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Voltage Sense Ampli er and Process Ampli er Sections
These sections measure the voltage across the DUT and processes the outputs from the voltage
sense ampli er and the current sense ampli er. Figure 4-6 shows this section's block diagram.
The voltage sense ampli er, which is a di erential ampli er, measures the vector voltage across
the DUT via the High-Potential (H
) and Low-Potential (L
) connectors.
POT
POT
The output of the voltage sense ampli er is fed back to the signal source section for dry circuit
measurement.
SW1 in the process ampli er selects the inputs from the voltage sense ampli er and current
sense ampli er to be processed. The selected signal is attenuated according to the range
resistor setting. The lter passes the fundamental signal (1 kHz) in order to purify the signal
for accurate and stable measurement. The ltered signal is converted into digital data to be
processed by the digital section.
4-8
T roubleshooting
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