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FRAX User's Manual
© 2011 Megger Sweden AB
4.3.3 Measurement Settings... (Ctrl+M)
The default measurement settings are specified in this dialog. All new measurement sweeps
except sweeps based on "Use Measurement as Template" will have these settings initially.
A measurement sweep can consist of one or more (max 15) measurement bands with different
settings. Normally the frequency settings are set in such a way that the next band continues
the previous band. The first screen shot below shows the default setting, the second screen
shot below shows a three band setting.
"Start Frequency" and "Stop Frequency" of the sweep, or of the band if several bands are
used.
"P / D": In logarithmic scale, "Points / Decade" (P / D) is the number of measurement points,
equally spaced in a logarithmic scale, per decade. Example: 200 "P / D" between 10 Hz to 1000
Hz gives 400 measurement points logarithmic distributed between 10 Hz to 1000 Hz (two
decades). In linear scale, "P / D" is the total number of measurement points, linearly
distributed. Example: 200 P / D from 10 Hz to 1000 Hz gives 200 measurement points linearly
distributed. Less than 10 P / D is not recommended.
"Min skip time" and "Min skip cycles" defines the number of cycles applied before
measurement starts. "Min time" and Min cycles" defines the number of cycles in
measurement. Example: A measurement is performed at 100 Hz, "Min time" = 0.1s and "Min
cycles" = 12. Since 12 cycles is greater than 10 cycles = 0.1s the system measures at 100 Hz
using 12 cycles. Same settings at 1000 Hz means that the system measures 100 cycles since 0.1s
= 100 cycles is greater than 12 cycles. Note! Min Cycles = 12 equals an IF Bandwidth of 10%.
The default sweep settings are as below.
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