9
500-17700, Rev D
NOTE 1:
Securitron has developed a simple filter circuit which will
absorb the interference from the reader. This requires a
22 millihenry (mH) inductor (DigiKey Part # M7223-ND, JW
Miller Part # 70F222AI). This part can also be purchased
at a local electronics parts supply house or directly from
Securitron.
NOTE 2:
Because the inductor is an insulated part, it can lay in the
cavity in the plastic base on top of the circuit board.
c. INSTALL the inductor by identifying the ring terminal with brown
wire, which connects the “antenna” screw on the back side of the
aluminum handle to the circuit board, clipping this wire, and
splicing in the inductor.
3. ADJUST the sensitivity.
NOTE 1:
The sensor board has a potentiometer which is accessible
through a “pot access hole” from the top of the aluminum
handle before the plaque has been installed (see
Figure 2). The potentiometer increases sensitivity when
turned clockwise and decreases it when turned
counterclockwise. An LED on the sensor circuit board,
also visible through an access hole in the aluminum
handle (see Figure 2), “follows” the sensor. It is on when
the sensor is releasing the door.
NOTE 2:
In the following step, sensitivity is so high that the unit is
on all of the time.
a. ROTATE the potentiometer (POT) clockwise, without touching
the TSH, until the LED just turns on.
b. ROTATE the POT slowly counterclockwise until the LED turns
off, and then another 15 degrees counterclockwise.
c. EXPERIMENT by touching the handle and observing if the LED
comes on.
d. ADJUST the POT, as required.
