Wide range of applications

A wide range of calibration charge injectors are offered, suitable for use in calibrating partial discharge measurements. The appropriate choice of a calibration instrument depends on the range of typical charge values of the PDs being measured. Calibrators can also be used for TDR (time domain reflectometry) in cables to determine cable length and location of joints.

Conformity to International Standards

New calibrators are shipped with the calibration certificate to ensure traceability to international standards. However, factory calibration is also offered, which is more convenient than formal traceability if the latter is not required.

Simple to Use

The calibrator is switched on with the pushbutton On/Off. Both amplitude (Range) and polarity (Pos/Neg) of the single charge pulse per cycle are displayed and can be adjusted by pressing the two buttons. Each calibrator is also available, supplying two pulses per cycle and double impulse output with adjustable intervals. The instrument automatically synchronises to line frequency by a photodiode. In case of insufficient pick-up of power frequency light, the calibrator automatically selects the internal quartz oscillator (50Hz and 60Hz versions available).

Unique Concept

La linea dei generatori di impulsi di calibrazione è unica in quanto l'impulso di carica viene generato immettendo uno step di tensione variabile (correlato a un riferimento interno) tramite un condensatore fisso. Questo condensatore di immissione è relativamente piccolo, poiché il gradino di tensione ammonta a 120 V per l'uscita a gamma completa. Pertanto, i calibratori offrono eccellenti proprietà di impulso. Inoltre, il calcolo del fattore di correzione di solito non è necessario (CI << CS).

Calibration Impulse GeneratorRangeInjection Capacitor50 or 60 Hz light syncIEC602702 pulses / cycle optionBNCRemarks
CAL1A1,2,5,10,20,50,100 pC<1 pFYesYesYesYesCable and transformer tests
CAL1B100,200,500 pC, 1,2,5,10 nC<100 pFYesYesYesYesHigh-level application, e.g., rotating machines
CAL1C1,2,5,10,20,50,100 pC* a 100 pFV (50 Ω)YesYesYesYesIncl. ext. capacitor 100pF; cable tests
CAL1D10,20,50,100,200,500,1000 pC<10 pFYesYesYesYesLaboratory use, transformer tests
CAL1E0.5,1,2,5,10,20,50 nC<500 pFYesYesYesYesSee CAL1B
CAL1F0.2,0.5,1,2,5,10,20 nC<200 pFYesYesYesYesSee  CAL1B
CAL1G0.02,0.05,0.1,0.2,0.5,1,2 nC<20 pFYesYesYesYesTransformer tests
CAL1H(N+S)0.5,1,2,5,10,20,50 pC* at **pFV (50 Ω)YesYesYesYesGIS, live injection via stray capacitance

10,20,50,100,200,500,1000 pC* at 100 pF 

100,200,500,1000,2000,5000,10000 pC* at 1 nF

V (50 Ω)YesYesYesYesIncl. ext. capacitor 100pF/1nF. switschable; transformer tests

0.5,1,2,5,10,20,50 pC

<1 pFYesYes-NoGIS & UHF
CAL2B(I500)2,5,10,20,30,40,50 V (in 50 Ω)V (50 Ω)Yes--NoGIS & UHF
CAL2C(I500)1,2,5,7,10,12,15,17,20 V (in 50 Ω)V (50 Ω)Yes--NoGIS & UHF
CAL2D(I500)5,7.5,10,15,20,30,40 V (in 50 Ω)V (50 Ω)Yes--NoGIS & UHF
CAL3A600 kHz up to 1.35 MHz, 10 µV up to 10 mVV (50 Ω)YesYesRIV calibration; NEMA 107 compliant
CAL3B400 kHz up to 1.9 MHz, 10 µV up to 10 mVV (50 Ω)YesYesRIV calibration; NEMA 107 compliant
CAL3D400 kHz up to 1.9 MHz, 10 µV up to 10 mV (in 3000 Ω)V (>20 KΩ)YesYesRIV calibration; CISPR 18-2 compliant

*incl. ext. high voltage capacitor

**value to be specified by client

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