Range Resistor And Current Sense Ampli Er Sections - Agilent Technologies 4338B Service Manual

Range Resistor and Current Sense Ampli er Sections
These sections measure current owing through the DUT. Figure 4-5 shows this section's block
diagram.
The range resistor converts the current to a proportional voltage which is measured. The range
resistor consists of four resistors, which are switched according to the signal source output
level.
The current sense ampli er, which is a di erential ampli er, ampli es the voltage across the
range resistor.
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