Agilent Technologies 34970A Service Manual
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Agilent Technologies 34970A Service Manual

Data acquisition/switch unit
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A g i l e n t 3 4 9 7 0 A
Data Acquisition/Switch Unit
S e r v i c e G u i d e

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Summary of Contents for Agilent Technologies 34970A

  • Page 1 A g i l e n t 3 4 9 7 0 A Data Acquisition/Switch Unit S e r v i c e G u i d e...
  • Page 2 Return the product to an and any information contained States and international copyright laws. Agilent Technologies Sales and Service herein, including but not limited to Office for service and repair to ensure the implied warranties of mer- that safety features are maintained.
  • Page 3 Note: Unless otherwise indicated, this manual applies to all serial numbers. The Agilent Technologies 34970A combines precision measurement capability with flexible signal connections for your production and development test systems. Three module slots are built into the rear of the instrument to accept any combination of data acquisition or switching modules.
  • Page 4 The Front Panel at a Glance Denotes a menu key. See the next page for details on menu operation. State Storage / Remote Interface Menus 8 Advanced Measurement / Utility Menus 2 Scan Start / Stop Key 9 Low-Level Module Control Keys 3 Measurement Configuration Menu 10 Single-Channel Monitor On/Off Key 4 Scaling Configuration Menu...
  • Page 5 The Front-Panel Menus at a Glance Several of the front-panel keys guide you through menus to configure various parameters of the instrument (see previous page). The following steps demonstrate the menu structure using the key. 1 Press the menu key. You are automatically guided to the first level of the menu.
  • Page 6 Display Annunciators Scan is in progress or enabled. Press and hold SCAN again to turn off. Monitor mode is enabled. Press again to turn off. Scanned readings, alarms, errors, or relay cycles are being viewed. VIEW Channel configuration is in progress on displayed channel. CONFIG Measurement is in progress.
  • Page 7 The Rear Panel at a Glance Slot Identifier (100, 200, 300) 4 Power-Line Fuse-Holder Assembly 2 Ext Trig Input / Alarm Outputs / Channel 5 Power-Line Voltage Setting Advance Input / Channel Closed Output 6 Chassis Ground (for pinouts, see chapter 4 in User’s Guide) 7 GPIB (IEEE-488) Interface Connector 3 RS-232 Interface Connector Use the...
  • Page 8 The Plug-In Modules at a Glance For complete specifications on each plug-in module, refer to the module sections in chapter 1. 34901A 20-Channel Armature Multiplexer • 20 channels of 300 V switching • Two channels for DC or AC current measurements (100 nA to 1 A) •...
  • Page 9 34903A 20-Channel Actuator / General-Purpose Switch • 300 V, 2 A actuation and switching • SPDT (Form C) latching relays • Breadboard area for custom circuits Use this module for those applications that require high-integrity contacts or quality connections of non-multiplexed signals. This module can switch 300 V, 1 A (50 W maximum switch power) to your device under test or to actuate external devices.
  • Page 10 34907A Multifunction Module • Two 8-bit Digital Input/Output ports, 400 mA sink, 42 V open collector • 100 kHz Totalize input with 28 bits of resolution • Two 16-bit, 12 V Calibrated Analog Outputs ± Use this module to sense status and control external devices such as solenoids, power relays, and microwave switches.
  • Page 11 1-800-452-4844 in the United States, or contact your nearest Agilent Technologies Sales Office. If your 34970A fails within one year of original purchase, Agilent will replace it free of charge. Call 1-800-829-4444 and select "Option 3" followed by "Option 1".

  • Page 12: Table Of Contents

    Contents Chapter 1 Specifications DC, Resistance, and Temperature Accuracy Specifications 16 DC Measurement and Operating Characteristics 17 AC Accuracy Specifications 18 AC Measurement and Operating Characteristics 19 Measurement Rates and System Characteristics 20 Module Specifications 21 BenchLink Data Logger Software Specifications 24 Product and Module Dimensions 25 To Calculate Total Measurement Error 26 Interpreting Internal DMM Specifications 28...
  • Page 13 Contents Chapter 4 Calibration Procedures Agilent Technologies Calibration Services 63 Calibration Interval 63 Adjustment is Recommended 63 Time Required for Calibration 64 Automating Calibration Procedures 64 Recommended Test Equipment 65 Input Connections 66 Calibration Security 67 To Unsecure the Instrument Without the Security Code 68...
  • Page 14 Contents Chapter 5 Theory of Operation System Block Diagram 119 Floating Logic 120 Memory 123 Earth-Referenced Logic 124 Power Supplies 125 Front Panel 127 Backplane 128 Analog Bus 128 Digital Bus 128 Internal DMM 129 DMM Block Diagram Input 130 Input Amplifier 131 Ohms Current Source AC Circuit...
  • Page 15 Plug-in Module Disassembly 179 Chapter 7 Replaceable Parts Replaceable Parts 182 To Order Replaceable Parts 182 34970A Mainframe 183 34970-66501 Main PC Assembly (A1) 184 34970-66502 Front-Panel and Keyboard PC Assembly (A2) 189 34970-66503 Backplane PC Assembly (A3) 190 34970-66504 Internal DMM PC Assembly (A4) 191...

  • Page 16: 34905A/34906A Rf Multiplexer Component Locator 257

    Contents Chapter 8 Schematics Agilent 34970A System Block Diagram 221 A1 Component Locator (top) 222 A1 Component Locator (bottom) 223 A1 Power Supply Schematic (Sheet 1 of 4) 224 A1 Floating Logic Schematic (Sheet 2 of 4) 225 A1 Earth Referenced Logic Schematic (Sheet 3 of 4) 226...
  • Page 17 • DC, Resistance, and Temperature Accuracy Specifications, on page 16 • DC Measurement and Operating Characteristics, on page 17 • AC Accuracy Specifications, on page 18 • AC Measurement and Operating Characteristics, on page 19 • Measurement Rates and System Characteristics, on page 20 •...

  • Page 18: Chapter 1 Specifications Dc, Resistance, And Temperature Accuracy Specifications

    Chapter 1 Specifications DC, Resistance, and Temperature Accuracy Specifications DC, Resistance, and Temperature Accuracy Specifications ± ( % of reading + % of range ) Includes measurement error, switching error, and transducer conversion error Temperature Function Range Test Current or 24 Hour 90 Day 1 Year...

  • Page 19: Dc Measurement And Operating Characteristics

    Chapter 1 Specifications DC Measurement and Operating Characteristics DC Measurement and Operating Characteristics DC Measurement Characteristics DC Operating Characteristics DC Voltage Additional Measurement Method: Continuously Integrating, Function Digits Readings/s Noise Error Multi-slope III A/D Converter DCV, DCI, and 0.6 (0.5) 0% of range ⁄...

  • Page 20: Ac Accuracy Specifications

    Chapter 1 Specifications AC Accuracy Specifications AC Accuracy Specifications ± ( % of reading + % of range ) Includes measurement error, switching error, and transducer conversion error Temperature Function Range Frequency 24 Hour 90 Day 1 Year Coefficient /°C 23 °C ±...

  • Page 21: Ac Measurement And Operating Characteristics

    Chapter 1 Specifications AC Measurement and Operating Characteristics AC Measurement and Operating Characteristics AC Measurement Characteristics AC Operating Characteristics True RMS AC Voltage Function Digits Readings/s AC Filter AC-coupled True RMS – measures Measurement Method: ACV, ACI: 7 sec/reading Slow (3 Hz) ⁄...

  • Page 22: Measurement Rates And System Characteristics

    Chapter 1 Specifications Measurement Rates and System Characteristics Measurement Rates and System Characteristics [1] [2] Single Channel Measurement Rates System Characteristics Function Resolution Readings/s Scan Triggering DCV, 2-Wire Ohms: (10 PLC) 6 (5) Scan Count: 1 to 50,000 or continuous ⁄...

  • Page 23: Module Specifications

    Chapter 1 Specifications Module Specifications Module Specifications 34901A, 34902A, 34908A, 34903A, 34904A Multiplexer Actuator Matrix General 34901A 34902A 34908A 34903A 34904A Number of Channels 20+2 2/4 wire 2/4 wire 1 wire SPDT 2 wire Connects to Internal DMM Scanning Speed 60 ch/s 250 ch/s 60 ch/s...
  • Page 24 Chapter 1 Specifications Module Specifications Module Specifications 34905A, 34906A The ac performance graphs are shown on the following page. RF Multiplexer General 34905A 34906A AC Characteristics 34905A 34906A Number of Channels Dual 1x4 Dual 1x4 Bandwidth 2 GHz 2 GHz Ω...
  • Page 25 Chapter 1 Specifications Typical AC Performance Graphs Typical AC Performance Graphs 34905A, 34906A Insertion Loss (50Ω) Insertion Loss (75Ω) Direct to Module Using provided adapter cables VSWR (50Ω) VSWR (75Ω) Crosstalk (50Ω) Crosstalk (75Ω)

  • Page 26: Benchlink Data Logger Software Specifications

    Agilent 82335B, 82340A/B/C, Alarming: Maskable pattern match or state change 82341A/B/C/D Speed 4 ms (max) alarm sampling National Instruments AT-GPIB/TNT, Latency 5 ms (typical) to 34970A alarm output PCI-GPIB Read/Write Speed: 95/s LAN-to-GPIB: Agilent E5810A (Windows 98/Me/ NT/2000/XP Professional) RS-232 (Serial Port):...

  • Page 27: Product And Module Dimensions

    Chapter 1 Specifications Product and Module Dimensions Product and Module Dimensions 103.6 mm 254.4 mm 374.0 mm 88.5 mm 212.6 mm 348.3 mm Module 315.6 91.9 All dimensions are shown in millimeters.

  • Page 28: To Calculate Total Measurement Error

    Chapter 1 Specifications To Calculate Total Measurement Error To Calculate Total Measurement Error Each specification includes correction factors which account for errors present due to operational limitations of the internal DMM . This section explains these errors and shows how to apply them to your measurements. Refer to “Interpreting Internal DMM Specifications,”...
  • Page 29 Chapter 1 Specifications To Calculate Total Measurement Error Understanding the “ % of range ” Error The range error compensates for inaccuracies that result from the function and range you select. The range error contributes a constant error, expressed as a percent of range, independent of the input signal level.

  • Page 30: Interpreting Internal Dmm Specifications

    Chapter 1 Specifications Interpreting Internal DMM Specifications Interpreting Internal DMM Specifications This section is provided to give you a better understanding of the terminology used and will help you interpret the internal DMM ’s specifications. Number of Digits and Overrange The “number of digits”...
  • Page 31 This means that you can achieve greater actual measurement precision for a specific accuracy specification number. The 34970A is designed and tested to meet performance better than mean 3 sigma of the published accuracy specifications.
  • Page 32 Chapter 1 Specifications Interpreting Internal DMM Specifications 24-Hour Accuracy The 24-hour accuracy specification indicates the internal DMM’s relative accuracy over its full measurement range for short time intervals and within a stable environment. Short-term accuracy is usually specified for a 24-hour period and for a 1 °C temperature ±...

  • Page 33: Configuring For Highest Accuracy Measurements

    Chapter 1 Specifications Configuring for Highest Accuracy Measurements Configuring for Highest Accuracy Measurements The measurement configurations shown below assume that the internal is in its Factory Reset state. It is also assumed that manual ranging is enabled to ensure proper full scale range selection. DC Voltage, DC Current, and Resistance Measurements: •...
  • Page 35 Quick Start...
  • Page 36 Quick Start One of the first things you will want to do with your instrument is to become acquainted with the front panel. We have written the exercises in this chapter to prepare the instrument for use and help you get familiar with some of its front-panel operations.

  • Page 37: Chapter 2 Quick Start To Prepare The Instrument For Use

    To Prepare the Instrument for Use 1 Check the list of supplied items. Verify that you have received the following items with your instrument. If anything is missing, contact your nearest Agilent Technologies Sales Office. One power cord. One User’s Guide.

  • Page 38: To Connect Wiring To A Module

    5 Install the module into mainframe. Wiring Hints... Channel Number: • For detailed information on each module, refer to the 34970A User’s Guide. • To reduce wear on the internal DMM relays, Slot Channel wire like functions on adjacent channels.
  • Page 39 Chapter 2 Quick Start To Connect Wiring to a Module Thermocouple DC Voltage / AC Voltage / Frequency Thermocouple Types: B, E, J, K, N, R, S, T Ranges: 100 mV, 1 V, 10 V, 100 V, 300 V 2-Wire Ohms / RTD / Thermistor 4-Wire Ohms / RTD Ranges: 100, 1 k, 10 k, 100 k, 1 M, 10 M, 100 MΩ...

  • Page 40: To Set The Time And Date

    Chapter 2 Quick Start To Set the Time and Date To Set the Time and Date All readings during a scan are automatically time stamped and stored in non-volatile memory. In addition, alarm data is time stamped and stored in a separate non-volatile memory queue. 1 Set the time of day.

  • Page 41: To Configure A Measurement Channel

    Chapter 2 Quick Start To Configure a Measurement Channel To Configure a Measurement Channel Use this general procedure to configure a measurement channel. 1 Select the channel. Turn the knob until the desired channel is shown on the right side of front-panel display.

  • Page 42: To Monitor A Single Channel

    Chapter 2 Quick Start To Monitor a Single Channel To Monitor a Single Channel You can use the Monitor function to continuously take readings on a single channel, even during a scan. This feature is used during front panel calibration procedures. 1 Select the channel to be monitored.

  • Page 43: To Close A Channel

    Chapter 2 Quick Start To Close a Channel To Close a Channel On the multiplexer and switch modules, you can close and open individual relays on the module. However, note that if you have already configured any multiplexer channels for scanning, you cannot independently close and open individual relays on that module.

  • Page 44: If The Instrument Does Not Turn On

    Chapter 2 Quick Start If the Instrument Does Not Turn On If the Instrument Does Not Turn On Use the following steps to help solve problems you might encounter when turning on the instrument. 1 Verify that there is ac power to the instrument. First, verify that the power cord is firmly plugged into the power receptacle on the rear panel of the instrument.
  • Page 45 Chapter 2 Quick Start If the Instrument Does Not Turn On 1 Remove the power cord. Remove the Remove the line-voltage selector from fuse-holder assembly from the rear panel. the assembly. Fuse: 500 mAT (for all line voltages) Agilent Part Number: 2110-0458 Rotate the line-voltage selector until the Replace the fuse-holder assembly in correct voltage appears in the window.

  • Page 46: To Adjust The Carrying Handle

    Chapter 2 Quick Start To Adjust the Carrying Handle To Adjust the Carrying Handle To adjust the position, grasp the handle by the sides and pull outward. Then, rotate the handle to the desired position. Benchtop Viewing Positions Carrying Position...

  • Page 47: To Rack Mount The Instrument

    Instructions and mounting hardware are included with each rack-mounting kit. Any System II instrument of the same size can be rack-mounted beside the 34970A. Remove the carrying handle, and the front and rear rubber bumpers, before rack-mounting the instrument.
  • Page 48 Chapter 2 Quick Start To Rack Mount the Instrument To rack mount a single instrument, order adapter kit 5063-9240. To rack mount two instruments side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9212. Be sure to use the support rails inside the rack cabinet. To install one or two instruments in a sliding support shelf, order shelf 5063-9255, and slide kit 1494-0015 (for a single instrument, also order filler panel 5002-3999).
  • Page 49 Front-Panel Overview...
  • Page 50 It does, however, give you a good overview of the front-panel menu and many front-panel operations. See the Agilent 34970A User’s Guide for a complete discussion of the instrument’s capabilities and operation. This chapter is divided into the following sections: •...

  • Page 51: Chapter 3 Front-Panel Overview Front-Panel Menu Reference

    Chapter 3 Front-Panel Overview Front-Panel Menu Reference Front-Panel Menu Reference This section gives an overview of the front-panel menus. The menus are designed to automatically guide you through all parameters required to configure a particular function or operation. The remainder of this chapter shows examples of using the front-panel menus.
  • Page 52 Chapter 3 Front-Panel Overview Front-Panel Menu Reference Configure the advanced measurement features on displayed channel. Set the integration time for measurements on the displayed channel. • Set the channel-to-channel delay for scanning. • Enable/disable the thermocouple check feature (T/C measurements only). •...

  • Page 53: To Unsecure For Calibration

    Chapter 3 Front-Panel Overview To Unsecure for Calibration To Unsecure for Calibration You can unsecure the instrument either from the front panel or over the remote interface. The instrument is secured when shipped from the factory and the security code is set to “ HP034970 ”. •...

  • Page 54: To Change The Security Code

    Use the arrow keys to scroll the message in the display. A list of the self-test errors messages and their meanings begin on page 168. For a complete list of error messages and descriptions, see chapter 6 in the 34970A User’s Guide.

  • Page 55: To Perform A Zero Adjustment

    Chapter 3 Front-Panel Overview To Perform a Zero Adjustment To Perform a Zero Adjustment The instrument features closed case electronic calibration. No internal mechanical adjustments are required. The instrument calculates correction factors based upon an input reference value and stores the correction factors in non-volatile memory.

  • Page 56: To Apply Mx+B Scaling To Measurements

    Chapter 3 Front-Panel Overview To Apply Mx+B Scaling to Measurements To Apply Mx+B Scaling to Measurements The scaling function allows you to apply a gain and offset to all readings on a specified multiplexer channel during a scan. In addition to setting the gain (“M”) and offset (“B”) values, you can also specify a custom measurement label for your scaled readings ( RPM , PSI , etc.).

  • Page 57: To Read The Relay Cycle Count

    01 and 21. • For more information on relay life and load considerations, refer to “Relay Life and Preventative Maintenance” in the 34970A User’s Guide. • To read the count on the active channel, choose the following item and then turn the knob.

  • Page 58: To Read A Digital Input Port

    Chapter 3 Front-Panel Overview To Read a Digital Input Port To Read a Digital Input Port The multifunction module (34907A) has two non-isolated 8-bit input/output ports which you can use for reading digital patterns. You can read the live status of the bits on the port or you can configure a scan to include a digital read.

  • Page 59: To Write To A Digital Output Port

    Chapter 3 Front-Panel Overview To Write to a Digital Output Port To Write to a Digital Output Port The multifunction module (34907A) has two non-isolated 8-bit input/output ports which you can use for outputting digital patterns. 1 Select the Digital Output port. Select the slot containing the multifunction module and continue turning the knob until DIN is displayed (channel 01 or 02).

  • Page 60: To Read The Totalizer Count

    Chapter 3 Front-Panel Overview To Read the Totalizer Count To Read the Totalizer Count The multifunction module (34907A) has a 26-bit totalizer which can count TTL pulses at a 100 kHz rate. You can manually read the totalizer count or you can configure a scan to read the count. 1 Select the totalizer channel.

  • Page 61: To Output A Dc Voltage

    Chapter 3 Front-Panel Overview To Output a DC Voltage To Output a DC Voltage The multifunction module (34907A) has two analog outputs capable of outputting calibrated voltages between 12 volts. ± 1 Select a DAC Output channel. Select the slot containing the multifunction module and continue turning the knob until DAC is displayed (channel 04 or 05).
  • Page 63 Calibration Procedures...
  • Page 64 (calibration). These procedures are required only if the internal DMM is installed. The chapter is divided into the following sections: • Agilent Technologies Calibration Services, on page 63 • Calibration Interval, on page 63 • Time Required for Calibration, on page 64 •...

  • Page 65: Chapter 4 Calibration Procedures Agilent Technologies Calibration Services

    Agilent Technologies Calibration Services Agilent Technologies Calibration Services When your instrument is due for calibration, contact your local Agilent Service Center for a low-cost recalibration. The 34970A is supported on automated calibration systems which allow Agilent to provide this service at competitive prices.

  • Page 66: Time Required For Calibration

    Chapter 4 Calibration Procedures Time Required for Calibration Time Required for Calibration The 34970A can be automatically calibrated under computer control. With computer control you can perform the complete calibration procedure and performance verification tests in less than 30 minutes once the instrument is warmed-up (see “Test Considerations”...

  • Page 67: Recommended Test Equipment

    Chapter 4 Calibration Procedures Recommended Test Equipment Recommended Test Equipment The test equipment recommended for the performance verification and adjustment procedures is listed below. If the exact instrument is not available, substitute calibration standards of equivalent accuracy. A suggested alternate method would be to use the Agilent 3458A 8 ⁄...

  • Page 68: Input Connections

    Chapter 4 Calibration Procedures Input Connections Input Connections You will need an input multiplexer module to verify or adjust the internal DMM. Input connections can be made using a 34901A 20-Channel Multiplexer. To use a 34901A to completely verify and adjust the internal DMM, make the following connections: Connections for Connections for DC V, AC V,...

  • Page 69: Calibration Security

    Chapter 4 Calibration Procedures Calibration Security Calibration Security This feature allows you to enter a security code to prevent accidental or unauthorized adjustments of the instrument. When you first receive your instrument, it is secured. Before you can adjust the instrument, you must unsecure it by entering the correct security code.

  • Page 70: To Unsecure The Instrument Without The Security Code

    Chapter 4 Calibration Procedures Calibration Security To Unsecure the Instrument Without the Security Code To unsecure the instrument without the correct security code, follow the steps below. A front panel procedure to unsecure the instrument is given on page 51. See “Electrostatic Discharge (ESD) Precautions” on page 162 before beginning this procedure.

  • Page 71: Calibration Message

    Chapter 4 Calibration Procedures Calibration Message Calibration Message The instrument allows you to store one message in calibration memory. For example, you can store such information as the date when the last calibration was performed, the date when the next calibration is due, the instrument’s serial number, or even the name and phone number of the person to contact for a new calibration.

  • Page 72: Calibration Procedure

    Chapter 4 Calibration Procedures Calibration Procedure Calibration Procedure The following procedure is the recommended method to complete an instrument calibration. Read “Test Considerations” (page 71). Unsecure the instrument for calibration (page 51). Perform the verification tests to characterize the instrument (incoming data).

  • Page 73: Test Considerations

    Chapter 4 Calibration Procedures Test Considerations Test Considerations To ensure proper instrument operation, verify that you have selected the correct power line voltage prior to attempting any procedure in this chapter. See “If the Instrument Does Not Turn On”, on page 42. Errors may be induced by ac signals present on the input leads during a self-test.

  • Page 74: Performance Verification Tests

    Chapter 4 Calibration Procedures Performance Verification Tests Performance Verification Tests Use the Performance verification Tests to verify the measurement performance of the instrument. The performance verification tests use the instrument’s specifications listed in chapter 1, “Specifications,” starting on page 15. You can perform four different levels of performance verification tests: •...

  • Page 75: Self-Test

    Chapter 4 Calibration Procedures Performance Verification Tests Self-Test A brief power-on self-test occurs automatically whenever you turn on the instrument. This limited test assures that the instrument is capable of operation and also checks the plug-in cards for basic operation. To perform a complete self-test hold down the key as you press the power switch to turn on the instrument;...

  • Page 76: Quick Performance Check

    Chapter 4 Calibration Procedures Performance Verification Tests Quick Performance Check The quick performance check is a combination of internal self-test and an abbreviated performance test (specified by the letter Q in the performance verification tests). This test provides a simple method to achieve high confidence in the instrument’s ability to functionally operate and meet specifications.

  • Page 77: Internal Dmm Verification Tests

    Chapter 4 Calibration Procedures Internal DMM Verification Tests Internal DMM Verification Tests These procedures use inputs connected to a 34901A 20-Channel Multiplexer (see page 66) installed in slot 200. Zero Offset Verification This procedure is used to check the zero offset performance of the internal DMM.
  • Page 78 Chapter 4 Calibration Procedures Internal DMM Verification Tests Continued from previous page... Select each function and range in the order shown in the table below. Before executing each test, you must press to enable reading monitoring on the selected channel (or use the ROUTe:MON command from the remote interface).

  • Page 79: Gain Verification

    (see Page 71). Add a 1-second channel delay Ω when using Fluke 5700 in 2-wire compensated mode. This avoids response time issues with 2-wire compensation when 34970A’s current source contains a pulse. [3] Verify only, no adjustment required. Q: Quick performance verification test points.
  • Page 80 Chapter 4 Calibration Procedures Internal DMM Verification Tests AC VOLTS Gain Verification Test Configuration: AC Volts LF 3 HZ:SLOW (in the Advanced menu) Make sure you have read “Test Considerations” on page 71. Select Channel 210, set the AC VOLTS function and the 3 Hz input filter.
  • Page 81 Chapter 4 Calibration Procedures Internal DMM Verification Tests AC CURRENT Gain Verification Test Configuration: AC Current LF 3 HZ:SLOW (in the Advanced menu) Make sure you have read “Test Considerations” on page 71. Select Channel 221, set the AC CURRENT function and the 3 Hz input filter.

  • Page 82: Optional Ac Performance Verification Tests

    Chapter 4 Calibration Procedures Optional AC Performance Verification Tests Optional AC Performance Verification Tests These tests are not intended to be performed with every calibration. They are provided as an aid for verifying additional instrument specifications. There are no adjustments for these tests; they are provided for performance verification only.

  • Page 83: Internal Dmm Adjustments

    Chapter 4 Calibration Procedures Internal DMM Adjustments Internal DMM Adjustments You will need a 34901A 20-Channel Multiplexer to perform the following procedures (see page 66). Install the Multiplexer in slot 200. Zero Adjustment Each time you perform a zero adjustment, the Internal DMM stores a new set of offset correction constants for every measurement function and range.

  • Page 84: Gain Adjustment

    Chapter 4 Calibration Procedures Internal DMM Adjustments Gain Adjustment The Internal DMM stores a single new gain correction constant each time this procedure is followed. The gain constant is computed from the calibration value entered for the calibration command and from measurements made automatically during the adjustment procedure.
  • Page 85 Chapter 4 Calibration Procedures Internal DMM Adjustments Valid Gain Adjustment Input Values Gain adjustment can be accomplished using the following input values. Valid Calibration Input Function Range Values DC VOLTS 100 mV to 100 V 0.9 to 1.1 x Full Scale 300 V 250 V to 303 V OHMS, OHMS 4W...
  • Page 86 Chapter 4 Calibration Procedures Internal DMM Adjustments Gain Adjustment Procedure Adjustment for each function should be performed only in the order shown in the performance verification table. The performance verification tables used for gain adjustments start on page 77. Review the “Test Considerations” (page 71) and “Gain Adjustment Considerations”...

  • Page 87: Vdc Adjustment Procedure (Optional)

    Chapter 4 Calibration Procedures –10 Vdc Adjustment Procedure (Optional) –10 Vdc Adjustment Procedure (Optional) The –10 Vdc calibration electronically enhances the Internal DMM’s a-to-d converter linearity characteristic. This adjustment should ONLY be performed after servicing the A-to-D converter or replacement of the calibration RAM. You will need a 34901A 20-Channel Multiplexer to perform the following procedures (see page 66).
  • Page 88 Chapter 4 Calibration Procedures –10 Vdc Adjustment Procedure (Optional) Continued from previous page... Reverse the cable connections to the calibrator to create a -10 Vdc voltage standard. You must physically reverse the cables. DO NOT switch the output polarity of the calibrator. Perform a –10V DC gain calibration.

  • Page 89: Plug-In Module Test Considerations

    Chapter 4 Calibration Procedures Plug-in Module Test Considerations Plug-in Module Test Considerations For optimum performance, all test procedures should comply with the following recommendations: • Assure that the calibration ambient temperature is stable and between 18 °C and 28 °C. Ideally the calibration should be performed at 23 °C ±...

  • Page 90: Relay Verification

    51 to unsecure the instrument). • For more information on relay life and load considerations, refer to “Relay Life and Preventative Maintenance” in Chapter 8 of the 34970A User’s Guide. • A procedure to read the relay cycle count is given on page 55.

  • Page 91: 34901A Relay Contact Resistance Verification (Optional)

    Tests 1 - 5: (be sure to probe the components at the indicated location). For these measurements, the 34901A is not installed in the 34970A. Record the 4-wire ohms measurements from the external DMM in the table below. Note: The connections to the external DMM are different for each of Tests 1, 2, 4, and 5.
  • Page 92 Chapter 4 Calibration Procedures Relay Verification Note: Connect bare copper wires (approximately 3 cm in length) to the I terminals of Channels 21 and 22 as shown below. These wires will be used to make shorts across the channels in Tests 6 through 39. Note: Be sure to probe the components at the indicated locations on the module.
  • Page 93 Tests 6 - 8: Be sure to route your wiring for proper strain relief and install the module cover. Install the 34901A in slot 200 of the 34970A. Open all channels on the module by performing a Factory Reset (press and select “Recall State”;...
  • Page 94 Chapter 4 Calibration Procedures Relay Verification Open all channels on the module by performing a Factory Reset. Tests 9 - 10: Configure Channel 10 (module in slot 200) as follows: 4-wire ohms, 1 kΩ range, and 5 ⁄ digits. Enable reading monitoring by pressing on the selected channel (or use the ROUTe:MON command).
  • Page 95 Chapter 4 Calibration Procedures Relay Verification ... Continued from previous page External DMM Ohmmeter Connections Test Channel Test Relay Measured Value Closed* Sense Sense Limit Measured Ch 8 __________ Ohms K408 2.00Ω Ch 9 __________ Ohms 2.00Ω K409 Ch 10 __________ Ohms K410 2.00Ω...
  • Page 96 Ch 21 I Ch 21 I Ch 22* Ch 21 L Ch 21 L __________ Ohms — — Subtract (Test 35 – Test 4) __________ Ohms K523 2.00Ω * The latching relays remain closed when the module is removed from the 34970A.
  • Page 97 Chapter 4 Calibration Procedures Relay Verification Install the 34901A in slot 200 of the 34970A. Select and configure Test 37: Channel 21 as follows: DC current, 1 amp range, and 5 ⁄ digits. Enable reading monitoring by pressing on the selected channel (or use the ROUTe:MON command).

  • Page 98: 34902A Relay Contact Resistance Verification (Optional)

    Tests 1 - 4: (be sure to probe the components at the indicated location). For these measurements, the 34902A is not installed in the 34970A. Record the 4-wire ohms measurements from the external DMM in the table below. Note: The connections to the external DMM are different for each of Tests 1, 2, and 3.
  • Page 99 Chapter 4 Calibration Procedures Relay Verification Probe here for L302 and L301 measurements. Connections for 34902A Verification Tests 1 through 4...
  • Page 100 Tests 5 - 8: Be sure to route your wiring for proper strain relief and install the module cover. Install the 34902A in slot 200 of the 34970A. Open all channels on the module by performing a Factory Reset (press and select “Recall State”;...
  • Page 101 Chapter 4 Calibration Procedures Relay Verification Open all channels on the module by performing a Factory Reset. Tests 9 - 10: Configure Channel 08 (module in slot 200) as follows: 4-wire ohms, 1 kΩ range, and 5 ⁄ digits. Enable reading monitoring by pressing on the selected channel (or use the ROUTe:MON command).
  • Page 102 Chapter 4 Calibration Procedures Relay Verification ... Continued from previous page External DMM Ohmmeter Connections Test Channels Test Relay Measured Value Closed* Sense Sense Limit Measured Ch 16 & 6 __________ Ohms K306 2.00Ω Ch 16 & 7 __________ Ohms 2.00Ω...

  • Page 103: 34903A Relay Contact Resistance Verification (Optional)

    Be sure to read “Plug-in Module Test Considerations” on page 87. Install the 34903A module in slot 100. Close Channels 01 through 20. Remove the module from the 34970A. Measure the resistance from the CM terminal to the NO terminal on each channel.

  • Page 104: 34904A Relay Contact Resistance Verification (Optional)

    (ROW1 through ROW4). Be sure to route your wiring for proper strain relief and install the module cover. Install the 34904A in slot 200 of the 34970A. Connections for 34904A Verification Tests...
  • Page 105 Chapter 4 Calibration Procedures Relay Verification Open all channels on the module by performing a Factory Reset Tests 1 - 32: (press and select “Recall State”; press again and select “Factory Reset”). For each test, close only the channels shown in the “Channels Closed”...
  • Page 106 Chapter 4 Calibration Procedures Relay Verification ... Continued from previous page External DMM Ohmmeter Connections Test Channels Test Relay Measured Value Closed* Sense Sense Limit Measured Ch 31 & 41 __________ Ohms K301 2.00Ω Ch 32 & 42 __________ Ohms 2.00Ω...

  • Page 107: 34905A/06A Relay Contact Resistance Verification (Optional)

    Chapter 4 Calibration Procedures Relay Verification (Optional) 34905A/06A Relay Contact Resistance Verification Note: Be sure to use the correct SMB connectors (50Ω or 75Ω). Be sure to read “Plug-in Module Test Considerations” on page 87. Prepare the module by connecting an SMB short to CH10, CH11, CH12, and CH13.

  • Page 108: 34908A Relay Contact Resistance Verification (Optional)

    Test 1: (be sure to probe the inductor at the indicated location). For this measurement, the 34908A is not installed in the 34970A. Record the 4-wire ohms measurements from the external DMM in the table below. External DMM Ohmmeter Connections...
  • Page 109 Chapter 4 Calibration Procedures Relay Verification Note: Be sure to probe from the right-hand side of the inductor. Connections for 34908A Verification Test 1...
  • Page 110 Tests 2 - 3: Be sure to route your wiring for proper strain relief and install the module cover. Install the 34908A in slot 200 of the 34970A. Open all channels on the module by performing a Factory Reset (press and select “Recall State”;...
  • Page 111 Connect copper shorts between all channels as shown. Be sure to route your wiring for proper strain relief and install the module cover. Install the 34908A in slot 200 of the 34970A. Connections for 34908A Verification Tests 4 through 43 For each test shown in the table starting on the next page, close only the channels shown in the “Channels Closed”...
  • Page 112 Chapter 4 Calibration Procedures Relay Verification External DMM Ohmmeter Connections Test Channels Test Relay Measured Value Closed* Sense Sense Limit Measured Ch 1 H Com L Com H Com L Com __________ Ohms K401, K422 2.00Ω Ch 2 H Com L Com H Com L Com...
  • Page 113 Chapter 4 Calibration Procedures Relay Verification ... Continued from previous page External DMM Ohmmeter Connections Test Channels Test Relay Measured Value Closed* Sense Sense Limit Measured Ch 21 H Com L Com H Com L Com __________ Ohms K401, K422 2.00Ω...

  • Page 114: Thermocouple Reference Junction (Optional)

    Chapter 4 Calibration Procedures Thermocouple Reference Junction (Optional) Thermocouple Reference Junction (Optional) Note: You should perform these verification and adjustments if you are using the modules for thermocouple measurements. To make a thermocouple measurement a known reference junction temperature measurement must be made. The reference junction temperature is measured by two solid state temperature sensors in the input connection area on the module.

  • Page 115: Thermocouple Reference Junction Adjustments

    Chapter 4 Calibration Procedures Thermocouple Reference Junction (Optional) Thermocouple Reference Junction Adjustments These adjustments are plug-in module specific and only affect thermo- couple measurements. The calibration constants created by these adjustments are stored in non-volatile memory on the plug-in module. Connect a 10 kΩ...

  • Page 116: 34907A Analog Output

    Chapter 4 Calibration Procedures 34907A Analog Output 34907A Analog Output Analog Output Verification Test This procedure is used to check the calibration of the analog outputs on the 34907A Multifunction Module. Install the module in slot 200. Verification checks are performed only for those output values with unique calibration constants.

  • Page 117: Analog Output Adjustment

    Chapter 4 Calibration Procedures 34907A Analog Output Analog Output Adjustment Note: Install the 34907A module in the mainframe and allow a 45 minute warm-up before performing these procedures. This adjustment procedure sets a zero adjustment and a gain adjustment constant for each DAC output. You must perform all the adjustments on one analog output channel before adjusting the other analog output channel.
  • Page 119 Theory of Operation...
  • Page 120 Theory of Operation This chapter is organized to provide descriptions of the circuitry contained on each schematic shown in chapter 8. A block diagram overview is provided followed by more detailed descriptions of the circuitry contained in the schematics chapter. •...

  • Page 121: System Block Diagram

    Chapter 5 Theory of Operation System Block Diagram System Block Diagram A simplified block diagram is shown below. A detailed system block diagram is shown on page 221. Not all systems have an Internal DMM. In these systems, the internal DMM connections to the analog bus and the floating logic are left open.

  • Page 122: Floating Logic

    Chapter 5 Theory of Operation Floating Logic Floating Logic Unless otherwise noted, components in this discussion are located on the A1 circuit assembly (34970-66501). The schematics are included in Chapter 8 starting on page 224. The floating common logic controls the operation of the entire instrument.
  • Page 123 Chapter 5 Theory of Operation Floating Logic The main controller, U205, is a 16-bit microcontroller incorporating many built-in features: • A 10-bit, successive approximation ADC with selectable inputs is used to convert two signals: FLASH and FRQRNG. The FLASH signal is the residual charge on the main integrating ADC output from the internal DMM assembly (A4).
  • Page 124 Chapter 5 Theory of Operation Floating Logic The custom ASIC, U209, provides: • Memory Address mapping – The main controller multiplexes address and data on the same bus. U209 latches the address and drives a separate memory address bus (MA(19:1)). U209 allows the main controller to access a much larger memory space than its 16-bit address bus would allow.

  • Page 125: Memory

    Chapter 5 Theory of Operation Memory Memory Unless otherwise noted, components in this discussion are located on the A1 circuit assembly (34970-66501). The schematics are included in Chapter 8 starting on page 224. The main controller, U205, uses 512 Kbytes of ROM and 544 Kbytes of RAM.

  • Page 126: Earth-Referenced Logic

    Chapter 5 Theory of Operation Earth-Referenced Logic Earth-Referenced Logic Unless otherwise noted, components in this discussion are located on the A1 circuit assembly (34970-66501). The schematics are included in Chapter 8 starting on page 224. The earth-referenced logic circuits provide all rear panel input/output capability.

  • Page 127: Power Supplies

    Chapter 5 Theory of Operation Power Supplies Power Supplies Unless otherwise noted, components in this discussion are located on the A1 circuit assembly (34970-66501). The schematics are included in Chapter 8 starting on page 224. The instrument uses two types of power supplies: floating supplies and earth referenced supplies.
  • Page 128 Chapter 5 Theory of Operation Power Supplies The 5 volt earth referenced supply (+5V_ER) is produced by rectifier CR101, CR102, CR103, CR104, and regulator U101. This supply is earth referenced by the screw which mounts the PC board to the instrument chassis.

  • Page 129: Front Panel

    Chapter 5 Theory of Operation Front Panel Front Panel Unless otherwise noted, components in this discussion are located on the A2 circuit assembly (34970-66502). The schematics are included in Chapter 8 starting on page 229. The front-panel circuits consist of vacuum fluorescent display control, display high voltage drivers, and keyboard scanning.

  • Page 130: Backplane

    Chapter 5 Theory of Operation Backplane Backplane Unless otherwise noted, components in this discussion are located on the A3 circuit assembly (34970-66503). The schematics are included in Chapter 8 starting on page 231. The backplane contains three connectors, P101, P102, and P103 for connection to the plug-in modules.

  • Page 131: Internal Dmm

    Chapter 5 Theory of Operation Internal DMM Internal DMM DMM Block Diagram The internal DMM block diagram is shown on the system block diagram on page 221. A portion of the block diagram is shown below. Backplane Main Controller...

  • Page 132: Input

    Chapter 5 Theory of Operation Internal DMM Input Unless otherwise noted, components in this discussion are located on the A4 circuit assembly (34970-66504). The schematics are included in Chapter 8 starting on page 234. The purpose of the Input section is to connect the Input HI terminal to the various measuring functions.

  • Page 133: Input Amplifier

    Chapter 5 Theory of Operation Internal DMM Input Amplifier Unless otherwise noted, components in this discussion are located on the A4 circuit assembly (34970-66504). The schematics are included in Chapter 8 starting on page 234. The DC Amplifier circuit is used by every measuring function except frequency and period.
  • Page 134 Chapter 5 Theory of Operation Internal DMM In the DC current function, a current is applied between the Input I and LO terminals. Ranging is accomplished by relay K102 and amplifier gain switching in U101. Since a known resistor (the shunt resister) is connected between these terminals, a voltage proportional to the unknown current is generated.

  • Page 135: Ohms Current Source

    Chapter 5 Theory of Operation Internal DMM Ohms Current Source Unless otherwise noted, components in this discussion are located on the A4 circuit assembly (34970-66504). The schematics are included in Chapter 8 starting on page 234. The ohms current source flows from the Input HI terminal to the Input terminal for both the 2-wire and 4-wire ohms functions.

  • Page 136: Ac Circuit

    Chapter 5 Theory of Operation Internal DMM AC Circuit Unless otherwise noted, components in this discussion are located on the A4 circuit assembly (34970-66504). The schematics are included in Chapter 8 starting on page 234. The multimeter uses a true RMS ac-to-dc converter to measure ac voltages and currents.
  • Page 137 Chapter 5 Theory of Operation Internal DMM The programmable capacitance is implemented by varying the signal level across a compensating capacitor. In the x0.2 configuration, low frequency gain is set by R301, R302, and R304. The variable gain element U302/U303 essentially varies the value of C306 from 0 to 1 times its value in 256 steps.

  • Page 138: A-To-D Converter

    Chapter 5 Theory of Operation Internal DMM A-to-D Converter Unless otherwise noted, components in this discussion are located on the A4 circuit assembly (34970-66504). The schematics are included in Chapter 8 starting on page 234. The analog-to-digital converter (ADC) is used to change dc voltages into digital information (schematic shown on page 9-12).
  • Page 139 Chapter 5 Theory of Operation Internal DMM Each analog-to-digital conversion begins when the multimeter is triggered. The ADC starts by clearing the integrator slope count in A1U209. At the end of the integration period, the slope count is latched. The slope count provides the most significant bits of the input voltage conversion.

  • Page 140: Switch Modules

    Chapter 5 Theory of Operation Switch Modules Switch Modules In general, all the switch modules share a common module control circuitry. This circuitry is described below. Each module is described in further detail on the following pages. Switch Module Name Page 34901A 20 Channel MUX with T/C Compensation...
  • Page 141 Chapter 5 Theory of Operation Switch Modules In addition to the +5 Volt power supply (Vcc) and ground, the module controller uses four lines for control and communication: • RESET, from the Earth Referenced Logic A1U305. RESET is common to all three slots. The module controller performs a reset when this line goes high.

  • Page 142: Relay Drivers

    Chapter 5 Theory of Operation Switch Modules U101 controls the relays on the module using an 8-bit data bus and three control lines. The data lines are latched and applied to the relay drivers. U101 enters a low-power idle mode when inactive. U101 responds when a command is received or when a scheduled reference junction temperature measurement is taken.
  • Page 143 Chapter 5 Theory of Operation Switch Modules The non-latching relay contacts are in the set position (closed) when current flows through the coil. When the current is removed, the relay resets (opens). The positive side of the relay coil is connected to +5NL.
  • Page 144 Chapter 5 Theory of Operation Switch Modules 34901A Components in this discussion are located on the A1 circuit assembly (34901-66501). The schematics are included in Chapter 8 starting on page 239. The control circuitry has four groupings of latches, relay drivers and relays.
  • Page 145 Chapter 5 Theory of Operation Switch Modules The 20 channels are divided into two banks. The banks are combined by closing K422 for voltage and 2-wire Ohms switching. When K422 is open, the banks are electrically independent of each other and this configuration is used for 4-wire Ohms multiplexing where the Ohms current sources are connected to channels 1 through 10 and the sense is obtained from channels 11 through 20.
  • Page 146 Chapter 5 Theory of Operation Switch Modules 34902A Components in this discussion are located on the A1 circuit assembly (34902-66501). The schematics are included in Chapter 8 starting on page 245. The control circuitry has of two groupings of latches, relay drivers and relays.
  • Page 147 Chapter 5 Theory of Operation Switch Modules The 16 channels are divided into two banks. The banks are combined by closing K327 for voltage and 2-wire Ohms switching. When K327 is open, the banks are electrically independent of each other and this configuration is used for 4-wire Ohms multiplexing where the Ohms current source is connected to channels 1 through 8 and the sense is obtained from channels 9 through 16.
  • Page 148 Chapter 5 Theory of Operation Switch Modules 34903A Components in this discussion are located on the A1 circuit assembly (34903-66501). The schematics are included in Chapter 8 starting on page 250. The control circuitry has two grouping of latches, relay drivers and relays.
  • Page 149 Chapter 5 Theory of Operation Switch Modules 34904A Components in this discussion are located on the A1 circuit assembly (34904-66501). The schematics are included in Chapter 8 starting on page 254. The control circuitry has four groupings of latches, relay drivers and relays divided into 4 rows by 8 columns.

  • Page 150: A/34906A

    Chapter 5 Theory of Operation Switch Modules 34905A/34906A Components in this discussion are located on the A1 circuit assembly (34905-66501 or 34906-66501). The schematics are included in Chapter 8 starting on page 258. The control circuitry has of two grouping of buffers, relay drivers and relays, one for each multiplexer bank.
  • Page 151 Chapter 5 Theory of Operation Switch Modules 34908A Components in this discussion are located on the A1 circuit assembly (34908-66501). The schematics are included in Chapter 8 starting on page 267. The control circuitry has three grouping of latches, relay drivers and relays.
  • Page 152 Chapter 5 Theory of Operation Switch Modules A single relay is used to switch two input channels. The choice of which channel is connected to the common is performed by relay K422. Channels are paired 20 channels apart (Ch 1 with Ch 21, Ch 2 with Ch 22, etc.) Relay K421 connects the common to the backplane analog bus for use with the internal DMM.

  • Page 153: Multifunction Module

    Chapter 5 Theory of Operation Multifunction Module Multifunction Module The 34907A Multifunction module contains two 8-bit digital input/ output ports, a totalizer input, and two 16-bit analog outputs. Multifunction Control Components in this discussion are located on the A1 circuit assembly (34907-66501).
  • Page 154 Chapter 5 Theory of Operation Multifunction Module In addition to the +5 Volt power supply (Vcc) and ground, the module controller uses four lines for control and communication: • RESET, from the Earth Referenced Logic A1U305. RESET is common to all three slots. The module controller performs a reset when this line goes high.

  • Page 155: Totalizer

    Chapter 5 Theory of Operation Multifunction Module Totalizer Components in this discussion are located on the A1 circuit assembly (34907-66501). The schematics are included in Chapter 8 starting on page 261. A simplified block diagram of the totalizer input is shown below. The totalizer counts signals connected to the COUNT+ and COUNT–...

  • Page 156: Analog Output

    Chapter 5 Theory of Operation Multifunction Module Analog Output Components in this discussion are located on the A1 circuit assembly (34907-66501). The schematics are included in Chapter 8 starting on page 261. A simplified block diagram of the analog output channels is shown below. Communication with each DAC (U503 and U504) is via three lines: SERSTB, DACCLK, and SERDAT.

  • Page 157: Digital I/O

    Chapter 5 Theory of Operation Multifunction Module Digital I/O Components in this discussion are located on the A1 circuit assembly (34907-66501). The schematics are included in Chapter 8 starting on page 261. A simplified diagram of a digital I/O channel is shown below. Two stages of latches on the outputs and one set of latches on the inputs provide synchronous 16 bit writes and reads of the digital ports.
  • Page 158 Chapter 5 Theory of Operation Multifunction Module The 74HC240’s, U205 and U206, provide the output high drive current necessary to maintain a TTL high output level ( 2.4 Vdc) ≥ under load. At instrument turn-on, following a reset, and whenever the data lines are being read, the MOSFETs are in the passive high state, and the high output drivers are disabled.
  • Page 159 Service...
  • Page 160 Service This chapter discusses the procedures involved for returning a failed instrument to Agilent for service or repair. Subjects covered include the following: • Operating Checklist, on page 159 • Types of Service Available, on page 160 • Repackaging for Shipment, on page 161 •...

  • Page 161: Operating Checklist

    Chapter 6 Service Operating Checklist Operating Checklist Before returning your instrument to Agilent Technologies for service or repair check the following items: Is the instrument inoperative? • Verify that the ac power cord is connected to the instrument. • Verify that the front-panel On/Standby switch has been pushed.

  • Page 162: Types Of Service Available

    Note: Agilent Unit Exchange applies to the 34970A mainframe only. Plug-in modules are not supported as exchange assemblies. When exchanging the 34970A, do not ship plug-in modules with your instrument. Remove all plug-in modules and customer wiring before shipping the unit to Agilent.

  • Page 163: Repackaging For Shipment

    Chapter 6 Service Repackaging for Shipment Repackaging for Shipment If the unit is to be shipped to Agilent for service or repair, be sure to: • Attach a tag to the unit identifying the owner and indicating the required service or repair. Include the instrument model number and your full serial number.

  • Page 164: Electrostatic Discharge (Esd) Precautions

    Chapter 6 Service Electrostatic Discharge (ESD) Precautions Electrostatic Discharge (ESD) Precautions Almost all electrical components can be damaged by electrostatic discharge ( ) during handling. Component damage can occur at electrostatic discharge voltages as low as 50 volts. The following guidelines will help prevent damage when servicing the instrument or any electronic device.

  • Page 165: To Replace The Power-Line Fuse

    Chapter 6 Service To Replace the Power-Line Fuse To Replace the Power-Line Fuse The power-line fuse is located on the rear panel of the instrument, near the power line connector. A procedure to replace the fuse is given on page 42. Use a 500 mAT, 250 V fuse for all power line settings. Troubleshooting Hints This section provides a brief check list of common failures.

  • Page 166: Unit Reports Error 705

    • To isolate the internal DMM, disassemble the instrument and remove the internal DMM. Disassembly procedures start on page 174. Run self-test again. If the self-test passes, troubleshoot or replace the Internal DMM. If the self-test fails, troubleshoot or replace the 34970A.

  • Page 167: Power Supplies

    Chapter 6 Service Troubleshooting Hints Power Supplies Verify the power supplies generated on the 34970-66501 circuit board. The front panel filament voltage, + 5 V backplane and +5 V fan are switched by the On/Standby switch. All other power supplies operate whenever the AC power cord is connected.
  • Page 168 Chapter 6 Service Troubleshooting Hints Power Supplies (continued) The A1 power supplies are tabulated below. Power Supply Minimum Maximum Switched +5 Earth Ref. 4.75 V 5.25 V +5 Backplane and Fan 4.75 V 5.25 V +5 Floating 4.75 V 5.25 V +18 Floating 17.6 V 19.9 V...

  • Page 169: Self-Test Procedures

    Note: The following pages contain a subset of the 34970A error messages. Refer to Chapter 6 in the 34970A User’s Guide (p/n 34970-90003) for the complete error message listing.

  • Page 170: Self-Tests

    Chapter 6 Service Self-Test Procedures Self-Tests A complete self-test performs the following tests. A failing test is indicated by the test number and description in the display. Front panel not responding The main CPU A1U205 attempts to establish serial communications with the front panel processor A2U1. During this test, A2U1 turns on all display segments.
  • Page 171 Chapter 6 Service Self-Test Procedures Serial configuration readback failed This test re-sends the last 9 byte serial configuration data to all the serial path. The data is then clocked back into A1U209 and compared against the original 9 bytes sent. A failure occurs if the data do not match. DC gain x1 failed This test configures for the 10 V range.
  • Page 172 Chapter 6 Service Self-Test Procedures Ohms 10 µA source failed This test configures the 10 V range with the internal internal 10 M 100:1 divider A4U102 connected across the input. The 10 µA current source is connected. A 20 ms ADC measurement is performed and the result is checked against a limit of 7.5 V ±...
  • Page 173 Chapter 6 Service Self-Test Procedures Frequency counter failed This test configures for the 100 mV ac range. This test immediately follows test 621. With A4C301 holding charge from test 621 the ac input is now switched to ground through A4K103. This produces a positive pulse on the input to the frequency comparator A4U310.

  • Page 174: Battery Check And Replacement

    Chapter 6 Service Battery Check and Replacement Battery Check and Replacement The internal battery, A1BT101, provides power to the internal real-time clock, stored states, and reading storage memory whenever ac line power is removed. Note: The internal battery state does not affect the calibration memory. The battery has an expected life of approximately 4 years.

  • Page 175: To Verify The Battery

    Chapter 6 Service Battery Check and Replacement To Verify the Battery Remove AC line power (this also provides a load on A1BT101). Remove the cover (see page 174). Measure the battery voltage as shown. Replace the battery if the voltage is below 2.7 V. Battery –...

  • Page 176: Disassembly

    Chapter 6 Service Disassembly Disassembly The following tools are recommended for disassembly. • T15 Torx ® driver (all screws) • 11 mm nut driver (front-panel disassembly) • 5 mm nut driver (rear-panel connectors) Tighten the fan screws to a maximum of 6 in/lbs (0.68 newton/meter). SHOCK HAZARD.

  • Page 177: General Disassembly

    Chapter 6 Service Disassembly General Disassembly...

  • Page 178: Internal Dmm Disassembly

    Chapter 6 Service Disassembly Internal DMM Disassembly...
  • Page 179 Chapter 6 Service Disassembly Front-Panel Disassembly Maximum Torque: 6 in/lbs (0.68 n/m) Note: When reassembling the front panel, be sure to route the front-panel cable as shown above. Do not allow the front-panel cable to touch the digital ribbon cable.
  • Page 180 Chapter 6 Service Disassembly Additional Chassis Disassembly...

  • Page 181: Plug-In Module Disassembly

    Chapter 6 Service Disassembly Plug-In Module Disassembly Needle-nose Pliers...
  • Page 183 Replaceable Parts...

  • Page 184: Replaceable Parts

    This chapter contains information ordering replacement parts for your instrument. The parts lists are divided into the following groups. • 34970A Mainframe, on page 183 • 34970-66501 Main PC Assembly (A1), on page 184 • 34970-66502 Front-Panel and Keyboard PC Assembly (A2), on page 189 •...

  • Page 185: A Mainframe

    Chapter 7 Replaceable Parts 34970A Mainframe 34970A Mainframe Reference Part Part Description Mfr Part Number Designator Number Code 34970-66501 PCA-DIGITAL BD 02362 34970-66501 34970-66502 PCA-DISPLAY BD 02362 34970-66502 34970-66503 PCA-BACKPLANE BD 02362 34970-66503 34970-66504 PCA-DMM BD 02362 34970-66504 34970-80010 Internal DMM Field Kit...

  • Page 186: Main Pc Assembly (A1)

    Chapter 7 Replaceable Parts 34970-66501 Main PC Assembly (A1) 34970-66501 Main PC Assembly (A1) Reference Part Part Description Mfr Part Number Designator Number Code BT101 1420-0860 BATTERY 3V 850A-HR LI MANGANESE DIOXIDE 07371 CR14250SE-FT1 C101 0180-4435 CAP-FXD 2200uF +-20% 25 V AL-ELCTLT 06360 KME25VB222M16X25MCV C102...
  • Page 187 Chapter 7 Replaceable Parts 34970-66501 Main PC Assembly (A1) Reference Part Part Description Mfr Part Number Designator Number Code C350-C351 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A C370 0160-5947 CAP-FXD 1000pF 50 V 02010 08055C102KATA C373 0160-5945 CAP-FXD 0.01uF +-10% 50 V CER X7R 02010 08055C103KATA C401-C409...
  • Page 188 Chapter 7 Replaceable Parts 34970-66501 Main PC Assembly (A1) Reference Part Part Description Mfr Part Number Designator Number Code P201 1251-0600 CONNECTOR-SGL CONT PIN 1.14-MM-BSC-SZ SQ 01136 928-196-004140 P302 34970-61601 1 CABLE, DGTL-BKPLN 03418 22-43-2060 P303 34970-61602 1 CABLE, RS232-DGTL 04726 87920-1000T Q101...
  • Page 189 Chapter 7 Replaceable Parts 34970-66501 Main PC Assembly (A1) Reference Part Part Description Mfr Part Number Designator Number Code R222 0699-3034 RESISTOR 1K +-1% .1W TKF TC=0+-100 06337 9C08052A1001FKR R251 0699-3058 RESISTOR 100 +-1% .1W TKF TC=0+-100 06337 9C08052A1000FKR R252-R254 0699-3034 RESISTOR 1K +-1% .1W TKF TC=0+-100 06337...
  • Page 190 Chapter 7 Replaceable Parts 34970-66501 Main PC Assembly (A1) Reference Part Part Description Mfr Part Number Designator Number Code U107 1826-1572 IC COMPARATOR PRCN DUAL 8 PIN PLSTC-SOIC 02910 LM393D U150 1826-2817 IC PWR MGT-V-REF-FXD 4.975/5.025V 3 PINS 03406 LM4040CIM3-5.0 U201 1818-6821 FRAM SERIAL 4K FMZ4C04-S...

  • Page 191: Front-Panel And Keyboard Pc Assembly (A2)

    Chapter 7 Replaceable Parts 34970-66502 Front-Panel and Keyboard PC Assembly (A2) 34970-66502 Front-Panel and Keyboard PC Assembly (A2) Reference Part Part Description Mfr Part Number Designator Number Code 0180-3751 CAP-FXD 1uF +-20% 35 V TA 00039 NRS105M35R8 0180-4287 CAP-FXD 10uF +-20% 35 V TA 05524 293D106X0035D2W C3-C13...

  • Page 192: Backplane Pc Assembly (A3)

    Chapter 7 Replaceable Parts 34970-66503 Backplane PC Assembly (A3) 34970-66503 Backplane PC Assembly (A3) Reference Part Part Description Mfr Part Number Designator Number Code C109 0160-7438 CAP-FXD 0.01uF +-10% 500 V CER X7R 02010 12107C103KATA E101-E102 1970-0100 TUBE-ELECTRON SURGE V PTCTR 11484 1970-0100 1400-0977...

  • Page 193: Internal Dmm Pc Assembly (A4)

    Chapter 7 Replaceable Parts 34970-66504 Internal DMM PC Assembly (A4) 34970-66504 Internal DMM PC Assembly (A4) Reference Part Part Description Mfr Part Number Designator Number Code C100 0160-6839 CAP-FXD 470pF 630 V POLYP-FL 02995 703E1AD471PG631TX C101-C103 0160-6842 CAP-FXD 220pF 630 V POLYP-FL 02995 703E1AD221PG631TX C104...
  • Page 194 Chapter 7 Replaceable Parts 34970-66504 Internal DMM PC Assembly (A4) Reference Part Part Description Mfr Part Number Designator Number Code C403-C404 0160-6497 CAP-FXD 0.1uF 25 V 02010 12065C104KATA C407-C408 0160-6497 CAP-FXD 0.1uF 25 V 02010 12065C104KATA C410 0160-6497 CAP-FXD 0.1uF 25 V 02010 12065C104KATA C441-C442...
  • Page 195 Chapter 7 Replaceable Parts 34970-66504 Internal DMM PC Assembly (A4) Reference Part Part Description Mfr Part Number Designator Number Code R103 0699-1380 RESISTOR 3.16K +-1% .125W TKF TC=0+-100 04935 9C12063AFKR R104 0699-4821 RESISTOR 75K 5% 2512 200V 1W TC=200 05524 CRCW2512753J R105 0699-3406...
  • Page 196 Chapter 7 Replaceable Parts 34970-66504 Internal DMM PC Assembly (A4) Reference Part Part Description Mfr Part Number Designator Number Code R315 0699-1327 RESISTOR 1M +-1% .125W TKF TC=0+-100 04935 9C12063AFKR R316 0699-1423 RESISTOR 215 +-1% .125W TKF TC=0+-100 04935 9C12063AFKR R317 0699-1406 RESISTOR 42.2K +-1% .125W TKF TC=0+-100...
  • Page 197 Chapter 7 Replaceable Parts 34970-66504 Internal DMM PC Assembly (A4) Reference Part Part Description Mfr Part Number Designator Number Code U201 1826-2420 IC OP AMP LP DUAL 8 PIN PLSTC-SOIC 03285 AD706JR U301 1826-2436 IC OP AMP WB 8 PIN PLSTC-SOIC 03406 LF356M U302...

  • Page 198: A 20-Channel Multiplexer

    Chapter 7 Replaceable Parts 34901A 20-Channel Multiplexer 34901A 20-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code C101-C106 0160-7798 CAP 0.1 uF 50V 10% X7R 0805 02010 08055C104KAT_A C107 0160-7708 CAP-FXD 1000pF +-5% 50 V CER C0G 12340 C0805C102J5GAC C109...
  • Page 199 Chapter 7 Replaceable Parts 34901A 20-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code K423 0490-1895 RLY-2C 2A 220V 60WATT 4.5V COIL 12921 G6S-2-DC4.5 K521 0490-1895 RLY-2C 2A 220V 60WATT 4.5V COIL 12921 G6S-2-DC4.5 K522-K524 0490-1896 RLY-2C 2A 220V 60WATT 3V-COIL LATCHING 12921 G6SU-2-DC3 L101-L103...
  • Page 200 Chapter 7 Replaceable Parts 34901A 20-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code Q309 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q310 1853-0525 TRANSISTOR PNP SI TO-236AA PD=200MW 02237 MMBT2907 Q311 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q312...
  • Page 201 Chapter 7 Replaceable Parts 34901A 20-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code U141 1821-0055 IC SCHMITT-TRIG CMOS/ACT NAND QUAD 2-INP 02037 MC74ACT132D U150 1818-6821 FRAM SERIAL 4K FMZ4C04-S 14543 FM24C04-S U151-U152 1821-4861 IC INTERFACE MISC 12186 DS75S XU101...

  • Page 202: A 16-Channel Multiplexer

    Chapter 7 Replaceable Parts 34902A 16-Channel Multiplexer 34902A 16-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code C101-C104 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A C105-C112 0160-5967 CAP-FXD 100PF 5% 0805 03292 0160-5967 C113 0160-7828 CAP .1UF 16V 10% X7R 02010 0603C104KAT...
  • Page 203 Chapter 7 Replaceable Parts 34902A 16-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code Q101 1855-1101 TRANSISTOR 02037 MMDF2P02E Q201-Q218 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q220 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A R102-R103 0699-3034 RESISTOR 1K +-1% .1W TKF TC=0+-100...

  • Page 204: A 20-Channel Actuator

    Chapter 7 Replaceable Parts 34903A 20-Channel Actuator 34903A 20-Channel Actuator Reference Part Part Description Mfr Part Number Designator Number Code C101-C104 0160-7798 CAP 0.1UF +-10% 50V CER X7R 06352 C2012X7R1H104K C107 0160-5947 CAP-FXD 1000pF 50 V 02010 08055C102KATA C110 0160-7798 CAP 0.1UF +-10% 50V CER X7R 06352 C2012X7R1H104K...
  • Page 205 Chapter 7 Replaceable Parts 34903A 20-Channel Actuator Reference Part Part Description Mfr Part Number Designator Number Code Q215 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q216-Q217 1853-0525 TRANSISTOR PNP SI TO-236AA PD=200MW 02237 MMBT2907 Q218 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q219...

  • Page 206: A 4X8 Matrix

    Chapter 7 Replaceable Parts 34904A 4x8 Matrix 34904A 4x8 Matrix Reference Part Part Description Mfr Part Number Designator Number Code C140 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A C151 0160-5947 CAP-FXD 1000pF 50 V 02010 08055C102KATA C154-C157 0160-5945 CAP-FXD 0.01uF 50 V 02010 08055C103KATA...
  • Page 207 Chapter 7 Replaceable Parts 34904A 4x8 Matrix Reference Part Part Description Mfr Part Number Designator Number Code Q213 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q221 1853-0525 TRANSISTOR PNP SI TO-236AA PD=200MW 02237 MMBT2907 Q223 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q231...
  • Page 208 Chapter 7 Replaceable Parts 34904A 4x8 Matrix Reference Part Part Description Mfr Part Number Designator Number Code R241 0699-3051 RESISTOR 10K +-1% .1W TKF TC=0+-100 06337 9C08052A1002FKR R243 0699-3051 RESISTOR 10K +-1% .1W TKF TC=0+-100 06337 9C08052A1002FKR R251 0699-3051 RESISTOR 10K +-1% .1W TKF TC=0+-100 06337 9C08052A1002FKR R253...

  • Page 209: A/34906A Rf Multiplexer

    Chapter 7 Replaceable Parts 34905A/34906A RF Multiplexer 34905A/34906A RF Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code C101-C103 0160-5945 CAP-FXD 0.01uF 50 V 02010 08055C103KATA C111 0160-5945 CAP-FXD 0.01uF 50 V 02010 08055C103KATA C140 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A C151...
  • Page 210 Chapter 7 Replaceable Parts 34905A/34906A RF Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code Q201 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q202 1853-0525 TRANSISTOR PNP SI TO-236AA PD=200MW 02237 MMBT2907 Q203 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q204...

  • Page 211: A Multifunction Module

    Chapter 7 Replaceable Parts 34907A Multifunction Module 34907A Multifunction Module Reference Part Part Description Mfr Part Number Designator Number Code C101-C102 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A C103 0160-5945 CAP-FXD 0.01uF 50 V 02010 08055C103KATA C104-C105 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A...
  • Page 212 Chapter 7 Replaceable Parts 34907A Multifunction Module Reference Part Part Description Mfr Part Number Designator Number Code CR101-CR106 1906-0358 DIODE-DUAL 100V 100MA TO-236AB (SOT-23) 03406 MMBD1203-HIGH CR110 1906-0291 DIODE-DUAL 70V 100MA T0-236AA 02910 BAV99 CR301-CR308 1906-0358 DIODE-DUAL 100V 100MA TO-236AB (SOT-23) 03406 MMBD1203-HIGH CR401-CR408 1906-0358...
  • Page 213 Chapter 7 Replaceable Parts 34907A Multifunction Module Reference Part Part Description Mfr Part Number Designator Number Code R108 0699-3053 RESISTOR 100K +-1% .1W TKF TC=0+-100 02995 9C08052A1003FKR R109 0699-3051 RESISTOR 10K +-1% .1W TKF TC=0+-100 06337 9C08052A1002FKR R110-R111 0699-2973 RESISTOR 215 +-1% .1W TKF TC=0+-100 06337 9C08052A2150FKR R112...
  • Page 214 Chapter 7 Replaceable Parts 34907A Multifunction Module Reference Part Part Description Mfr Part Number Designator Number Code R552 0699-3061 RESISTOR 261 +-1% .1W TKF TC=0+-100 06337 9C08052A2610FKR R553-R556 0699-1319 RESISTOR 12.1K +-1% .125W TKF TC=0+-100 04935 9C12063AFKR RP101-RP102 1810-1580 RESISTOR; CARBON FILM;NTWRK 00746 MNR34K5AWJ103 RP104-RP105...

  • Page 215: A 40-Channel Multiplexer

    Chapter 7 Replaceable Parts 34908A 40-Channel Multiplexer 34908A 40-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code C101-C106 0160-7798 CAP 0.1UF 50V 10% X7R 0805 02010 08055C104KAT_A C107 0160-7708 CAP-FXD 1000pF +-5% 50 V CER C0G 12340 C0805C102J5GAC C109 0160-7798...
  • Page 216 Chapter 7 Replaceable Parts 34908A 40-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code 34901-60001 KIT, MODULE COVER, CASE 02362 34901-60001 Q101 1855-1101 TRANSISTOR-MOSFET DUAL P-CHAN E-MODE SI 02037 MMDF2P02E Q201 1854-1053 TRANSISTOR NPN SI SOT-23 (TO-236AB) 12125 KST2222A Q202-Q203...
  • Page 217 Chapter 7 Replaceable Parts 34908A 40-Channel Multiplexer Reference Part Part Description Mfr Part Number Designator Number Code R154 0699-3947 RESISTOR 1K +-1% .063W TKF TC=0+-200 06337 9C0603A1001FL R156 0699-3947 RESISTOR 1K +-1% .063W TKF TC=0+-200 06337 9C0603A1001FL R166-R168 0699-3034 RESISTOR 1K +-1% .1W TKF TC=0+-100 06337 9C08052A1001FKR R170-R180...

  • Page 218: Manufacturer's List

    AVX CORP GREAT NECK 02037 MOTOROLA INC ROSELLE 02194 ROBINSON NUGENT INC NEW ALBANY 02237 FAIRCHILD SEMICONDUCTOR SOUTH PORTLAND 02361/2 AGILENT TECHNOLOGIES LOVELAND 02499 INTERNATIONAL RESISTIVE CO. BOONE 02883 TEMIC/SILICONIX INC SANTA CLARA 02910 PHILIPS SEMICONDUCTORS EINDHOVEN 03038 INTL RECTIFIER CORP...
  • Page 219 Chapter 7 Replaceable Parts Manufacturer’s List Mfr Code Mfr Name City State Country 04733 BELL INDUSTRIES INC MILLER JW DIV GARDENA 05176 AMERICAN SHIZUKI CORP CANOGA PARK 05524 VISHAY INTERTECHNOLOGY INC MALVERN 05525 ELCO CORP NEWPORT BEACH 05535 KEYSTONE ELECTRONICS CORP NEW YORK 05951 WICKMANN-WERKE A G...
  • Page 220 Chapter 7 Replaceable Parts Manufacturer’s List...
  • Page 221 Schematics...
  • Page 222 The block diagram and schematics support the Theory of Operation in chapter 5. • Agilent 34970A System Block Diagram, o n page 221 • A1 Component Locators, starting on page 222 •...
  • Page 223 Agilent 34970A System Block Diagram...
  • Page 224 34970-66501 (sheet 1 of 2) A1 Component Locator (top)
  • Page 225 34970-66501 (sheet 2 of 2) A1 Component Locator (bottom)
  • Page 226 34970-66501 (sheet 1 of 4) A1 Power Supply Schematic...
  • Page 227 34970-66501 (sheet 2 of 4) A1 Floating Logic Schematic...
  • Page 228 34970-66501 (sheet 3 of 4) A1 Earth Referenced Logic Schematic...
  • Page 229 34970-66501 (sheet 4 of 4) A1 Memory Schematic...

  • Page 230: A2 Display And Keyboard Component Locator

    34970-66502 (sheet 1 of 1) A2 Display and Keyboard Component Locator (top)

  • Page 231: A2 Display And Keyboard Schematic

    34970-66502 (sheet 1 of 1) A2 Display and Keyboard Schematic...
  • Page 232 34970-66503 (sheet 1 of 1) A3 Backplane Component Locator...
  • Page 233 34970-66503 (sheet 1 of 1) A3 Backplane Schematic...
  • Page 234 34970-66504 (sheet 1 of 2) A4 Internal DMM Component Locator (top)
  • Page 235 34970-66504 (sheet 2 of 2) A4 Internal DMM Component Locator (bottom)
  • Page 236 Note: The DIAG:DMM:CYCLes? command returns three numbers indicating the cycle count on backplane relays “1”, “2”, and “3” (which correspond to relays K102, K103, and K104 respectively). See chapter 5 in the User’s Guide for more information. 34970-66504 (sheet 1 of 4) A4 Input and Protection Schematic...
  • Page 237 34970-66504 (sheet 2 of 4) A4 Input Amplifier and Ohms Current Schematic...
  • Page 238 34970-66504 (sheet 3 of 4) A4 AC Schematic...
  • Page 239 34970-66504 (sheet 4 of 4) A4 A/D Converter Schematic...

  • Page 240: 34901A 20-Channel Multiplexer Component Locator

    34901-66501 (sheet 1 of 1) 34901A 20-Channel Multiplexer Component Locator...
  • Page 241 34901-66501 (sheet 1 of 5) 34901A 20-Channel Multiplexer Schematic...
  • Page 242 34901-66501 (sheet 2 of 5) 34901A 20-Channel Multiplexer Schematic...
  • Page 243 34901-66501 (sheet 3 of 5) 34901A 20-Channel Multiplexer Schematic...
  • Page 244 34901-66501 (sheet 4 of 5) 34901A 20-Channel Multiplexer Schematic...
  • Page 245 34901-66501 (sheet 5 of 5) 34901A 20-Channel Multiplexer Schematic...

  • Page 246: 34902A 16-Channel Multiplexer Component Locator

    34902-66501 (sheet 1 of 1) 34902A 16-Channel Multiplexer Component Locator...
  • Page 247 34902-66501 (sheet 1 of 4) 34902A 16-Channel Multiplexer Schematic...
  • Page 248 34902-66501 (sheet 2 of 4) 34902A 16-Channel Multiplexer Schematic...
  • Page 249 34902-66501 (sheet 3 of 4) 34902A 16-Channel Multiplexer Schematic...
  • Page 250 34902-66501 (sheet 4 of 4) 34902A 16-Channel Multiplexer Schematic...
  • Page 251 34903-66501 (sheet 1 of 1) 34903A 20-Channel Actuator Component Locator...
  • Page 252 34903-66501 (sheet 1 of 3) 34903A 20-Channel Actuator Schematic...
  • Page 253 34903-66501 (sheet 2 of 3) 34903A 20-Channel Actuator Schematic...
  • Page 254 34903-66501 (sheet 3 of 3) 34903A 20-Channel Actuator Schematic...
  • Page 255 34904-66501 (sheet 1 of 1) 34904A 4x8 Matrix Component Locator...
  • Page 256 34904-66501 (sheet 1 of 3) 34904A 4x8 Matrix Schematic...
  • Page 257 34904-66501 (sheet 2 of 3) 34904A 4x8 Matrix Schematic...
  • Page 258 34904-66501 (sheet 3 of 3) 34904A 4x8 Matrix Schematic...
  • Page 259 34905-66501/34906-66501 (sheet 1 of 1) 34905A/34906A RF Multiplexer Component Locator...
  • Page 260 34905-66501/34906-66501 (sheet 1 of 2) 34905A/34906A RF Multiplexer Schematic...
  • Page 261 34905-66501/34906-66501 (sheet 2 of 2) 34905A/34906A RF Multiplexer Schematic...

  • Page 262: 34907A Multifunction Module Component Locator

    34907-66501 (sheet 1 of 1) 34907A Multifunction Module Component Locator...
  • Page 263 34907-66501 (sheet 1 of 5) 34907A Multifunction Module Schematic...
  • Page 264 34907-66501 (sheet 2 of 5) 34907A Multifunction Module Schematic...
  • Page 265 34907-66501 (sheet 3 of 5) 34907A Multifunction Module Schematic...
  • Page 266 34907-66501 (sheet 4 of 5) 34907A Multifunction Module Schematic...
  • Page 267 34907-66501 (sheet 5 of 5) 34907A Multifunction Module Schematic...

  • Page 268: 34908A 40-Channel Multiplexer Component Locator

    34908-66501 (sheet 1 of 1) 34908A 40-Channel Multiplexer Component Locator...
  • Page 269 34908-66501 (sheet 1 of 3) 34908A 40-Channel Multiplexer Schematic...
  • Page 270 34908-66501 (sheet 2 of 3) 34908A 40-Channel Multiplexer Schematic...
  • Page 271 34908-66501 (sheet 3 of 3) 34908A 40-Channel Multiplexer Schematic...
  • Page 273 Factory Reset State Specifications The table below shows the state of the instrument after a FACTORY RESET from the Sto/Rcl menu or *RST command from the remote interface. Quick Start Measurement Configuration Factory Reset State Function DC Volts Range Autorange Resolution digits ⁄...

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