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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-10

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.

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.

VIT-14

The VIT-14 is like the VIT-13 with one additional current range of 100 V/A for very low currents.

Specifications for VIT-13

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



Typical Amplitude Accuracy vs. Frequency

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Specifications and prices subject to change without notice.


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