TB 9-6625-2217-35
SECTION I
IDENTIFICATION AND DESCRIPTION
This bulletin provides instructions for the
1. Test Instrument Identification.
calibration of Digital Electronic Counter, AN/USM-459A (Racal Dana, Model 1992, Options
04E and 55). The manufacturer's manual and TM 11-6625-3232-40 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.
and option 55 is the GPIB interface.
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
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 in table 1.
Table 1. Calibration Description
Test instrument
parameters
Performance specifications
Timebase
Frequency: 10 MHz
Aging rate: < 1 x 10-9 per day after 48 hours operation
Line variation: < 5 x 10-10 for 10% line variation
Channel A sensitivity
25 mV rms: Dc to 100 MHz (dc coupled)
10 Hz to 100 MHz (ac coupled)
50 mV rms: 100 to 160 MHz
Channel B sensitivity
25 mV rms: Dc to 100 MHz (dc coupled)
10 Hz to 100 MHz (ac coupled)
Channel C sensitivity
<15 mV rms: 40 MHz to 1 GHz
<75 mV rms: 1 to 1.3 GHz
Trigger level outputs
Range: -5.1 to +5.1 V
Accuracy: 1% V output 10 mV
2
