TM 55-4920-399-13&P
CHAPTER 1
INTRODUCTION
Section I. GENERAL INFORMATION
c. Simulate the compensator by introduction of
1-1. General. This technical manual describes
appropriate capacitance.
operation and maintenance instructions for the
F u e l Quantity Gage Test Set, Part Number
472090-002, (Refer to Fig. l-l), designed and
and cabling.
manufactured by Simmonds Precision, Instrument
Systems Division, Vergennes, VT 05491.
1-3. Maintenance F o r m s a n d R e c o r d s .
Maintenance forms, records, and reports which are
1-2. Scope. The purpose of the Fuel Quantity Gage
t o be used by maintenance personnel at all
Test Set is fourfold, as follows:
maintenanc levels are listed in and prescribed by
DA Pam 738-751.
1-3A. Destruction of Army Materiel to Prevent
gage circuits.
Enemy Use. Procedures for destroying Army
b. Calibrate a fuel gage circuit by introduction
materiel to prevent enemy use are listed in TM
of appropriate capacitances.
750-244-1-4.
Section II. DESCRIPTION AND LEADING PARTICULARS
d. LOZ - LOZ COMP
1-4. Operational Description. This description
gives an account of the switches and controls on
e. LOZ - Hi Z
the front panel by function (Refer to Fig. 1-2).
f. LOZ COMP - Hi Z
g. E X T
1-5. Mode Select. This switch (1) controls the func-
tions of the Test Set.
1-7. T/U - COMP. This switch (12) selects the
a. OFF(2): Power to Test Set is off.
TANK UNIT (13) or COMPENSATOR (14) for ex-
b. MEAS EXT (3): M e a s u r e s e x t e r n a l
ternal measurement (3) or for internal measure-
capacitance through jacks labeled, TO PROBES
ment (8).
(4).
These
thumbwheel
1-8.
X1000pf/X100pf.
c. SIM (5): Switches power off and switches
switches (15) in the SIMULATOR (6) section select
pre-selected value of capacitance in SIMULATOR
values of capacitance to be simulated, in hundred-
(6) section to jacks labeled, TO IND (7) (indicator).
ths or thousandths of picofarads.
d. MEAS INT (8): S w i t c h e s c a p a c i t a n c e
measuring section to read SIMULATOR (6) sec-
1-9. 100pf IN/OUT. This switch (16) is used if
tion, which can then be set to the desired value.
100pf is to be added to compensator simulator
value.
circuit.
1-10. Tank Unit Simulator Set. This vernier ad-
justment (17) provides a fine adjustment for values
tions when MODE SELECT (1) is placed in MEG
selected in tank unit simulator. Two ratios are
(9) position. It is used to select one of seven points
available: normally 40:1, 1:1 if knob is pushed in.
b e t w e e n which leakage resistance is to be
measured.
1-11. Compensator Simulator Set. This vernier ad-
justment (18) is similar to (17) and provides a fine
8. LOZ - GND
adjustment for values in compensator simulation.
b. LO Z COMP - GND
Two ratios are also available.
c. Hi Z - GND
Change 1
1-1
