Atec ESI-DT72A - Manual

Model DT72A is an inductive voltage
divider that meets or exceeds all of the
requirements for a calibration standard in
precision measurement applications. It is
easy to integrate into systems for
calibration of voltage dividers,
transformer standards, synchro/resolver
standards, transformers, calibrators,
ammeters, and voltmeters. It can also be
used to make impedance or capacitance
comparisons. The ratio accuracy is
traceable to the National Institute of
Standards and Technology.
This variable AC voltage divider
demonstrates extreme precision for
measuring and generating voltage ratios.
Seven decades of tapped transformer
windings are selected using special low
resistance switches providing 0.1 ppm
resolution and 0.9 ppm terminal linearity.
The key to these standards is extremely
stable toroidal transformers, resulting in
precision and outstanding long-term
stability over a wide range of
environmental conditions. The seven in-
line control knobs permit quick, easy
setting of the required ratios. The first dial
has end stops to prevent accidental
switching from zero to full output. The
other dials rotate independently through
360° of rotation to simplify the settings.
The switch settings are easily read from
the large-numeral in-line presentation
above the knobs.
Switching transients are virtually
eliminated due to a special circuit which
couples the adjacent voltage steps through
a resistor while the switching is taking
place. The range overlap between decades
is ±10%, permitting accurate voltage
ratios from 1.1 to -0.1.
The high input impedance of the
DT72A makes it well suited for use in high
impedance circuits without causing
excessive loading.
Decade Ratio Transformer Standard
•Resolution 0.1 ppm
•Terminal linearity 0.9 ppm
•Bandwidth 50 Hz to 10 kHz
•Parallel switches reduce
contact resistance
•Switch Resistors virtually
eliminate switch transients
•Ratio range from -0.0111111
to +1.1111110
A C S T A N D A R D S A N D M E A S U R E M E N T I N S T R U M E N T S
Model DT72A
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