Fluke 5790B - Statistics

Front Panel Operation
Basic Operation 4
4-17
Statistics
Located on the Main Menu, use the Statistics feature to sample the input signal
being measured and to calculate standard deviation of the signal in ppm and V
for various sample sizes. To access the statistics menu, push the Statistics
softkey. The Statistics menu is shown below.
+/- 22.0 ppm (90 Days) 7 days since verification
4/21/2015 10:52am
Minimum:
Max - Min:
1.0000
V0.999909
kHz
Standard
Deviation
in ppm
Set
Sample
Size
Stop
Sampling
Pause
Sampling
Back
Input 2
Auto Range 2.2 V
Maximum: Average:
Samples: 5
Standard
Deviation:
0.999899 V 0.999920 V
0.999909 V
7.500 uV
21.00 uV
hvi033.eps
Push the Statistics softkey to sample the input signal. Sampling automatically
starts. The Product accumulates samples from the input signal and shows
standard deviation and sample size on the measurement screen. Push the Stop
Sampling softkey to stop accumulating samples. Push the Pause Sampling
softkey to momentarily pause sampling, and then the Start Sampling softkey to
resume. Push the Clear Samples softkey to clear accumulated samples. The
Product starts to accumulate new samples.
Standard deviation of the samples can be shown in ppm of reading or in V. The
ppm standard deviation feature shows the standard deviation normalized to the
average value of the input signal. The V standard deviation shows the absolute
standard deviation measured in volts. Push either the Standard Deviation in
ppm and Standard Deviation in V softkeys to toggle between both display
modes.
Sample size is an important consideration because a smaller sample size results
in more uncertainty in the standard deviation calculation. It is useful to set up the
Product to accumulate a specified number of samples. Push the Set Sample
Size softkey to choose a sample size between 1 and 999. If no sample size is
chosen or if sample size is set to 0, the Product accumulates samples
indefinitely. After a sample size is chosen, the Product starts to accumulate
samples up to the specified amount of samples and then stops.
Push the Back softkey to exit the statistics mode and return to normal
measurement mode.