TB 9-6625-170-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Differential Amplifier, Ectron Corp, model, 428. 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. None.
b. Time and Technique. The time required for this calibration is approximately 2
hour, using the dc and low frequency technique.
2. Forms, Records, and Reports. Forms, records, and reports required for calibration
personnel at all levels are prescribed by TB 750-25.
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
Excitation Voltage
Range: 5 V dc, 7 v dc, and 10 V dc
Accuracy: 1.00%
Load:
0.1% no load to full load
Frequency Response
Range: DC Hz to 3 kHz
Accuracy: 5.00%
Zero
Range: 4 V
Gain
Range: 0.1 to 2500
Accuracy: 0.2%
Input Divider
Range: 0.01
Accuracy: 0.1%
Dc, 100 Ω unbalance; ≥ 140db
Common-mode rejection
Ac, 60 Hz balanced; ≥ 120db
Ac, 60 Hz 100 Ω unbalance; ≥ 100db
Ac, 400 Hz balanced; ≥ 100db
Ac, 400 Hz 100 Ω unbalance; ≥ 90db
≥ 1 MΩ, high gain range
Input Impedance
100 kΩ 5% Low gain range
≤ 1 Ω (DC), ≤ 2 Ω (at 5 kHz)
Output Impedance
EQUIPMENT REQUIREMENTS
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set, AN/GSM-286; AN/GSM-287; or AN/GSM-440. 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
