Keysight InfiniiVision HD3 Series - Ratio; Time Measurements

196 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
14 Measurements
The standard deviation is calculated as follows:
where:
• σ = the standard deviation.
• N = the number of measurements taken.
• x
i
= the ith measurement result.
• x = the mean.
Ratio
The Ratio measurement displays the ratio of the AC RMS voltages of two sources,
expressed in dB. Use the Source 1 and Source 2 drop-down lists to select the source
channels for the measurement.
Time Measurements
The following figure shows time measurement points.
The default lower, middle, and upper measurement thresholds are 10%, 50%, and
90% between Top and Base values. See
"Measurement Thresholds" on page 207
for other percentage threshold and absolute value threshold settings.
•
"Period" on page 197
• "Frequency" on page 197
• "Counter" on page 198
• "+ Width" on page 198
• "– Width" on page 199
• "Burst Width" on page 199
•
"Duty Cycle" on page 199
• "Bit Rate" on page 199
σ =
∑
i=1
N
(
x
i
− x
¯
)
2
N
Rise Time
+ Width
Fall Time
- Width
Period
Middle
Upper
Thresholds
Lower