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VIT
Voltage / Current Sensor
Accurate high frequency measurements of
high voltages and currents are difficult. The limited input range of instrumentation,
such as A/D converters, is often incompatible with a wide dynamic range.
Driving balanced or floating loads complicates the issue further. It is very
important to sense both voltage and current at the same point in order to get
accurate phase information. Our VIT is inserted between the output of the
power amplifier and the load.
This instrument is electrically
equivalent to a wide band potential transformer and a shielded current
transformer. It can tolerate 1000 V of common mode voltage up to 200 kHz,
while maintaining the specified accuracies of magnitude and phase.
The outputs of the voltage and current
channels are single ended and have a 50 ohm source resistance. These analog
monitor voltages have the same waveform as the voltage and current under
test. Their magnitudes are accurately proportional to the original
magnitudes, and the phase shifts between the voltage and current channels are
matched. Phase information will remain valid if the low level output cables
are matched in length, termination, and characteristics. These monitor
signals are available at an MS type connector on the rear, as well as at BNCs
on the front panel.
VIT-10M-6
This is a single range version which uses
differential voltage sense and average current sense. It produces a buffered,
single ended low level output of 1 mV/V and 100 mV/A. All other specs are the
same as the VIT-13. The unit is normally sold with 6 channels in the 3U (5.25
inch) high rack mounting package.
Pricing for 3,4,5,or 6 channels is available.
VIT-13
This instrument has four levels of
sensitivity of voltage and current which may be selected locally or via
isolated TTL logic. In addition, it has a current transformer in both the
high and low leg which may be selected by a front panel switch.

Specifications
for VIT-13
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Voltage Sensitivity
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100 uV/V, 1 mV/V, 10
mV/V, 100 mV/V
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Current Sensitivity
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10 mV/A, 100 mV/A, 1
V/A, 10 V/A
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VIT-14
only
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100 V/A
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Maximum input
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5 kV RMS, 10 kV peak,
30 A RMS, 100 A peak
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Maximum output
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10 V peak (7 V RMS
for sine waves) 100 mA
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Output impedance
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50 ohms
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Accuracy:
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100 Hz-50 kHz
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1% of reading + 0.1% of
full scale 1 deg of phase
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40 Hz-200 kHz
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2% of reading + 0.2%
of full scale 2 deg of phase
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10 Hz-500 kHz
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5% of reading + 0.2%
of full scale 5 deg of phase
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Common mode
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34 dB from 100 Hz to
100 kHz
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rejection
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24 dB from 10 Hz to
200 kHz
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Primary Power
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120/240 V 50/60 Hz 1
ph
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Size (inches)
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5.25 high Rack
Mounting
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Weight (pounds)
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18
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Photograph
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VIT-10M-6
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VIT-13
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