Agilent Technologies 3458A Manual de Instruções Página 28
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26 Chapter 3 Adjustment Procedures
Resistance and DC
Current Adjustment
This adjustment calculates gain corrections for the resistance and DC current
ranges. The DC Gain Adjustment must be performed prior to this adjustment
because this adjustment relies on the values calculated by the DC Gain
Adjustment.
Note When offset compensated ohms is enabled (OCOMP ON command), the
default delay time used by the multimeter for this adjustment is 50ms
(50ms is the settling time used after the current source is switched on or
off). For most resistance standards and cabling, this provides adequate
settling time for the measurements made during the adjustment. If,
however, the resistance standard and/or cabling has slow transient response
or high dielectric absorption you should specify a longer delay. You can
determine this experimentally prior to performing the following adjustment
by measuring the resistance standard using a 50ms delay and then
measuring it using a much longer delay (e.g., 1 second). If the two
measurements are significantly different, you should use a longer delay in
the adjustment procedure. You must specify the longer delay using the
DELAY command prior to executing the CAL command (step 5). For
example, to specify a 200ms delay execute: DELAY 200E-3. The
multimeter will then use the specified delay in the adjustment. If a value of
less than 50ms is specified, the multimeter will automatically use a delay of
50ms. Do not specify a delay longer than 60 seconds; a delay >60 seconds
will adversely affect the adjustment.
Equipment required: A 10kΩ resistance standard (the resultant accuracy
of the multimeter depends on the accuracy of the resistance standard used).
Note Resistance standards from 1kΩ to 12kΩ can be used for the procedure.
However, using a resistance standard <10kΩ will degrade the multimeter's
accuracy specifications.
1. Select the 4-wire ohms measurement function (use the shifted OHM
key).
2. Execute the OCOMP ON command (use the front panel Offset Comp
Ω key).
Note You can perform this adjustment with offset compensation disabled
(OCOMP OFF command). This eliminates the settling time requirement
(DELAY command) when dealing with high dielectric absorption in the
adjustment setup (see note as the beginning of this adjustment). However,
with offset compensation disabled, any offset voltages present will affect
the adjustment. For most applications, we recommend enabling offset
compensation for this adjustment.
- Keysight 3458A 1
- Multimeter 1
- Safety Symbols 5
- WARNINGS 5
- Documentation History 5
- DECLARATION OF CONFORMITY 6
- Contents 7
- 6 Contents 8
- Calibration Security 9
- Changing the 10
- Security Code 10
- Hardware Lock-Out of 11
- Calibration 11
- Number of 11
- Calibrations 11
- Monitoring For CAL 12
- Violations 12
- Rated Input Maximum 13
- Non-Destructive Input 13
- Introduction 15
- Operational Tests 15
- 2-Wire Ohms 16
- Function Offset Test 16
- 4-Wire Ohms 17
- Function Gain Test 17
- DC Voltage Function 17
- Gain Test 17
- Offset Test 19
- Required Equipment 23
- Figure 1. 4-Terminal Short 25
- DC Gain Adjustment 26
- Resistance and DC 28
- Current Adjustment 28
- AC Adjustment 29
- 3458A Adjustment Record 34
- General Test 38
- Procedure 38
- DC Voltage Performance Tests 40
- AC Voltage Test 44
- DC Current Performance Tests 46
- DC Current Function 47
- Ohms Performance Tests 48
- (Rear Terminals) 50
- Frequency Counter 52
- Accuracy Test 52
- DC VOLTAGE TESTS 53
- AC VOLTAGE TESTS 55
- DC CURRENT TESTS 57
- OHMS TESTS 59
- FREQUENCY TESTS 61
- ±0.000500 Hz ±0.000500 Hz 61
- ±00.00100 MHz ±00.00100 MHz 61
- Chapter 5 Command Summary 63
- Syntax CALNUM? 75
- Examples CALSTR 76
- Syntax REV? 77
- Examples Changing the Code 79
- Disabling Security 80
- Syntax TEMP? 81
- Syntax TEST 82
- Appendix A Specifications 83
- 1 / DC Voltage 84
- 2 / Resistance 85
- 2 Accuracy 86
- 3 / DC Current 87
- 4 / AC Voltage 88
- Settling Characteristics 89
- 5 / AC Current 93
- 6 / Frequency/ Period 94
- 7 / Digitizing Specifications 95
- Voltage 96
- 8 / System Specifications 97
- 9 / Ratio 98
- 10 / Math Functions 98
- 11 / General Specifications 99
- 3458A (Product Note 3458A-3) 101
- Four-wire short 102
- 10 V DC voltage standard 102
- 10 kΩ resistance standard 102
- DC Gain Adjustments 103
- Offset Adjustments 103
- One-time Adjustments 106
- Traceability 106
- Internal Reference Constants: 107
- *03458-90017* 109
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