Keithley 1801 Instruction Manual
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Keithley 1801 Instruction Manual

Keithley 1801 Instruction Manual

Keithley 1801 nanovolt preamp
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Model 1801
Nanovolt Preamp
Instruction Manual
A G R E A T E R M E A S U R E O F C O N F I D E N C E

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Summary of Contents for Keithley 1801

  • Page 1 Model 1801 Nanovolt Preamp Instruction Manual A G R E A T E R M E A S U R E O F C O N F I D E N C E...
  • Page 2 WARRANTY Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes, and documentation.
  • Page 3 Model 1801 Nanovolt Preamp Instruction Manual ©1993, Keithley Instruments, Inc. All rights reserved. Third Printing April 1999 Cleveland, Ohio, U.S.A. Document Number: 1801-901-01 Rev. C...
  • Page 4 Addendum B (Document Number 1801-901-02)................ October 1995 Revision C (Document Number 1801-901-01) ................. April 1999 All Keithley product names are trademarks or registered trademarks of Keithley Instruments, Inc. Other brand and product names are trademarks or registered trademarks of their respective holders.
  • Page 5 Keithley products are designed for use with electrical signals that The instrument and accessories must be used in accordance with its are rated Installation Category I and Installation Category II, as de- specifications and operating instructions or the safety of the equip-...
  • Page 6 Keithley Instru- symbol on an instrument indicates that the user should re- ments. Standard fuses, with applicable national safety approvals, fer to the operating instructions located in the manual.

  • Page 7: Table Of Contents

    Table of Contents General Information Introduction ..............................1-1 Features ................................1-1 Warranty information ............................1-1 Manual addenda .............................. 1-2 Safety symbols and terms ..........................1-2 Specifications ..............................1-2 Unpacking and inspection ..........................1-2 1.7.1 Inspection for damage ........................... 1-2 1.7.2 Shipment contents ..........................
  • Page 8 Introduction ..............................3-1 Preamplifier operation ............................ 3-1 3.2.1 Power-up detection ..........................3-1 3.2.2 Preamplifier configuration menu ......................3-2 3.2.3 Enabling Model 1801 operation ......................3-2 3.2.4 Preamp ON/OFF states .......................... 3-2 3.2.5 Preamplifier filtering ..........................3-4 3.2.6 Operational differences ......................... 3-5 3.2.7...
  • Page 9 Principles of operation ..........................5-10 5.3.1 Block diagram ............................5-10 5.3.2 Preamplifier module ..........................5-10 5.3.3 Power supply cable ..........................5-10 5.3.4 Power supply card ..........................5-10 Special handling of static-sensitive devices ....................5-12 Troubleshooting ............................5-12 5.5.1 Troubleshooting equipment ......................... 5-12 5.5.2 Troubleshooting access ........................
  • Page 10 List of Illustrations Installation Figure 2-1 Preamplifier module configuration ..................... 2-2 Figure 2-2 Power supply card configuration ......................2-3 Figure 2-3 Power and output connections ......................2-4 Figure 2-4 Typical analog output connections ..................... 2-5 Figure 2-5 Power supply card installation ......................2-6 Figure 2-6 Power supply connections ........................
  • Page 11 Table 3-6 Factory default conditions ........................3-6 Table 3-7 Preamplifier configuration commands ....................3-7 Table 3-8 CONFIG TEMPERATURE menu with Model 1801 enabled ............3-14 Table 3-9 Differential temperature bus commands ................... 3-18 Table 3-10 Thermoelectric coefficients ......................3-18 Performance Verification Table 4-1 Recommended test equipment for performance verification ..............

  • Page 12: General Information

    When returning the preamplifier for repair, be sure to fill out and include the service form at the back The Model 1801 is designed to be used with the Model of this manual in order to provide the repair facility with 2001 Multimeter.

  • Page 13: Manual Addenda

    Model 2001 is properly calibrated. Repacking for shipment Should it become necessary to return the Model 1801 for repair, carefully pack the preamplifier, power supply card, Unpacking and inspection and power cable in the original packing carton or the equivalent, and include the following information: 1.7.1 Inspection for damage...

  • Page 14: Model 2001 Compatibility

    General Information Model 2001 compatibility 1.10 Optional accessories The Model 1801 can be used only with Model 2001 Mul- Model 1483 Low-Thermal Connection Kit timeters with main microcontroller revision B01 or later firmware. The firmware revision level is displayed during The Model 1483 contains a crimp tool, pure copper lugs, the power-up cycle (the main microcontroller firmware...

  • Page 15: Installation

    This section includes information on installing the Model the Model 2001 Multimeter and describes how to 1801 in the Model 2001 Multimeter and making power remove the card. supply and output connections.

  • Page 16: Card Configuration

    These controls need not be adjusted during and nuts intended for connecting input signals to the normal operation. Model 1801. To minimize thermal EMFs, use only pure copper lugs or wires for connections, and be sure that both NOTE...

  • Page 17: Power Supply Card

    Installation 2.2.2 Power supply card Cable Clamp The cable clamp provides a strain relief for the output Figure 2-2 shows the configuration of the power supply leads and power cable. card. Components include: Cover Output Leads The plastic cover shields circuit board parts from damage The two output leads are terminated with banana plugs and contamination.

  • Page 18: Power Supply Card Preparation

    Model 1801/2001. Typ- ical common-mode current levels for a DMM or chart •...

  • Page 19: Power Supply Card Installation And Removal

    2. Slide the power supply card edges into the guide rails This paragraph explains how to install and remove the inside the multimeter. Model 1801 power supply card assembly in the Model 3. With the ejector arms in the unlocked position, care- 2001 Multimeter.

  • Page 20: Connections

    Installation Unlock card Ejector Arms (2) Lock card Figure 2-5 Power supply card installation Connections 2.5.1 Power supply connections After installing the power supply in the multimeter, con- This paragraph provides the information necessary to nect the preamplifier to the power supply card using the connect the preamplifier module to the power supply card supplied connecting cable, as shown in Figure 2-6.

  • Page 21: Output Connections To Multimeter

    Power supply connections • Use only shielded low-thermal cables such as the CAUTION input cable supplied with the Model 1801. Turn off the Model 2001 Multimeter • Use only crimped-on copper lugs and copper wires power before connecting or discon- for all input connections.

  • Page 22: Figure 2-7 Connections To Multimeter Input

    4-wire resistance output connections. 2. Select rear inputs using front panel switch. LO (Black) Figure 2-7 Connections to multimeter input KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: Low-Thermal Black NO INTERNAL OPERATOR SERVICEABLE PARTS, Input Cable SERVICE BY QUALIFIED PERSONNEL ONLY.

  • Page 23: Operating Considerations

    Installation Operating considerations 2.6.2 Minimum operating distance The Model 1801 preamplifier module should be kept a 2.6.1 Using the thermal isolation container minimum of two feet away from the Model 2001 Multi- After making all connections, place the preamplifier mod-...

  • Page 24: Operation

    Note that you can query the instrument over the IEEE-488 bus to determine if the Model 1801 is present by using the Preamplifier operation *OPT? query. If the preamplifier is present, the instru- ment will return the following response: 3.2.1 Power-up detection...

  • Page 25: Preamplifier Configuration Menu

    4. Press EXIT to return to normal display. The unit will Table 3-1 summarizes error messages that may occur dur- display the following message to indicate that the ing power-up when the Model 1801 is installed. preamplifier is enabled: Preamp ON 3.2.2 Preamplifier configuration menu...

  • Page 26: Table 3-2 Configure Preamp Menu Structure

    Operation Table 3-2 CONFIGURE PREAMP menu structure Menu item Description CONTROL Enable/disable preamplifier. ENABLE Enable preamplifier. DISABLE Disable preamplifier. FILTER Select preamplifier filter. FAST Select fast response filter. MEDIUM Select medium response filter. SLOW Select slow response filter. CALIBRATION Calibrate preamplifier. CALIBRATION-DATES Set calibration dates.

  • Page 27: Preamplifier Filtering

    3.2.5 Preamplifier filtering 2. Select FILTER, then press ENTER. The unit will dis- play filter response selections: The Model 1801 has three analog filters with FAST, MEDIUM, and SLOW responses respectively. These fil- SELECT PREAMP FILTER ters are in addition to the Model 2001 filter, which can FAST MEDIUM SLOW also be used with the preamplifier.

  • Page 28: Operational Differences

    Number corresponds to conditions listed in Table 3-4. Figure 3-1 Filter frequency response curves 3.2.6 Operational differences select one of these functions when the Model 1801 is enabled: Functions Function is not available with Preamp enabled The following functions are available when using the...

  • Page 29: Table 3-6 Factory Default Conditions

    Recalling setups Notes: The state of the Model 1801 depends on the type of setup 1. If a recalled setup requires that the Model 1801 be being recalled: GPIB defaults, bench defaults, or user enabled, and the preamplifier is not installed in the setup.

  • Page 30: Ieee-488 Bus Operation

    If you send an invalid program message, an Measurements error will result. 3.3.1 DC voltage measurements NOTE The Model 1801 can detect DC voltages as low as 1pV Additional commands that control dif- and measure up to 2mV. Assuming “bench reset” condi- ferential thermocouple temperature tions (see paragraph 3.12.1 of the Model 2001 Operator’s...

  • Page 31: Figure 3-2 Connections For Dc Voltage Measurements

    Operation DC Voltage Source KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: Low-Thermal NO INTERNAL OPERATOR SERVICEABLE PARTS, Black Input Cable SERVICE BY QUALIFIED PERSONNEL ONLY. Black PEAK Noise Shield NOTE : Use only clean copper-to-copper connections.

  • Page 32: Ac Voltage Measurements

    Appendix A. 5. Connect the input leads to the voltage source, as shown in Figure 3-3. To zero (rel) the Model 1801, follow the steps below: CAUTION 1. Disable rel if presently enabled by pressing the REL Do not exceed 1V peak at 100mA key.

  • Page 33: Figure 3-3 Connections For Ac Voltage Measurements

    Operation AC Voltage Source KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: Low-Thermal NO INTERNAL OPERATOR SERVICEABLE PARTS, Black Input Cable SERVICE BY QUALIFIED PERSONNEL ONLY. Black PEAK Noise Shield NOTE : Use only clean copper-to-copper connections.

  • Page 34: Four-Wire Resistance Measurements

    Do not exceed 1V peak at 100mA between the INPUTS HI and LO ter- minals, or the preamplifier may be To zero (rel) the Model 1801, follow the steps below: damaged. (Inputs over 2mV will 1. Disable rel if presently enabled by pressing the REL require a one-minute recovery period.)

  • Page 35: Figure 3-4 Connections For 4-Wire Resistance Measurements

    Operation Resistor Under Test 1801 NANOVOLT PREAMP KEITHLEY INPUTS V ZERO I ZERO PEAK CAUTION: Low-Thermal NO INTERNAL OPERATOR SERVICEABLE PARTS, Black Input Cable SERVICE BY QUALIFIED PERSONNEL ONLY. Black PEAK Noise Shield NOTES : 1. Use only clean copper-to-copper connections.

  • Page 36: Figure 3-5 Connections For Frequency Measurements

    Operation Frequency Source KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: Low-Thermal NO INTERNAL OPERATOR SERVICEABLE PARTS, Black Input Cable SERVICE BY QUALIFIED PERSONNEL ONLY. Black PEAK Noise Shield NOTE : Use only clean copper-to-copper connections. a. Input Connections...

  • Page 37: Differential Thermocouple Temperature Measurements

    Table 3-8 summarizes the temperature configuration USER type thermocouple is included in the selection menu as it appears when the Model 1801 is enabled. Press menu. In order to use this selection, you must enter the CONFIG TEMP to access this menu, then make your thermocouple slope (coefficient) in µV/°C.
  • Page 38 µV/°C as follows: 1. Connect the two thermocouples to the Model 1801 input in a differential configuration, as shown in Fig- SLOPE=+00020.0 µV/¡C ure 3-6.

  • Page 39: Figure 3-6 Connections For Differential Temperature Measurements

    Operation KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO Thermocouples connected in differential configuration PEAK CAUTION: NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY. PEAK Note: Connect leads with lower Seebeck coefficient relative to copper to preamp.
  • Page 40 Otherwise, the temperature bar graphs operate essentially in the same It is important to keep in mind that, with the Model 1801 manner as described in paragraph 3.3.2 of the Model 2001 enabled, the Model 2001 always displays the difference in Operator’s Manual.

  • Page 41: Measurement Considerations

    Measurement considerations Thermoelectric coefficients As shown in Table 3-10, the magnitude of thermal EMFs Low-level measurements made using the Model 1801 can generated depends on the particular materials involved. be adversely affected by various types of noise or other Best results are obtained with clean copper-to-copper unwanted signals that can make it very difficult to obtain...
  • Page 42 Operation Thermoelectric generation In the unlikely event that the two junction temperatures are identical, the thermal EMFs will exactly cancel Figure 3-7 shows a representation of how thermal EMFs because the generated potentials oppose one another. are generated. The test leads are made of the A material, More often, the two junction temperatures will differ, and while the source under test is the B material.

  • Page 43: Source Resistance Noise

    Model tive that all connecting surfaces are kept clean and free of 1801 measurements. The paragraphs below discuss the oxides. As noted in Table 3-2, copper-to-copper oxide generation of Johnson noise as well as ways to minimize junctions can result in thermal EMFs as high as 1mV/°C.

  • Page 44: Magnetic Fields

    fields, so care must be taken method available to reduce noise. Again, however, the to keep the Model 1801, signal source, and connecting cables a good distance away from these potential noise available reduction is not as large as it might seem because the reduction is related to the square root of the sources.

  • Page 45: Electromagnetic Interference (Emi)

    Proper shielding of all signal paths and sources being uate the troublesome signal. measured is important to minimize noise pickup in virtu- The Model 1801 filters may help to reduce EMI effects in ally any low-level measurement situation. Otherwise, interference from such noise sources as line frequency some situations.

  • Page 46: Figure 3-10 Power Line Ground Loops

    Operation Experiment Preamplifier (source) Ground 1 Ground 2 Ground bus Input voltage to the preamplifier is: + I R Resistance of input LO connection (typically around 100mΩ) Current passing through input LO connection due to ground voltages ) in the ground bus (magnitude may be amperes).

  • Page 47: Figure 3-11 Eliminating Ground Loops

    Operation Experiment Preamplifier (source) Single System Ground Ground bus Input voltage to the preamplifier is: + I R Resistance of input LO connection (typically around 100mΩ) Current passing through Z (MΩ or GΩ) due to V and currents in the source (magnitude is typically hundreds of nA’s).

  • Page 48: Introduction

    Model 1801 should be allowed to warm up before The procedures in this section are intended to verify that testing. Model 1801 accuracy is within the limits stated in the Line power: Covers power line voltage ranges dur- preamplifier one-year specifications (see Appendix A).

  • Page 49: Line Power

    The Model 1801 must be allowed to warm up for at least two hours before performing the verification procedures. If the preamplifier has been subjected to temperature Verification limits...

  • Page 50: Restoring Default Conditions

    Performance Verification Restoring default conditions If the Model 1801 is out of specifications and not under warranty, refer to the calibration procedures in Section 5. Before performing each performance verification proce- dure, restore Model 1801 default conditions as follows: WARNING The maximum common-mode voltage 1.
  • Page 51 Sense Output Input Output LO NOTE : Put calibrator in external sense mode, and use 2.2V range. Sense LO KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.
  • Page 52 13. Repeat the procedure for each of the ranges with neg- ENTER. ative Model 1801 input voltages of the same magni- D. Press EXIT to return to normal display. tude as those listed in Table 4-2. Set the divider to the 6.

  • Page 53: Ac Volts Verification

    @ 100Hz 477.500µV measurements. Note: Limits shown do not include calibrator uncertainty. 2. Connect the calibrator to the Model 1801 input, as shown in Figure 4-2. 3. Restore Model 1801 factory default conditions, as explained in paragraph 4.7. 4.8.3 Resistance verification 4.
  • Page 54 Performance Verification 5700A Calibrator (Output DC Volts) Output HI Output LO KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY. Supplied Low-thermal Cable PEAK a. Input Connections Input HI...

  • Page 55: Service Information

    5.2.2 Warm-up period Troubleshooting: Presents some troubleshooting tips for the Model 1801. The Model 1801 must be allowed to warm up for at least two hours before calibration. If the preamplifier has been subjected to temperature extremes (outside the range Calibration stated in paragraph 5.2.1), allow additional time for inter-...

  • Page 56: Line Power

    Part # R-336-10K Low-thermal Resistor*** 10kΩ, ±5% * 90-day calibrator specifications shown include total uncertainty at specified output. Model 262 specifications are for one year. ** Low-thermal shorting strap is supplied with the Model 1801. ***Remove plating from leads before use.

  • Page 57: Figure 5-1 Connections For Offset Voltage Adjustment

    Service Information Offset Voltage Adjustment KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY. PEAK Low-thermal Shorting Strap Figure 5-1 Connections for offset voltage adjustment KEITHLEY 1801 NANOVOLT PREAMP...

  • Page 58: Normal Calibration

    Normal calibration should be performed at least once a 8. Select CALIBRATE, then press ENTER. The instru- year, or every 90 days to ensure the Model 1801 meets the ment will then prompt you to complete the precal corresponding specifications.

  • Page 59: Figure 5-3 Calibration Connections

    Sense Output Input Output LO NOTE : Put calibrator in external sense mode, and use 2.2V range. Sense LO KEITHLEY 1801 NANOVOLT PREAMP INPUTS V ZERO I ZERO PEAK CAUTION: NO INTERNAL OPERATOR SERVICEABLE PARTS, SERVICE BY QUALIFIED PERSONNEL ONLY.
  • Page 60 IEEE-488 bus calibration procedure Set 262 to 10^3 Follow the steps below to calibrate the Model 1801 over the IEEE bus. Table 5-2 lists IEEE-488 bus calibration commands, and Table 5-3 summarizes the bus calibration Set the Model 262 divider ratio to 10 , then press procedure.

  • Page 61: Table 5-2 Model 1801 Ieee-488 Bus Calibration Commands

    Service Information Table 5-2 Model 1801 IEEE-488 bus calibration commands Command Description :CALibration Calibration root command. :UNPRotected Commands not protected by CAL switch. :PREamp Preamp commands. :G1K <value> Directly enter 2mV gain (min = 0.5; max = 1.5; default = 1.0).
  • Page 62 Service Information 5. Use the GPIB MENU to set the Model 2001 primary 17. Set the Model 262 divider ratio to 10 , then press address to the value used in the controller program ENTER. (default = 16). 18. Send the following command string over the bus: 6.

  • Page 63: Gain Constants Calibration

    Service Information Calibration errors supply card. The basic procedures for reading and storing constants are explained in the following paragraphs. One of the errors listed in Table 5-4 may occur during the course of calibration. (These errors will appear on the front panel and may be obtained over the bus by using the Reading gain constants :SYST:ERR? query.) The most likely causes of these...

  • Page 64: Principles Of Operation

    Storing Constants from the Front Panel The following paragraphs discuss the basic operating principles for the Model 1801, and can be used as an aid To enter gain constants from the front panel, select in troubleshooting the preamplifier. Refer to drawing...

  • Page 65: Figure 5-4 Block Diagram

    Service Information To 2001 Input 2001 Power Connector Gain/Filter Switching Common-Mode Current Cancellation Circuit Gain/Filter Switching Memory X1k, 2001 X10k, or Supply X100k Gain Preamp/ ± 9V Power Preamp Power Supply Supply Supplies Cable Power Supply Card Preamp Module Inputs (2mV max) LO HI Figure 5-4...

  • Page 66: Special Handling Of Static-Sensitive Devices

    Note that data transmission is 5.5.1 Troubleshooting equipment performed serially. Table 5-5 summarizes recommended equipment for trou- bleshooting the Model 1801. The gain and filter control circuits include U101, U106, AT101 through AT104, and associated components. Serial Table 5-5...

  • Page 67: Table 5-6 Power Supply Card Troubleshooting Procedure

    Service Information Table 5-6 Power supply card troubleshooting procedure Step Item/component Required condition Comments U103, pin 3 4.8kHz, 50% duty cycle square wave Referenced to digital common (P1034, pin 1). T102, pin 6 0.2V p-p rounded square wave Referenced to U104, pin 1 -8.5V DC, ±10% Referenced to...

  • Page 68: Replaceable Parts

    Replaceable Parts Introduction Factory service This section contains replacement parts information, If the preamplifier is to be returned to Keithley Instru- schematic diagrams, and component layout drawings for ments for repair, perform the following: the Model 1801. • Complete the service form at the back of this manual, and include it with the card.

  • Page 69: Table 6-1 Electrical, Parts List

    Replaceable Parts Table 6-1 Electrical, Parts List Keithley Circuit Designation Description Part Number AT101-104 IC, PHOTO COUPLER, PS2501A-1 IC-670 C101 CAP, 5600PF, +/-1%, 50VDC, DIPPED MICA C-362-5600P C102-105, 109, 119,121 CAP, 10UF, 20%, 20V, TANTALUM C-179-10 C106, 117 CAP, 1500PF, 10%, 1000V, CERAMIC...

  • Page 70: Table 6-2 Mechanical, Parts List

    Replaceable Parts Table 6-2 Mechanical, Parts List Keithley Description Part Number CABLE ASSEMBLY 1801-304 SHIELDED COVER, BOTTOM 1801-301 CABLE CLAMP CC-18 SHIELDED COVER, BOTTOM V-1801-301 STRIP, POLYURETHANE 2001-345-1 SHIELDED COVER, TOP 1801-303 SHIELDED COVER, TOP V-1801-303 SHIELD, SCANNER BOTTOM 2001-341...

  • Page 73: Specifications

    Specifications...

  • Page 77: Calibration Programs

    This appendix includes programs written in QuickBASIC as well. Be sure to use shielded IEEE-488 cables for and Turbo C to aid you in calibrating the Model 1801. See bus connections. paragraph 5.2 in Section 5 for details on offset adjust- 2.
  • Page 78 Calibration Programs Program B-1. Calibration Program for Use with Any Suitable Calibrator (QuickBASIC Version) ' Model 1801 calibration program for use with any suitable ' DC voltage calibrator. OPEN "\DEV\IEEEOUT" FOR OUTPUT AS #1 ' Open IEEE-488 output path. OPEN "\DEV\IEEEIN" FOR INPUT AS #2 ' Open IEEE-488 input path.
  • Page 79 ' Check for 1801. PRINT #1, "OUTPUT 16;*OPT?" PRINT #1, "ENTER 16" LINE INPUT #2, OPT$ IF INSTR(OPT$, "1801") = 0 THEN PRINT "Model 1801 is not installed; program aborted." END IF RETURN CmdList: DATA "Set 262 divider ratio to 10^2.","Z1K"...
  • Page 80 Calibration Programs Program B-2. Calibration Program for Use with Any Suitable Calibrator (Turbo C Version) /* Model 1801 calibration program for use with any suitable DC voltage calibrator. */ #include "ieeeio.h" #include <stdio.h> #include <stdlib.h> #include <conio.h> #include <string.h> main() static char *msg[] = { "Set 262 divider ratio to 10^2.",...
  • Page 81 16\n"); ieeescnf("%d",&stat); ieeewt("spoll 16\n"); ieeescnf("%d",&stat); void errcheck() /* Check for error. */ char errbuf[100]; ieeewt("output 16;:syst:err?\n"); ieeewt("enter 16\n"); ieeerd(errbuf); if (atoi(errbuf) !=0){ printf("%s\n",errbuf); printf("Calibration aborted.\n"); exit(1); void checkopt() /* Check for 1801. */ char buf[40]; ieeewt("output 16;*opt?\n"); ieeewt("enter 16\n");...
  • Page 82 Calibration Programs Program B-2. Calibration Program for Use with Any Suitable Calibrator (Turbo C Version) Continued ieeerd(buf); if (strstr(buf,"1801") == NULL){ printf("Model 1801 is not installed;" " program aborted.\n"); exit(1);...
  • Page 83 Calibration Programs Program B-3. Calibration Program for Use with Fluke 5700A Calibrator (QuickBASIC Version) ' Model 1801 calibration program for use only with the ' Fluke 5700A calibrator. OPEN "\DEV\IEEEOUT" FOR OUTPUT AS #1 ' Open IEEE-488 output path. OPEN "\DEV\IEEEIN" FOR INPUT AS #2 ' Open IEEE-488 input path.
  • Page 84 ' Check for 1801. PRINT #1, "OUTPUT 16;*OPT?" PRINT #1, "ENTER 16" LINE INPUT #2, OPT$ IF INSTR(OPT$, "1801") = 0 THEN PRINT "Model 1801 is not installed; program aborted." END IF RETURN CmdList: DATA "Set 262 divider ratio to 10^2.","Z1K"...
  • Page 85 Calibration Programs Program B-4. Calibration Program for Use with Fluke 5700A Calibrator (Turbo C Version) /* Model 1801 calibration program for use with the Fluke 5700A calibrator. */ #include "ieeeio.h" #include <stdio.h> #include <stdlib.h> #include <conio.h> #include <string.h> main() static char *msg[] = { "Set 262 divider ratio to 10^2.",...
  • Page 86 (status[11]==’0’); ieeewt("output 16;*esr?\n"); ieeewt("enter 16\n"); ieeescnf("%d",&stat); ieeewt("spoll 16\n"); ieeescnf("%d",&stat); void errcheck() /* Check for error. */ char errbuf[100]; ieeewt("output 16;:syst:err?\n"); ieeewt("enter 16\n"); ieeerd(errbuf); if (atoi(errbuf) !=0){ printf("%s\n",errbuf); printf("Calibration aborted.\n"); exit (1); void checkopt() /* Check for 1801. */ B-10...
  • Page 87 Calibration Programs Program B-4. Calibration Program for Use with Fluke 5700A Calibrator (Turbo C Version) Continued char buf[40]; ieeewt("output 16;*opt?\n"); ieeewt("enter 16\n"); ieeerd(buf); if (strstr(buf,"1801") == NULL) { printf("Model 1801 is not installed;" " program aborted.\n"); exit(1); B-11...

  • Page 88: Ieee-488 Bus Command Summary

    IEEE-488 Bus Command Summary Table C-1 summarizes IEEE-488 bus commands associated exclusively with the Model 1801. Refer to the Model 2001 Operator’s Manual for additional commands that can be used with the Model 1801. Table C-1 IEEE-488 bus command summary...
  • Page 89 IEEE-488 Bus Command Summary Table C-1 (Continued) IEEE-488 bus command summary Command Description :CALibration Calibration commands. :UNPRotected Commands not protected by CAL switch. :PREamp Preamp commands. :G1K <value> Directly enter 2mV gain. :G1K? Request 2mV gain constant. :G10K <value> Directly enter 200µV gain. :G10K? Request 200µV gain constant.
  • Page 90 Recommended test equipment 4-2 Model 2001 compatibility 1-3 Repacking for shipment 1-2 Electromagnetic interference 3-22 Replaceable parts 6-1 Enabling Model 1801 operation 3-2 Resistance verification 4-6 Environmental conditions 4-1, 5-1 Restoring default conditions 4-3 Normal calibration 5-4 Factory service 6-1...
  • Page 91 Safety symbols and terms 1-2 Thermoelectric potentials 3-18 Verification limits 4-2 Service information 5-1 Troubleshooting 5-12 Verification procedures 4-3 Shielding 3-22 Troubleshooting access 5-12 Shipment contents 1-2 Troubleshooting equipment 5-12 Source resistance noise 3-20 Troubleshooting procedure 5-12 Special handling of static-sensitive devices 5-12 Warm-up period 4-2, 5-1 Specifications 1-2, A-1...
  • Page 92 Service Form Model No. Serial No. Date Name and Telephone No. Company List all control settings, describe problem and check boxes that apply to problem. Intermittent Analog output follows display Particular range or function bad; specify IEEE failure Obvious problem on power-up Batteries and fuses are OK Front panel operational All ranges or functions are bad...
  • Page 93 Specifications are subject to change without notice. All Keithley trademarks and trade names are the property of Keithley Instruments, Inc. All other trademarks and trade names are the property of their respective companies. Keithley Instruments, Inc. 28775 Aurora Road • Cleveland, Ohio 44139 • 440-248-0400 • Fax: 440-248-6168 1-888-KEITHLEY (534-8453) •...

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