7-10
Calibration Commands
SKEW
20 OUTPUT 707;":CALIBRATE:SDONE?"
30 ENTER 707;Selection$
SKEW
Command :CALibrate:SKEW {CHANnel<N>},<skew_value>
This command sets the channel-to-channel skew factor for a channel. The numerical argu-
ment is a real number in seconds which is added to the current time base position to shift the
position of the channel’s data in time. Use this command to compensate for differences in the
electrical lengths of input paths due to cabling and probes. <N> is an integer, from 1 to 4.
<skew_value> is a real number, 0 s to 100
μs.
NOTE In Jitter Mode, skew adjustments are disabled. Do not use this command in Jitter Mode. It generates a “Settings
conflict” error.
Example This example sets the analyzer channel 1 skew to 0.0001 s.
10 OUTPUT 707;":CALIBRATE:SKEW CHANNEL1,0.1s "
Query :CALibrate:SKEW? {CHANnel<N>}
The query returns the current skew value.
Returned Format [:CALibrate:SKEW] <skew_value><NL>
SKEW:AUTO
Command CALibrate:SKEW:AUTO
This command sets the horizontal skew of multiple, active channels with the same bit rate, so
that the waveform crossings align with each other. In addition, auto skew optimizes the
instrument trigger level. Prior to auto skew, at least one channel must display a complete eye
diagram in order to make the initial bit rate measurement.
Mode NRZ Eye mode only.
NOTE In Jitter Mode, skew adjustments are disabled. Do not use this command in Jitter Mode. It generates a “Settings
conflict” error.
NOTE Auto skew uses the current color grade measurement completion criterion (refer to “CGRade:COMPlete” on page
18-13). If auto skew fails to make the bit rate measurement or determine the time of the crossing points needed
to compute the skew, it may be necessary to increase the color grade completion criterion. Increasing the value
will increase the time for auto skew to complete.
Example This example initiates auto skew.
10 OUTPUT 707;":CALIBRATE:SKEW:AUTO "
STATus?
Query :CALibrate:STATus?
This query returns the calibration status of the analyzer. These are nine comma-separated
integers, with 1 or 0. A "1" indicates calibrated; a "0" indicates uncalibrated.
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