Figure 5-7. Fabrication Diagram for Fillercap Vent Valve Tester.

TM 11-6140-203-14-4&P

water. Otherwise measurements can only be made at

5-13.

Battery Heater Blanket Assembly Electrical

the battery blanket terminal board by removing the

Test

insulating materials. The following heater resistance

The battery heater electrical test consists of 2 parts.

valves for the various manufacturers is provided.

One part is conducted at temperatures above 50 :5° F

(1) General Electric heater blanket.

and the other is conducted at low temperature.

(a) Resistance 4.4 to 4.8 ohms.

a Thermostats. The BB-693A/U battery is

(b) Power consumption: 175 t9 watts at

equipped with two series connected normally closed

W volts dc.

thermostats that open at temperatures above 50 ±5° F

(2) Marathon heater blankets.

(13 :3° C).

At normal ambients resistance

(a) Resistance:

measurements taken with a multimeter across pins A

1. Center element: 3.5-3.6 ohms.

and B and C and B of the connector J3 should read very

2. Outer element: 8.0-8.1 ohms.

high valves indicating that both thermostats are open.

3. Combined: 2.4-2.5 ohms.

b. Heating Elements.

''The resistance of the

(b) Power consumption: 350 watts at 29

various heating elements can only be measured through

volts dc.

connector J3 if the battery temperature is under 450 F

(3) SAFT heater blankets.

(9° C). This temperature can be obtained by filling the

(a) Resistance: 1. Bottom element:

empty

case

(no

cells)

with

ice

8.4-9.3 ohms.

5-19