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5−1
5
.
OPERATION THEORY
5.1 Flow of Measurement Signal (Refer to Fig.5-1)
Fig.5-1 Block diagram
The signal from the bridge box or a transducer is applied to the INPUT connector of this product and
amplified through a low-noise preamplifier. To this preamplifier are added the outputs of a 4-digit digital
calibration voltage generating circuit (CAL), a resistance unbalance adjusting circuit (R BAL) and a
capacitance unbalance auto eliminating circuit (C BAL), only the signal of which is fed to the subsequent
stage. The signal, which has been amplified through a main amplifier, is synchronously detected and
filtered, and then outputted via a signal isolation circuit and HPF. There are two output systems: the
output of OUTPUT1 is displayed on a level meter, while the output of OUTPUT2 is displayed on a digital
monitor. The output of an oscillator is also isolated by a transformer and fed to the isolation side, and then
used as bridge power supply.
E
B
A
C
D
Bridge Check
Cable Length Compensation
Calibration
Voltage
Generator
Resistance
Unbalance
Adjusting
Circuit
Capacitance
Unbalance
Auto Eliminating
Circuit
Bridge
Power Supply
(BV)
Carrier
Filter
CAL
RBAL
CBAL
HEAD
AMP
RANGE
ATT
RANGE
FINE
2nd
AMP
LPF
HPF
Input
Selection
Phase
Detection
Circuit
Isolated
Power Supply
Oscillator
(5kHz)
Isolated
Power Supply
Signal
Isolation
Circuit
Analog to Digital
Converter
OUTPUT2
ADJ
CPU
5V
Level
Meter
(17 dot LED)
Digital Monitor
(Four digits 1/2 LED)
Operation
Key
CAL Monitor
I/F
Connector
Isolation Side
OUTPUT 1
OUTPUT 2
12V DC
〜
100V AC(85 132V)
〜
200V AC(180 264V)
SELECT
Summary of Contents for 5683
Page 60: ...9 5 9 3 Dimensional Outline Drawing 9 3 1 Unit ...
Page 61: ...9 6 9 3 2 Panel Cut Sizes Square Hole ...
Page 63: ...9 8 9 3 4 Rack mounting Case Rack Rail Elongate Hole ...
Page 64: ...9 9 9 3 5 Fan Unit Fan 8CH Rack mounting Case Fan Unit Case ...
Page 65: ...9 10 9 3 6 Bridge Box 5370 and 5373 Attachment Hole ...
Page 66: ...9 11 9 3 7 Compact Bridge Box 5379 and 5380 ...
Page 67: ......