TM11-6625-2948-14+P
5 microseconds
(b) Pulse Width
(4) Adjust ATTENUATOR control for 0 dBm RF power
output and set MODULATION SELECTOR switch to
EXT
Amplitude
50 volts, positive
(c) Pulse Width
0.5 microsecond
(5) Set controls on MD-1075/URM as follows:
Amplitude
50 volts, positive
Control
Position
FUNCTION
lNT
(10) Repeat steps (6) through (9) except set PULSE
OUTPUT polarity to (-) in step (6) and SELECTOR switch
SELECTOR
EXT (+)
to EXT(-) in step (5).
PULSE WIDTH
Multiplier
X1
(1) Set the MODULATION SELECTOR switch to RF
PULSE WIDTH
OFF.
Vernier
Fully Clockwise
(2) Set Multimeter Triplet Model 630A on the ohms X10
(6) Set Pulse Generator HP 214A PULSE OUTPUT for the
scale and measure the resistance between ground and the
c e n t e r conductor of the RF OUTPUT connector. The
AN/USM-281C:
Pulse Rate . . . . . . . . . . . . . . . . . . . . . . . . ..4000Hz
Pulse Width . . . . . . . . . . . . . . . . . . . ..5 microseconds
The troubleshooting procedure for the signal generator is
given in Table 4-2. If the location of the trouble is
Amplitude . . . . . . . . . . . . . . . . . . . . ..5 volts, positive
indefinite or cannot be localized, start the troubleshooting
p r o c e d u r e at the step that most closely resembles the
trouble encountered. Component locations are shown in
p u l s e s (Channel A), and external synchronizing signal
(Channel B) simultaneously.
(8) Check that RF detected pulses in Channel A are stable
WARNING
and synchronized with the pulses in Channel B as the pulse
rate is reduced from 4000 HZ to 40 Hz.
A REGULATED DC VOLTAGE OF 1850
ENCOUNTERED
VOLTS WILL BE
(9) Repeat steps (6) through (8) for Pulse Generator
THE
TROUBLESHOOTING
DURING
PULSE OUTPUT for the following settings:
TESTS. DO NOT CONNECT OR DISCON-
NECT TEST EQUIPMENT WHICH CON-
(a) Pulse width
0.5 microsecond
INTERNALLY
THE
WITH
NECTS
INSTRUMENT ENERGIZED.
Amplitude
5 volts, positive