1.4 Principle of Operation
1-7 ZM2376
Oscillator
The oscillator generates sine wave signals having exact frequencies by means of a direct digital
frequency synthetic method based on the reference clock of crystal oscillator.
When the Automatic Level Control (ALC) function is effective, the main processor adjusts
automatically the signal level so that the voltage and current monitored values become the specified
values.
Impedance Bridge
The current flowing in the DUT is converted into the voltage by the range resistance and differential
amplifier. At this time, the potential of L
CUR
between L
POT
terminals is maintained to almost zero by
automatic balancing motion of the bridge. Accordingly, the current that runs away to the ground
through capacitance to earth and insulation resistance and is not detected can be reduced.
The voltage applied to the DUT is detected by the differential amplifier.
After that, the voltage signal and current signal are converted into digital values by the A/D converter,
and sent to the main processor.
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