TB 9-4920-456-24
Table 1. Calibration Description Continued.
Test instrument parameters
Performance specifications
Counter/decoder test, consisting
of:
Top and bottom counter
Range: External pulse input of 1000 1 Hz
response
Accuracy: TI counters indicate within 1 count of frequency
counter
Top and bottom decoder
Range: SIF code inputs: 0000, 1111, 2222, 3333, 4444, 5555,
response
6666, 7777
Accuracy: TI display: 0000, 1111, 2222, 3333, 4444, 5555,
6666, 7777
P2 pulse displacement for top
Range: 20.350 ms
and bottom decoder
Accuracy: SIF code will disappear from TI display before delay
is more than 20.5 ms and less than 20.10 ms
Mode 4 reply pulse
Range: 3.60 ms
displacement
Accuracy: 0.35 ms
Top and bottom reply decoder
Range: 500 Hz
response
Accuracy: 1 Hz
Programmable attenuator
Range: -20 to -99 dBm
(top or bottom channel)
Accuracy: -20 to -60 dBm 1.25 dB
-60 to -70 dBm 0.75 dB
-70 to -80 dBm 0.5 dB
-80 to -85 dBm 0.75 dB
-85 to -99 dBm 1.65 dB
reference
Accuracy: 0.5 dB
Reply path insertion loss
UPM 137 path:
19.5 dB
(top or bottom channel)
Accuracy: 1.5 dB and within 0.5 dB of calibration label value
APM 305 path:
Insertion loss: 6 dB or less, and within 0.5 dB of calibration
label value
Cable insertion loss
Loss value marked on each cable:
Accuracy: 0.1 dB of value listed on cable
VSWR
Mismatch unit 4049398:
Return loss: Between 5.105 and 5.435 dB
Termination 4049397:
Return loss: 26.45 dB or greater
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