Measurement Computing Personal Daq rev.6.0 - Manual (Page 26)

2-6 General Information & Specifications 878595 Personal Daq User’s Manual
At a measurement duration of 610 milliseconds, the last two bits are considered unreliable, resulting in a
resolution of 22 bits. At a very fast measurement duration (12.5 milliseconds), the nine most least
significant bits are unreliable, resulting in 15 bit accuracy.
Speed vs. Resolution 1
Speed Designation
Measurement
Duration
(per channel)
Maximum
Sample Rate 2
(Samples/sec)
Resolution 2
(Bits RMS)
(-4 V to +4 V range)
Very Slow, 50 / 60 Hz rejection 610 ms 1.6 / sec 22
Slow, 50 Hz rejection 370 ms 2.7 / sec 22
Slow, 60 Hz rejection 310 ms 3.2 / sec 22
Medium, 50 Hz rejection 130 ms 7.7 / sec 21
Medium, 60 Hz rejection 110 ms 9.2 / sec 21
Medium 40 ms 25 / sec 19
Fast 20 ms 48 / sec 17
Very Fast 12.5 ms 80 / sec 15
Notes: 1. Each channel can have independent measurement duration and resolution.
2. The sample rates and resolutions shown were obtained with a 10-channel scan and with
continuous self-calibration disabled.
3. Duration does not include the use of CJC measurements.
Note: When measuring variable input signals (as opposed to relatively steady input signals), the variable
signals will require more samples/sec to obtain a realistic signal representation. Available sample
rates range from 1.6 samples per second up to 80 samples per second as indicated in the preceding
table.