NF CA5350, Инструкция по эксплуатации

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1.4 Principle of Operation
CA5350 1-4
1.4 Principle of Operation
The current signal input to CURRENT INPUT is amplified to a voltage signal by I/V
Amp, and output by an output amplifier after a low pass filter.
CURRENT
INPUT
CURRENT
SUPPRESSION
×1
×10
1μs～300ms
/OFF
INPUT
OVER
DETECT
10G/1G/100M
/10M/1M
/100k/10k
INVERTING
OUTPUT
OUTPUT
OVER
DETECT
SYSTEM
CONTROLLER
FRONT
PANEL
USB GPIB
POWER
SUPPLY
100V/120V/
220V/240V
～ LINE
INVERTING
BIAS OUTPUT
BIAS
ANALOG UNIT
INVERTING
BIAS OUTPUT
INVERTING
OUTPUT
CURRENT
INPUT
I/V
Amp Output
Amp FILTER
≒20Ω
ZERO
CHECK
Figure 1
–1 Block Diagram

ZERO CHECK
It disconnects the input connection and cut off the input current. It is used to check
whether there is current output from the sensor, or output offset from CA5350 itself.

CURRENT SUPPRESSION
It is equipped with CURERNT SUPPRESSION for canceling the offset current of the
sensor. Since the canceling offset current can be set up to ±0.8mA, and it is possible to
set a huge gain of I/V Amp, it can be well detected in high sensitivity even a weak
change in the current.