TB 9-6625-2045-35
SECTION I
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification. This bulletin provides instructions for calibration of
Impedance Bridge, General Radio Models 1650A and 1650B. 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.
Differences among models are listed within the text.
Adjustments and switch setting differences for model 1650B are shown in parentheses.
b. Time and Technique. The time required for this calibration is approximately 2
hours, using the dc and low frequency technique.
2. DA Form 2416 (Calibration Data Card)
a. Forms, records, and
reports required for calibration personnel at all
levels are
prescribed by TB 750-25. DA Form 2416 must be annotated in accordance with TB 750-25
for each calibration performed.
b. Adjustments to be reported on DA Form 2416 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
Model 1650A
Range: 1 mΩ to 11 MΩ in 8 ranges, ac or dc
1% mΩ (residual R ≈ 1 mΩ for ac)
Accuracy:
1% from 1Ω to 100 kΩ for dc
An external dc supply is required for 1% accuracy
above 100 kΩ and below 1Ω
Range: 1 pF to 1100 F in 7 ranges, series or parallel
1% pF (residual C ≈ 0.5 pF)
Accuracy:
Range: 1 kHz
2%
Accuracy:
Model 1650B
Range: 1 mΩ to 1.1 MΩ in 7 ranges, ac or dc
1% 1mΩ (residual R ≈ 1 mΩ) for ac
Accuracy:
1% from 1Ω to 100 kΩ for dc
And external dc supply is required for 1% accuracy
above 100 kΩ and below 1Ω
Range: 1 pF to 1100 F in 7 ranges, series of parallel
1% 1 pF (residual C ≈ 0.5 pF)
Accuracy:
Range: 1 kHz
2%
Accuracy:
2