The CTS-30T was designed especially for testing electrical insulation systems in hostile environments where influence from nearby excited devices would normally interfere with reliable measurements. The test set is fully guarded with the voltage test frequency slightly shifted from the power frequency.

The instrument test frequency is close enough to the power frequency to give the required accuracy, but far enough to avoid power frequency influence on the measurement. The test frequency is 80 Hz. When the bridge is fully guarded, the measurement of each individual capacitance in a three or four terminal device is carried out effectively without performing calculations.

The test set is provided with a lead selector switch. Once the leads are connected, the test mode for the measurement required is easily selected, thus avoiding repeated disconnecting and reconnecting. Both grounded and ungrounded testing can be performed.

The numeric readout allows direct reading of capacitance in either pF or µF and the Dissipation Factor is expressed directly in percentage. The bridge balance is achieved by using a center scale null detector which is tuned, synchronous, and phase selective. The tuning reduces much of the unwanted power frequency interference. The synchronous operation makes the null detector sensitive only to the internal operating frequency.

The CTS-30T uses a transformer ratio arm technique in which the capacitive current of the test specimen is compared to the current from the built-in standard capacitance. This technique has been proven to be very accurate and reliable especially for applications in the power industry where much less than ideal operating conditions are often encountered.

• 3 terminal measurements with guard
• Grounded and ungrounded measurement tests
• Numeric readout
• Built in calibrator
• Lightweight and protable
• 1-year warranty