levr
LIM-05 user manual
Dated 25/5/2017
http://www.levr.pl/
Page
12
of
20
1 - Długo
ś
ć
p
ę
tli> (Loop length>)
2 – Napi
ę
cie progowe U
p
= (Voltage threshold Up =)
3 – Liczba kanałów = (Number of channels =)
4 – Przebieg odniesienia (Reference run)
5 – Czas martwy = (Dead time =)
6 - VOP =
7 - Parametry impulsu> (Pulse parameters>)
8 - Zakres pomiarowy U
zak
= (Measuring range U
zak
=)
9 – Wy
ś
wietlenie nastaw (Display settings)
0 - Kod PIN (PIN code)
6.1 “Długo
ść
p
ę
tli >” (Loop length>) entry
Contents of the discussed entry are presented below.
1 – Długo
ś
c p
ę
tli>
1 – Mi
ę
dzy kursorami= (Between cursors=)
2 – Zakres= (Range=)
3 - Autokalibracja (Self-calibration)
T
i
=50ns
▼
▲
U
i
=…mV
▼
▲
During measurements, the measuring range should be adjusted to the measured value.
In the LIM-05 locator, the measuring range is determined so as to ensure that it most
accurately corresponds to the length of the measured sensor wire. The x axis represents
the measuring range and, at the same time, the length of the alarm wire. The beginning
of the x axis has an assigned value x = 0 m, and the length at the end of the axis (end
of the measuring range) should be equal to the length of the monitored sensor wire.
The presented method of calibration of the x axis enables obtaining the highest
possible measuring resolution. The calibration method also ensures that the image
corresponds to reality. For instance, if a fault occurs near the end of the network, it will
be represented near the end of the x axis and not, for instance, in the centre of the axis.
Instrument calibration relating to determination of the length measuring range is done
in two ways after entering the “Długo
ść
p
ę
tli>” (Loop length>) option. The names and
description of each of these options are specified below.
METHOD 1
3 - Autokalibracja (Self-calibration)
Before initiating the procedure, make or break the end of the alarm system. For
instance, remove the port plug from the box at the end of the sensor wire (breaking).
Next, set the duration T
i
and amplitude U
i
of the measurement pulse. After you
complete these actions, press the (3) key and wait (in older versions of the locator, this
can take up to several minutes), until the instrument “locates” the end of the sensor
wire on its own. Once the procedure is complete, the screen of the LIM-05 instrument
will display the echo voltage function for the entire sensor wire. If necessary, adjust
the position of the K2 cursor so that it is located at the beginning of the measurement
pulse reflected from the end of the sensor wire. Next, eliminate the make/break at the
end of the line, enter option 1-Mi
ę
dzy kursorami= (1 – Between cursors =) in the
Kalibracja / Długo
ść
P
ę
tli (Calibration / Loop length) menu and enter the known,
accurate length of the sensor wire.
