TB 9-6625-159-24
IDENTIFICATION AND DESCRIPTION
1. Test Instrument Identification.
This bulletin provides instructions for the
calibration of Clamp Meters, Kyoritsu, Model 2608A and Extech, Models 380911F, 380912,
380920, 380947 and 380973. 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. Variations among models are described in text and tables.
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. 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
Performance specifications
parameters
Model 2608A
Ac Current
Range:
0 to 300 A @ 50/60 Hz
Accuracy: 3.0% FS
Ac voltage
Range:
0 to 600 V @ 50/60 Hz
Accuracy: 3.0% FS
Dc voltage
Range:
0 to 60 V dc
Accuracy: 3.0% FS
0 to 10 kΩ
Range:
Accuracy: (2.0% of scale length)
Temperature
Range:
-20 to +150 C
Accuracy: 5 C (0 to 100 C); 10 C (other ranges)
Model 380911F
Ac Current
Range;
0 to 600 A @ 50 to 500 Hz
Accuracy: (3.5% + 5 dgts)
Ac voltage
Range:
0 to 750 V ac @ 50 to 500 Hz
Accuracy: (2.9% rdg + 4 dgts)
Dc voltage
Range:
0 to 1000 V dc
Accuracy: (1.5% rdg + 1 dgt)
0 to 200 kΩ
Range:
Accuracy: (1.5% rdg + 3 dgts)
Range:
0 to 20 kHz
Accuracy: (0.5% rdg + 3 dgts)
Sensitivity: 40 mV rms
Temperature
Range:
-4 to +1400 F
Accuracy: (2.0% rdg + 4 dgts), -4 to <900 F;
(3.0% rdg + 4 dgts), 900 to 1400 F