ATS Handheld Inductive Loop Tester HILT 9000 - Manual (Page 4)

3
HILT 9000 - Inductive Loop Tester
General Description
The HILT -9000 is designed to measure characteristics of an
inductive loop at different frequencies; measure working
parameters of the loop system; as well as simulate the detector
by measuring the change of inductance. The measurement
modes can be easily switched by pressing corresponding buttons
on the keypad.
The following tests can be run to verify the condition of the loop:
• R, L, and
Q of the loop
• Operating parameters of the loop system: operating mode,
frequency (f
OP
), and peak-to-peak voltage (V
PP
)
• Change of inductance of the loop (
∆
L/L)
Where,
Q = quality factor (dimensionless)
L = inductance (
µ
H)
R
DC
= DC resistance (
Ω
)
f
OP
= operating frequency (KHz)
V
PP
= peak-to-peak voltage (V)
The tester offers a user-selectable frequency at which
Q and L
are measured. At power-up, the frequency is pre-set to 50KHz
and can be easily changed from 20KHz to 80KHz range using the
keypad.
An inductance change
(∆
L/L) can be measured to assess the real
life behavior of the loop. In this mode the tester displays the
current value of the inductance change and the maximum
observed change which can be reset by pressing a button on the
keypad.
When the loop is connected to a detector, the tester can measure
the oscillating frequency and peak-to-peak voltage of the signal.
In addition, the tester detects the operating mode and indicates if
it is a continuous (single channel) or scanning (for most multi-
channel detectors).
The tester has a 16 by 2-character LCD for presenting the
measured values to the user. The control keypad has 7 command
buttons and one Power On/Off button. The tester requires two
standard 9V alkaline batteries. To extend the life of the batteries,
the tester shuts off automatically after 30 seconds of non-use.