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Using the SCC-ACC01
Scaling Voltage Measurements
© National Instruments Corporation
ACC
Figure 1. SCC-ACC01 Signal Connections
The signal source can be floating or ground-referenced. The SCC-ACC01
input circuitry includes high-impedance bias resistors typically required for
floating sources. External bias resistors connected to ground are not
required.
For floating signal sources in high-noise environments, connect the
negative terminal of the signal source to the AI GND terminal on the
SC-2345 screw-terminal block to reduce common-mode noise.
For information about how to configure the SCC-ACC01 module using
NI-DAQmx, refer to the SCC Quick Start Guide.
If you configured the SCC-ACC01 using Measurement & Automation
Explorer (MAX) and are using NI-DAQ, the reading you get from the
E Series DAQ device is properly scaled. Use scaling constants obtained
from your sensor data sheet to convert the accelerometer voltage to the
desired unit, such as newtons, m/s
following steps to scale the readings:
1.
Measure the accelerometer voltage.
a.
Read the accelerometer channel on the E Series DAQ device
V
(CHX).
ESERIES
b.
Calculate the accelerometer voltage using this formula:
where
V
is the SCC-ACC01 input voltage.
ACC
V
ESERIES
SCC-ACC01
4
+
I
(4 mA)
EX
–
3
2
AC
+
–
Coupling
1
2
, or g. Otherwise, complete the
V
= V
ACC
ESERIES
is the E Series DAQ device input voltage.
5
SCC-ACC01 Accelerometer Input Module User Guide
19 kHz
E Series
Lowpass
AI ( X )
Filter
/2
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