IDAX322 Insulation Diagnostic Tester
The IDAX 322 insulation diagnostic tester is a high voltage instrument based on DFR (Dielectric Frequency Response), also known as FDS (Frequency Domain Spectroscopy). DFR is a measurement technique in which capacitance and losses (dissipation factor/tan delta or power factor) is measured over multiple frequencies to assess insulation condition in test objects such as power transformers, bushings, and instrument transformers. DFR technology is an established test procedure in laboratories that Megger has adapted for field use in the IDAX range of instruments.
In the latest release, the IDAX software incorporates a new ITC corrected frequency sweep specifically designed for assessment of instrument transformers and bushings. The IDAX is exceedingly easy to use with an automated test flow and presentation of results in an easy to understand 'traffic light' colours. The IDAX DFR method is now part of international guides and standards e.g., Cigre TB 254, Cigre TB 414, Cigre TB 445, Cigre TB 775, IEEE C57.152-2013, IEEE C57.161-2018.
General
Mains voltage: 100 – 240 V ±10 %, 50 / 60 Hz
Power consumption: 180 VA (max)
Measurement section
Inputs: Red, blue, ground
Capacitance range: 10 pF – 100 μF
Inaccuracy: 0.5 % + 1 pF
Tan delta range: 0 - 100 (with retained accuracy of capacitance; otherwise higher)
Power factor range: 0 - 1 (with retained accuracy of capacitance; otherwise higher)
Accuracy at 2kVpeak:
>100 pF: 0.5 % of rd + 0.01 % absolute
>30 pF: 0.5 % of rd + 0.02 % absolute
>10 pF: 0.5 % of rd + 0.03 % absolute
Max AC interference: 10 mA, 1:10 SNR
Max DC interference: 20 μA
Typical measurement durations
DFR | PDC | Equiv. freq. range | Time
1 kHz-10 mHz | — | 1 kHz - 10 mHz | 5 min
1 kHz- 1 mHz | — | 1 kHz - 1 mHz | 36 min
1 kHz- 1 mHz | — | 1 kHz - 1 mHz | 23 min
1 kHz - 0.1 Hz | 1000 s | 1 kHz - 1/0.1 mHz | 18 min
1 kHz - 0.1 Hz | 10000 s | 1 kHz - 100/10 μHz | 2 h 55 min
Time domain current measurement (PDC)
Range: ±50 mA
Resolution: 0.1 pA
Inaccuracy: 0.5% ±1 pA
Input resistance (DC mode): ≤10 kΩ
Generator outputs
Voltage/current ranges, 10 V: 0 – 10 Vpeak, 0 – 50 mA peak
Voltage/current ranges, 2kV: 0 – 2kVpeak, 0 – 50 mA peak
Frequency range:
10 Vpeak - DC - 10kHz
2 kVpeak - DC - 1kHz
