Chapter 5: FUNCTIONING OF EQUIPMENT

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;

Figure 5-1 is a functional block diagram of the test

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).

b. Batteries used in Radio Sets AN/ URT-21,

5-2. Functional Description

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.

Figure 5-1. Test Set. Battery TS-2530 / UR. functional block diagram.