CAUTION
TM 55-4920-410-13&P
(3) Set dc power supply to ON.
(4) Set TRIP TIME START switch to off (down).
Oscilloscope will indicate between 20 and 30 V p-p. If fre-
quency counter does not indicate between 1145 and 1165
Hz, adjust R101 for 1155 Hz. If specification cannot be met
go to troubleshooting Table 4-7.
(5) Set TRIP TIME START switch to ON (up). Os-
cilloscope will indicate between 20 and 30 V p-p. If fre-
quency counter does not indicate between 1085 and 1105
Hz, adjust R102, for 1095 Hz. If specification cannot be
met go to troubleshooting Table 4-7.
m. Timer Time Delay Circuit.
(1) Set dc power supply to OFF and disconnect all
equipment from equipment setup except dc power supply.
(2) Connect frequency counter and oscilloscope to
channel A to J2 TRIG and channel B to J4 T2 CAL, using
two probes and two adapters (B12 and B13). Set oscillo-
scope trigger controls to starts weep when waveform goes
from O to +20 vale.
(a)
(c)
Adjust frequency counter to accept at least a
56 V pulse before proceeding to next step.
(3) Set dc power supply switch to ON.
(4) Position frequency counter controls as listed in
through (g) below:
(a)
(b)
(c)
(d)
(e)
(f)
(g)
Slope channels to +.
Function to BA.
Trigger levels (Slightly +).
Display fully CW.
Press RESET.
SEP-COM to SEP.
Gate time switch to min.
(5) Position Test set controls as listed in (a) through
below:
(a) TRIP TIME START switch to off (down).
(b) TEST SELECT switch to 3Ø OVB.
4-10
(c) TRIP TIME START switch to on (up). TEST
IN PROCESS light goes on.
(6) Press frequency counter RESET pushbutton. If
frequency counter does not indicate between 100 and 140
ms, adjust R1 (Figure 4-6) for 120 ms. If specification can-
not be met, go to troubleshooting Table 4-7 (Fault No. 2).
(7) Set frequency counter to indicate seconds
and press RESET pushbutton.
(8) Disconnect hookup from J4 T2 CAL and recon-
nect to J3 T1 CAL.
(9) Position Test set controls as listed in (a) through
(c) below:
(a) TRIP TIME START switch to off (down).
(b) TEST SELECT to AØ UV.
(c) TRIP TIME START switch to on (up).
(10) If frequency counter does not indicate between
3.0 and 4.0s, adjust R5 for 3.5S. If specification cannot be
met, go to troubleshooting Table 4-7 (Fault No. 3).
(11) Disconnect hookup from J3 to T1 CAL and
reconnect to J4 T2 CAL.
(12) Set TRIP TIME START switch to off (down),
then to on (up). If frequency counter does not indicate be-
tween 4.5 and 5.5s, adjust R3 for 5S. If specification can-
not be met, go to troubleshooting Table 4-7 (Fault No. 4).
(13) Disconnect hookup from J4 T2 CAL and recon-
nect to J3 T1 CAL.
(14) Position Test set controls as listed in (a) through
(c) below:
(a) TRIP TIME START switch to off (down).
(b) TEST SELECT switch to UND FREQ.
(c) TRIP TIME START switch to on (up).
(15) If frequency counter does not indicate between
900 and 1100 ms, adjust R119 for 1000 ms. If specification
cannot be met, go to troubleshooting Table 4-7 (Fault
No. 5).
(16) Disconnect hookup from J3 to T1 CAL and
reconnect to J4 T2 CAL.
(17) Set TRIP TIME START switch to off (down),
then to on (up). If frequency counter does not indicate be-
