TB 9-6625-975-24
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CALIBRATION PROCESS FOR AUL,
MODEL 1602
Preliminary instructions......................................
Equipment setup ..................................................
Meter range ..........................................................
Voltage check ........................................................
Resistance measurement .....................................
Final procedure ....................................................
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Ohmmeters I-48( ), ZM-21( )U, AUL, Model 1602; Biddle, Models 679, 7676,
7676-1, 7679, 7679-1, and 210359. The manufacturers' manuals were used as the prime
data sources in compiling these instructions. The equipment being calibrated will be
referred to as the TI (test instrument) throughout this bulletin.
a. Model Variations. Models I-48( ) and ZM-21( )/U differ in GUARD and LINE
terminal locations. Biddle, Models 7676-1 and 7679-1 have an additional scale ranging
from 0 to 10,000 ohms, which is controlled by a range switch, reading OHMS, MEGOHMS
and DISCHARGE or MEGOHMS 1 and 10. Biddle, Model 210359 and AUL, Model
1602 range switch reads OHMS, MEGOHMS, MEGOHMS 2 and 5, MEGOHMSX2,
and DISCHARGE.
b. Time and Technique. The time required for this calibration is approximately 1
hour, 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 When adjustments are in tables, the (R) follows the designated adjustment.
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
Meter range
Range: 0 to infinity
Voltage
Range: 0 to 500 V dc
Accuracy: 5%
Range: 0 to 540 V dc1
Accuracy: 3%
Range: 0 to 1000 V dc2
Accuracy: 0.045 in. scale
See footnotes at end of table.
