The DTR-3k has been specially designed to determine
the Tan Delta, Dielectric Constant, and Resistivity of Transformer
Oil and other electrical insulating liquids using a guarded
three terminal test cell. The test set may also be used for
the measurement of the above parameters with a solid insulating
material, using the solids dielectric test cell (STC).
There are built-in safety features which include; zero voltage
start, auto-trip with LED indication if the system is not
grounded, auto-trip with LED indication if the safety interlock
is opened, and a built-in protection circuit if the test sample
should flash over.
The ε-DF portion of the
instrument operates as a manually balanced capacitance bridge.
Since ε is a ratio of
the full cell capacitance to the empty cell capacitance, the
empty cell capacitance (in cm) must be dialed in or be balanced
out by using the balancing procedure. The cell constant (in
cm) equals 3.6 x 1 x C, where C is the cell capacitance in
pF. The bridge balance is accomplished with the aid of synchronous
and phase sensitive null detector which allows easy and independent
balancing of the ε and DF components.
The Resistivity meter is auto-ranging with the reading displayed
on a 3 1/2 digit DPM. Once the cell capacitance is balanced
with the cm dial, the Resistivity meter reads volume Resistivity
directly in ohm-centimeters. With the cm dial is set to 1000,
the Resistivity meter reads resistance in ohms multiplied
by a factor of 1000. The auto-ranging feature eliminates the
need for manually selecting the right range.
• Direct digital display of test voltages
• Cell constant adjustment and Tan Delta zero correction
• Zero start on AC voltage for safety
• Gain control for detector electronics
• Unit is 19 in. rack mountable or can be used as a table
top system
• 1-year warranty
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