The IDAX300 and IDAX350 insulation diagnostic analysers are insulation diagnostic instruments 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.


This IDAX series consists of:

  • IDAX300: A compact and light three-channel input (red, blue, and ground), three-terminal (generator, measure, and guard) and one ammeter instrument for use with an external computer that runs the IDAX diagnostic software.
  • IDAX300/S: Like the IDAX300, but with two ammeters for two simultaneous measurements.
  • IDAX350: Like the IDAX300/S, but housed in a rugged and waterproof case together with an on-board computer that can also be used to control other Megger instruments.

For extended applications, the IDAX interfaces seamlessly with the VAX020 high voltage amplifier for 2 kV.


In these instruments, the IDAX software incorporates a new ITC corrected frequency sweep specifically designed for assessment of instrument transformers and bushings. Thanks to a novel approach to the combination of time and frequency domain data, the IDAX provides the shortest measurement time in the marketplace for a full DFR measurement from 1 kHz to 10 μHz. Separate reference models are fitted to each data set (time or frequency) prior to transformation and combination, which eliminates the risk of artifacts introduced by approximations or transformation of incomplete data sets.

General

Mains voltage: 100 – 240 V ±10 %, 50 / 60 Hz

Power consumption: 250 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)


Inaccuracy:

IDAX300 (at 200 Vpeak):

>1000 pF: 0.5 % of rd + 0.01 % absolute

>300 pF: 0.5 % of rd + 0.02 % absolute

>10 pF: 0.5 % of rd + 0.10 % absolute

With VAX020 amplifier (at 2 kVpeak):

>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:

1 mA, 1:10 SNR (IDAX)

10 mA, 1:10 SNR (VAX020)

Max DC interference:

2 μA (IDAX) 20 μA (VAX020)


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


Outputs

Generator:

Voltage/current ranges, 10 V: 0 – 10 Vpeak, 0 – 50 mA peak

Voltage/current ranges, 200 V: 0 – 200 Vpeak, 0 – 50 mA peak

Frequency range: DC, 0.1 mHz - 10 kHz


External:

For external amplifier: E.g,. VAX020

IDAX300 and IDAX350 datasheet


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