Keysight Technologies N432A User Manual
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Keysight Technologies N432A User Manual

Thermistor power meter
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Keysight N432A Thermistor
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  • Page 1 Keysight N432A Thermistor Power Meter User’s Guide...
  • Page 2 FAR 27.401 or DFAR could result in personal injury or death. 227.7103-5 (c), as applicable in any Do not proceed beyond a WARNING technical data. notice until the indicated conditions are fully understood and met. Keysight N432A User’s Guide...

  • Page 3: Certification

    Certification Keysight Technologies certifies that this product met its published specifications at the time of shipment. Keysight further certifies that its calibration measurements are traceable to the United States National Institute of Standard and Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility, and to the calibration facilities of other...

  • Page 4: Limitation Of Warranty

    To the extent allowed by local law, the remedies provided herein are the Buyer’s sole and exclusive remedies. Keysight shall not be liable for any direct, indirect, special, incidental, or consequential damages (including lost profit or data), whether based on warranty, contract, tort, or any other legal theory. Keysight N432A User’s Guide...

  • Page 5: Restricted Rights Legend

    Technology Licenses The hardware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license. Keysight N432A User’s Guide...

  • Page 6: Safety Symbols

    ‘Stand-by’ mode. Note, the instrument is NOT isolated from the mains when the switch is pressed. To This symbol indicates the Fuse. isolate the instrument, the mains coupler (mains input cord) should be removed from the power supply. Keysight N432A User’s Guide...

  • Page 7: Safety Considerations

    Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements. Recommended Calibration Interval Keysight Technologies recommends a two-years calibration cycle for the N432A Thermistor power meter. Keysight N432A User’s Guide...

  • Page 8: General Safety Information

    REMOVE POWER and do not use the product until safe operation can be verified by service-trained personnel. If necessary, return the product to a Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained.
  • Page 9 Return the product to a Keysight Technologies Sales and Service Office for service and repair to ensure the safety features are maintained. CLEAN WITH SLIGHTLY DAMPENED CLOTH...

  • Page 10: Regulatory Markings

    Radio Communications Act of 1992. This symbol is a South Korean Class A EMC Declaration. This equipment is Class A suitable for professional use and is for use in electromagnetic environments outside of the home. KCC-REM-ATi- WCPWR Keysight N432A User’s Guide...

  • Page 11: South Korean Class A Emc Declaration

    This EMC statement applies to the equipment only for use in business environment. Safety and EMC Requirements The N432A Thermistor power meters are designed to comply with the following safety and EMC (Electromagnetic Compatibility) requirements: Safety compliance – Low Voltage Directive 2014/35/EU EMC compliance –...

  • Page 12: Waste Electrical And Electronic Equipment (Weee) Directive

    To contact Keysight for sales and technical support, refer to the support links on the following Keysight websites: – www.keysight.com/find/powermeter (product-specific information and support, software and documentation updates) – www.keysight.com/find/assist (worldwide contact information for repair and service) Keysight N432A User’s Guide...

  • Page 13: Table Of Contents

    .......31 Using the N432A Web Interface .......34...
  • Page 14 ......... . . 77 Saving and Recalling N432A States .
  • Page 15 ........135 Keysight N432A User’s Guide...
  • Page 16 THE PAGE HAS BEEN INTENTIONALLY LEFT BLANK Keysight N432A User’s Guide...

  • Page 17: Introduction

    Sensor Compatibility Conventions Used in This Guide Front Panel Outlook Rear Panel Connections Display Layout Window Symbols and Pop-Ups Using the N432A Web Interface Making the Socket Connection This chapter provides a general overview of the N432A thermistor power meter.

  • Page 18: Lxi Class-C Compliant N432A

    The N432A basic configuration consists of two key sections; bridge and meter logic. When a compatible thermistor sensor is connected to the N432A, the RF and compensation bridge circuits are formed in the bridge section. V , which is the voltage at the top of the RF bridge, is responsive to both input RF power and ambient temperature changes.

  • Page 19: Sensor Compatibility

    Sensor Compatibility The N432A is compatible with the Keysight 478A and 8478B thermistor sensors. The following table lists the frequency range and operating resistance for each of these thermistor sensors: Thermistor sensor model Frequency range (GHz) Operating resistance (Ω) 478A 0.01 to 10...

  • Page 20: Conventions Used In This Guide

    Conventions Used in This Guide The following conventions are used throughout this guide. This symbol and text represents a labeled key on the N432A front panel This symbol and text represents a labeled softkey, and is used to indicate that...

  • Page 21: Front Panel Outlook

    These keys are located to the left of the display. Function Press this key to preset the N432A to its default state Press this key to control the N432A from the front panel when it is operating via the remote interfaces (when Local Lock Out is disabled) Press this key to select the upper or lower measurement window.
  • Page 22 Press this key to access the measurement display menu. You can select the displayed measurement resolution, unit, and display format. Use this key together with to configure measurement displays. Keysight N432A User’s Guide...
  • Page 23 For example, a 1 of 2 is displayed beside the key indicating the first page of a two-page menu. Press the key to access the next page or the second page (a 2 of 2 is displayed). Keysight N432A User’s Guide...
  • Page 24 Press this key to access the zeroing menu Press this key to reset the MAX HOLD and MIN HOLD measurements Press these keys to enter numeric values in the pop-up fields, for example, the offset values. To complete the entry, use the softkey. Keysight N432A User’s Guide...
  • Page 25 478A or 8478B thermistor sensor and meter system. The yellow LED beside the connector is lit when turned on. Thermistor mount input connector for 1.5 m, 3 m, and 6.1 m cables that connect to the 478A or 8478B thermistor sensors Keysight N432A User’s Guide...

  • Page 26: Rear Panel Connections

    AC inlet The N432A has an autoconfiguring power supply. This allows it to operate over a range of voltages without manually being set to a certain voltage. and V...

  • Page 27: Display Layout

    4 The information in this field is displayed in two lines and depends on the sensor calibration factor, sensor calibration and frequency-dependent offset tables currently selected, and the measurement frequency. 5 This field displays the menu title. For example, Channel Setup, or press and the Zero/Cal menu is displayed. Keysight N432A User’s Guide...
  • Page 28 12 This field displays the current bridge resistance value as an indicator with or without the thermistor sensor connected. 13 The lower window is configured to show an analog meter which displays the measurement result and the meter scaling. Keysight N432A User’s Guide...
  • Page 29 18 This field displays Dty Cyc if a duty cycle is set. 19 This field displays Ofs if an offset is set. 20 This field displays Rel if relative mode is enabled. Keysight N432A User’s Guide...
  • Page 30 If the measurement result is within the limits, this field is empty. If the measurement result is less than the minimum limit set, Undr Lmt is displayed. If the measurement result is more than the maximum limit set, Over Lmt is displayed. Keysight N432A User’s Guide...

  • Page 31: Window Symbols And Pop-Ups

    Window Symbols and Pop-Ups There are several different graphic symbols and pop-up messages that can occur on the N432A display. These can occur for a variety of reasons, such as: – An error or warning occurs – You are required to wait while the N432A carries out a procedure –...
  • Page 32 Wait symbol pop-up The wait symbol is displayed when the N432A is carrying out a procedure and no action is required from you. The symbol appears in a pop-up message, for example, during zeroing. Confirm symbol pop-up This type of pop-up message is displayed when you are required to press Confirm to verify your previous selection, for example, prior to a Save being carried out.
  • Page 33 List pop-up This pop-up list is displayed when you are required to select an entry from a list. Use the up/down arrow key to highlight your selection. Press to complete the entry. Keysight N432A User’s Guide...

  • Page 34: Using The N432A Web Interface

    NOTE Thermistor Power Meter Installation Guide. Alternatively, the Web interface can also be accessed directly from a Web browser by entering the N432A IP address or host name in the Address panel of the browser. Figure 1-4 Accessing the N432A Web interface from the Connection Expert The Welcome page of the N432A Web interface is shown as follows: Keysight N432A User’s Guide...
  • Page 35 TCPIP Connect String, VISA USB Connect String, and GPIB address are shown on the Welcome Page. Click Advanced Information… to display more information on the N432A. – The N432A has an embedded Web server, which is listening on port 80 to NOTE serve Web pages.
  • Page 36 The “IDENTIFY” message will blink to identify the N432A until you click Turn Off Front Panel Identification Indicator. The “IDENTIFY” message will blink when the front panel identification indicator is turned on. Figure 1-6 Blinking message to identify the N432A...
  • Page 37 An IP address will be obtained from the auto IP or manual configuration Using the remote front panel The N432A Web interface also provides a virtual front panel interface that can be used to control the N432A remotely. 1 On the left of the Welcome Page, select Browser Web Control. The virtual front panel will appear as shown below.
  • Page 38 NOTE Editing the N432A LAN settings Once the communication path to the N432A has been established, the N432A LAN configuration can be viewed and modified using the Web interface. 1 On the Welcome page, click View and Modify Configuration at the left of the page.
  • Page 39 Password dialog box will appear as follows. Figure 1-10 Enter Password dialog box 3 Click Submit (to accept the default password), and the page as shown in Figure 1-11 will be displayed. The default password is “keysight”. Keysight N432A User’s Guide...
  • Page 40 LAN Reset When is pressed, it will also change the GPIB address to default. LAN Reset You can change the password from the Configuring your N432A Power Meter page as shown in Figure 1-11. Scroll down the Parameter column until you locate the Change Password parameter.
  • Page 41 Capturing the screen image Use the following steps to save the N432A display from the Web interface: 1 On the left of the Welcome Page, select Get Image. The screen image will be displayed as shown below. Figure 1-12 Screen capture 2 Right-click on the image and select Save Image As…..

  • Page 42: Making The Socket Connection

    Data. The data will be displayed in a text box. 4 Copy and paste the data into your intended PC application. Making the Socket Connection The N432A can be connected remotely via the socket connection as explained in the following procedure. Keysight N432A User’s Guide...
  • Page 43 4 Enter the Hostname or IP address of the power meter and click Test This VISA Address to verify if the power meter is properly connected. 5 Click OK. You will return to the Keysight Connection Expert window (Figure 1-15). Your N432A is now successfully connected via the socket connection. Keysight N432A User’s Guide...
  • Page 44 Figure 1-15 Add LAN Instruments dialog Keysight N432A User’s Guide...

  • Page 45: Operating Information

    Zeroing the N432A Using the Calibration/Correction Factors Power Measurement Procedures Voltage Standing Wave Ratio (VSWR) Measurement Blank Screen Secure Blank Backlight Intensity Control Memory Erase/Secure Erase Warm Start This chapter describes the general operation of the N432A thermistor power meter.

  • Page 46: Setting The Bridge Resistance

    2 Use the up/down arrow key to highlight the Bridge Resistance value field, and press to display the Bridge Resistance pop-up list. Use the up/down arrow key to highlight the desired resistance value, and press to enter the value. Figure 2-1 Bridge resistance pop-up list Keysight N432A User’s Guide...

  • Page 47: Setting The Resistance Type

    You can measure the value of Ruser using the following steps: 1 Set up the connections as shown in the figure below. The positive and negative terminals of a digital multimeter (DMM) are connected to the indicated N432A channel A input connector pin and rear panel V output connector pin respectively.
  • Page 48 Use the left/right arrow key to highlight the resistance value field, then press to display the Ruser pop-up. Use the numeric keypad to enter the required value and press to confirm the entry. Enter Keysight N432A User’s Guide...

  • Page 49: Setting The Measurement Unit

    The Units menu is used to select the measurement unit for the currently selected window. The unit can either be logarithmic (dBm or dB) or linear (Watt or %). Presetting ( ) the N432A sets the measurement unit to dBm. Table 2-1 shows the units that are applicable to each measurement type.

  • Page 50: Setting The Measurement Frequency

    4 Press to complete the selection of the offset table and press again to return to the channel setup screen. Press > Done complete the selection of the calibration table and return to the channel setup screen. Keysight N432A User’s Guide...
  • Page 51 Frequency value field and press to display the Frequency pop-up. Use the numeric keypad to enter the required value. Figure 2-5 Frequency pop-up 6 Confirm your selection by pressing 7 Press to exit the channel setup screen. Keysight N432A User’s Guide...

  • Page 52: Setting The Resolution

    Setting the Resolution The resolution of the N432A numeric type windows can be set to four different levels (1, 2, 3, or 4). These four levels represent: – 1, 0.1, 0.01, or 0.001 respectively if the measurement suffix is dBm or dB.

  • Page 53: Displaying Voltage Measurements

    Displaying Voltage Measurements The N432A allows you to view the voltage measurement values for the selected measurement window. Values of V , and V COMP0 COMP1 displayed together with the associated average power measurement value, PV is obtained after any channel offset has been applied but prior to any NOTE display offset.

  • Page 54: Making Relative Measurements

    4 Use the up/down arrow key to highlight the Relative setting field. Selected window/ measurement Relative setting field Result field Relative field Original result Figure 2-7 Typical relative measurement display 5 Press to select the Relative setting field. Keysight N432A User’s Guide...
  • Page 55 6 Confirm that the N432A is measuring the signal you want to use as the reference. This is displayed under the Result field. 7 Press the left/right arrow key to highlight the Rel field. 8 Press and the original result value will appear on the right of the Rel field.

  • Page 56: Setting Offsets

    Setting Offsets The N432A can be configured to compensate for a signal loss or gain in your test setup. The N432A allows you to apply offsets at three different points in the measurement path. Window functions Upper window Display Relative...
  • Page 57 Offset pop-up. Use the numeric keypad to enter the required value. 6 Confirm your entry by pressing 7 Press to exit the offset setup screen. If either a channel or a display offset is set, the Ofs indicator is displayed. Keysight N432A User’s Guide...
  • Page 58 2 Select the window you wish to set the offset value on by pressing Meas Select 3 Use the up/down arrow key to highlight the Offset setting field. 4 Press to select the Offset setting field. Keysight N432A User’s Guide...
  • Page 59 Note that when selected, frequency-dependent offset corrections are applied IN ADDITION to any correction for the sensor frequency response. The N432A is capable of storing 10 frequency-dependent offset tables with a maximum of 80 frequency points each. Keysight N432A User’s Guide...
  • Page 60 Use the following steps to select an offset table. 1 Press either: – > > Tables Freq. Dep. Offset – > , then use the up/down arrow key to highlight the FDO Table Offsets setting field and press to display the tables. Keysight N432A User’s Guide...
  • Page 61 Table NOTE (grayed out). 3 Press to complete the selection of the offset table. 4 The following figure shows the indicator for the selected offset table. Offset Table A selected Figure 2-13 Frequency-dependent offset table indicator Keysight N432A User’s Guide...
  • Page 62 Editing the frequency-dependent offset table There are 10 frequency-dependent offset tables named CUSTOM_A through CUSTOM_J. They are empty of any data when the N432A is shipped from the factory. You cannot delete any of the 10 existing frequency-dependent offset tables or create any additional tables.
  • Page 63 Figure 2-15 Edit table name pop-up – Pressing adds a new character to the right of the selected Insert Char character. – Pressing removes the selected character. Delete Char 4 Press to complete the entry. Enter Keysight N432A User’s Guide...
  • Page 64 If you measure a signal with a frequency outside the frequency range defined in NOTE the frequency-dependent offset table, the N432A uses the highest or lowest frequency point in the frequency-dependent offset table to calculate the offset. Keysight N432A User’s Guide...
  • Page 65 To change the offset unit to dB, press > > 1 of 2 Offset Unit To change the offset unit to %, press > > 1 of 2 Offset Unit Keysight N432A User’s Guide...
  • Page 66 – y is optional if there are zero numbers after the decimal point. For example, – 0.009876 will be displayed as 9.8760000 e–3 – 0.0001 will be displayed as 1.0000000 e–4. Figure 2-17 Offset display in the engineering unit (when the selected unit is Keysight N432A User’s Guide...

  • Page 67: Setting The Voltage Averaging

    Volt Avg pop-up list, and use the up/down arrow key to step through the available values. Press to enter the required value. Figure 2-18 Volt Avg pop-up list 4 Press to exit the channel setup screen. Keysight N432A User’s Guide...

  • Page 68: Step Detection

    2 Use the up/down arrow key to highlight the Step Detect setting field. 3 Press to toggle between turning on or off the step detection. 4 Press to exit the channel setup screen. Keysight N432A User’s Guide...

  • Page 69: Setting Measurement Limits

    Setting Measurement Limits You can configure the N432A to detect when a measurement has crossed over a predefined upper and/or lower limit value. Limits are boundaries set for a certain power range and it can be applied to the power, ratio, or difference measurement.
  • Page 70 Meter Maximum pop-up (if the current unit is W or %). 9 Repeat Step 6 and press to exit the measurement setup screen. The Limits setting can be disabled and re-enabled by selecting the Limits NOTE setting field. Keysight N432A User’s Guide...
  • Page 71 A limit failure is displayed on a specific field in the measurement window as shown below. This measurement has failed as the result is greater than the set limit level This measurement has failed as the result is less than the set limit level Figure 2-21 Limit failures Keysight N432A User’s Guide...

  • Page 72: Single Function Measurement

    Meas Select 2 Use the arrow keys to highlight the Combination function field. 3 Press to display the Function pop-up list, and use the up/down arrow key to highlight Single. Figure 2-23 Function pop-up list Keysight N432A User’s Guide...

  • Page 73: Combined Measurement

    Meas Select 2 Use the arrow keys to highlight the Combination function field. 3 Press to display the Function pop-up list (Figure 2-23), and use the up/down arrow key to highlight Combined. Keysight N432A User’s Guide...
  • Page 74 Combination pop-up list, and use the up/down arrow key to highlight the required measurement type. 7 Press to enter the selection. 8 Press to complete the setup and display the measurement results. Figure 2-25 Measurement display example Keysight N432A User’s Guide...

  • Page 75: Max Hold/Min Hold

    Max hold/min hold measurement performed on the ‘HOLD’ block Procedure Use the following steps to set max hold/min hold. 1 Press to access the measurement setup screen. 2 Use the up/down arrow key to highlight the Hold setting field. Keysight N432A User’s Guide...
  • Page 76 Min Hold and Max Hold measurement modes indicated on the display 6 Press to display the measurement window in the full screen mode. The max hold/min hold is indicated in full in the expanded window as shown in Figure 2-29. Keysight N432A User’s Guide...

  • Page 77: Recorder Output

    The Max Power and Min Power value fields allow you to scale the power levels to represent the 1 Vdc maximum and 0 Vdc minimum output voltages of the recorder output. Procedure Use the following steps to set the recorder output. Keysight N432A User’s Guide...
  • Page 78 7 Use the numeric keys to enter the power level you want to generate a output in the Recorder Minimum pop-up, and press the corresponding unit softkey. 8 Use the right arrow key to highlight the Max Power value field. Keysight N432A User’s Guide...
  • Page 79 Ranges of the recorder output setting 50 dBm 40 dBm 30 dBm 20 dBm Linear 100 W 10 W 100 mW –10 dBm –20 dBm –30 dBm –40 dBm Linear 100 mW 10 mW 1 mW 100 nW Keysight N432A User’s Guide...

  • Page 80: Saving And Recalling N432A States

    Saving and Recalling N432A States To reduce repeated setup sequences, you can save a maximum of 10 N432A states in the non-volatile memory. The save and recall functions are part of the Sys/Inputs menu, accessed by pressing Procedure Use the following steps to save a measurement setup.
  • Page 81 3 Use the up/down arrow key to modify the character on which the cursor is currently positioned. 4 Use the left/right arrow key to move to other characters. 5 Use as required. Insert Char Delete Char 6 To confirm your selection, press Enter Keysight N432A User’s Guide...
  • Page 82 2 Use the up/down arrow key to select the required register, and press Recall softkey is disabled (grayed out) when an unused register is Recall selected. 3 The N432A will prompt you to press to proceed. Confirm Figure 2-36 Recall confirmation pop-up dialog...

  • Page 83: Zeroing The N432A

    Zeroing the N432A Zeroing adjusts the N432A for a zero power reading with no power applied to the thermistor sensor. During zeroing (which takes approximately 25 seconds), the wait symbol is displayed. Figure 2-37 Zeroing pop-up message Upon each thermistor sensor connection, you will be prompted for bridge...

  • Page 84: Using The Calibration/Correction Factors

    However, if you are making measurements on a wide range of signal frequencies, a sensor table is more effective as you only need to enter the frequency of the signal you are measuring. The N432A automatically selects and applies the calibration factor from the selected table.
  • Page 85 The N432A is capable of storing 20 sensor calibration tables, each containing up to 80 frequency points. The N432A is supplied with a set of two predefined sensor calibration tables plus a “100%” default table. The data in these tables is based on statistical averages for a range of Keysight thermistor sensors.
  • Page 86 When no data is contained in the highlighted table, the key is disabled Table NOTE (grayed out). 3 Press to complete the selection of the calibration factor table. Done 4 The following figure shows the selected table. Keysight N432A User’s Guide...
  • Page 87 – If you enter a frequency outside the frequency range defined in the sensor calibration table, the N432A uses the highest or lowest frequency point in the sensor calibration table to set the calibration factor. – When the...
  • Page 88 [a] DEFAULT is a sensor calibration table where the reference calibration factor and calibration factors are 100%. This sensor calibration table can be used during the performance testing of the N432A. There are also 17 sensor calibration tables named CUSTOM_0 through CUSTOM_16.
  • Page 89 A calibration factor in the range of 1% to 150% can be entered. The following NOTE rules apply to naming sensor calibration tables: – The name must consist of no more than 12 characters. – Space is not allowed as the first character. Keysight N432A User’s Guide...
  • Page 90 If you measure a signal with a frequency outside the frequency range defined in the sensor calibration table, the N432A uses the highest or lowest frequency point in the sensor calibration table to calculate the offset.

  • Page 91: Power Measurement Procedures

    N432A. 1 Preset the N432A to its default state by pressing 2 Connect a thermistor sensor to the channel A input connector of the N432A. 3 A message will appear to inform you of the current bridge resistance value and require you to select a new resistance value or reconfirm the current resistance value.
  • Page 92 COMP This method helps to reduce measurement error to ± (0.2%+0.5 μW). To use this method, first you need to perform zeroing of the N432A and measure its V and V outputs using external digital multimeters. These V...
  • Page 93 1 Preset the N432A to its default state by pressing 2 Set up the following connections in which the HI and LO terminals of two Keysight 3458A digital multimeters are connected to the N432A rear panel V and V outputs.
  • Page 94 3 Turn off or disconnect the RF power from the thermistor sensor. 4 Upon connecting the sensor to the N432A channel A, a message will appear to inform you of the current bridge resistance value and require you to select a new resistance value or reconfirm the current resistance value.
  • Page 95 V COMP COMP equivalent to V and V . Calculate V , which is equivalent to V – COMP1 COMP1 13 Compute the RF power using the following equation: – – COMP0 COMP1 ------------------------------------------------------------------------------------------------------ - 4Rε Keysight N432A User’s Guide...

  • Page 96: Voltage Standing Wave Ratio (Vswr) Measurement

    P and P respectively (but the available power remains the same) then the two relationships can be equated as follows: 1 Γ Γ 1 Γ Γ – – -------------------------- -------------------------- Γ Γ – – Keysight N432A User’s Guide...
  • Page 97 The following procedure describes how to measure the VSWR of a source. 1 Preset the N432A to its default state by pressing 2 Connect a thermistor sensor to the channel A input connector of the N432A. 3 A message will appear to inform you of the current bridge resistance value and require you to select a new resistance value or reconfirm the current resistance value.
  • Page 98 13 Round off the DVM reading to two decimal places. Record this value as the first internal bridge resistance, R , of the N432A. 14 Power on the N432A and set the bridge resistance to 100 Ω. Then, power off the N432A. Keysight N432A User’s Guide...
  • Page 99 R , of the N432A. 16 Power on the N432A again and connect the sensor to channel A. A message will appear to inform you of the current bridge resistance value and require you to select a new resistance value or reconfirm the current resistance value. Use the softkeys to select a value of 200 Ω.
  • Page 100 Oscillator Figure 2-46 Connection diagram for VSWR measurement Prior to proceeding with the following steps, ensure that the N432A and the NOTE power meter-under-test have been switched on for at least 30 minutes. 23 Preset the power meter-under-test. Ensure that its oscillator/power reference is turned off.
  • Page 101 – – COMP0 COMP1 ------------------------------------------------------------------------------------------------------ - 29 Now, set the N432A bridge resistance to 100 Ω. Again, set up the connections shown in Figure 2-46. 30 Repeat steps 26 to 28. 31 Compute the power measured from the oscillator, P...

  • Page 102: Blank Screen

    Blank Screen The blank screen feature enables you to blank the whole display screen. This feature ensures that the N432A display is not shown to casual observers. To restore the display, press any key on the front panel. 1 of 2...

  • Page 103: Secure Blank

    Display 3 Press . The Enter 6-digit Password pop-up will appear as shown Secure Blank Figure 2-49. You need to enter a 6-digit password upon activating the secure blank feature. Figure 2-49 Enter 6-digit Password pop-up Keysight N432A User’s Guide...
  • Page 104 Reconfirm Password pop-up (Figure 2-49) re-appears. Figure 2-52 Warning message 8 When the correct password is successfully entered for the second time, you will be prompted for confirmation before the screen is blanked. Press Confirm Keysight N432A User’s Guide...
  • Page 105 10 Upon an unsuccessful third attempt, you will need to wait for two hours with the N432A powered on before you can re-enter the password. You are then allowed up to three attempts of password entry again. The whole cycle of password entry will then be repeated.

  • Page 106: Backlight Intensity Control

    1 of 2 Backlight Figure 2-55 Backlight intensity control feature Press to increase the backlight brightness. Brightness + Press to decrease the backlight brightness. Brightness – Figure 2-56 Increase or decrease the backlight brightness Keysight N432A User’s Guide...

  • Page 107: Memory Erase/Secure Erase

    Memory Erase/Secure Erase The memory erase and secure erase features will erase the SRAM and flash file system. The flash file system includes the N432A states, calibration factor tables, frequency-dependent offset tables, and a secure blank password stored in EEPROM. Upon completion, the N432A contents will be initialized to the default settings.
  • Page 108 2 A confirmation pop-up dialog will appear as shown below. Press Confirm begin secure erase. Figure 2-59 Confirmation to begin secure erase 3 The following warning message will appear to inform you of the progress status. Figure 2-60 Warning message displaying the secure erase status Keysight N432A User’s Guide...

  • Page 109: Warm Start

    SCPI. The default setting is On. Warm start ON All the current states and settings configured via the front panel or SCPI will be saved. The N432A will be powered on with the states and settings before it was powered off. Warm start OFF The N432A will be powered on with the default states and settings.
  • Page 110 THE PAGE HAS BEEN INTENTIONALLY LEFT BLANK Keysight N432A User’s Guide...

  • Page 111: Maintenance

    Keysight N432A Thermistor Power Meter User’s Guide Maintenance Self-Test Error Messages Operator Maintenance Contacting Keysight Technologies Erasing Memory Data Returning the N432A for Service This chapter describes the built-in tests, error messages, and general maintenance.

  • Page 112: Self-Test

    Self-Test The N432A troubleshooting mode self-test can be accessed via the front panel or remotely. The front panel softkey menu allows you to run individual test, whereas the remote command runs a full instrument self-test as listed in “Remote testing”...
  • Page 113 If you cancel the sensor disconnect confirmation with the sensor still connected, tests for V , and V will be skipped and displayed as shown below. COMP Keysight N432A User’s Guide...
  • Page 114 This section specifies what is actually checked by each of the tests. Some of the tests may only be applicable to one method of invocation (for example, from the front panel). If this is the case, it is specified in the test description. Most of the Keysight N432A User’s Guide...
  • Page 115 , and V . The built-in COMP self-test circuit will output a set of known DC voltages to the bridge which are then compared to those measured by the N432A metering. This is a user-invoked self-test. Keysight N432A User’s Guide...

  • Page 116: Error Messages

    If there is any error in the error queue, the front-panel error indicator is displayed as shown in the figure below. Other errors can also be generated when the N432A is being operated over the remote interface. These errors also display the error indicator and are written to the error queue.
  • Page 117 Error List Clear Error To delete all the errors in the queue remotely, use: – the *CLS (clear status) command. The error queue is also cleared when the N432A power has been switched off. Keysight N432A User’s Guide...
  • Page 118 Example: SENSeAVERageCOUNtVOLTage AVC8 Undefined header A command was received that is not valid for the N432A. You may have misspelled the command, it may – 113 not be a valid command, or you may have selected the wrong interface. If you are using the short form of the command, remember that it may contain up to four letters.
  • Page 119 – 161 A block data element was expected but was invalid for some reason, for example, *DDT #15FET. The 5 in the string indicates that five characters should follow, whereas in this example there are only three. Keysight N432A User’s Guide...
  • Page 120 Table 3-1 Error list Block data not allowed – 168 A legal block data element was encountered but not allowed by the N432A at this point Example: SYST:COMM:GPIB:ADDR #15FETC? Expression data not allowed – 178 A legal expression data was encountered but not allowed by the N432A at this point...
  • Page 121 Error list Data corrupt or stale This occurs when a FETC? is attempted and either a reset has been received or the N432A state has – 230 changed such that the current measurement is invalidated (for example, a change of frequency setting or triggering conditions) Data questionable;Input Overload...
  • Page 122 *RST (reset) command has been executed. Query UNTERMINATED The N432A was addressed to talk (that is, to send data over the interface) but a command which sends – 420 data to the output buffer has not been received. For example, you may have executed a CONFigure command (which does not generate data) and then attempted to read data from the remote interface.

  • Page 123: Operator Maintenance

    The power line fuses are located within the N432A fuse holder assembly on the rear panel. For all voltages, the N432A uses 250 V, T2.5 H, 20 mm slow blow fuses with high breaking capacity.

  • Page 124: Contacting Keysight Technologies

    Technologies. This chapter contains a checklist that will help identify some of the most common problems. If you wish to contact Keysight Technologies to enquire about the N432A, from service problems to ordering information, refer to “Sales and Technical Support”...
  • Page 125 This ensures you obtain the most complete and accurate service information. The serial number can be obtained via the following: – querying the N432A over the remote interface using the *IDN? command. – from the front panel by pressing >...
  • Page 126 – The suffix indicates an alphanumeric code which is used to ensure unique identification of each product throughout Keysight Technologies. SERIAL NUMBER SER MY12345678 MADE IN MALAYSIA Recommended calibration interval Keysight Technologies recommends a one-year calibration cycle for the N432A. Keysight N432A User’s Guide...

  • Page 127: Erasing Memory Data

    Erasing Memory Data This section explains how to erase the N432A memory, for example, before you return the N432A to Keysight Technologies for repair or calibration, of all data stored in it which includes the save/recall and last power-on states.

  • Page 128: Returning The N432A For Service

    The carton must be large and strong enough to accommodate the N432A and allow at least 3 to 4 inches on all sides of the N432A for packing material. – Surround the N432A with at least 3 to 4 inches of packing material, or enough to prevent the N432A from moving in the carton.
  • Page 129 Keysight N432A Thermistor Power Meter User’s Guide Specifications and Characteristics Introduction N432A Specifications Rear Panel Input and Output Connections 1 mW Power Reference Environmental Conditions Physical Characteristics This chapter describes the specifications and characteristics of your N432A.

  • Page 130: Specifications And Characteristics

    Characteristic specifications Supplemental characteristics which are specified in italics are intended to provide information useful in applying to the N432A by giving typical, but non-warranted performance parameters. These characteristics are specified in italics or denoted as “typical”, “nominal”, or “approximate”.
  • Page 131 – stored for a minimum of two hours at a stable temperature within the operating temperature range, and turned on for at least 30 minutes. – the N432A and the thermistor sensor are within their recommended calibration periods. – used in accordance to the information provided in this guide.

  • Page 132: N432A Specifications

    Display resolutions – Power: Selectable resolutions of 1, 0.1, 0.01, and 0.001 dBm in logarithmic mode, or 1, 2, 3, and 4 significant digits in linear mode – Voltage: 6.5-digit resolution – Bridge resistance: 6.5-digit resolution Keysight N432A User’s Guide...

  • Page 133: Rear Panel Input And Output Connections

    Line power 100 – 240 V , automatic selection Input voltage range 220 – 240 V ±10% 50 – 60 Hz, 400 Hz Input frequency range 400 Hz (100 – 120 Vac) Power requirement 70 VA Keysight N432A User’s Guide...

  • Page 134: Mw Power Reference

    1.08 maximum Connector type Type N (f), 50 W Environmental Conditions General The N432A complies with the requirements of the EMC Directive 89/336/EEC. The N432A is designed for indoor use only. Operating environment Operating temperature C to 55 Operating humidity 95% RH up to 40°C, decreases linearly to 45% RH at 55°C, non-condensing.

  • Page 135: Physical Characteristics

    The following dimensions exclude front and rear panel protrusions: – 212.6 mm W x 88.5 mm H x 348.3 mm (8.5 in x 3.5 in x 13.7 in) Weight Weight (net) ≤ 3.70 kg (approximately) Weight (shipping) ≤ 8.30 kg (approximately) Keysight N432A User’s Guide...
  • Page 136 THE PAGE HAS BEEN INTENTIONALLY LEFT BLANK Keysight N432A User’s Guide...
  • Page 137 This information is subject to change without notice. Always refer to the English version at the Keysight website for the latest revision. © Keysight Technologies 2006-2020 Edition 6, December 8, 2020 Printed in Malaysia N432A-90002 www.keysight.com...

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