The following plots represent data that were taken using a National Instruments USB-6221-BNC analog i/o board. The signal was the voltage across a 1N4148 diode when driven by a constant 100 μA current. The voltage is temperature dependent but the diode was maintained at room temperature with some slow variations.

There were two sets of data taken. In the first the number of samples and the sample rate were varied to maintain an acquisition duration of 0.1 s. The number of samples followed a 1-2-5 sequence from 2 to 10,000 samples.

The second set was taken by using the same sequence of number of samples but the data were taken at sample rates of 1 kHz, 10 kHz, and 100 kHz for each.

There are two plots for each case. The first shows the actual data
acquired. The caption includes the conditions (number of samples and
sample rate) as well as the mean value for the data and the standard
deviation for that data (σ_{S}). The number in
parentheses floowing the standard deviation is the estimate of the
standard deviation in the value of the mean given by
σ_{S}/N^{1/2}.
The second shows a histogram of the data overlaid by a Gaussian
calculated from the value of the mean and the standard deviation. The
bins were chosen to be separated by the code width of the USB-6221-BNC
operated at a gain of ±1 V with the centers at the values
returned from the board.

- Comparison for a
constant 0.1 s sample period with varying numbers of points.
- Comparison with a constant 1 kSamples/s rate with varying numbers of points.
- Comparison with a constant 10 kSamples/s rate with varying numbers of points.
- Comparison with a
constant 100 kSamples/s rate with varying numbers of points.
- Comparison for 2 points with a varying sample rate.
- Comparison for 5 points with a varying sample rate.
- Comparison for 10 points with a varying sample rate.
- Comparison for 20 points with a varying sample rate.
- Comparison for 50 points with a varying sample rate.
- Comparison for 100 points with a varying sample rate.
- Comparison for 200 points with a varying sample rate.
- Comparison for 500 points with a varying sample rate.
- Comparison for 1,000 points with a varying sample rate.
- Comparison for 2,000 points with a varying sample rate.
- Comparison for 5,000 points with a varying sample rate.
- Comparison for 10,000 points with a varying sample rate.