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Megger FRAX Series User Manual

Megger FRAX Series
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Charging is performed automatically when the AC/DC adapter is connected. The FRAX-101 does not have to
be turned on. To ensure long battery life, batteries will not be charged if the battery charge is higher than
90 % or if the temperature is above 40 °C. A complete charge takes approximately 8 hours.
The blue LED gives indication of charging status:
LED not lit FRAX turned o, or FRAX is switch-
ed on, battery empty.
LED blinking Charging
LED lit FRAX connected to AC/DC adapter,
Battery is fully charged (or charging
disabled of other reason see above)
LED lit FRAX runs on batteries (AC/DC
adapter not connected)
3.5. Ground loop detector
Embedded ‘Ground Loop Detector’ in FRAX checks the test setup and assures that all connections including
the grounding braids are properly connected. After pressing GLD button on FRAX the green/ red (“Pass/
Fail”) LED shows user status of the ground loop. In case of ‘’Fail’’ signal (red LED), the connections must be
checked. “Pass” signal (green LED) guarantees that the measurement results can be reproducible.
NOTE
Ground loop detector is not available in FRAX 99.
3.6. Sweep frequency response
FRAX “Generator” (Gen.) output generates sinusoidal voltage at a selected frequency. Two separate input
channels, “Reference” (Ref.) and “Measure” (Meas.) measure both the generated voltage and the response
voltage with respect to amplitude and phase.
The instrument stores “Amplitude” and “Phase” data for both “Reference” channel and “Measure” channel as
well as the ratio “Measure” divided by “Reference”. The values can be plotted and exported as Magnitude,
Phase, Impedance, Impedance-Phase, Admittance and more.
The Custom models function make it possible to calculate almost any parameter based on the measured/
stored data.
FRAX uses the sine correlation technique. This means that the input voltages are multiplied by a sine and a
cosine, and then averaged over an integer multiple of the interval of time. The sine, cosine and the voltage
applied have exactly the same frequency. The sine correlation technique is well known and is suitable for
Sweep Frequency Response Analysis (SFRA) measurements. Since the signals on the two input channels are
treated the same way, the phase resolution between these two channels is extremely high. The rejection
of DC oset and harmonics - referred to as the applied voltage - are in theory innite. By increasing the
integration cycles, the rejection gradually improves.
Instrument description
www.megger.com FRAX-series 17

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Megger FRAX Series Specifications

General IconGeneral
BrandMegger
ModelFRAX Series
CategoryMeasuring Instruments
LanguageEnglish

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