MIL-PRF-83323C
3.6.10 Electrical Box and Electrical Interface System. The electrical system shall be in accordance with the
electrical schematic contained in Figure 2. The top of the electrical box shall display the indicator lights, power
switch, charge light and voltmeter. The side of the electrical box shall be equipped with connectors to mate with
an induction coil, the AC power cord, and headset Type H-157/AIC, in accordance with MIL-DTL-83511/2.
Oscilloscope connections via two tip jacks, shall also be located on the side. The electrical box shall be
environmentally sealed, and seals and gaskets shall be fuel-resistant. The parts external to the box shall be
resistant to fuel spray.
3.6.11 Induction Coil. The induction coil shall be compatible with the MIL-R-27521 receptacle induction coil
and designed and located in accordance with MS27604. The pole faces shall be protected from corrosion with one
coat of clear urethane. Coil installation or replacement shall not require potting or special tools and shall be
accomplished in a minimum of time.
3.6.12 Signal Receiving. The tester induction coil shall receive a positive transient voltage pulse of not less than
7.5V, nor more than 30V, when the tester nozzle is in the seated position and the receptacle induction coil receives
an 18V to 30V pulse.
3.6.13 Signal Sending. The tester induction coil shall induce a positive transient voltage of not less than 7.5V
and not more than 30V when the tester nozzle is in the seated position and the tester coil receives an 18 to 30V
pulse by activation of the signal switch.
3.6.14 Induction Coil Terminal Identification. The polarity of the induction coil terminals shall be clearly and
permanently identified by stamping, engraving, or with a securely attached nameplate, with engraving being
preferable.
3.6.15 Voltmeter and Voltmeter Switch. The voltmeter shall meet the requirements of MIL-PRF-10304/32, and
full scale shall read 30V with 2V divisions. The voltmeter shall measure the voltage supplied by the power pack
to the circuits of the electrical box. A control to switch the voltage from 18-19V to 29-30V shall be provided
adjacent to the voltmeter, and so designated on the face of the electrical box. The control shall be in accordance
with MIL-DTL-8834 (MS90310-231).
3.6.16 Indicator Lights. Three indicator lights in accordance with MIL-L-3661/35 and MIL-DTL-3661/47 shall be
provided. The lights shall be positioned, color coded, and labeled from left to right on the tester electrical box in the
following order:
Blue - READY
Green - CONTACT MADE
Amber - DISCONNECT
The lights shall incorporate transparent lenses color coded as above. See figure 2 for electrical interface with the
tester.
3.6.17 Intercommunication Switch. A switch shall be provided which shall permit the tester operator to
converse with personnel inside the aircraft using the aircraft intercommunication system. It shall be labeled
"TALK".
3.6.18 Signal Switch. A signal (test) switch shall be provided which shall permit advancing the signal amplifier
from READY to CONTACT (test) to disconnect in single-step functions by applying power to pin 6. The switch
shall be a double-throw, single-pole switch spring loaded to a neutral position. The two positions shall be
designated CONTACT (TEST) and DISCONNECT.
3.6.19 Signal Amplifier. The tester shall incorporate a P/N MS 38449-4 signal amplifier (or the equivalent
thereof) selected from the Qualified Products List (QPL) of MIL-S-38449. The plug, if used, which connects the
tester electrical circuits to the signal amplifier s electrical receptacle shall be in accordance with SAE-AS50151. The
signal amplifier, or the equivalent there-of, shall be contained within the electrical box of the tester.
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