C2
TM 9-4935-481-14-1
1.
Position I-22 on all three switches is blank.
(c)
The comparator outputs from J14 and J16 are then used to trigger the CT.
2.
Position I-23 on: selector A parallels A with selector B, selector B parallels B with selector A, and
selector C parallels C with selector A.
(d) If it becomes necessary to use the comparators for signals other than those appearing on selectors B and C,
the signals can be introduced through J13 and J15 after first setting selectors B and C to the I-22 positions.
3.
Position I-24 on: selector A parallels A with selector C, selector B parallels B with selector C, and
selector C parallels C with selector B.
(6) Detector simulator outputs. Because of the susceptibility of the detector A and B signals to noise, these
signals are brought out through separate connectors, J10 and J11. Connector J10 provides simulated output of tracker
(c) Refer to table 3-2 for a list of switch positions, location of the signal being monitored, and description of the
detector quadrants 2 and 4. Connector J11 provides simulated output of quadrants 1 and 3. Each connector contains a
signal. If the signal originates in the DMS-D, its location is in parentheses following the description.
separate (male) pin for the return side, which is isolated from chassis ground and terminated at the main analog ground buss.
(d) The outputs of selectors A, B, and C are available for test and measurement through three front panel jacks;
J12, J13, and J15 respectively.
b.
Power.
(5) Comparator threshold. To ensure reliable triggering and operation of the CT, a conditioning circuit is
(1)
Battery charger/radiometer.
available that consists of two voltage comparators and a voltage reference that is adjustable for each comparator.
(a) When used with the 1Wll cable, J9 connector permits charging of up to four TTS or MTS battery
(a) The two comparators have been labeled B and C for the reason that one comparator always receives its
packs. Each of the four charging lines contains a current-limiting 35.7 ohm resistor, making the peak charging current for a
signal input from selector B, and the other from selector C. A reference voltage, against which the corresponding signal is
typical 7V discharged pack approximately 490 ma. During periods of battery charging, the DMS switch should be set to the
compared, is established by the comparator threshold B and C potentiometers. This voltage is variable over a range of
off position. This effectively removes power from the DMS-D electronics, while still providing charging current through J9.
approximately -9.5 Vdc to +9.5 Vdc.
(b)
+13 Vdc power for the radiometer is also supplied through J9 when the 1W6 cable is connected.
(b) When the selected signal level passes through the threshold level of the comparator, a positive or negative
spike is generated, depending on the direction in which the signal is changing. In general a negative-going signal will
produce a negative spike, and a positive-going signal will produce a positive spike, as depicted below.
(2)
Power switches.
(a) Main power circuit breaker CB1 controls the AC power to the CT and the primary power supply.
Nominal rating of the circuit breaker is 5.0 amps.
(b) DMS switch S7 must be in the on position for normal operation of the DMS-D. Setting the switch to
the off position interrupts +5 Vdc, +13 Vdc, -13 Vdc, and -25 Vdc routing to the distribution busses, thereby conserving power
and extending component life during battery charging.
(c)
Power input connector J4 mates with cable 10219812 to supply 115.0 11.5 VAC, 57 to 420 Hz to the
DMS-D.
(3)
Power supplies/regulators.
(a) The source of power for the DMS-D electronics is a multioutput power supply, mounted in the DMS-D
case and connected to the panel through J29. +5 Vdc, 13 Vdc, and 25 Vdc are routed to the various terminal strips
mounted beneath the card file for use by the electronics boards, dc-ac inverter, and regulators.
(b)
Power for the DMM is supplied by a 50VA dc-ac inverter, which converts
3-4
