I-V Converter; I-V Converter Block Diagram - Agilent Technologies 4349B Service Manual

I-V Converter

Figure 4-4 shows the I-V converter block diagram.
Figure 4-4. I-V Converter Block Diagram
The I-V Converter is essentially an integrator composed of an operational ampli er and a
capacitor. When current Ix ows into the integrator, the current charges the capacitor. As a
Ix
result, the integrator outputs a negative going ramp of which slope is . The current Ix can
C
1
v
be obtained by , where 1t is a certain time interval, and 1v is the output voltage drop
C
1
t
for this interval.
Capacitor C, which is called the range capacitor, determines the applicable measurement range
in practical integrator.
4-6 T roubleshooting