MR8740、MR8741_user_manual_eng_20191016H.pdf - 第72页
2.7 Performing Calibration (When Mounting MR8990) 60
2.7 Performing Calibration (When Mounting MR8990)
59
2
Chapter 2 Measurement Preparations
This procedure compensates for MR8990 Digital Voltmeter Unit differences.
The compensation procedure is performed for all channels and ranges.
In the following cases, calibration should be executed again.
• When a module was changed.
• When power was turned off and on again.
• When settings were initialized (system reset).
• When the ambient temperature has changed significantly.
2.7 Performing Calibration (When Mounting
MR8990)
• Before performing this procedure, allow the equipment to warm up for about 30 minutes after the
power is turned on to enable the internal temperature of the modules to stabilize.
• Note that calibration cannot be performed during measurement. However, if the calibration setting is
set to ON, calibration is performed at the start of measurement.
• Mouse operations are not accepted during calibration. (The procedure may take several seconds.)
Before starting calibration
Procedure
To open the screen: Right-click and select [CHAN] [Unit List] sheet
1
Move the flashing cursor to the [Zero-Adjust].
2
Select [Execute Zero-Adjust].
Calibration is executed.
2.7 Performing Calibration (When Mounting MR8990)
60
3.1 Ensuring Measurement Safety
61
3
Chapter 3 Measurement Procedure
7
Be sure to observe the following points, to ensure safe measurement.
Measurement
Procedure Chapter 3
3.1 Ensuring Measurement Safety
The maximum rated input voltage and maximum rated voltage versus ground
values for modules and connection cables are listed in the table below. In order
to prevent the risk of electric shock and damage to the equipment, make sure
that these voltages are not exceeded.
The maximum rated voltage versus ground does not change also when an atten-
uator or similar is used at the input. Take the connection method into consider-
ation and make sure that the rating is not exceeded.
Module
Maximum rated
input voltage
Maximum rated voltage
versus ground
8966 Analog Unit 400 V DC 300 VAC/DC (CAT II)
8967 TEMP Unit - 300 VAC/DC (CAT II)
8968 High Resolution Unit 400 V DC 300 VAC/DC (CAT II)
8969 Strain Unit - 33 V rms / 70 V DC
U8969 Strain Unit - 30 V rms / 60 V DC
8970 Freq Unit 400 V DC 300 V AC/DC (CAT II)
8971 Current Unit - Not insulated.
8972 DC/RMS Unit 400 V DC 300 V AC/DC (CAT II)
8973 Logic Unit - Not insulated.
MR8990 Digital Voltmeter Unit 500 V DC AC/DC 300 V (CAT II)
U8974 High Voltage Unit
1000 V DC 1000 V AC/DC (CAT III)
700 V AC 600 V AC/DC (CAT IV)
U8979 Charge Unit 40 V DC 30 V AC, 60 V DC
MR8740/
MR8741
Memory HiCorder
Module
GND
Maximum rated
input voltage
H
L
Maximum rated volt-
age versus ground