TG1 is a capacitance and dissipation factor measuring bridge, featuring manual balancing using analogue zero indicator or fully automatic balancing
- for high voltage insulation diagnostics, allows precise measurement of capacitance and dissipation factor
- tan delta uncertainty 1E-5
- measures impedances in all four quadrants
- built-in RS232 interface
- PC usersoftware available (option)


TG-3 is a fully automatic capacitance and dissipation factor (power factor) measuring bridge for high precision high voltage insulation diagnostics.
- uncertainty for dissipation factor (power factor) 1E-5
- measures impedances in all four quadrants
- built-in RS232 interface
- Options: higher CX current range, PC user software

Universal low cost capacitance and dissipiation factor measuring bridge for high voltage insulation diagnostics.
- very easy to operate
- capacitance measuring range up to 10'000 x CN
- measurement of grounded and ungrounded objects
- tan delta uncertainty 1E-4
- test object current up to 10 A
- automatic interference suppression (option)
- RS232 interface for data transfer and remote control
- lightweight unit of only 9 kg

- measurements and operation according IEEE standard 62
- built-in standard capacitor 100 pF / 12 kV
- built-in automatic interference suppression
- tanDelta uncertainty 1E-4
- data storage feature: 10 files with up to 50 records each
- RS232 interface for data download
- Options: measurement of temperature and humidity;

measurement of short circuit inductance of transformers;
resonating inductor; oil test cell; adapter for ext. standard

FT - 12

Full automatic 12kV capacitance and dissipation factor field test set. Consists of two units, weight only 50 kg total.


Calibration standard for tangens delta measurement
- built-in ultra stable standard capacitor 100 pF / 12 kV
- easy check of tan delta over a wide range
- full traceability to international standards
- rugged construction for field use


Oil test cell for measurement of insulation liquids. Measurements according to IEC 250 and IEC 247
- volume of oil sample 0.2 l
- inter electrode distance 2.5 mm
- capacitance of the empty cell approx. 50 pF
- maximum test voltage 12 kV

Technical Data


Resonating Inductor
- extends power rating of FT-12 HV source up to 50 kVA
- provides resonance for test objects from 50 nF up to 1uF
even at 60 Hz
- test object current up to 4.5 A
- easy tuning
- over temperature protection
- weight below 100 kg

Technical Data

Nearly every high-voltage equipment prior to delivery to the customer will undergo a test related to C and tan delta for a final quality control. Such tests are in general made at a frequency for which the equipment is designed. The reasons for the tests are firstly that too high losses (= high tan delta) may cause a breakdown or, secondly, the manufacturer of a specific equipment knows the typical magnitudes which can be tolerated and which provide information about the quality of newly manufactured equipment, and these measurements can also serve for a comparison with later preventive measurements.
Such tests are in general made in dependence of the test voltage applied; both magnitudes, capacitance and dissipation factor shall be essentially constant with increasing voltage, as insulation systems are linear systems and any „tip-up“ of the tand with voltage level, called „ionisation knee“, is a preliminary indication of partial discharges in the system which can lead to a failure of the insulation system.