User`s guide

Operation and Connections Tutorial 5
Model N6705A User’s Guide 109
Power Module C
O
Value Power Module C
O
Value
N675xA, N676xA 25.4 µF N6731B, N6741B 30 µF
N6754A 4.7 µF N6732B, N6742B 23.5 µF
N6773A 13.2 µF N6733B, N6743B 13.4 µF
N6774A 11.2 µF N6734B, N6744B 9.8 µF
N6775A 4.02 µF N6735B, N6745B 12.8 µF
N6776A 3.54 µF N6736B, N6746B 3.52 µF
For example, if you are measuring the output current on an Agilent
N6731B with a 10 ohm load connected to the output and with
“Compensate current measurements” 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.
Averaged Measurements
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:
A = the average
N = the number of data points
x
i
= the i
th
data point
The sample period of the Meter View is fixed at 21 ms @ 50 kHz and
cannot be adjusted. The sample period of the Scope View can be
adjusted indirectly by using the Horizontal Time/Div knob to adjust
the horizontal timebase. 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.
The Data Logger Summary View also displays the minimum and
maximum value as well as the average value from the measurement
period displayed in the Data Logger View.
Σ
x
i
=
i = 1
N
N
A