126 Chapter 5
Setting Measurement Conditions
Setting Measurement Accuracy, Stability, and Time
Setting Measurement Accuracy, Stability, and Time
Setting measurement bandwidth
Step 1. Press the [Bw/Avg] key to display the measurement bandwidth/averaging menu.
Step 2. Press the
BANDWIDTH [ ] key to display the measurement bandwidth setting menu.
Step 3. Select the measurement bandwidth.
Step 4. Press the
return key to return to the measurement bandwidth/averaging menu. Note that
the measurement bandwidth currently selected is displayed in the key label
[] of the
BANDWIDTH [ ] key.
NOTE Setting a greater measurement bandwidth will improve measurement accuracy, but keep in
mind that this requires a longer measurement time.
Averaging between sweeps (sweep-to-sweep averaging)
Sweep-to-sweep averaging computes each data point (vector value) based on an
exponential average of consecutive sweeps weighted by a user-specified averaging factor.
The sweep-to-sweep uses the algorithm shown in Equation 5-1.
Equation 5-1 Sweep-To-Sweep Averaging Algorithm
where:
Measurement bandwidth Key stroke
1 (measurement speed maximized)
1FAST
2 2
3 3
4 4
5 (measurement accuracy maximized) 5 PRECISE
Softkey label Selected measurement bandwidth
BANDWIDTH [1] 1 (measurement speed maximized)
BANDWIDTH [2] 2
BANDWIDTH [3] 3
BANDWIDTH [4] 4
BANDWIDTH [5] 5 (measurement accuracy maximized)
A
n
S
n
F
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1
1
F
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–
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æö
A
n 1–
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