Example - Campbell GRANITE VOLT Series Product Manual

b. At that measurement rate, what is the best attainable resolution for the measurements?
Resolution increases as the f
equation for f
N1
With a measurement time of 5 ms (5000 µs), settling time of 100 µs, and 7 repetitions, f
must be greater than 13807 Hz.
Thus, to improve measurement resolution, f
voltage measurement range and resolution
9.012 µVRMS for the largest voltage range, ±5000 mV.
D.3 Example 3
How fast can a VOLT 116 measure ten 3 kΩ full-bridge sensors using the default settling time (500
µs) and both excitation and input reversal, and achieve a resolution of less than 1 µV
easier wiring, limit the sensors excited per excitation terminal to four.
The full-bridge measurement, BrFull(), makes a differential measurement. It is given that the
measurement will use input reversal, so the resolution is given in the third column of
voltage measurement range and resolution
within the ±5000 mV range, f
The measurement time is figured separately for each excitation channel used, where the
repetitions are the number of sensors excited on that channel. In this setup, three excitation
terminals are used, X1 – X3. The measurement times are given by the following equations:
decreases, but measurement time increases. Solving the
N1
gives the following:
must be 100 Hz or better.
N1
should be set to 15000. According to
N1
(p. 42), this would improve the resolution to
(p. 42). To achieve a resolution of less than 1 µV
N1
Analog
? For
RMS
Analog
RMS
VOLT 100 series 53