TB 9-4931-393-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Calibrator, Hewlett-Packard, Model 8402B. The manufacturer's instruction
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. TI's with serial numbers prefixed 610 or 613 use transistors
A1Q4 and A1Q5. TI's prefixed 739 or 811A replace A/94 and A1Q5 with A1Q8 (A-B).
b. Time and Technique. The time required for this calibration is approximately 4
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. Adjustments to be reported are designated (R) at the end of the sentence in which
they appear. Report only those adjustments made and designated with (R).
3. Calibration Description. TI parameters and performance specifications which
pertain to this calibration are listed in table 1.
Table 1. Calibration Description
Test instrument parameters
Performance specifications
Line voltage regulation1
Satisfactory performance with any line
voltage between 103.5 and 126.5 V ac
Calibration points
Range
0.01 to 2.0 mW
0.05%
Accuracy
Thermistor operating resistance
99.5 to 100.5 or 199 to 201Ω
Range
0.06%
Accuracy
1Verified
from 105 to 125 V ac.
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Sets AN/GSM-286, AN/GSM-287 or AN/GSM-705. Alternate items may be used
by the calibrating activity. The items selected must be verified to perform satisfactorily
prior to use and must bear evidence of current calibration. The equipment must meet or
provide a four-to-one ratio between the standard and TI. Where the four-to-one ratio
cannot be met, the actual accuracy of the equipment selected is shown in parenthesis.
