TM 11-6625-2631-14
FUNCTIONING OF EQUIPMENT
p r e v e n t s voltages of less than 9.1 volts (ap-
5 - 1 . General
p r o x i m a t e l y ) from causing a meter deflection;
therefore, the m meter zero point corresponds to this
act, showing the test connectors, circuit board, arid
voltage and an expanded meter scale is provided
test meter, M1, all of which comprise the battery
which offers greater resolution in the more critical
test circuit. A schematic diagram of the test set is
area of battery voltage (9.1 to 15.7 volts dc).
given in figure 5-2.
b. Batteries used in Radio Sets AN/ URT-21,
A N / PRC-63, AN/ URT-27, and AN/ PRC-90
a. The batteries used with the ACR / RT-10
are also tested by an incremental voltmeter circuit,
(K308, K308A) and AN / URC-10 radio sets are
R 4 , R5, R6, and Zener diode CR2. Zener diode
t e s t e d by an incremental voltmeter circuit. This
CR 2 establishes the meter zero point at 3.8 volts
circuit utilizes only a portion of the total battery
(approximately) so that the expanded meter scale
voltage, as determined by the rating (breakdown)
reads between 3.8 and 13.5 volts dc.
o f Zener diode CR 1. The battery under test is
c. Battery type SDU-5 / E is tested through a
loaded down by battery load resistor R 1 and the
s e p a r a t e connector, battery load R 7, and meter
b a t t e r y output voltage is connected across the
m u l t i p l i e r R8, which, w i t h M 1, form a basic
Zener diode circuit R2, R3, CR 1. The Zener diode
voltmeter circuit.
