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5-6
BPS
The 2251A will remain the Fall Time (FT) mode with a header of FT
and Channels A and B will have a negative slope enabled.
Phase Measurement
Phase measurement on the 2251A is a sequence of functions and is accomplished by
measuring the time interval between the two signals and calculating the phase as a function
of the total Period. This complex measurement is implemented as a series of three
measurements: a Ratio A/B or (B/A) to determine if the signals are the same frequency, a
Period measurement to determine the period of the reference signal and a Time Interval
measurement to determine the time difference between the two signals. The Time Interval
is then divided by the Period and the result multiplied by 360 to scale the answer for degrees.
(Refer to Figure 5-3.)
Figure 5-3 Phase Measurement
The default settings for the 2251A in the Phase mode are:
COMMAND
Parameter Set
PH
RA/PA/TI The function is a sequential setting of functions which are
not programmable or changeable by the user.
AMN
Manual trigger, Channel A. Channel A auto-trigger (AAU) can be
programmed.
BMN
Manual trigger, Channel B. Channel B auto-trigger (BAU) can be
programmed.
AAD
X1 attenuator, Channel A. The X1 attenuator is set by default in the
manual trigger mode. The X10 attenuator can be set if the signal is
larger than 5 V or larger than ±5 V. The attenuator setting will be
p-p
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Содержание 2251A
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