TB 9-6625-2151-35
IDENTIFICATION AND DESCRIPTION
1. Test Instrument
Identification.
This bulletin provides instructions for the
calibration of Transmission Impairment Test Set AN/USM-485 and Hewlett-Packard,
Model 4935A with Options 001, 002, and 003. 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. Option 001 adds rechargeable battery pack. Option 002 adds
peak/average ratio measurement. Option 003 adds both 001 and 002.
b.
Time and Technique. The time
required for this
calibration is
approximately 2
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 table 1.
Test instrument
Performance
parameters
specifications1
Receiver:
Range: 20 Hz to 110 kHz
20 to 9,999 Hz ............................ 0.5 Hz
Accuracy:
10 kHz to 110 kHz ...................... 5.0 Hz
Level (input)
Range: -40 dBm to +13 dBm
Accuracy: dBm
Frequency:
20
to
50 Hz ......................................... 1.0
50
to 200 Hz ......................................... 0.5
0.2 to
15 kHz ....................................... 0.2
15
to
85 kHz........................................ 0.5
85
to 110 kHz........................................ N/A
to +13 dBm....................................... 0.1 dBm at 1004 Hz)
(-20
See footnotes at end of table.