YOKOGAWA WT310EH User Manual

App-34
IM WT310E-01EN
Appendix 7 Block Diagram
Block Diagram
VOLTAGE
±
LPF
500 Hz
LPF
500Hz
A/D
Isolator
Isolator
Zero
crossing
Detector
Peak
Detector
CURRENT
±
External current
sensor input
(EXT, option)
Voltage input circuit
Current input circuit
Input element 1
Input elements 2 and 3
FPGA
CPU
7 segment
LED
USB port
(PC)
GP-IB
or
RS-232
Ethernet
(option)
D/A output
(option)
KEY
Voltage input
Current input
A/D
Zero
crossing
Detector
Peak
Detector
LPF
500 Hz
Isolator
CURRENT
Current input circuit
Current input
A/D
Zero
crossing
Detector
Peak
Detector
WT310E current input (CURRENT INPUT)
±
External current
sensor input
(EXT, option)
Input Signal Flow and Process
Input elements 1 through 3 consist of a voltage input circuit and a current input circuit. The input
circuits are mutually isolated. They are also isolated from the case.
Thevoltagesignalthatisappliedtothevoltageinputterminal(VOLTAGE,±)isnormalizedusingthe
voltage divider and the operational amplifier (op-amp) of the voltage input circuit. It is then sent to a
voltage A/D converter.
The current input circuit is equipped with two types of input terminals, a current input terminal
(CURRENT,±)andanexternalcurrentsensorinputterminal(EXT).Onlyonecanbeusedatany
given time. The voltage signal from the current sensor that is received at the external current sensor
input terminal is normalized using the voltage divider and the operational amplifier (op-amp). It is then
sent to a current A/D converter.
The current signal that is applied to the current input terminal is converted to a voltage signal by a
shunt. Then, it is sent to the current A/D converter in the same fashion as the voltage signal from the
current sensor.

YOKOGAWA WT310EH Specifications

General

Brand	YOKOGAWA
Model	WT310EH
Category	Measuring Instruments
Language	English