-SCS Parameter Analyzer Reference Manual Section 5: Pulse measure and pulse generator
4200A-901-01 Rev. C / February 2017 5-5
Average pulses
For pulse I-V (spot mean), the mean values of two or more pulses are averaged. Think of it as the
"mean of the means."
For waveform capture, each acquired reading is a mean average of the corresponding samples for all
the pulses in the burst.
See Spot mean average readings (on page 5-71) for details on the average pulses measure mode
for pulse I-V. For UTM programming, the average pulse measure mode is called spot mean average.
The pulse_meas_sm (on page 13-108) function is used to select the average acquisition type.
See Waveform average readings (on page 5-73) for details on the average pulses measure mode for
waveform capture. For UTM programming, the average pulses measure mode is called waveform
discrete. The pulse_meas_wfm (on page 13-111) function is used to select the average acquisition
type.
Sample rate
For the PMU, the maximum measurement sampling rate for each A/D test is 200e6 (200 million)
samples per second. However, there is a limit to the number of samples (one million) that can be
acquired per A/D test. When a test is configured to exceed that limit, the sample rate is automatically
lowered when using ITMs so that less than one million samples will be acquired.
Pulse I-V (spot mean)
The maximum number of samples per A/D per test is <1,000,000 (one million). If an ITM is configured
to yield more than one million samples, Clarius automatically lowers the sampling rate. For pulse I-V
(spot mean), typically the sample rate is reduced only if the measure window is wide (due to a wide
pulse width or period) or if the number of pulses is large.
The total number of samples for a test is calculated as follows:
Number of samples = Measure window x Sample rate x Number of pulses x Sweep points x Step
points
Example: Test that uses a single PMU to perform 50 20-step sweeps
Pulse width = ~7 µs
Measure window = 1 µs
Sample rate = 200e6 samples per second
Number of pulses = 50
Number of steps in sweep = 20
The number of samples acquired for the above example is calculated as follows:
Number of samples = 1 µs x 200e6 x 50 x 20 = 200,000
Because the number of samples is less than the one million sample limit, the sample rate of 200e6
samples per second is used for the above example.
To Next Page
Loading...
Need help?
General
