7
HILT 9000 - Inductive Loop Tester
,
,
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
Figure 5. Use the
!
or
"
push-button to
increase or decrease the frequency by
1KHz. Pressing and holding
!
or
"
button will automatically increase/
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.
Test @ frequency
F=50 KHz
Figure 5
dL/L= 0.127%
max= 3.378%
Figure 6
