Megger IDAX Series, Руководство пользователя

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IDAX 9
© 2009 Megger AB
1.3 Software Installation
The IDAX-206 come with the measurement and display software already installed on the
internal computer. On the IDAX-300 and if you want to use the IDAX-206 with an external PC
you have to install the software.
To start installing the software insert the USB memory stick and run the program IDAXInstall
XXXX.exe from it.
When first starting the IDAX software after installing it make sure the IDAX206/300 is
connected and turned on. For the IDAX-206 also check that the switch in the rear panel is set to
EXT USB. When the software starts it will look for the IDAX hardware and connect to it
automatically.
1.4 Measurement Technique
Short overview of measurement principle is given in this section.
How impedance is measured Gives basic principle of IDAX operation
Sample modeling Describes theoretical models used for presenting measurement
results
1.4.1 How Impedance is Measured
IDAX measures impedance. By measuring the impedance at one point, i,e, at a specific
frequency and amplitude, parameters such as resistance, capacitance and loss can be calculated.
The impedance of a sample is measured by applying a voltage across the sample. This voltage
will generate a current through the sample. By accurately measuring the voltage and the
current, the impedance can be calculated, see illustration below.
A V
Z U
I
Electrometer Voltmeter
Computer with
DSP-board
Voltage source
Sample
Measured voltage
Measured current
Control voltage
Fig.1. Measurement of electrical impedance.
The impedance is calculated using Ohm's law:
where Z, U and I are complex entities.
The voltage (and the current) is generated by a voltage source. There are currently two internal
voltage sources available in the IDAX system, which can deliver a maximum peak output of
10 Vpeak and 200 Vpeak, respectively. The voltage is measured by means of a voltmeter and