
2-13
IM 701240-01E
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2
1
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9
10
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App
Index
Explanation of Functions
Shunt Calibration
The 701271 (STRAIN_DSUB) supports shunt calibration.
*
Shunt calibration refers to the act of correcting the gain of the strain measurement by
connecting a known resistance (shunt calibration resistance) to the strain gauge in parallel.
For a description of the basic defining equation of strain, see appendix 9. For details on
shunt calibration, see appendix 10.
Acceleration Measurement «For procedures, see section 5.16.»
The Acceleration/Voltage Module (with AAF) (701275 (ACCL/VOLT)) measures
acceleration using the output signal from the acceleration sensor. Direction connection is
possible to a built-in amplifier type acceleration sensor. Direct connection is not possible
to a charge output type acceleration sensor that does not have a built-in amplifier.
Current Supply to Acceleration Sensors
The 701275 (ACCL/VOLT) can supply 4 mA of current to the acceleration sensor when
measuring acceleration.
Filter
If you set the bandwidth limit to Auto, the anti-aliasing filter (AAF) and low-pass filter are
enabled depending on the sample rate to eliminate high-frequency noise from the input
signal. Using the anti-aliasing filter when measuring voltage allows elimination of aliasing
noise resulting from FFT computation. The filter is effective not only during acceleration
measurement but also during voltage measurement.
Frequency Measurement «For procedures, see section 5.17.»
The Frequency Module (701280 (FREQ)) measures frequency, number of rotations,
period, duty cycle, power supply frequency, pulse width, pulse integration, and velocity.
Measurement Items
Frequency
Frequency (Hz) = 1/T
w
(s)
Period
Period (s) = T
w
(s)
T
w
(s)
RPMs/RPSs
RPMs = Frequency (Hz)/the number of pulses per rotation (Nr)
×
60
RPSs = Frequency (Hz)/the number of pulses per rotation (Nr)
F (Hz)
Nr: The number of
pulses per rotation
2.2 Setting the Horizontal and Vertical Axes