Keithley 617 User Manual

Model 8573 Programming Example-Load the modified
DECL.BAS file into the IBM computer (see the Model 8573
Instruction Manual) and add the lines below:
PROGRAM COMMENTS
10 NA$=“GPIBO” :CALL IBFIND Find the board
(NA$,BRDO%) descriptor.
20 NA$= “DEVO” :CALL IBFIND Find the instrument
(NAS,M617% ) descriutor.
30 V% =27:CALi IBPAD
(M617%,V%)
40 V% = l:CALL IBSRE
(BRDO%,V%):CALL
Set phmary address
to 27.
Send remote enable,
clear instrument.
IBCLR(M617%)
50 CMDS = “M32X” :CALL
IBWRT(M617%,CMD$l
60 CMD$=“KSX”:CALL IBWRT
(M617%,CMD$l
70 PRINT”B7 B6 B5 B4 83 B2 Bl
80”
80 MASK % = 128
90 CALL IBRSP(M617%,SB%)
100 FORI =1TO8
110 IF (SB% AND MASK%)=0
THEN PRINT “0”; ELSE
PRINT “1 “;
120 MASK%=MASK%/2
130 NEXT I
Program for SRQ on
aTor.
Attempt to program
illegal option.
Identify the bits.
Define bit mask.
Serial poll the instm-
merit.
Loop eight times.
Mask off the bits
and display them.
140 PRINT
150 V% =O:CALL
IBONL(BRDO%,V%)
Close the board file.
160 CALL IBONL(M617%,V%) Close the instrument
file.
To run the program press the F2 function key. After placing
the instrument in remote (line 40). the program then sets the
SRQ mode (line 50). An attempt is made to program an illegal
command option (line 60). at which point the instrument
generates an SRQ and sets the error and RQS bits in its
status byte. Other bits may also be set depending on instru-
ment status. Lines 70-90 display the bit positions, set the
mask value to the most significant bit, and serial poll the in-
strument. Since the status byte is in decimal form, lines
100-130 are used to generate the binary equivalent of the
status byte value.
KO=Send EOI with last byte; hold off bus until commands
processed on X
Kl=Do not send EOI with last byte; hold off bus until com-
mands processed on X
K2=Send EOI with last byte; do not hold off bus on X
IW=Send no EOI with last byte; do not hold off bus on X
Upon power up, or after the instrument receives a DCL or
SDC command, the KQ mode is enabled.
The EOI line on the IEEE-486 bus provides a method to
positively identify the last byte in a multi-byte transfer se-
quence. Keep in mind that some controllers rely on EOI to
terminate their input sequences. In this case, suppressing EOI
with the K command may cause the controller input sequence
to hang unless other terminator sequences are used.
The bus hold off mode allows the instrument to temporarily
hold up bus operation when it receives the X character until it
processes all commands sent in the command string. The pur-
pose of the hold off is to ensure that the front end FETs and
relays are properly configured before taking a reading. Keep
in mind that all bus operation will cease-not just activity
associated with the Model 617. The advantage of this mode is
that no bus commands will be missed while the instrument is
processing commands previously received.
The hold off period depends on the commands being process-
ed. Table 3-14 lists hold off times for a number of different
commands. Since a NRFD hold off is employed, the hand-
shake sequence for the X character is completed.
HP-85 Programming Example-To program the instm-
ment for the K2 mode, enter the following statements into the
HP-85:
REMOTE 727 (END LINE)
OUTPUT 727;“K2x” (END LINE)
When the second statement is executed, the instrument will be
placed in the K2 mode. In this mode, EOI will still be
transmitted at the end of the data string, but the bus hold-off
mode will be disabled.
3.10.16 EOI and Bus Hold-off Modes (K)
Model 8573 Programming Example-To place the instm-
ment in the K2 mode, enter the following statements into the
IBM computer:
The K command allows control over whether or not the in-
strument sends the EOI command at the end of its data string,
V%=l:CALL IBSRE(BRDO%,V%) (return)
and whether or not bus activity is held off (through the NRFD
CMD$=“KZX”:CALL IBWRT(M617%,CMD$) (retom)
line) until all commands sent to the instrument are internally
processed once the instrument receives the X character. K
command options include:
The Model 617 will be placed in the K2 mode when the se-
cond statement is executed. The EOI mode will be enabled,
but the bus hold off will be disabled.
3-30

Keithley 617 Specifications

General

Brand	Keithley
Model	617
Category	Measuring Instruments
Language	English

Summary

Warranty Information

Warranty

Details the warranty terms and conditions for the product and specific components.

Specifications

Specifications

Details the electrical and performance specifications for the Model 617 electrometer.

Safety Precautions

Safety Precautions

Advises on essential safety measures to avoid injury and instrument damage during operation.

Section 1: General Information (Continued)

Unpacking and Getting Started

Details unpacking, inspection, and initial steps to operate the Model 617.

Section 2: Operation

2.2 Power Up Procedure

Details the steps for connecting power and turning on the instrument.

2.3 Power Up Self Test and Display Messages

Explains the self-test routine and potential display messages upon startup.

Section 2: Operation (Continued)

2.4 Front Panel Familiarization

Provides an overview of the Model 617's front panel layout, controls, and indicators.

2.7 Basic Measurement Techniques

Introduces fundamental procedures for making voltage, resistance, charge, and current measurements.

2.7.2 Input Connections

Details how to connect input signals to the rear panel INPUT connector.

2.7.4 Guarded Operation

Explains the concept and application of guarding to minimize leakage and improve measurements.

2.7.5 Making Current Measurements

Details the procedure for measuring low-level currents, including picoampere ranges.

2.7.6 Making Charge Measurements

Describes how to measure charge using the Model 617's coulombs ranges.

2.7.7 Resistance Measurements

Explains how to measure resistance using constant current and voltage methods.

2.8 Using The Voltage Source

Explains how to use the Model 617's built-in voltage source for V/I measurements.

2.10 Using External Feedback

Explains how to extend capabilities using external feedback networks.

2.11 Using Zero Correct and Baseline Suppression

Covers instrument offset cancellation and baseline value storage.

2.11.2 Using Suppression

Details how to store an offset value and subtract it from subsequent readings.

2.13 External Triggering

Explains how to trigger the instrument using external BNC connectors.

2.4.1 Controls

Describes the function and operation of each front panel control button.

2.5.3 Calibration

Introduces the digital calibration program for front panel or IEEE-488 bus use.

2.7.3 Making Voltage Measurements

Provides step-by-step instructions for measuring DC voltages with the Model 617.

2.8.1 Basic Operating Procedure

Guides on connecting and adjusting the voltage source output.

2.11.1 Zero Correct and Zero Check

Explains how to use Zero Correct and Zero Check to cancel internal offsets.

2.12 Data Storage

Describes the internal 100-point data store mode for logging readings.

2.13.1 External Trigger

Details continuous and one-shot triggering modes via the external trigger input.

2.14 Measurement Considerations

Discusses factors affecting measurements at low signal levels.

2.8.2 V/I Resistance Measurements

Describes how to measure high resistances using the voltage source and electrometer.

Section 3: IEEE-488 Programming

Section 3: IEEE-488 Programming (Continued)

3.4 Bus Commands

Covers device commands, grouped into uniline, multiline, and device-dependent categories.

3.7.2 Bus Connections

Details how to connect the Model 617 to the IEEE-488 bus using appropriate cables.

3.7.3 Primary Address Programming

Explains how to check and set the instrument's primary address for bus communication.

3.8 Software Considerations

Discusses software aspects for IEEE-488 controllers like HP-85 and IBM-PC.

3.9 General Bus Command Programming

Covers general bus commands like DCL, REN, IFC, LLO, GTL, SDC, GET, SPE, SPD.

3.10 Device-Dependent Command Programming

Details commands controlling modes like function, range, trigger, and data format.

3.10.2 Function (F)

Describes commands to select measurement functions like Volts, Amps, Ohms, Coulombs.

3.10.3 Range (R)

Explains commands for controlling instrument sensitivity and selecting measurement ranges.

3.10.4 Zero Correct and Zero Check (Z and C)

Details commands for canceling internal offsets and zeroing the instrument.

3.10.5 Baseline Suppression (N)

Explains commands to store an offset and subtract it from subsequent readings.

3.10.9 Voltage Source Value (V)

Details commands for programming the built-in voltage source output.

3.10.10 Voltage Source Operate (O)

3.10.12 Non-Volatile Memory Storage (L)

3.10.14 Trigger Mode (T)

3.10.15 SRQ Mask (M) and Status Byte Format

3.11.2 Number Error

3.4.5 Device-Dependent Commands

Describes commands specific to device configuration, controlling functions like mode and range.

3.10.8 Data Store Mode

Explains how to use the data store for logging readings and setting intervals.

3.10.11 Calibration Value (A)

Describes commands for setting calibration values for ranges and functions.

3.10.18 Status (U)

3.11.1 Bus Error

Section 4: Applications

4.2 Insulation Resistance Measurements

Details how to measure high insulation resistances using constant current and voltage methods.

Section 4: Applications (Continued)

4.3 High Impedance Voltmeter

Explains using the Model 617 as a high-impedance voltmeter with minimal circuit loading.

4.5 Diode Characterization

4.6 Capacitor Leakage Measurements

4.4 Low-Level Leakage Current Measurements

Guides on measuring low-level currents like nanoamperes and picoamperes.

4.7 Capacitance Measurement

4.10 Using The Model 617 With External Voltage Sources

Section 5: Performance Verification

Section 5: Performance Verification (Continued)

5.5 Verification Procedures

Provides detailed procedures for verifying accuracy of volts, ohms, amps, and coulombs functions.

5.5.3 Coulombs Verification

5.5.4 Volts Verification

5.5.5 Ohms Verification (2kΩ–20MΩ Ranges)

5.5.7 Voltage Source Verification

5.5.1 Input Current Verification

5.5.6 Ohms Verification (200MΩ and GΩ Ranges)

5.5.2 Amps Verification

Section 7: Maintenance

7.2 Line Voltage Selection

Section 7: Maintenance (Continued)

7.3 Fuse Replacement

7.4.5 Front Panel Calibration

Provides step-by-step instructions for calibrating from the front panel.

7.4.7 Calibration Sequence

7.4.11 Amps Calibration

Provides calibration steps for the amps function across various ranges.

7.4.12 Coulombs Calibration

Details the procedure for calibrating the coulombs function.

7.4.14 Ohms Calibration

Provides calibration steps for the ohms function across various ranges.

7.4.15 Voltage Source Calibration

Details the procedure for calibrating the instrument's internal voltage source.

7.6 Disassembly Instructions

7.7.2 Power Up Self Test

7.7.7 A/D Converter and Display

7.7.8 Input and Ranging Amplifiers

7.4 Calibration

Introduces digital calibration capabilities and recommendations.

7.4.6 IEEE-488 Bus Calibration

Details procedures for calibrating the instrument via the IEEE-488 bus using a computer.

7.4.8 Input Offset Adjustment

Describes steps to null any small offset in the input amplifier.

7.4.13 Volts Calibration

Outlines the calibration steps for the volts function across different ranges.

7.7 Troubleshooting

Offers guidance for diagnosing and resolving instrument problems.

7.7.3 Self Diagnostic Program

7.4.9 Input Current Adjustment

Details procedures to null input current in the input stage for temperature compensation.

7.4.10 Permanent Storage of Calibration Parameters