TM 11-6140-203-14-4&P
Figure 5-7. Fabrication Diagram for Fillercap Vent Valve Tester.
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
