TB 9-6625-2335-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Multimeter, Hewlett-Packard, Model 3457A. The manufacturer's manual was
used as the prime data source in compiling these instructions. The equipment being
calibrated will be referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. None.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the dc and low frequency technique.
2. Forms, Records, and Reports
a. Forms, records, and reports required for calibration personnel at all levels are
prescribed by TB 750-25.
b. All software adjustments made are reportable. Report software adjustments made
using parameter and range failing performance check; i.e., 3 V dc, 300 V ac.
3. Calibration Description. TI parameters and performance specifications that pertain
to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
Accuracy: (% of reading + No. of counts)1
Dc volts
Range
30 mV
0.0045 + 385
300 mV
0.0035 + 40
3V
0.0025 + 7
30 V
0.0040 + 20
300 V
0.0055 + 7
Accuracy: (% of reading + No. of counts)1
Dc current
Range
A
0.04 + 104
300
3 mA
0.04 + 104
30 mA
0.04 + 104
300 mA
0.08 + 204
1A
0.08 + 604
(% of reading + No. of counts)1, 2
Ac volts true
Accuracy:
rms
Range
30 mV to 30 V
300 V
20
to
45 Hz
0.6 + 1320
0.66 + 1320
45
to
100 Hz
0.25 + 1320
0.31 + 1320
100 Hz
to
20 kHz
0.17 + 1320
0.23 + 1320
3
400 Hz
to
20 kHz
0.18 + 1320
0.24 + 1320
20
to
100 kHz
0.7 + 2300
1.1 + 3900
100
to
300 kHz
3.2 + 9900
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300 kHz
to
1 MHz
10.2 + 66600
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