Tuned Voltmeter TVM 1058

Tuned Voltmeter The tuned voltmeter TVM 1058* is specifically designed for use with the LCI unit to detect 58 Hz voltage under very noisy conditions. In some instances, the residual 50 Hz or harmonic voltages on the earthing/grounding system or induced in the test circuits may be many times the 58 Hz test signal level. The TVM is able to filter out unwanted frequencies. This means very low levels of test voltage may be identified anywhere on the site under test, even where the background signal level is high.

The TVM has a high input impedance to ensure accurate reading of prospective touch, step and transferred voltages. It also has a switchable low input impedance (1 kO) to simulate a person's body impedance.

The TVM can also be used with a diesel genset when it is impractical to use the LCI unit.

Specifications

  • Power Supply:
 4x AA
  • Ranges:
 0-1.9999 V 0-19.999 0-199.99 V
  • Accuracy:
 ± 0.1% FSD ± 2 counts
  • Frequency:
 58 Hz ± 1 Hz
  • Sensitivity:
 5 mV
  • Input Impedance:
 1 M ohm /1 k ohm
  • Noise Rejection:
 > 70 dB
  • Display:
 > 4½ digit
  • Battery Life:
 40 hrs
  • Weight:
 200 g

* For 60 Hz systems TVM 1052 is available, and is tuned to 52 Hz ± 1 Hz
see also: Safe Engineering Services & Technologies for earth/ground modelling software


Finalist - IEE Innovation Awards 2005

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