on) Remarks: Turns limit checking on or off. 8-126 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 257: Ln (Set Linear Units)
-200 to +200 (dBm only) Remarks: Specifies the offset applied to the displayed value. Values can be entered in 0.01 dB increments. Example: To set an offset of 10.13 to the displayed value: OS10.13EN ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-127...
Page 258: Pr (Preset The Unit)
RH (Range hold) Syntax: Remarks: Hold the power meter in the current range. The differences in sensor ranges must be taken into account when the ML2430 is being used to emulate the HP438. 8-128 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 259: Rl (Relative Mode)
RV (Service request mask value) Syntax: Remarks: Read service request mask value. The returned string format is: <integer value> Converting the integer value into an 8-bit binary number, each bit corresponds to the Service Request mask bits. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-129...
Page 260: Sm (Status Message)
ST (Store setup) Syntax: ST<val>EN val: 1 to 10 Remarks: Stores the present configuration to the selected register. Example: To store the current instrument configuration in register 2: ST2EN Related commands: 8-130 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 261: Tr0 (Trigger Hold Mode)
Zero all connected sensors. The ML2430, when emulating the HP438, may take longer to Zero a sensor than the HP438 itself. When performing a zero the status byte should be used to identify when ZEROing is complete. ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-131...
Page 262: Programming Examples
Call DLLsend(0, 13, Cmd, CmdLength, NLend, ibsta%, iberr%, ibcntl&) ' Receive the data from ML2430A at address 13 Call DLLreceive(0, 13, result, 10, STOPend, ibsta%, iberr%, ibcntl&) ' Pass result back GetReading = Val(result) End Function 8-132 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 263: Get Graph Data
GraphData(I) = Val(Mid(result, 1, next_place)) ‘ reduce the elements by one ‘ (the one we have just put in the array) result = Right(result, Len(result) - InStr (result, “,”)) Next I End Function ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-133...
Page 264: Status Register Control
Result_Code% argument. For example: Use 4882SendReceive(0, 13, “O 1”, Result$, Result_Code%) to return a reading from the ML243xA. Note that this function is written in “pseudo code” and cannot be executed as is. 8-134 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 265 ‘ Now check if anything has gone wrong. If (Val(ESB) And CMD_ERR_bit) Then 4882SendReceive = Command_Error ElseIf (Val(ESB) And EXEC_ERR_bit) Then 4882SendReceive= Execution_Error ElseIf (Val(ESB) And DEVICE_ERR_bit) Then 4882SendReceive = Device_dependent_Error End If End Function ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-135...
Page 266: Binary Output Message Decoding
/********************* Decode header ************************/ /* Find # character. */ cptr = strtok(&buffer[0],"#"); cptr = strtok(NULL,"#"); /* Get the number of characters for binary length */ ch_val[0] = *cptr++; ch_val[1] = NULL; count = atoi(&ch_val[0]); 8-136 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 267 /* Read and cast the data */ while (count < length) real_data1[loop++] = ((float)(*bin_value++))/1024.0; count += 4; real1_entries = loop; else if (decode_type == OFFSET_TABLE_BINARY_DATA) /* Decode header */ /* Find # character. */ cptr = strtok(&buffer[0],"#"); ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-137...
Page 268 = 0; while (count < length) /* Frequency conversion */ bin_data.cval[2] = *cptr++; bin_data.cval[3] = *cptr++; bin_data.cval[0] = *cptr++; bin_data.cval[1] = *cptr++; real_data1[loop] = bin_data.fval; /* dB conversion */ bin_data.cval[2] = *cptr++; 8-138 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 269 = 8; for (loop = 0; loop < count; loop++) ident[loop] = *cptr++; length—; ident[count] = NULL; /* Read number of entries*/ bin_data.cval[0] = *cptr++; bin_data.cval[1] = *cptr++; bin_data.cval[2] = 0; bin_data.cval[3] = 0; ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-139...
Page 270 = *cptr++; real_data1[loop] = ((float)(bin_data.lval))/32768e-6; /* dB conversion */ bin_data.cval[0] = *cptr++; bin_data.cval[1] = *cptr++; bin_data.cval[2] = 0; bin_data.cval[3] = 0; real_data2[loop++] = ((float)(bin_data.ival))/1024.0; count += 6; real1_entries = loop; real2_entries = loop; 8-140 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 271: A-1 Getting Support
• List of error messages • Description of steps required to reproduce the problem • Actions already taken to correct the problem Every effort will be made to ensure that you are contacted within one working day. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 272 Getting Support PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 273: B-1 System Configuration
-5.0 V to 5.0 V Resolution: 0.1 mV Trigger Input: Operating Modes: External TTL or RF Blanking. GPIB Interface: IEEE-488.2 and IEC-625. Implements AH1, SH1, T6, LE0, SR1, RL1, PP0, DC1, DT1, C0 and E1. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 274 Width: 8.540" (21.691 cm) (standard case with feet and no handle) Weight: <6.6 lb (<3 kg) excluding optional battery Accessories Furnished: Operation and Programming Manual Sensor Cable: One per input Power cord plug that matches destination requirements. PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 275: B-2 System Defaults
SYSTEM - setup = readout or Power vs. Time Mode auto mode ( HP437B & HP438A ) auto mode = moving mode = repeat averaging number auto low level averaging SYSTEM - setup = profile ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 276 0 dBm high limit ( HP437B ) 90 dBm high limit ( HP438A ) 0 dBm low limit 0 dBm low limit ( HP437B ) -90 dBm low limit ( HP438A ) 0 dBm PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 277 SYSTEM - setup = profile TRIGGER - setup source continuous sample delay 1 ms sample gate width 20 ms source = continuous, manual trigger arming blanking off source = internal A, internal B trigger arming blanking off ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 278 = frequency sweep start 10 MHz sweep stop 20 GHz mode = power sweep start -10 dB sweep stop +10 dB mode = profile, power vs time, source sweep SYSTEM - control PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 279 GPIB address 13 (factory preset only) emulation mode ML24xx (factory preset only) SYSTEM - rear panel - RS232 mode EXT COMMS baud rate 9600 (factory preset only) modem redial count 5 delay 5 minutes ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 280 TTL during zero high input 1 blanking active TTL level high SYSTEM - rear panel - printer printer type HP Deskjet 340 (factory preset only) SYSTEM - graphics connect graph points tracking min max single sweep PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 281 System Defaults graph ref line pre-trigger percentage 10 % SYSTEM - secure secure state CAL/ZERO RF calibrator ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 282: B-3 System Error Messages
This section details some of the front panel error messages that may appear. In most cases, the error condition can be easily corrected. If not, note the error message and contact the nearest Anritsu Service Center. Errors shown here with xxxx in the display contain a numeric error code.
Page 283 Cannot delete last cal factor data pair in selected table, or cannot add cal factor data pair in selected table Internal error (P22) Cannot delete 50 MHz cal factor in selected table Internal error (P23) Non valid cal factor table ML2437A/38A OM/PM PN: 10585-00001 Rev. P B-11...
Page 284: B-4 Calibration And Zero Error Codes
Reference voltage range calibration failure DxDD, x=odd number Range 4 failed to saturate during calibration DxDD, x=non zero Residual Zero too high (+ve) on ranges 3-5 XDDD, x=non zero Residual Zero too high (-ve) 0n ranges 3-5 B-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 285: C-1 Ml24Xxa Quick Reference
Turn RF reference calibrator ON or OFF VZERO Zero the BNC input connector ZERO Zero the sensor Channel Functional Group Commands Table C-3. Channel Functional Group Commands Command Function CHCFG(?) Channel input configuration CHRES(?) Set channel decimal point resolution ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 286: Data Output Functional Group Commands
Replies with the power meter’s current state code STERR Returns the results of the POST or *TST? command SYSLD Sets the store number for the saved setup SYSRD Output the saved setup over the GPIB PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 287: Display Functional Group Commands
GPIB Setup Functional Group Commands Table C-7. GPIB Setup Functional Group Commands Command Function ADDR(?) Change GPIB address CONT Continue EMUL GPIB emulation mode FAST(?) Operate in non-488.2 compliant mode START Initial startup self test command ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 288: Gpib Trigger Functional Group Commands
Profile data collection period GRPTP(?) Graph Pre-trigger Percentage GRSWP(?) Sweep to Sweep averaging GRSWR Reset Profile Sweep to Sweep Averaging GRTMM(?) Profile Min/Max tracking mode GRYB(?) Set profile Y-axis bottom scale GRYT(?) Set profile Y-axis top scale PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 289: Sensor Functional Group Commands
Offset fixed value OFFTBL(?) Select an offset table OFFTBR Output an offset table OFFTBU Update an offset table OFFTYP(?) Offset type to use OFFVAL Sensor Offset Value RGH(?) Range Hold Sensor SENMM(?) Sensor Measurement mode ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 290: System Functional Group Commands
Redial count MODRNG Autodial enable for range error OPMD(?) Operation mode PRINT Send details to the connected printer PRNSEL Select the type of printer RSBAUD(?) Set the RS232 Baud rate SECURE(?) Secure system state PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 291: Trigger Functional Group Commands
TRGARM(?) Trigger arming TRGDLY(?) Trigger sample delay TRGGW(?) Set trigger gate width TRGLVL(?) Set trigger level TRGMODE Change trigger mode TRGSRC(?) Set trigger source TRGTYP(?) Set Trigger type TRGXTTL(?) Set external trigger edge type ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 292: Ml24Xxa Native Mode Query Commands
DTRGD <VAL> DUTY? <S> DUTY <S>,<DUTY CYCLE> DUTYS? <S> DUTYS <S>,<STATE> ENTERR? ENTERR <STATE> FBEEP? <C> FBEEP <C>,<STATE> FHOLD? <C> FHOLD <C>,<STATE> FROFF? FROFF <STATE> GRAVG? GRAVG <STATE> GRCP? GRCP <STATE> GRDATA? GRDATA <STATE> PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 293 MNMXS? <C> MNMXS <C>,<STATE> MODDEL? MODDEL <value> MODLIM? MODLIM <true> or <false> MODPH? MODPH <phone_number> MODPWR? MODPWR <true> or <false> MODRED? MODRED <count> MODRNG? MODRNG <true> or <false> OBACM? OBACM <POLARITY> OBCH? <PORT> OBCH <PORT>,<C> ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 294 SYSLNM? <STORE NO> SYSLNM <STORE NO>,<STORE NAME> TEXT? TEXT <TEXT STRING> TEXTS? TEXTS <STATE> TRGARM? <C>* TRGARM <C>,<STATE> TRGDLY? <C>* TRGDLY <C>,<VAL> TRGGW? <C>* TRGGW <C>,<VAL> TRGLVL? <C>* TRGLVL <C>,<VAL> TRGMODE? TRGMODE<MODE> TRGSRC?<C>* TRGSRC <C>,<SOURCE> C-10 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 295 ML24XXA Quick Reference Table C-13. ML24xxA Native Mode Query Commands Query Return String TRGTYP? <C>* TRGTYP <C>,<TYPE> TRGXTTL? <C>* TRGXTTL <C>,<TYPE> ML2437A/38A OM/PM PN: 10585-00001 Rev. P C-11...
Page 296: C-2 Ml4803A Quick Reference
Enable setting of the memory stores and apply the last memory store configured Set the frequency value at the specified memory location in GHz Set the frequency value at the specified memory location in MHz C-12 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 297 Request for channel reading Set the reference value Sensor measurement range hold Turns on or off the SRQ on output data ready Restart averaging reading Set the display channel unit to Watts Zero the sensor ML2437A/38A OM/PM PN: 10585-00001 Rev. P C-13...
Page 298: C-3 Hp436A Quick Reference
Set sensor operating range Auto range Watt dB (rel) dB (ref) EMUL Select emulation mode Hold mode Trigger without settling Identification Free run mode Trigger with settling Free run mode with settling Zero sensor C-14 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 299: C-4 Hp437B Quick Reference
Set sensor operating range Auto range Watt dB (rel) dB (ref) EMUL Select emulation mode Hold mode Trigger without settling Identification Free run mode Trigger with settling Free run mode with settling Zero sensor ML2437A/38A OM/PM PN: 10585-00001 Rev. P C-15...
Page 300: C-5 Hp438A Quick Reference
Set group trigger Calibration factor Set log units Set high limit Set low limit Limits check state Set linear units Set calibrator state Identification Set offset value Preset the unit Auto Range Recall setup C-16 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 301 Command Function Range hold Relative mode Range hold set Read service request mask value. Status message Store setup Trigger hold mode Trigger immediate Trigger with a settling delay Trigger free run Zero sensors ML2437A/38A OM/PM PN: 10585-00001 Rev. P C-17...
Page 302: C-6 Hp-Ib Support
HP-IB Support The following tables list HP-IB commands for the HP437B and HP438A power meters, and which commands are supported in the Anritsu ML243xA power meter. Restrictions, if any, are also listed. Commands that are not supported will be ignored.
Page 303 None Set offset value OSDOEN not supported Terminator None Preset None Auto range None Recall setup Limited to 10 stores Resolution Set screen decimal places RF0-RF9 Sensor cal factors None Range hold None ML2437A/38A OM/PM PN: 10585-00001 Rev. P C-19...
Page 304 GPIB trigger hold None Immediate trigger None Settled trigger None Trigger hold off None *TST? Selftest Always returns 0 Up arrow Not supported Status mask None Learn mode 2 Not supported Terminator None C-20 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 305: Hp438A Commands
Set low limit On channel not sensor Limit check off Both high and low off as HP437B Limit check on Both high and low on as HP437B Units to Watts None Learn mode1 Not supported ML2437A/38A OM/PM PN: 10585-00001 Rev. P C-21...
Page 306 The HP438 emulation mode supports the HP437 cal factor table Note commands on the ML243xA. This allows the cal factor tables to updated or read since the ML243xA supports cal factor tables. C-22 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 307: D-1 Pin Depth Mating Connectors
RF component connector. A destructive pin depth is one that is too long in respect to the reference plane of the connector (see figure below). Figure D-1. N Connector Pin Depth Definition ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 308: D-2 Torquing Connectors
The pin depth of EUT connectors should be measured to assure compatibility before attempting to mate them with Power Sensor connectors. An Anritsu Pin Depth Gauge or equivalent can be used for this purpose. Figure D-2. Pin Depth Gauge If the measured connector is out of tolerance in the "+"...
Page 309: D-4 Cleaning Connectors
• Verify that no cotton or other foreign material remains in the connector after cleaning. • If available, use compressed air to remove foreign particles and to dry the connector. • After cleaning, verify that the center pin has not been bent or damaged. ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 310 Cleaning Connectors PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 311 ....2-5 software ......1-1 ML2437A/38A OM/PM PN: 10585-00001 Rev. P...
Page 312 ....6-1 technical support ....A-1 Index-2 PN: 10585-00001 Rev. P ML2437A/38A OM/PM...
Page 314 Anritsu Company 490 Jarvis Drive Anritsu utilizes recycled paper and environmentally conscious inks and toner. Morgan Hill, CA 95037-2809 http://www.anritsu.com...

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Ml2438a

Anritsu ML2437A Operation And Programming Manual

Chapter 1-General Information

Chapter 2-Installation

Chapter 3-Memory And Security Considerations

Chapter 4-Connections

Chapter 5-Front Panel Operation

Chapter 6-Procedures

Chapter 7-Measurement Examples

Chapter 8-GPIB Operation

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Summary of Contents for Anritsu ML2437A