User Manual

The PeakTech
®
1125 has 5 measuring ranges, from 200.0 milli-
ohm to 2000 ohms.
Measurements are displayed on a 3 ½ digit custom liquid crystal
display with large digits.
This instrument is powered from the mains. It has a regulated
DC constant current source with current of 1 mA, 10 mA and 100
mA. The instrument supplies that current to the resistance being
measured though the C
1
and C
2
terminals (C
1
being +,
C
2
being -).
The voltage drop across the resistance under test is measured
by the potential terminals P
1
and P
2
(P
1
being +, P
2
being -).
Should the current regulation drops out, the R
C
LED will lit,
indicating, that the resistance in the current circuit is too high.
(Lowering the current by selecting a higher resistance range can
solve the regulation).
Should the R
P
LED lit, that means, that the voltage measured on
the resistance is too high, and therefore over-range. The
resistance is measured precisely, when the R
P
and R
C
LED´s do
not lit. If anyone of these LED´s lit, then the measurement can
be inaccurate.
The PeakTech
®
1125´s LC-Display can be viewed in most
lightning conditions. This display indicated the different
conditions (Hold, buzzer, polarity condition of load, + or -. The
ranges are selected by a rotary switch, and a test is initiated by
pressing the ON push-button. The instrument takes
measurements for 10 seconds if the “ON” “TEST R
P
” button is
depressed for less than 2 seconds.
If the same button is pressed for more than 3 seconds, the test
will carry on for 60 seconds. The auto-off is 5 minutes.
-19-