5-34
IM 701210-05E
5.17 Setting the Strain Measurement
Explanation
Select the Range Unit
The unit can be changed between “the strain unit (
×
10
–6
strain):
µ
STR” and “the output
unit of the strain gauge transducer: mV/V.” The default value is
µ
STR. The following
equation is used to derive mV/V.
mV/V = 0.5
×
(
µ
STR/1000)
Selecting the Range
Select from the following:
• When
µ
STR Is Selected
500
µ
STR, 1000
µ
STR, 2000
µ
STR, 5000
µ
STR, 10000
µ
STR, and 20000
µ
STR
For a description of the measurement range, see chapter 19.12, “Module
Specifications.”
• When mV/V Is Selected
0.25mV/V, 0.5mV/V, 1mV/V, 2.5mV/V, 5mV/V, and 10mV/V
For a description of the measurement range, see chapter 19.12, “Module
Specifications.”
The value that is indicated at the right side of the range display is the maximum input
at the current bridge voltage converted to volts. It indicates the maximum input
voltage at the selected range.
Setting the Display Range: Upper/Lower
You can change the upper and lower limits of the display range according to the input for
easier viewing of the measured waveforms.
Selectable range: –3.0000E+04 to +3.0000E+04 (when set to
µ
STR)
–1.5000E+01 to +1.5000E+01 (when set to mV/V)
Be sure the upper limit value (Upper) is greater than the lower limit value (Lower).
Selecting the Bridge Voltage: Excitation
You can select the voltage to be applied to the bridge head.
• 2 V:
When the bridge head resistance (bridge resistance) is 120
Ω
to 1000
Ω
• 5 V
1
:
When the bridge resistance is 350
Ω
to 1000
Ω
• 10 V
1
: When the bridge resistance is 350
Ω
to 1000
Ω
The bridge voltage cannot be changed while waveform acquisition is in progress.
1. The bridge voltage can be set to 5 V or 10 V only when the following conditions are met.
• The bridge resistance is 350
Ω
or more
• Strain gauge transducer supports the bridge voltage of 5 V or 10 V.