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6 Advanced Source and Measurement Functions
Averaged Measurements
174
Power Module
N6751A, N6752A, N6761A, N6762A 25.4 µF
N6753A, N6755A, N6763A, N6765A 4.7 µF
N6754A, N6756A, N6764A, N6766A 2.2 µF
N6773A
N6774A
N6775A
N6776A, N6777A
For example, if you are measuring the output current on an Agilent
N6731B with a 10 ohm load connected to the output, and with
dynamic current correction turned off, the largest frequency that can
be measured without introducing measurement errors is 530 Hz. If a
1 ohm load were connected to the output, the largest frequency that
could be measured without errors would be 5.3 kHz.
For frequencies above the maximum measurable frequency, the
current flowing in the output capacitor causes the measured current
to be greater than the actual output current by a factor of +20 dB per
decade increase of frequency.
Measurement values returned in Meter View, Scope View, and by the
Data Logger are averaged. Each measurement value is an arithmetic
average of all the data points in the specified sample period. The
average is calculated as follows:
Σ
N
x
i
i = 1
A
=
N
The sample period of the Meter View depends on the number of
power line cycles (NPLC) specified for each measurement sample.
The sample period of the Scope View can be adjusted indirectly by
using the Horizontal Time/Div knob to adjust the horizontal time
base. The sample period of the Data Logger can be adjusted by
pressing Data Logger, then Properties, and entering a value in the
Sample Period field.
Note that in the Scope Marker View, you can view the average value
as well as the minimum and maximum value of the sample period
that is located between the two markers.
C
Value
Power Module
O
N6731B, N6741B
N6732B, N6742B
N6733B, N6743B
13.2 µF
N6734B, N6744B
11.2 µF
N6735B, N6745B
4.02 µF
N6736B, N6746B
3.54 µF
A = the average
N = the number of data points
x
= the i
data point
th
i
Model N6705 User's Guide
C
Value
O
30 µF
23.5 µF
13.4 µF
9.8 µF
12.8 µF
3.52 µF
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