Improving Voltage Measurement Quality; Deciding Between Single-Ended Or Differential Measurements - Campbell CR300 Series Product Manual

22.11 Improving voltage measurement quality

The following topics discuss methods of generally improving voltage measurements:

22.11.1 Deciding between single-ended or differential measurements

22.11.2 Minimizing ground potential differences
22.11.3 Minimizing power-related artifacts
22.11.4 Filtering to reduce measurement noise
22.11.5 Minimizing settling errors
22.11.6 Factors affecting accuracy
22.11.7 Minimizing offset voltages
Read More: Consult the following technical papers at
depth treatments of several topics addressing voltage measurement quality:
Preventing and Attacking Measurement Noise Problems
l
Benefits of Input Reversal and Excitation Reversal for Voltage Measurements
l
Voltage Accuracy, Self-Calibration, and Ratiometric Measurements
l
22.11.1 Deciding between single-ended or differential
measurements
Deciding whether a differential or single-ended measurement is appropriate is usually, by far, the
most important consideration when addressing voltage measurement quality. The decision
requires trade-offs of accuracy and precision, noise cancellation, measurement speed, available
measurement hardware, and fiscal constraints.
In broad terms, analog voltage is best measured differentially because these measurements
include the following noise reduction features that are not included in single-ended
measurements.
Passive Noise Rejection
l
No voltage reference offset
o
Common-mode noise rejection, which filters capacitively coupled noise
o
www.campbellsci.com/app-notes
22. Tips and troubleshooting 189
189
190
191
193
196
198
199
for in-