TM9-4935-481-14-1
C2
the DMM L0 switch is in the SEL B position. Selector C selects the test parameter which is to be applied to counter signal
(2) Fault isolation to a plug-in-unit or replaceable subassembly.
conditioner C and to connector J15. The output of J15 may be applied to the CT or to external test equipment using the
appropriate cables.
(3) Operational retest after repair or adjustment to verify that performance is within specified limits required for
return to service.
4. Comparator threshold controls B and C are so labeled because of their relationship to selector switches B and C. They
are used as counter signal conditioners, making it possible to make accurate time measurement of low voltage level signals.
The comparator outputs are a positive or negative pulse generated as the respective input goes through a specific voltage
c. Function of Each Major Unit of DMS-D. The function of each major unit of the DMS-D is as follows:
level in a positive or negative direction. This voltage level is adjustable using the comparator threshold B and C adjustments.
(1) The test set (fig. 1-1), may be divided into four major sections for functional description. These sections are the
5. Connectors J5, J6, J7 and J8 provide interconnection of the DMS-D test set stimuli and monitor functions to the
monitor/control, trainer, tracker, and tracker test set. Three subsections, not directly related to the major sections, are also
external test equipment, the DMS-G test kit, and the UUT as determined by the specific test in progress.
described. These are the internal test, peak detector, and counter inhibit(sec).
6. The battery charger/radiometer connector J9 supplies 24 Vdc at up to 600 ma for charging batteries used in the TTS
(a) The monitor control section contains circuits, controls, and indicating devices which are used in
and MTS. It also supplies power to the radiometer.
conjunction with all other sections.
7. Detector simulator A connector J10 and detector simulator B connector J11 provide simulated tracker IR detector
1. Power is applied to the DMS-D test set by connecting a 103.5-126.5Vac power source to the 115Vac, 57-420 Hz power
outputs for fault isolation of the DRAGON tracker, and tests of the CSCB.
input connector J4, positioning the main power circuit breaker to the ON position, and positioning the DMS power switch to the
ON position. Power from bat-chg/radiometer connector J9 is available any time the main power switch is ON. The DMS
power switch may be set to the OFF position during battery charging operations to remove power from the DMS-D test set
(b) The trainer section of the DMS-D is used for performance testing and fault isolation of the MTS. The stimuli
electronics so the equipment will not be subjected to unnecessary operation.
applied to the MTS by the DMS-D are the vertical and horizontal rate/positions signals, sum signal, trigger, and first motion
signal.
2. The indicating devices are a power indicating lamp, test status lamps, digital multimeter (DMM), and an electronic
counter-timer (CT). Inputs to the DMM may be applied through external jack J17, or through internal circuitry by properly
1. Momentarily closing the test start switch applies the trigger and first motion signal to the UUT. This also enables the
positioning the DMM input switch. The DMM return circuit may be selected by positioning the DMM LO switch. The DMM
test set master clock. The test set produces one 14 second trainer test cycle.
mode of operation is selected by positioning the DMM function switch. Operation of the DMM is described in TM 9-4935-548-
14. Inputs to the CT are applied from DMS-D external connectors to the CT A and B input connectors. Operation of the CT is
described in the commercial manual, Monsanto Company Counter-Timer Model 100C/101C.
2. The mode switch selects the UUT test parameters to be measured. These are the function curves, filter outputs, error
comparator signals, and error after divide signals.
3. The function of the monitor selector circuits is to apply stimuli to, and monitor outputs from, the DMS and UUT circuits
and indicators. Selector A selects the test parameter which is to be applied to the DMM and to connector J12. The output of
3. Error amplitude control adjusts the polarity and amplitude of the simulated error signals.
connector J12 is applied to external test equipment. Selector B selects the test parameter to be applied to counter signal
conditioner B and to connector J13. The output of J13 may be applied to the CT or to external test equipment using the
4. Transmitter lamp switch determines the level of the sum signal applied to the UUT transmitter acquisition circuit.
appropriate cables. Selector B supplies the DMM return when
5. The status go, no/go lamps indicate the status of various functions
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