MR8740、MR8741_user_manual_eng_20191016H.pdf - 第182页

7.9 Setting Details of Modules 170 See: Opening the [Each Ch] sheet, Making a Channel Selection (p.161) Mode Switches between voltage meas urement and RMS measurement. Select Response Response can be set to three speeds:…

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7.9 Setting Details of Modules
169
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Chapter 7 Utility Functions
7
See: Opening the [Each Ch] sheet, Making a Channel Selection (p.161)
Mode There is no need to change the setting since it is set when the clamp sensor is
automatically recognized.
Select
*: When Model CT6846 or CT6865 is connected to Model 8971 Current Unit through Model 9318
Conversion Cable, the instrument recognizes that as an 500 A AC/DC sensor is connected;
set the scaling ratio to 2.00.
Range
Select
7.9.6 Setting Model 8971 Current Unit
Selections Description
20A/2V
Sets this option when Model 9272-10 (20 A range), 9277, or
CT6841 Clamp Sensor is connected. (default setting)
200A/2V
Sets this option when Model 9272-10 (200 A range), 9278,
CT6863, or CT6843 Clamp Sensor is connected.
50A/2V Sets this option when Model CT6862 Clamp Sensor is connected.
500A/2V
Sets this option when Model 9279, 9209, CT6544, CT6845,
CT6846*, or CT6865* Clamp Sensor is connected.
Selections Description
DC Current measurement (Default setting)
RMS RMS current measurement
• 8971 Current Unit cannot be used with MR8741.
• With MR8740, up to four 8971 Current Units can be used.
7.9 Setting Details of Modules
170
See: Opening the [Each Ch] sheet, Making a Channel Selection (p.161)
Mode Switches between voltage measurement and RMS measurement.
Select
Response Response can be set to three speeds: Fast, Normal and Slow.
Normally set to [Fast], this can be changed to [Normal] or [Slow] to stabilize the
display when measuring low frequencies, or when severe fluctuations are
present.
Select
7.9.7 Setting Model 8972 DC/RMS Unit
Selections Description
DC
Voltage measurement (default setting)
RMS
RMS measurement
Selections Description
Fast
Sets the response time to about 100 ms. (default setting)
Normal
Sets the response time to about 800 ms.
Slow
Sets the response time to about 5 s.
7.9 Setting Details of Modules
171
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Chapter 7 Utility Functions
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Frequency Set the power frequency.
Set 50 Hz or 60 Hz according to the power frequency for the region of use.
Select
NPLC PLC (Power Line Cycle) is the time equivalent to one cycle of the power fre-
quency.
Set the integration time based on one PLC.
Select
Example: When the power frequency is 50 Hz, and NPLC is set to 10, 20 ms x
10 = 200 ms.
The measurement data refresh rate becomes 200 ms.
Fast response Data can be refreshed at high speed.
Select
Calibration This setting is for performing calibration or synchronization between channels
automatically when measurement is started. Performing synchronization
between channels enables matching the timing for the start of integration.
7.9.8 Setting Model MR8990 Digital Voltmeter Unit
• When the MR8990 Digital Voltmeter Unit is installed on unit 1 (unit 1 or unit 2
in the case of MR8741), the standard logic can no longer be used.
• The resolution of the data measured by the recorder function is 16bit.
Selections Description
50Hz
Cycle 20 ms (default setting)
60Hz
Cycle 16.67 ms
If the power frequency setting is not configured correctly, measurement values
will be unstable.
0.1 to 0.9, 1 (default setting) to 10, 20, 30, 40, 50, 60, 70, 80, 90, 100
Selections Description
Off
Refreshes data at the integration time set for NPLC. (default set-
ting)
On
Calculates the moving average and refreshes the data at high
speed.
Refreshes the data at 0.1 PLC when NPLC is up to 9.
Refreshes the data at 1 PLC when NPLC is 10 or above.