Chapter 3 — Measuring with the DWR-10
Page 42
September 2004
After the current has stabilized, wait for the resistance
readings to stabilize. Observe the stability indicators on
the screen.
•
When readings begin or if they remain unstable, the
indicator is gray.
•
When 10 consecutive readings have stabilized
between a 1% and 0.25% rate of change, the indicator
turns to yellow.
•
When 10 consecutive readings stabilize to a rate of
change of 0.25% or less, the indicator turns green.
Some discretion is required to determine when the
readings become stable. When the stability indicator is
green, the readings may be completely stable. However,
with large transformers, the last digits of the reading may
continue to drift lower for a few more seconds or minutes.
Testing in Timed Mode
The
Timed
mode (on the 'T' version of the DWR-10)
allows you to record readings at set intervals (or
manually), with the time of measurement saved along
with each measurement. This mode is normally used by
transformer manufacturers to record several time-stamped
resistance measurements in order to plot a curve of
resistance versus time.
To test in
Timed
mode:
1. Press
the
Menu
button and select
Timed mode
. The
Interval Time
window displays.
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