TB 9-6625-1213-24
Table 1. Calibration Description - Continued
Test instrument parameters
Performance specifications
Models AM-1881/U and 450A - Continued
20-dB gain
Range: 5 Hz to 1 MHz
Accuracy: 0.5 dB
Range: 2 Hz to 1.2 MHz
Accuracy: 1 dB
40 dB gain
Range: 10 Hz to 1 MHz
Accuracy: 0.5 dB
Range: 5 Hz to 2 MHz
Accuracy: 1 dB
Stability
2% with 10% change in line voltage
Distortion
<1% from 2 Hz to 100 kHz
<2% above 100 kHz
40-dB gain, less than 40 V
Noise level
20-dB gain less than 250 V (referred to input)
Model 465A
Power input requirements
115 V 10%, 50 to 400 Hz
Voltage gain
20 or 40 dB 1%
Range: 100 Hz to 50 kHz
Accuracy: 0.1 dB
Range: 5 Hz to 1 MHz
Accuracy: Less than 2 dB down
Output
>10 V open circuit and
>5 V into 50 ohms
Distortion
Range: 10 Hz to 100 kHz
Accuracy: Less than 1%
Range: 5 to 10 Hz and 100 kHz to 1 MHz
Accuracy: Less than 2%
EQUIPMENT REQUIREMENTS
4. Equipment Required. Table 2 identifies the specific equipment to be used in this
calibration procedure. This equipment is issued with Secondary Transfer Calibration
Standards Set AN/GSM-287 or AN/GSM-705. 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 exceed the
minimum use specifications listed in table 2. The accuracies listed in table 2 provide a four-
to-one ratio between the standard and TI. Where the four-to-one ratio cannot be met, the
four-to-one accuracy of the equipment selected is shown in parenthesis.
5. Accessories Required. The accessories required for this calibration are common
usage accessories, issued as indicated in paragraph 4 above, and are not listed in this