MR8740、MR8741_user_manual_eng_20191016H.pdf - 第176页

7.9 Setting Details of Modules 164 Renew Data (Data Refresh) The data refresh rate can be set to Fast, Normal, or Slow. The default setting is [Normal] . T his allows stable measuremen t while removing noise. For quicker…

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7.9 Setting Details of Modules
163
6
Chapter 7 Utility Functions
7
See: Opening the [Each Ch] sheet, Making a Channel Selection (p.161)
Mode Set to match the type of thermocouple being used.
Select
RJC (Reference
Junction Compen-
sation)
When connecting a thermocouple directly to the module, select [Int].
Reference junction compensation is performed within the module. When con-
necting through a reference junction device (e.g., a 0°C control tank), select
[Ext].
Select
Burn Out A broken thermocouple wire can be detected during temperature measurement.
Normally when a thermocouple wire breaks, measured values exhibit random
instability.
Select
7.9.3 Setting Model 8967 TEMP Unit
Selections Measurement Range Selections Measurement Range
Temp- K
-200 to 1350°C
Temp- R
0 to 1700°C
Temp- J
-200 to 1100°C
Temp- S
0 to 1700°C
Temp- E
-200 to 800°C
Temp- B
400 to 1800°C
Temp- T
-200 to 400°C
Temp- W
0 to 2000°C
Temp- N
-200 to 1300°C
Selections Description
INT
Reference junction compensation is provided within the module.
(default setting)
(Measurement Accuracy: The sum of the accuracies of the temper-
ature measurement and the reference junction compensation.)
EXT Reference junction compensation is not provided within the mod-
ule.
(Measurement Accuracy: The accuracy of temperature measure-
ment only)
Selections Description
Off
Broken wires are not detected.
On Broken wires are detected.
Wire breakage is detected by sensing a miniscule current flow
(about 100 nA) through the thermocouple. If the thermocouple
wires are long or composed of a high-resistance material, set [Burn
Out] to [Off] to avoid measurement errors.
7.9 Setting Details of Modules
164
Renew Data
(Data Refresh)
The data refresh rate can be set to Fast, Normal, or Slow.
The default setting is [Normal]. This allows stable measurement while removing
noise. For quicker response, select [Fast], but note that this will make the mea-
surement more susceptible to noise. For further improved measurement stability,
select [Slow].
Select
Selections Description
Fast
Data are updated approximately every 1.2 ms.
Normal
Data are updated approximately every 100 ms. (default setting)
Slow
Data are updated approximately every 500 ms.
7.9 Setting Details of Modules
165
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Chapter 7 Utility Functions
7
The 8969 Strain Unit and U8969 Strain Unit can perform auto balance.
When auto balance is performed, the reference output level of the conversion
unit can be matched with the specified zero position.
It is applicable only to a 8969 Strain Unit and U8969 Strain Unit.
Before executing auto-balance ___________________________________
• Turn power on and wait 30 minutes to allow the internal temperature of the
module to stabilize.
• After connecting a strain gauge transducer to the module and a measuring
target,execute the autobalance without any input including distortion.
• Auto-balance cannot execute during measurement.
• Mouse operations are not accepted while auto-balance is executing.
To execute auto-balance_________________________________________
See: Opening the [Each Ch] sheet, Making a Channel Selection (p.161)
Auto Balance can also be executed from the Channel settings window (Analog
sheet) (if the range of a channel with installed strain unit is selected).
See: Opening the Channel settings window ([Analog] sheet): (p.76)
In the following cases, auto-balance should be executed again.
• After changing the vertical axis (strain axis) range
• After a module has been removed or inserted
• After the strain gauge transducer has been replaced
• After power has been turned off and on
• After performing a system reset
• When ambient temperature has changed significantly (the zero position may
drift)
7.9.4 Setting Model 8969 and U8969 Strain Unit
The instrument describes Model U8969 as “8969”.
Setting Item: [Range]
Selections Description
Auto Bal All
Chs
Auto-balance will be executed for all channels where a Model 8969
or U8969 Strain Unit is installed.
Auto Bal Ch 1
Auto-balance will be executed for the currently selected channel.
If "Warning: Auto balance failed." appears:
The channel on which auto-balance failed is displayed.
Verify the following, and execute again:
• Is the strain gauge transducer in a discharged state? (Make sure that it is not
being subject to vibration, etc.)
• Is the strain gauge transducer correctly connected to a measuring target?