Chapter 1 — Introduction
Page 2
to a value between 10-100 Amps and is maintained
for a preset time period between 10-60 seconds.
•
A 20-Amp continuous mode is also provided to aid in
trouble shooting by allowing the operator to move
and relocate the potential leads during testing.
•
The DRM-100 instrument is specifically designed for
rough usage and to function reliably in energized
EHV substations where high electrical and magnetic
fields are frequently present.
•
The DRM-100 instrument was also designed to
function accurately and reliably with up to 1000
VAC of noise present on the device under test - a
common condition in energized transformer stations.
•
Test results are displayed in extra large font on the
bright color LCD screen.
•
Membrane switch buttons surround the screen for
setting the test current, test time and for initiating the
test.
•
The DRM-100 uses the 4-terminal method of
resistance measurement to eliminate the effects of
lead resistance.