Megger frax 101 - 5 Appendices; Appendix A: Calibration Instruction

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FRAX User's Manual
© 2011 Megger Sweden AB
5
Appendices
5.1 Appendix A: Calibration Instruction
The calibration of a FRAX can be performed through an automated process by use of the
FraxCal software. The FraxCal utilizes an Agilent 34401A or or an Fluke 8845A/8846A DMM
(digital multi meter) and a FRAX calibration adapter connected to the FRAX generator output
and measuring input channels.
Preparing for calibration
To perform the automatic calibration the following equipment is necessary:
Agilent 34401 DMM or Fluke 8845A/8846A
FRAX calibration set including the following:
Calibration Adapter CAL-101
1 pce DB-9 standard serial cable
1 pce 2 x 4mm banana plug to BNC coaxial converter
3 pcs 50 ohm coaxial cables with BNC connectors, 0.5 meter length
1 pce 50 ohm coaxial cable with BNC connectors, 2 meter length
FraxCal software
Note that the coaxial cables from the FRAX to the calibration box needs to be of equal
length.
Connecting the equipment
Install the FraxCal software on your computer (Windows XP or Windows Vista)
Connect the FRAX AC/DC adapter and put the FRAX mains switch in the ON position (I)
Ground the FRAX using the ground screw.
Connect the FRAX with the USB cable to one of the USB ports on the computer
Connect the DMM to the computer, using the serial cable. If the computer lacks a serial
interface, a serial/USB adapter can be used.
Connect the FRAX to the Calibration Adapter CAL-101 according to the figure below:
0.5 meter 50 ohm coaxial cable from FRAX Generator to CAL-101 IN
0.5 meter 50 ohm coaxial cable from FRAX Reference to BNC Y adapter
0.5 meter 50 ohm coaxial cable from FRAX Measure to BNC Y adapter
BNC adapter to CAL-101 OUT
2 meter 50 ohm coaxial cable from CAL-101 DET to DMM using the BNC to banana
adapter