TB 9-6625-2328-35
IDENTIFICATION AND DESCRIPTION
calibration of Digital Electronic Counter AN/USM-459B. TM 9-6625-907-12 and TM 9-
6625-907-40 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 . None.
hours, using the dc and low frequency technique.
prescribed by TB 750-25.
b. Software corrections will be reported by parameter; i.e. time interval, sensitivity,
timebase. Report only those software corrections made.
pertain to this calibration are listed in table 1.
Test instrument parameters
Performance specifications
Frequency
Range: Channel 1 and 2: Dc to 225 MHz
Channel 3: 100 MHz to 1.3 GHz
Accuracy: ( Timebase 300 ps/gate time x frequency)
Peak volts
Range: -5.1 to +5.1 V
Accuracy: AC signals: (100 Hz to 30 MHz > 100 mV p-p)
25 mV + 10% of V
DC signals: 25 mV + 2% of V
Sensitivity
Channel 1 and 2: 20 mV rms (-21 dBm): dc to 100 MHz
30 mV rms (-17.5 dBm): 100 to 200 MHz
40 mV rms (-15 dBm): 200 to 225 MHz
Channel 3:
-27 dBm: 100 MHz to 1.3 GHz
Timebase
Frequency: 10 MHz
Stability: < 5 x 10-10 per day
Time interval
Range: -1 ns to 105 s
Accuracy: (Timebase x time interval) trigger level timing error
1.5 ns
Trigger level
Range: -5.125 to +5.125 V
Accuracy: 15 mV + 1% of trigger level reading
