Contents 5
Contents
Chapter 1 3458A Calibration Introduction
Introduction ............................................................. 7
Calibration Security ................................................. 7
Security Code .....................................................7
Changing the Security Code ............................... 8
Hardware Lock-Out of Calibration ....................9
Number of Calibrations ...................................... 9
Monitoring For CAL Violations ....................... 10
Monitoring Calibration Constants ......................... 10
Chapter 2 Operational Verification Tests
Introduction ........................................................... 13
Operational Tests ...................................................13
Required Equipment ......................................... 13
Preliminary Steps ............................................. 13
2-Wire Ohms Function Offset Test ..................14
4-Wire Ohms Function Gain Test .................... 15
DC Voltage Function Gain Test .......................15
DC Voltage Function Offset Test .....................17
Chapter 3 Adjustment Procedures
Introduction ........................................................... 21
Required Equipment ..............................................21
Preliminary Adjustment Procedure ....................... 22
Front Terminal Offset Adjustment ........................ 23
Rear Terminal Offset Adjustment ......................... 24
DC Gain Adjustment ............................................. 24
Resistance and DC Current Adjustment ...........26
AC Adjustment ...................................................... 27
Chapter 4 Performance Verification Tests
Introduction ........................................................... 33
Required Equipment .........................................33
Test Card ..........................................................33
Calibration Cycle ..............................................33
Test Considerations ..........................................34
General Test Procedure ....................................36
DC Voltage Performance Tests ............................. 38
Required Equipment .........................................38
Preliminary Steps ............................................. 38
DC Voltage Function Offset Test .................... 39
DC Voltage Function Gain Test ...................... 39
Analog AC Voltage Performance Tests ................ 41
Required Equipment ........................................ 41
Preliminary Steps ............................................. 41
AC Voltage Test Procedure ............................. 41
DC Current Performance Tests ............................. 43
Required Equipment ........................................ 43
Preliminary Steps ............................................. 43
DC Current Function Offset Test ..................... 44
DC Current Function Gain Test ....................... 44
Ohms Performance Tests ...................................... 45
Required Equipment ........................................ 45
Preliminary Steps ............................................. 45
2-Wire Ohms Function Offset Test .................. 46
4-Wire Ohms Function Offset Test (Rear
Terminals) ........................................................ 47
4-Wire Ohms Function Gain Test .................... 47
Frequency Counter Performance Tests ................. 48
Required Equipment ........................................ 48
Preliminary Steps ............................................. 48
Frequency Counter Accuracy Test ................... 49
Chapter 5 Command Summary
ACAL ............................................................... 62
CAL .................................................................. 64
CAL? ................................................................ 65
CALNUM? ...................................................... 73
CALSTR .......................................................... 74
REV? ................................................................ 75
SCAL ............................................................... 76
SECURE .......................................................... 77
TEMP? ............................................................. 79
TEST ................................................................ 80
Appendix A Specifications
Appendix B Electronic Calibration of the 3458A
(Product Note 3458A-3)
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