SECTION I
I D E N T I F I C A T I O N AND D E S C R I P T I O N
calibration personnel at all levels are prescribed
1 - 1 . Test Instrument Identification. T h i s
by TM 38-750. DA Form 2416 must be annotated in
bulletin provides instructions for the calibration
accordance with TM 38-750 for each calibration
of Telephone Test Set AN/PTM-7 including TS-
performed.
1323/PT. TM 11-6625-648-12 and TM 11-6625-648-
b. Adjustments to be reported on DA Form 2416
45 were used as the prime data source in compiling
are designated (R) at the end of the sentence in
t h e s e instructions. T h e e q u i p m e n t b e i n g
which they appear. When adjustments are in
calibrated will be referred to as the "TI" (test
t a b l e s , the (R) will follow the designated
instrument) throughout this bulletin.
adjustment. R e p o r t only those adjustments
a. Model Variations. None.
performed and designated with (R).
b. Time and Technique. The time required for
this calibration is approximately 1 hour, using the
1-3. Calibration Description. TI parameters
dc and low frequency technique.
and performance specifications which pertain to
this calibration are listed in table 1-1.
1-2. Calibration Data Card (DA Form 2416).
a. Forms, records, and reports required for
Table 1-1. Calibration Description
Performance
Test instrument
specifications
parameters
Test Metro
0 to 100 microampere
Current range
5%
Accuracy
2100 ohms 20%
0 to 10
Dial marking
PCM*
62 ohms
Impedence ( input and output)
30 mv, pp maximum
Input amplitude
10 mn, pp minimum
2V peak
Output amplitude
Binary dipulse
Pulse type
230 kHz maximum
Pulse rate
205 ns
Pulse width
Order wire*
62 ohms
Impedence (input and output)
300 to 1,000 Hz
Frequency response
1,600 Hz
Signaling frequency
50 to 270 uv
Transmit level
-7.5 vdc and +4.5 vdc
Voltage measurements
Bridge measurement:
0 to 6,000 ft. (0-6)
Range (dial marking)
500 ft.
Dial increment
4%
Absolute accuracy
Operating temperature:
-20 to 125F.
Range*
75F.
Normal test
`This specification is for information only and is not necessarily verified in this bulletin.
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