Keithley 617 User Manual

7.4.5 Front Panel Calibration
7.4.6 IEEE-488 Bus Calibration
Use the basic procedure below for each of the calibration
points listed in the following paragraphs. Zero correction
must be performed on the range being calibrated.
1. Turn off the instrument for at least three seconds if it is
presently turned on.
2. Press and hold the PROGRAM SELECT button and then
turn on power.
IEEE-468 bus calibration is performed in a manner similar to
front panel calibration, except that calibration constants are
transmitted over the bus instead of being entered from the
front panel. Also, a separate command is included to perform
NVRAM storage. By combining appropriate IEEE-486
compatible calibration equipment with a suitable test pro-
gram, calibration of the‘Model617 could be performed on an
automated basis.
3. The instrument powers up as normal, but the CAL pro-
gram is accessible in the program menu.
4. Select the function and range to be calibrated (volts, amps,
ohms, or coulombs).
Use the following basic procedure when calibrating the Model
617 over the IEEE488 bus.
5. Enable zero check and zero correct the instrument by
enabling zero correct.
6. Connect the calibration signal to the instrument. Disable
zero check.
1. Program the desired range and function over the bus. For
example, to select the 200V range and volts function, send
FOR4X.
7. Enter the front panel calibration program by pressing
PROGRAM SELECT repeatedly until the following
message is displayed:
2. Zero correct the instrument by sending ClXZlX.
3. Apply the calibration signal to the input jack. Disable zero
check by sending COX.
CAL
8. Note that the decimal points in the exponent digits indicate
that the instrument is in the calibration mode.
9. Use the voltage source arrow buttons to set the calibration
value, as Seen on the display, to agree with the actual
calibration signal. For example, with a 1.9V calibration
point, the display should be adjusted for a reading of
1.9GWV.
4. Send the required calibration value preceded by the A
command letter. For example, to calibrate the 2&W range
at the 19oV calibration point, send A19OX.
5. Repeat steps l-4 for the remaining ranges and functions.
For maximum accura~, zero correct the instrument for
each range and function.
6. After all points have been calibrated, send LlX to store
calibration constants in NVRAM.
NOTE
10. Select the next range and function to be calibrated and
repeat step 9. For maximum accuracy, the instrument
must be zero corn&ted for each range and function.
11. Once all points have been calibrated, press PROGRAM
SELECT to exit the calibration program. Assuming that
the calibration jumper is in place (paragraph 7.4.4).
calibration constants will be stored in NVRAM, and the
following message will be displayed:
NVRAM storage will not take place if the
calibration jumper is in the disabled position.
See paragraph 7.4.4 for details.
HP-85 Programming Example-The simple program
below will allow you send the desired calibration command
string to the Model 617. The program assumes that the instru-
ment primary address is at its default value of 27.
star
PROGRAM COMMENTS
Also, constants for uncalibrated ranges are derived at this
point.
12. If the calibration jumper is in the disabled position,
NVRAM storage will not take place, and the following
message will be displayed:
out
Only changed constants are affected under these condi-
tions.
10 REMOTE 727
Send remote enable.
20 DISP “CALIBR4TION
Prompt for command.
COMMAND”
30 INPUT A$
Input command string from
keyboard.
40 0LJTrIJT R7;A$
Send command string to 617.
50 GOT0 20
Repeat.
6OEND
Note, however, that the new calibration values will be used
by the instrument until the power is turned off even if
NVRAM storage does not take place.
To run the program, press the HP-85 RUN key. At the com-
mand prompt, type in the desired calibration command and
press return. For example, to perform NVRAM storage, type
in LlX and press return.
7-4

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