|8789 William Cody Drive
Evergreen, CO 80439
50, 900 & 2000
Proximity Switch Tester
The F900PST-3200 proximity switch tester is designed utilizing information from the proximity switch manufacturer's specifications and its purpose is to test proximity switches only. This unit is powered by 9V internal batteries (24V min. recommended) and/or external 24-28V power supply.
Note: Attempting to connect this unit to the aircraft
system wiring may cause damage to aircraft electrical components.
1. Select appropriate 3 or 6 pin connector on Tester Box and
connect directly to the Proximity Switch pigtail or connector in
attempt to connect proximity test box pigtails to the aircraft side of
the proximity switch circuit-
2. Move three position selector to the appropriate position,
3 pin or 6 pin depending on pins to be checked (Reference aircraft
wiring manual for 6 pin connectors).
3. Turn test box On-Off switch to "On". Actuate "Push-to
Test" switch and check that green light illuminates. A change in the
brightness of the green light indicates an improper ground on the
proximity switch. This can be used to verify that the output signal
from the proximity switch has a proper ground.
To actuate the proximity switch place a metallic washer flat
against the surface to determine if the proximity switch state changes,
such as open signal to ground signal, which will light the green light.
If the proximity switch is a normally closed type, the switch should
change from a green light to an unlit green light when the metallic
object is held flat on the proximity switch sensing surface.
Reference items 1-10 below for information on test
1. GREEN LIGHT lights up when proximity switch under test
has a ground on its signal output wire.
4. GROUND TEST POINT. Enables meter or scope monitoring connection to the common ground point.
5. SIGNAL TEST POINT. Provides for monitoring of proximity switch ground signal output (voltage present when green light not lit, grounded when lit).
6. POWER SUPPLY MONITORING POINT. Voltage will be present from internal 27 VDC batteries or auxiliary power (see #9-10) with ON/OFF switch (see #7) in ON position.
7. ON/OFF SWITCH. The ON position routes battery or auxiliary power (see #9-10) to the power supply monitoring point (see #6). The ON/OFF switch provides power to the red and green light for testing of the proximity switches. Turn tester OFF whenever test box is not being used.
8. RED LIGHT ON LAMP. Lights when voltage is present at item #6. The red light dims when the three internal nine VDC alkaline batteries are exhausted. To test batteries, turn ON, note red light, press test switch.
9. AUXILIARY POWER POSITIVE CONNECTION POINT. External connectors are provided to power the box in the event the the internal batteries have inadequate voltage.
10. AUXILIARY POWER NEGATIVE CONNECTION POINT. For a full circuit outside power supply, there is an auxiliary positive connection.
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Hart Aviation Consulting, Inc.