Transducer Section - Agilent Technologies 4263B LCR Service Manual

Transducer Section

The transducer section measures the vector voltage across the DUT, and the current owing
through the DUT by converting the current to voltage. The transducer also includes a switch
used by the Option 001 (Transformer Parameter Measurement), and the contact check voltage
source.
Figure 4-5 shows the transducer block diagram.
The voltage across the DUT is measured at the H and L connectors using a di erential
POT POT
ampli er.
The current owing through the DUT and owing into the L connector is converted to
CUR
voltage by an I-V converter. The di erential ampli er measures the voltage between an
I-V converter output and the inverting input of the converter. The inverting input of the
converter, thus L , is at virtual ground, because of the very high input impedance and very
CUR
high open loop gain of the operational ampli er used in the I-V converter.
T roubleshooting 4-7