ACR&Artex ME406 HM - Manual (Page 38)

ARTEX PRODUCTS / ACR ELECTRONICS, INC
DESCRIPTION, OPERATION, INSTALLATION AND MAINTENANCE MANUAL
ME406 (453-6603), ME406HM (453-6604)
25-62-30
Page 38 of 84
Jun 25/13
SUBTASK 25-62-30-750-008
M. Current Draw Test – Item 5f
CAUTION: EXERCISE EXTREME CAUTION TO AVOID CAUSING A SHORT CIRCUIT CONDITION,
WHICH WILL BLOW THE FUSES IN THE BATTERY PACK. THIS TEST SHOULD ONLY BE
PERFORMED BY AN EXPERIENCED TECHNICIAN/MECHANIC.
CAUTION: ALL “ON” STATE CURRENT MEASUREMENTS MUST BE MADE WITH THE RF OUTPUT
(I.E., ELT ANTENNA CONNECTOR) LOADED WITH 50 OHMS RATED FOR 5 WATTS.
EITHER A RESISTIVE LOAD OR EQUIPMENT WITH 50 OHM IMPEDANCE PADDED WITH
A 10 DB/5 WATT ATTENUATOR. REFER TO SUBTASK 25-62-30-750-002 ON PAGE 35.
CAUTION: ACR ELECTRONICS DOES NOT RECOMMEND MEASURING THE 406 MHZ BURST,
WHICH DRAWS UP TO 5 AMPS OF CURRENT; HOWEVER, THE AMMETER USED TO
MEASURE THE STEADY STATE CURRENT OF THE 121.5 MHZ TRANSMISSION MUST BE
CAPABLE OF WITHSTANDING A 5 AMP CURRENT DRAW OR MUST HAVE THE READING
SCALE ADJUSTED ACCORDINGLY. KEEP IN MIND THE ELT TRANSMITS A 406 MHZ
BURST WHEN THE ELT IS RESET, IN ADDITION TO A 406 MHZ BURST
APPROXIMATELY EVERY 50 SECONDS.
(1) Verify the ELT control switch is in the “ARM” position.
Separate the battery pack from the ELT. See SUBTASK 25-62-30-050-001 on page 46
(2) Install test fixture 500-0057 in the power circuit. See Figure 9 Current Draw Test Setup.
Figure 9 Current Draw Test Setup
(3) Connect the ammeter and set it for the lowest possible scale.
(4) Read the current draw on the ammeter. Measured current must be £ 2 µA (micro-amps).
TEST FIXTURE
500-0057
CONNECT ELT FLEX
CABLE HERE
CONNECT TEST FIXTURE
TO BATTERY PACK PLUG
+
A
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