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385700-4006-006
Attach a voltmeter to J4-3 on the Alarm I/O board. (PA input alarm test point). TP1 or TP2
can be used as the ground connection. Refer to Figure 1-3 DLA Internal View for the location
of the Alarm and Control Interface Board test points. Standard 0.080 test probes should be
used for test points.
Adjust R1 (Input Alarm Set) on the PA module for TP3 to go to the high condition (≥ 3 VDC),
low (≤1 VDC), and then high again. Reduce the signal generator level by 2 dB and verify that
the alarm is asserted. Increase the signal generator level by 4 dB and verify that the alarm is
negated. If needed, readjust R1 and repeat this process as necessary.
2.5.2.2.3
PA Output Adjustment
Set the signal generator output to RF ON at the nominal input level (i.e. 0 dBm).
maximum input level is +5 dBm. Adjust R2 (Output Power Set) on the PA module to obtain
the desired amplifier output level. Note that the actual level measured will depend on the
attenuation used on the spectrum analyzer or power meter.
2.5.2.2.4
PA Output Alarm Adjustment
Attach a voltmeter to J4-1 on the Alarm I/O relay board. (P.A. output Alarm test point). TP1 or
TP2 can be used as the ground connection.
Adjust the signal generator level as necessary to obtain 10 dB below the desired output power
as observed at J3 (FWD OUT/RVS IN) port. If this level exceeds the range of the output
detector, the detector should be set to its minimum detectable level.
Adjust R3 (output Alarm Set) on PA for high condition (> 3 VDC), low (< 1.0 VDC), and then
high again. Reduce the signal generator level until the alarm is asserted. Verify that the output
level is ± 2 dB of the desired level. If needed, readjust R3 and repeat this process as
necessary.
Document use is restricted to that described on cover
INSTALLATION
The
2-11
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