ATS HILT 9000 manual Set Frequency, Change of Inductance

	HILT 9000 - Inductive Loop Tester		7
,	,	Set Frequency

When the tester is powered, the test frequency is automatically set to 50 KHz. The frequency can be changed to any value between 20 KHz and 80 KHz with 1 KHz resolution. To set a

different frequency press the SET
FREQ push-button to view the fre-
quency adjustment display as show in	Test @ frequency
Figure 5. Use the ! or " push-button to	F=50 KHz
increase or decrease the frequency by
1KHz. Pressing and holding ! or "
button will automatically increase/	Figure 5
decrease the value.

Change of Inductance

ATTENTION

•Disconnect the detector from the loop before running this test.

•Prior to measuring the operating parameters of the loop system, press the DETECTOR push-button and verify the tester displays the “No Signal” message. Once this message is received the detector can be reconnected to the loop.

In this mode, the tester simulates a detector by measuring a relative change of the inductance and displaying the results.

Connect the test leads to the loop and press ∆ L button on the keypad. The display will appear as shown in Figure

6.The top line indicates the current change of the inductance and the bottom line indicates the maximum

recorded change of inductance. To reset the maximum value press the ∆ L button.

dL/L= 0.127% max= 3.378%

Figure 6