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Analog Section
Figure 4-3 shows the analog section block diagram. The 4263B analog section can be divided
into three sections, the signal source, transducer and vector ratio detector.
The signal source generates an ac, dc, or dc biased ac signal of which frequency and level
is set from the keyboard or by GPIB commands. The signal is applied to the DUT via the
High-Current (H
) connector. The current
owing through the DUT is current sunk into the
CUR
Low-Current (L
) connector, which serves as virtual ground.
CUR
The vector voltage across the DUT is detected by the voltage between High-Potential (H
)
POT
and Low-Potential (L
) connectors. The vector current
owing through the DUT is detected
POT
by converting the current
owing into L
connector to a corresponding voltage, using an I-V
CUR
converter.
One of the two outputs from the transducer is selected in the vector ratio detector by
switch SW2. The selected signal is processed according to measurement conditions, such
as measurement time and measurement range, and is converted into digital data by the
Analog-to-Digital Converter (ADC).
T roubleshooting
4-5
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