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 Generator | Range | Injection Capacitor | 50 or 60 Hz light sync | IEC60270 | 2 pulses / cycle option | BNC | Remarks |
| CAL1A | 1,2,5,10,20,50,100 pC | <1 pF | Yes | Yes | Yes | Yes | Cable and transformer tests |
| CAL1B | 100,200,500 pC, 1,2,5,10 nC | <100 pF | Yes | Yes | Yes | Yes | High-level application, e.g., rotating machines |
| CAL1C | 1,2,5,10,20,50,100 pC* a 100 pF | V (50 Ω) | Yes | Yes | Yes | Yes | Incl. ext. capacitor 100pF; cable tests |
| CAL1D | 10,20,50,100,200,500,1000 pC | <10 pF | Yes | Yes | Yes | Yes | Laboratory use, transformer tests |
| CAL1E | 0.5,1,2,5,10,20,50 nC | <500 pF | Yes | Yes | Yes | Yes | See CAL1B |
| CAL1F | 0.2,0.5,1,2,5,10,20 nC | <200 pF | Yes | Yes | Yes | Yes | See CAL1B |
| CAL1G | 0.02,0.05,0.1,0.2,0.5,1,2 nC | <20 pF | Yes | Yes | Yes | Yes | Transformer tests |
| CAL1H(N+S) | 0.5,1,2,5,10,20,50 pC* at **pF | V (50 Ω) | Yes | Yes | Yes | Yes | GIS, live injection via stray capacitance |
| CAL1J | 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) | Yes | Yes | Yes | Yes | Incl. ext. capacitor 100pF/1nF. switschable; transformer tests |
| CAL2A | 0.5,1,2,5,10,20,50 pC | <1 pF | Yes | Yes | - | No | GIS & UHF |
| CAL2B(I500) | 2,5,10,20,30,40,50 V (in 50 Ω) | V (50 Ω) | Yes | - | - | No | GIS & UHF |
| CAL2C(I500) | 1,2,5,7,10,12,15,17,20 V (in 50 Ω) | V (50 Ω) | Yes | - | - | No | GIS & UHF |
| CAL2D(I500) | 5,7.5,10,15,20,30,40 V (in 50 Ω) | V (50 Ω) | Yes | - | - | No | GIS & UHF |
| CAL3A | 600 kHz up to 1.35 MHz, 10 µV up to 10 mV | V (50 Ω) | Yes | Yes | RIV calibration; NEMA 107 compliant | ||
| CAL3B | 400 kHz up to 1.9 MHz, 10 µV up to 10 mV | V (50 Ω) | Yes | Yes | RIV calibration; NEMA 107 compliant | ||
| CAL3D | 400 kHz up to 1.9 MHz, 10 µV up to 10 mV (in 3000 Ω) | V (>20 KΩ) | Yes | Yes | RIV calibration; CISPR 18-2 compliant | ||
*incl. ext. high voltage capacitor **value to be specified by client |
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