ATS Handheld Inductive Loop Tester HILT 9000 - Manual (Page 13)

12
www.atsi-tester.com
Commonly Asked Questions
Q. Why do I have to disconnect the detector from the loop before
running a Loop,
Q, or ∆∆∆∆∆
L test?
A. During Loop,
Q, and ∆
L test, the tester is applying its own
signal to the loop. The tester verifies there is no signal on the
loop before running these tests. However, with a scanning
detector connected to the loop, there are time intervals during
which the loop does not have a signal applied. If the verification
occurs during that time interval, the HILT will not “see” that
there is another source of voltage connected to the loop and will
begin the actual test. Presence of another voltage on the loop will
result with incorrect measurements or potentially damage the
tester.
Q. When I run a Q test, why are there two results shown?
A. The quality factor
Q depends not only on the parameters of
the loop but also the frequency of the measuring signal. During
a
Q test, the tester measures Q at a natural resonant frequency,
which depends not only on the parameters of the loop but also
those of the tester and it will not be the same as the user-
selected frequency. The
Q measurement for the natural resonant
frequency is displayed on the first line. The
Q for the user-
selected frequency is calculated and is displayed on the second
line.
Q. Is an adapter available to plug into the detector rack that will
allow testing from the detector’s connection points?
A. Yes. Call your distributor or the factory for pricing and
availability.