Digital Capacitance Unbalance Meter

Digital R-C Unbalance Meter for communication cables. It has been shown that there are some losses resulting from the cable manufacturing process which affects the intelligibility of the telephone circuit. These are caused by the unbalances in the cable pairs which not only affect the uniformity of the line but it also makes the lines susceptible to induction from other sources such as power line harmonics, ground line, voltage noise, etc.
The degree of balance in communication circuit determines how susceptible the circuit will be to induce noise voltages. This R-C Unbalance Meter will be very useful for direct measurement of capacitance unbalances in the cable pairs. The instrument can measure resistance unbalance also. The pairs can be tested for capacitance and resistance unbalances in different configurations which are selected by a rotary switch. The Unbalance Meter is designed in such a way that it will not be sensitive to the effect of indirect couplings. This Digital R-C Unbalance Meter meets the long felt requirement of telecom cable industry. The instrument confirms to international specifications and yet is priced less than half of comparable instruments available in the international market.
TECHNICAL SPECIFICATIONS
Measurement Parameters:
  Resitance Unbalance DR1, DR2, DR3
  Capacitance Unbalance
  Pair to pair K1, K2, K3
  pair to ground E1, E2, E3
Measuring Ranges:
  Resistance Unbalaces - 19.99% to +19.99%
  Capacitance Unbalances - 1999 to + 1999 pF &
in two ranges. -19.99 to + 19.99 nF
Indication: 3½ Digit Panel Meter with sign
Resolution:
  Resistance Unbalance 0.01%
  Capacitance Unbalance 1 pF
Test Voltage:
  Resistance Unbalance 2 VDC
  Capacitance Unbalance 6 VAC
  with switchable frequencies 800 Hz & 1 KHz
Minimum Loop Resitance: 1 Ohm
Selection of Parameters: By means of rotary switch on front panel