Newport 2835-C Manual
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Newport 2835-C Manual

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Newport 2835-C Manual

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  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 Model 2835-C Multi-Function Optical Meter Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 3 Model 2835-C Multi-Function Optical Meter Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 4: Warranty

    Warranty Newport Corporation warrants this product to be free from defects in material and workmanship for a period of 1 year from the date of shipment. If found to be defective during the warranty period, the product will either be repaired or replaced at Newport’s option.

  • Page 5: Ec Declaration Of Conformity

    EC DECLARATION OF CONFORMITY Model 2835-C We declare that the accompanying product, identified with the " " mark, meets the intent of the Electromagnetic Compatibility Directive, 89/336/EEC and Low Voltage Directive 73/23/EEC. Compliance was demonstrated to the following specifications: EN50081-1 EMISSIONS:...

  • Page 6: Table Of Contents

    Table of Contents Warranty ......................... ii EC Declaration of Conformity ................iii List of Figures ......................vii List of Tables ......................viii Safety Symbols and Terms ..................ix Definitions ....................... x Specifications ......................xi Detector Signals and Calculations ..............xiv Section 1 - General Information System Overview ..................
  • Page 7 Making a Signal Integration Measurement ........ 26 2.8.5 Measuring a Laser Pulse Energy with a Thermopile Detector .. 26 2.8.6 Using the Model 2835-C as an Exposure Controller ....27 Section 3 - Principles of Operation 3.1 Introduction .................... 29 3.2 Analog Signal Flow .................. 29 3.3 Digitized Signal Flow ................
  • Page 8 GPIB Communication ................43 4.6.1 Setting the GPIB Address ............43 Section 5 - Remote Command Reference Model 2835-C Remote Interface Commands ......... 44 Device Independent Commands ............46 Device Dependent Commands............... 57 Section 6 - Maintenance, Test and Troubleshooting Maintenance Procedures ...............

  • Page 9: List Of Figures

    Rear Panel Power Supply Voltage Switches in Positions L, R ..... 23 Connecting a Detector with its Calibration Module ......24 Model 2835-C Detector Calibration Module Input Port ......24 Measuring Laser Pulse Energy via a Thermopile in INTG Mode ..27 Model 2835-C Analog Signal Flow Diagram ...........
  • Page 10 List of Tables Table 1. Model 2835-C Display Annunciators ..........5 Table 2. Model 2835-C Top Level Key Functions and Associated Remote Commands ............... 6 Table 3. Newport Detector Families and Available Measurement Modes . 10 Table 4. Model 2835-C Measurement Modes ........... 11 Table 5.

  • Page 11: Safety Symbols And Terms

    42VDC or 42V peak AC. Do not exceed 42V between any portion of the Model 2835-C (or any attached detector or probe) and earth ground or a shock hazard will result.

  • Page 12: Definitions

    Definitions amps alternating current analog-to-digital converter battery option biconic fiber connector standard coaxial connector type degrees Centigrade direct current degrees Fahrenheit femtoamps hertz (cycles per second) current-to-voltage converter kilohertz least significant digit kiloOhms milliamps millivolts nanoamps nanofarads nanometers picoamps peak-to-peak relative humidity serial number µA...

  • Page 13: Specifications

    Specifications Physical Specifications: Dimensions: 4.2 x 8.8 x 13.9 in (107 x 224 x 353 mm) Weight: 8 lb, 3 oz (3.7 kg) Enclosure: Metal case, painted Connectors: (2) 8-Pin Sub Mini DIN CAL MODULE Inputs; (2) BNC Analog Outputs, Trigger Output and Trigger Input;...
  • Page 14 Electrical Specifications: DC Current Measurement (Low-Power, Semiconductor Photodiode CAL MODULE) Signal Range: Full-Scale Current: 2.51 nA 25.1 nA 251 nA 2.51 µA 25.1 µA 251 µA 2.50 mA A/D Resolution: 126 fA 1.26 pA 12.6 pA 126 pA 1.26 nA 12.6 nA 126 nA (20,000 Count Precision)
  • Page 15 D.C. Voltage Measurement (Thermopile CAL MODULE) Signal Range: 1, 2 Full Scale Voltage: 2.49 mV 24.9 mV 249 mV 2.49 V (20,000 Count Precision) Resolution: 125 nV 1.25 µV 12.5 µV 125 µV (20,000 Count Precision) ≤ 8 LSD ≤ 1 LSD ≤...

  • Page 16: Detector Signals And Calculations

    Detector Signals and Calculations: Represents the most recent signal value ob- tained from the A/D converter. It may represent amps or volts and may be analog and or digitally filtered. Represents the value stored as a reference signal for subsequent use in signal offset, i.e. ZERO calculations.

  • Page 17: Section 1 - General Information

    Great flexibility exists within the command structure of the Model 2835-C so that even complex measurements can be set up quickly and easily. The 2835-C can react to or provide triggering, act as an exposure or noise meter, or data log up to 1,000 measurements per channel! The Model 2835-C is compatible with all of Newport’s Low-Power, High-Power...

  • Page 18: Scope Of This Manual

    The Model 2835-C connects to detectors through a calibration module con- taining information unique to the detector being used. Calibration modules are ordered with a detector at the time of purchase and are labeled with the detector’s model number and serial number. Detectors with calibration modules have a “/CM”...

  • Page 19: Preparation For Use

    The Newport Catalog presents up-to-date information on detectors, detector accessories and detector calibration services available for use with the Model 2835-C. Refer to Figure 1 for the Model 2835-C family tree of accessories. Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 20: Section 2 - System Operation

    System Operation Introduction The Model 2835-C is designed to provide quick operation and to avoid a steep learning curve. This section starts by giving a brief listing of display, key pad and menu command features. Much of the Model 2835-C’s operation will be obvious after these descriptions.

  • Page 21: Top Level Key Functions

    Top Level Key Functions Operating controls for the Model 2835-C are found on both the front and rear panels of the Model 2835-C. For measurement operation, only the front panel controls are used. Rear panel controls are used for AC line power setup, Section 2.5.

  • Page 22: Front Panel Key Pad

    Figure 3 – Front Panel Key Pad Table 2 – Top Level Key Functions and Associated Remote Commands Keypad Remote Commands Description None Turns the Model 2835-C on and off. SHIFT None Enables the blue key functions. DISP DISP, DISP? Cycles display brightness: OFF,LOW,NORM and HIGH.

  • Page 23: Power

    2.3.1 , Power key toggles the Model 2835-C on and off. To turn the meter on, depress key in until it clicks and stays in its depressed position. To turn the meter off, press the key again until it clicks and rebounds to its original length.

  • Page 24: Zero, Offset Subtraction

    2.3.5 ZERO, Offset Subtraction This key turns offset subtraction on and off. When turned on, the ZERO annunciator lights and the last signal reading is saved as S and subtracted from all subsequent signal readings S. This causes subsequent signal calcula- tions (and the display) to use the value S-S instead of S.

  • Page 25: Ref Sel, Reference Select

    2.3.9 REF SEL, Select Reference The REF SEL key is used to select the reference value, Dref, to be used for relative, REL, and logarithmic relative, dB, unit readings. Press the REF SEL key to display the reference source in the message display area. The EDIT annunciator will be lit and the current selection will blink.

  • Page 26: R/S, Run-Stop

    Otherwise the channels run independent of each other. 2.3.13 MODE, Measurement Mode The Model 2835-C provides a number of measurement modes for acquiring data. At power on, the meter checks the detector’s calibration module to determine which measurement modes the detector supports. Table 3 describes the measurement modes available for each detector family.

  • Page 27: Units, Display Units

    Table 4 – Model 2835-C Measurement Modes Mode Description DC CONT Measurement occurs at a programmable sample rate, Section 2.4.7. DC SNGL A measurement is taken every time the meter receives a trigger up to a 500Hz rate when two detector calibration modules are plugged into the meter and 1000Hz for one.

  • Page 28: Stats, Moving Statistics

    Table 5 – Valid Display Units Available to Detector Families by MODE. FAMILY MODE W/cm J/cm Erg/cm Low-Power DC CONT Low-Power DC SNGL Low-Power INTG Low-Power P-P CONT Low-Power P-P SNGL High-Power DC CONT High-Power DC SNGL High-Power INTG Energy CONT PULSE Energy SNGL PULSE...

  • Page 29: Ext, External Trigger

    Press EXT to light the EXT annunciator and enable the external trigger input to both channels. The Model 2835-C will still respond to triggers from the R/S, R/S A, or R/S B keys even when the EXT trigger is enabled. Press the EXT key a second time to turn off the annunciator and disable the external trigger input.

  • Page 30: Adjust

    2.3.21 Adjust keys allow one to adjust various parameter states and values. In normal operation, the keys turn AUTO off and adjust the amplifier signal gain. In any other mode, the keys cause one to move through a list or to adjust a blinking digit. The keys zoom the bargraph ( in, out) and in edit mode, select which digit of a numerical value will blink.

  • Page 31: Table 7. Menu Level Key Functions And Parameters

    <- -> BAUD RATE 1200, 2400, 4800, 9600, 19.2K RS-232 ECHO OFF <- -> RS-232 ECHO ON, OFF GENERAL INFO <- -> MODEL 2835-C SW VERSION d.d DETECTOR INFO <- -> MODEL xxxxxx DET SN ddddd ATTN SN ddddd CAL ddMONyyyy †...

  • Page 32: Data Store

    2.4.2 Data Store The Model 2835-C allows a user to save up to 1000 measurements for each channel for a total of 2000 measurements. These measurements are stored in an internal buffer for subsequent viewing or transmission over a computer interface.

  • Page 33: Meter Configuration

    2.4.3 Meter Configuration The Model 2835-C provides a method to save the configuration of the entire meter and to recall that configuration for later use even if the meter has been turned off. This is accomplished through configuration buffers maintained in nonvolatile memory.

  • Page 34: Auto Cal

    60 minute warm-up period from power-up. Executing AUTO CAL with High Power (Thermopile) detectors: 1. With the detector connected to the 2835-C, remove the detector from the radiation source and allow a minimum of 60 seconds for the detector surface temperature to stabilize.

  • Page 35: Attenuator

    CAL is complete. NOTE: Although at Power up, an AUTOCAL is performed, the above method is necessary for proper calibration when the 2835-C is used with voltage sources. Executing AUTO CAL with Low Power (Photodiode) or Energy detectors: Simply press ENTER when AUTO CAL is displayed. The display message area will display “ONE MOMENT”, followed by a buzzer sound indicating that...

  • Page 36: Dc Sampling

    In TRIG ON CMPLT mode, a pulse is output after each reading has been acquired and completely processed from either channel. When acquiring on one channel, it indicates that the 2835-C is ready to take another reading. The width of this pulse is at least 8 µS.

  • Page 37: Trigger Input

    2.4.9 Trigger Input The Model 2835-C’s rear panel TTL external trigger input can be enabled or disabled, Section 2.3.17, and have its edge polarity set. The edge polarity is accessed via the EXT TRIGGER IN menu function and can be set to rising or falling edge triggering.

  • Page 38: Bar Graph

    ON, OFF 2.4.11 Tone The 2835-C has a speaker that can emit a short tone or tick to indicate when a peak or pulse is detected in P-P or PULSE measurement modes for the display channel. The audible output is enabled or disabled via the TONE menu function.

  • Page 39: General Information Functions

    Configure the Model 2835-C’s power supply voltage selection switches to match the nominal local voltage. See Figure 5 and Table 21. ii. Plug an AC line power cord to the rear of the Model 2835-C and then connect the cord with AC power.

  • Page 40: Detector Connection And Setup

    Insert the calibration module into the front panel input port of the Model 2835-C. An alignment pin forces the proper orientation of the calibration module.

  • Page 41: Power Up

    Power Up Turn on the Model 2835-C by depressing the front panel key until it clicks in and remains in its depressed position. The Model 2835-C will perform a power up self test and then configure itself to its last operating state. If the last operating state is not compatible with one of the current detectors, the 2835-C adopts the default configuration appropriate to this new detec-tor.

  • Page 42: Making Pulse Energy Measurements

    1. The process as described above assumes that ambient signals are not changing between when you zero the display and when you make your measurement. 2. The 2835-C will not integrate signals less than 10 pA. If your noise level is greater, the ZERO command may help (step iii). 2.8.5 Measuring a Laser Pulse Energy with a Thermopile Detector This application makes use of the Model 2835-C’s INTG mode.

  • Page 43: Using The Model 2835-C As An Exposure Controller

    Model 2835-C as an exposure meter-controller. Use the following setup and procedure: i. Connect a BNC cable between the Model 2835-C’s trigger input and trigger output BNC connectors. Using a T-connector, connect the trigger output BNC to your shutter’s external control BNC.
  • Page 44 The display now shows the final integration value from the exposure. NOTE You can also configure the Model 2835-C as an exposure timer-controller by configuring the trigger output to TRIG AT FREQ and setting the trigger frequency appropriately.

  • Page 45: Section 3 - Principles Of Operation

    These detector families are based on semiconduc- tor, thermopile and pyroelectric detectors respectively. Detector data is introduced to the Model 2835-C by way of a calibration module specific to the detector in use. At power up (and RESET), the 2835-C uploads information about the detector from the calibration module which describes the set of operating states available to the detector.

  • Page 46: Digitized Signal Flow

    The digital filter is reset when the Model 2835-C is turned on and whenever the UNITS or the range changes or when the MODE key is pressed.

  • Page 47: Typical Detector Signals

    Typical Detector Signals The flexibility of the Model 2835-C analog signal flow is required in order that it may properly measure the signals that various types of detectors make.

  • Page 48: Thermopile Detector Signals

    Pyroelectric (Newport Energy) detectors, deliver a peak voltage signal, . The 2835-C is capable of capturing 2 µsec rise time voltage spikes so that it may operated with the fastest of these detectors. Thermopile Detector Signals Thermopile detectors respond with a voltage signal that slowly to changes in incident optical power.

  • Page 49: Peak-To-Peak (Photodiode) Detector Signals

    To make a peak-to-peak measurement, the Model 2835-C must be able to capture both the maximum and minimum values of a detector signal. This is accomplished by AC coupling the incoming detector signal so that the original minimum value shows up as a negative peak.

  • Page 50: Integration Of Detector Signals

    The most common are: DC power, peak power, and peak-to-peak power. The Model 2835-C can only measure periodic AC peak-to-peak signals within the frequency range: 50 - 7,000 Hz. Above 7,000 Hz, bandwidth limitations significantly effect the accuracy of the peak-to-peak measurement.

  • Page 51: Analog Output

    Analog Output The Model 2835-C provides a 0 to 2.5 volt, into 50W,BNC analog output for signal monitoring. The analog output is the actual amplified detector signal and is uncorrected for the effects of the detector’s responsivity, AUTO CAL, and ZERO.

  • Page 52: Measurement Considerations

    3.10.1 Detector Calibration and Accuracy Newport Corporation calibrates its detectors using secondary standards directly traceable to the United States National Institute of Science and Technology (NIST) or to Great Britain’s National Physical Laboratory (NPL).

  • Page 53: Thermopile Detector Temperature Effects

    3.10.4 Energy Detector Temperature Effects Pyroelectric (Newport Energy) detectors are AC coupled devices and thus are not susceptible to temperature induced DC signal offsets or noise floor changes. One generally does not need to take much precaution with pyroelectric detec- tors except to make sure that their damage threshold is not exceeded.

  • Page 54: Common Measurement Errors

    NOTE The Model 2835-C will indicate when a detector is being operated above its saturation or damage threshold by displaying “SA” in the measurement display area. Be aware that detectors often experience local saturation or damage without ever exceeding an overall saturation or damage threshold.

  • Page 55: Section 4 - Computer Interfacing

    (*). Device dependent commands do not start with an asterisk and have meanings unique to the Model 2835-C. A query is a com- mand that invokes a response from the meter. All queries are terminated by a question mark (?).
  • Page 56 RS-232C normal mode the <NL> character terminates the response. GPIB Response Termination All responses from the 2835-C GPIB port are terminated by an <END> se- quence. Which is the concurrent transmission of <EOI> with a <NL> data byte. Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 57: Entering Remote Computer Interface Mode

    Data bits Stop bits When the echo mode is enabled the 2835-C generates a ‘> ‘ prompt for every new line and all characters sent to the 2835-C are echoed back over the interface. Error messages are reported over the interface immediately. As the...

  • Page 58: Setting Baud Rate And Echo Mode From The Keypad

    TO 2835 TO COMPUTER CABLE TERMINATORS (RS-232) 9 pin to 25 pin 9 PIN 25 PIN PIN NO. CODE DESCRIPTION PIN NO. CARRIER DETECT RECEIVE DATA TRANSMIT DATA DATA TERM. READY SIGNAL GROUND DATA SET READY REQUEST TO SEND CLEAR TO SEND RING IND.

  • Page 59: Rs-232C Xon/Xoff Handshaking Protocol

    XON (ASCII encoded 17 decimal) to signal the remote computer that it can resume transmission. The 2835-C will also respond to XOFF and XON characters sent to it from the remote computer. When the 2835-C receives an XOFF character it will sus- pend all transmission of characters to the remote computer until the XON character is received.

  • Page 60: Model 2835-C Remote Interface Commands

    Section 5 Command Reference Model 2835-C Remote Interface Commands The Model 2835-C remote commands can be divided into two groupings: i. Device Independent Commands, Section 5.2 ii. Device Dependent Commands., Section 5.3 Table 25 lists the Device Independent Commands supported by the 2835-C while Table 26 lists the Device Dependent Commands supported the 2835-C.

  • Page 61: Table 26 Device Dependent Commands

    Table 26 – Device Dependent Commands Command Command Name ATTN_n Attenuator Calibration Data Enable ATTN_n? Attenuator Calibration Data Enable Query ATTNSN_n? Attenuator Serial Number Query AUTO_n Auto Ranging Enable AUTO_n? Auto Ranging Enable Query BARGRAPH Bar Graph Enable BARGRAPH? Bar Graph Enable Query CALDATE_n? Calibration Date Query Available Channel Query...

  • Page 62: Device Independent Commands

    SFREQ DC Sample Frequency Select SFREQ? DC Sample Frequency Query SPREC DC Sample Type Select SPREC? DC Sample Type Query STMAX_n? Statistics Buffer Maximum Value Query STMEAN_n? Statistics Buffer Mean Value Query STMIN_n? Statistics Buffer Minimum Value Query STMXMN_n? Statistics Buffer Maximum-Minimum Value Query STSDEV_n? Statistics Buffer Standard Deviation Query STSIZE_n...
  • Page 63 Function: This routine performs an auto calibration sequence on both channels. The calibration sequence measures the amplifier offsets at all gain settings. These measurements are stored and subtracted from subsequent measurements. Acquisition is suspended during auto calibration and no other remote com- mands will be processed until the auto calibration sequence is complete.
  • Page 64 *ESE Event Status Enable Syntax: *ESE <mask> Parameters: <mask> is an integer in the range 0 to 255 inclusive. <mask> is written to the Event Status Enable register. Function: The Event Status Enable register is AND’ed with the Event Status register. If any bit is set in the result of this AND’ing operation the ESB bit (bit 5) of the Status Byte will be set.
  • Page 65 *ESR? Event Status Register Query Syntax: *ESR? Parameters: None Function: This query returns the contents of the Event Status Register and clears the Event Status Register except for bit 3. Bit 3 is determined by the state of the Device Event and Device Event Enable registers. The *CLS command will also set this register to 0.
  • Page 66 1). Otherwise the <IST> message is set false (a value of 0). When a parallel poll is conducted with the 2835-C configured to respond to it, the <IST> message is compared to the <S BIT> (sense bit). If they are the same then the configured data line will be driven true in response to the parallel poll.
  • Page 67 Function: This command provides a means of synchronizing operations between the 2835-C and the host. This command sets the Operation Complete bit (bit 0) of the Event Status register to 1 when all pending operations have completed. This bit will remain 1 until cleared by the *CLS command or the *ESR? query.
  • Page 68 *PRE Parallel Poll Enable Syntax: *PRE <mask> Parameters: <mask> is an integer in the range 0 to 255 inclusive. The value of this number is written into the Parallel Poll Enable register. Function: This command sets the Parallel Poll Enable register bits. The Parallel Poll Enable register is used in conjunction with the Status Byte to generate the IST (Individual Status) message.
  • Page 69 *RCL Recall Meter Configuration Syntax: *RCL <config> Parameters: <config> is of type <number> which rounds to an integer in the range 0 to 9. This number specifies a configuration storage buffer. The number 0 stands for the default configuration buffer. Function: This command configures the meter to a configuration previously stored in non-volatile memory (see *SAV), or to the default configuration for the...
  • Page 70 Status Byte Register, then a service request will be generated once for the for the given event. When service is being requested, bit 6 is set in the byte returned by a serial poll of the 2835-C. The Service Request Enable Register is an 8-bit, bit mapped register, with each bit signifying a different condition.
  • Page 71 Service Request Enable Register, then a service request will be generated once for the given event. When service is being requested, bit 6 is set in the byte returned by a serial poll of the 2835-C. The Status Byte Register is an 8-bit, bit mapped register, with each bit signify- ing a different condition.
  • Page 72 Care should be taken when using this command since it is possible to overflow the input queue by continuing to write commands to the 2835-C while the *WAI command is in effect.

  • Page 73: Device Dependent Commands

    Device Dependent Commands ATTN_n Attenuator Calibration Data Enable Syntax: ATTN_n <state> where n is either A or B Parameters: The parameter <state> is either 0 or 1. If <state> is 0, then detector responsivity data is used to calculate readings. If <state> is 1, then the detec- tor + attenuator responsivity data is used to calculate readings.
  • Page 74 ATTNSN_n? Attenuator Serial Number Query Syntax: ATTNSN_n? where n is either A or B Parameters: None Function: This query returns the serial number of the attenuator that was calibrated with the attached detector. When using an attenuator this serial number must match the serial number of the attenuator being used or data calculations will be inaccurate.
  • Page 75 A or B Parameters: None Function: This query returns the calibration date of the detector as read from the memory module attached to the 2835-C. Returns: <model> <model> is of type <string> in the double quote format. Related Commands: ATTNSN_n?, DETMODEL_n?, DETSN_n?
  • Page 76 This query returns the serial number of the detector that belongs to the memory module attached to the specified channel. This serial number must match the serial number of the detector attached to the 2835-C. Returns: <detSN> <detSN> is of type <string> in the double quote format.
  • Page 77 Syntax: DETSW_n? where n is either A or B Parameter: None Function: This query returns the switch setting assumed by the 2835-C. This setting must match the actual switch setting on the detector or readings will be inaccurate. Returns: <setting>...
  • Page 78 DISP? Display Brightness Query Syntax: DISP? Parameters: None Function: This query returns the brightness level of the display. Returns: <level> <level> is of type <number> where 0 corresponds to off, 1 to dim, 2 to normal, and 3 to bright. Related Commands: DISP DISPCH Display Channel Select...
  • Page 79 DS_n? Data Store Value Query Syntax: DS_n? <number> where n is either A or B Parameters: The parameter <number> rounds to an integer and represents the data store value that is being queried. The range of <number> is 1 to n; where n is the number of values stored in the data store buffer (see DSCNT_n?).
  • Page 80 DSBUF_n? Data Store Buffer Behavior Query Syntax: DSBUF_n? where n is either A or B Parameters: None Function: This query returns a value showing whether data store FIXED BUFFER or SLIDE BUFFER behavior is enabled. Returns: <state> <state> is of type <number> and represents an integer 0, if FIXED BUFFER behavior is enabled, or 1, if data store SLIDE BUFFER behavior is enabled.
  • Page 81 DSE_n Data Store Enable Syntax: DSE_n <state> where n is either A or B Parameters: The parameter <state> is a <number> which is either 0 or 1. If the number is 0, data storing is disabled. If the number is 1, data storing is enabled. Function: This command enables or disables data storing.
  • Page 82 DSSIZE_n? Data Store Buffer Size Query Syntax: DSSIZE_n? where n is either A or B Parameters: None Function: This query returns the data store buffer size. Returns: <size> <size> is of type <number> and represents an integer of the range 1 to 1000. Related Commands: DS_n?, DSCLR_n, DSCNT_n?, DSE_n, DSE_n?, DSSIZE_n, DSUNITS_n?, DSBUF_n, DSBUF_n?, DS_n DSUNITS_n?
  • Page 83 ECHO? RS-232 Echo Mode Enable Query Syntax: ECHO? Parameters: None Function: This query returns a value showing whether the RS-232 echo mode is enabled or disabled. Returns: <state> <state> is of type <number> that represents the integer 0, if the echo mode is disabled, or 1, if the echo mode is enabled.
  • Page 84 EVENTEN Device Event Enable Register Syntax: EVENTEN <mask> Parameters: <mask> is an integer in the range 0 to 255 inclusive. The value of this number is written into the Device Event Enable register. Function: The Device Event Enable register is AND’ed with the Device Event register. If any bit is set in the result of this AND’ing operation then Device Error bit (bit 3) in the Standard Event Status register will be set.
  • Page 85 EXT? External Trigger Enable Query Syntax: EXT? Parameters: None Function: This query returns a value showing whether the external trigger input is enabled or disabled. Returns: <state> <state> is of type <number> that represents the integer 0, if the external trigger input is disabled, or 1, if the external trigger is enabled.
  • Page 86 FILTER_n Filter Select Syntax: FILTER_n <filter> where n is either A or B Parameters: The parameter <filter> is an integer in the range 0 to 3 inclusive. 0 corre- sponds to no filtering, 1 to analog filter only, 2 to digital averaging filter only, and 3 to analog and digital filters combined.
  • Page 87 Parameters: None Function: This query returns the wavelength that corresponds to the responsivity calibra- tion point currently being used by the 2835-C in measurement calculation. Returns: <wavelength> <wavelength> is of type <number> and represents an integer. The units of <wavelength> are nanometers.
  • Page 88 LLO? Local Lockout Enable Query Syntax: LLO? Parameters: None Function: The query returns the state of the local lockout. Returns: <state> <state> is of type <number> and represents the integer 0, if local lockout is disabled, or 1, if local lockout is enabled. Related Commands: LLO MODE_n Acquisition Mode Select...
  • Page 89 Read Both Channels Measurement Query Syntax: R? Parameters: None Function: This query returns the last valid measurements taken from both channels. The units of the measurements are the units defined at the time the readings were made. Because it is possible to make this query faster than measure- ments are actually being taken, the values returned by successive queries may be multiple reports of a single measurements.
  • Page 90 RANGE_n Signal Range Select Syntax: RANGE_n <range> where n is either A or B Parameters: The parameter <range> is of type <number>. The range of this parameter will depend on the detector and mode being used to acquire data. See the section entitled “Electrical Specifications”...
  • Page 91 A or B Parameters: None Function: This query returns the responsivity value currently being used by the 2835-C in measurement calculation. Returns: <val> <val> is of type <number> and represents a floating point number. The units of the responsivity <val>...
  • Page 92 RUN_n Start Single Channel Acquisition Syntax: RUN_n Parameters: None Function: This command initiates data acquisition on the specified channel using the currently defined acquisition mode. In single type acquisition modes this command will cause one reading to be acquired. In continuous type acquisi- tion modes this command will initiate the continuous acquisition of readings.
  • Page 93 RWS_n? Read Single Channel Measurement With Status Query Syntax: RWS_n? Parameters: None Function: This query returns the last measurement taken from the specified channel. The units of this measurement are the units defined at the time the reading was made. Because it is possible to make this query faster than measure- ments are actually being taken, the values returned by successive queries may be multiple reports of the same measurement.
  • Page 94 4096. Function: The 2835-C has a 20,000 count high precision A/D and a 4,096 count A/D. This command determines which of these A/Ds will be used from both channels to acquire samples during DC single and DC continuous acquisition modes. This command affects the available range of DC sample frequencies.
  • Page 95 STMAX_n? Statistics Buffer Maximum Value Query Syntax: STMAX_n? where n is either A or B Parameters: None Function: This query returns the maximum value in the statistics buffer of the specified channel. Returns: <max> <max> is of type <number> in exponent notation. Related Commands: STMEAN_n?, STMIN_n?, STMXMN_n?, STSDEV_n?, STSIZE_n, STSIZE_n?, STMEAN_n?
  • Page 96 STMXMN_n? Statistics Buffer Max-Min Query Syntax: STMXMN_n? where n is either A or B Parameters: None Function: This query returns the difference between the maximum and minimum readings in the statistics buffer of the specified channel. Returns: <mxmn> <mxmn> is of type <number> in exponent notation. Related Commands: STMAX_n?, STMEAN_n?, STMIN_n?, STMXMN_n, STSIZE_n, STSIZE_n? STSDEV_n?
  • Page 97 STSIZE_n? Statistics Buffer Size Query Syntax: STSIZE_n? where n is either A or B Parameters: None Function: This query returns the statistics buffer size. Returns: <size> <size> is of type <number> and represents an integer in the range 0 to 100. Related Commands: STMAX_n?, STMEAN_n?, STMIN_n, STMXMN_n?, STSDEV_n?, STSIZE_n STOP...
  • Page 98 STOREF_n? Store Reference Reading Query Syntax: STOREF_n? where n is either A or B Parameters: None Function: This query returns the latest reading stored as a reference reading. The units of the reference reading defaults to Watts for Low-Power and High-Power detectors and Joules for Energy detectors.
  • Page 99 TONE? Tone Enable Query Syntax: TONE? Parameters: None Function: This query returns a value indicating whether the tone feature is not available, enabled or disabled. Returns: <state> <state> is a <number> which can be -1, 0 or 1. If -1 then the tone feature is not available for the detector in use.
  • Page 100 TRIGOUTFREQ Trigger Out Frequency Select Syntax: TRIGOUTFREQ <freq> Parameters: The parameter <freq> is of type <number>. The range of this number is 0.001 to 1000Hz. Function: This command is used to set the frequency at which a pulse is output, on the TTL OUT line, in trigger out frequency mode.
  • Page 101 TRIGOUTINTG? Trigger Out Integration Level Query Syntax: TRIGOUTINTG? Parameters: None Function: This query returns the trigger out integration energy level at which the trigger out will become inactive if using the trigger out in integration acquisition mode. Returns: <level> <level> is of type <number> in exponent notation with units of joules. Related Commands: TRIGOUT, TRIGOUT?, TRIGOUTFREQ, TRIGOUTFREQ?, TRIGOUTINTG, TRIGOUTLVL, TRIGOUTLVL?, TRIGOUTPOL, TRIGOUTPOL? TRIGOUTLVL...
  • Page 102 TRIGOUTPOL Trigger Out Polarity Select Syntax: TRIGOUTPOL <state> Parameters: The parameter <state> is a <number> which can be 0 or 1. If the number rounds to 0, then the polarity will be active low. If the number is 1, then the polarity will be active high.
  • Page 103 UNITS_n Units Select Syntax: UNITS_n <units> where n is either A or B Parameters: <units> is of type <string>. All possible values of units are listed below: “V” specifies volts “A” specifies amps “W” specifies watts “W/cm” specifies watts/cm “dBm” specifies dBm “dB”...
  • Page 104 USRCAL_n User Calibration Enable Syntax: USRCAL_n <state> where n is either A or B Parameters: The parameter <state> is a <number> which can be 0 or 1. If the number is 0, then user calibration is disabled. If the number is 1, then user calibration is enabled.
  • Page 105 Parameters: None Function: This query returns the user defined responsivity factor that will be used by the 2835-C in measurement calculation when user calibration is enabled. Returns: <val> <val> is of type <number> and represents a floating point number. The units of <val>...
  • Page 106 ZERO_n Signal Zeroing Enable Syntax: ZERO_n <state> where n is either A or B Parameters: The parameter <state> is a <number> which can be 0 or 1. If the number is 0, then readings are not adjusted by the stored zero reference. If the number is 1, then readings are adjusted by the stored zero reference.

  • Page 107: Section 6 - Maintenance, Test And Troubleshooting

    Power Up Self Test The Model 2835-C executes a system self test after every power up or reset and indicates on the display whether the self test has been passed. If the self test is not passed the display will indicate one of the following error messages: “CAL MODULE A”...

  • Page 108: Troubleshooting Guide

    The following troubleshooting guide is intended to isolate and solve problems with the power meter so that, to the greatest extent possible, the return of the power meter/detector system to Newport will be unnecessary. For the problems that cannot be resolved with information in this manual, or for other situations that are not covered in this section, please see Section 7 for details on returning your entire system to Newport for service.
  • Page 109 CAL MODULE. If the first CAL MODULE does not work after proper seating and reset, but the second CAL MODULE works, call Newport Customer Service and arrange for a repair of the first CAL MODULE. If neither the first or second CAL MODULE works, call Newport Customer Service and arrange for a meter repair.

  • Page 110: Section 7 - Factory Service

    Instrument serial number (On rear panel) Description of the problem. If the instrument is to be returned to Newport Corporation, you will be given a Return Number, which you should reference in your shipping documents. Please fill out the service form, located on the following page, and have the information ready when contacting Newport Corporation.

  • Page 111: Service Form

    Service Form Newport Corporation U.S.A. Office: 714/863-3144 FAX: 714/253-1800 Name RETURN AUTHORIZATION # _____________________________________________________________________________________ _____________________________ Company (Please obtain prior to return of item) _______________________________________________________________________________ Address _________________________________________________________________________________ Country Date _________________________________________________________________________________ _________________________________________________________________ P.O. Number Phone Number ___________________________________________________________________________ _________________________________________________ Item(s) Being Returned: Model #...
  • Page 112 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...

  • Page 113: Syntax And Definitions

    Definition of <string> The IEEE 488.2 standard defines two types of string data. These strings are either single or double quoted. For convenience, the 2835-C also recognizes an unquoted string with certain restrictions as detailed below. Any of these forms may be used where a <string> parameter is required.
  • Page 114 (2nd string) Definition of <number> The IEEE 488.2 standard defines four different types of numeric data. The 2835-C recognizes all four types as <number>, thus any format may be used. 1. <number> defined as floating point. 2. <number> defined as binary.
  • Page 115 .12E1 2. <number> defined as binary. The 2835-C recognizes unsigned binary numbers in the range of 0 to 65535, decimal, or 0 to 1111111111111111 binary. Binary numbers are repre- sented using only the digits 0 and 1. A binary number has the following format: #B<binary>...
  • Page 116 3. <number> defined as octal. The 2835-C recognizes unsigned octal numbers in the range 0 to 65535 decimal, or 0 to 177777 octal. Octal numbers are represented using digits from 0 to 7. An octal number has the following format: #Q<octal>...

  • Page 117: Error Messages

    This error is generated when the system parser detects an invalid character in a command header. -113, “Undefined Header” This error is generated when the 2835-C does not recognize a command header. Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 118 -121, “Invalid character in number” This error indicates that a numeric parameter contains an invalid character or a character in the wrong place. The only characters allowed in a number are: 0-9 e E . + - When using the binary number format, the only characters allowed are: When using the octal number format, the only characters allowed are: 0 1 2 3 4 5 6 7 When using the hexadecimal number format, the only characters allowed are:...
  • Page 119 -286, “Configuration not compatible” This error will occur if an attempt is made to recall a system configuration that is not compatible with the detector currently attached to the meter. -287, “Configuration not available’ This error will occur if an attempt is made to recall a system configuration that has not been saved to and is therefore not available.

  • Page 120: Status Reporting System

    Appendix C Status Reporting System On this page is a graphical representation of the status reporting system for the GPIB and RS-232 port communications. Following is a detailed description of each register and how the bits are set and reset. The interactions between registers is discussed as well as the generation of a GPIB Service Requests.
  • Page 121 Device Event Register The Device Event Register is used to record device errors associated with some system condition that affects the operation of the meter. When a bit is set (has a value of one) then the condition is true. The bit remains set until cleared by the EVENT? query or *CLS command.
  • Page 122 7: Power On Not used by the 2835-C. bit 6: User Request Not used by the 2835-C. bit 5: Command Error A 1 in this bit indicates that the 2835-C has received a remote command that generated a command error. bit 4: Execution Error A 1 in this bit indicates that the 2835-C has received a remote command that generated an execution error.
  • Page 123 The Status Byte register is used to record a summary of current system conditions for the status reporting system. It is returned to the controller when a serial poll of the 2835-C is conducted or when the *STB? query is issued.The register is bit mapped, meaning that each condition is represented by a bit.
  • Page 124 bit 4: Message Available The Message Available MAV bit becomes set when any message is ready to be transmitted over the GPIB interface (not the RS-232 inter- face). Once the message is sent, the MAV bit is cleared. A GPIB device clear command will clear the output queue and, as a result, this bit.

  • Page 125: Sample Programs

    ‘This program is designed to show you how to write a simple ‘program that will write commands and read query responses to and ‘from the 2835-C Multi-Function Optical Meter via the RS-232 port on the ‘Rear Panel and the RS-232 port on an IBM PC/AT or compatible. The ‘Program was written in MICROSOFT GWBASIC on an IBM AT compatible.
  • Page 126 5000 ‘Read.RS232.String: Read a string from the 2835-C RS232 port. 5010 ‘Characters are read one at a time until a <LF> character is 5020 ‘read or 8 seconds elapse between consecutive character reads. 5030 ‘At the end of the routine the string read is in RS232IN$.
  • Page 127 Example Program IEEE-488 Communication ‘*********************** Program Header ******************************* ‘NEWPORT CORPORATION ‘2835-C to IEEE-488 Communication Program - an example program ‘ ‘The following program is designed to be an example of how to write a simple ‘program that will write commands and read query responses to and from ‘the 2835-C Multi-Function Optical Meter via the IEEE-488 port.
  • Page 128 ‘Append a <LF> to IEEEout$ CALL IBWRT(device.number%, IEEEout$) ‘Write IEEEout$ to IEEE-488 port RETURN ‘Read.IEEE.String: Read a string from the 2835-C IEEE port. The string ‘ read from the IEEE-488 port is printed on the screen. If the MAV bit ‘...
  • Page 129 Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com...
  • Page 130 1791 Deere Avenue Irvine, CA 92606 (In U.S.): 800-222-6440 Tel: 949-863-3144 Fax: 949-253-1680 Internet: sales@newport.com Visit Newport Online at: http://www.newport.com Newport Corporation, Irvine, California, has P/N 20303-01, Rev. D been certified compliant with ISO 9001 by IN-11932 (06-00) the British Standards Institution.
  • Page 131 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...

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