TB 9-6625-381-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Capacitance Analyzer, ZM-3/U and ZM-3A/U. 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. Front panels and input requirements vary among models.
b. Time and Technique. The time required for this calibration is approximately 2.5
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. 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: 0 to 600 V dc
Accuracy: 3% FS
Leakage voltage
Range: 0 to 60 and 0 to 600 V dc
Range: 0 to 10,000 F1
Accuracy: 5 to 100 pF, 3 pF; 100 pF to 100 F, 5%
Range: 1.1 to 10,000 MΩ2
Insulation resistance
Accuracy: 20%
Power factor
Range: 0 to 50%
Accuracy: 10%
to 1.4 F only.
1Verified
to 1000 MΩ only.
2Verified
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Sets AN/GSM-287 or AN/GSM-705. Alternate items may be used by the
calibrating activity when the equipment listed in table 2 is not available. The items
selected must be verified to perform satisfactorily prior to use and must bear evidence of
current calibration. The equipment must meet or exceed the minimum use specifications
