Specifications
5-36
System Command Reference Section
Error Detector Measurement Functions
Error Detector Measurement Functions
The FETCh|PFETch command is used to return measurement values from the error
detector. The FETCh command returns the results for the current gating period, and the
PFETch (Previous FETch) returns the results for the previous gating period. The
PFETch command is valid only in Repetitive Timed gating periods.
If any result is not available, then the number 9.91 x E+37 (Not-A-Number, NAN) will be
returned.
Interpretation of the results obtained using query commands of gated results in this section
should take account of the gating parameters configured by means of the commands given
in Error Detector Measurement Gating on page 5-32.
The FETCH[:SENSe[1]] query commands apply to measurements on the data input. The
FETCH:SENSe2 query commands apply to measurements on the clock input.
FETCH[:SENSe[1]]:ECOunt
This is a contraction of the phrase Error COUnt and returns the number of errors counted
in a time specified by the next level in the command. The next level is:
[:ALL][:FULL][:TOTal]? <NR3> The total number of errors accumulated since the start
of the gating period.
[:ALL][:FULL]:DELTa? <NR3> The number of errors in the last decisecond. This is
intended to give a result that corresponds to the
“instantaneous” error count. This value is available
even when gating is turned off.
:ZASone[:TOTal]? <NR3> This is a contraction of the phrase Zero received AS
One. The command returns the number of errors
accumulated since the start of the gating period, where
each error is a true data zero received as a data one.
[:ALL] BIT [:TOTal]? <NR3> The total number of errors accumulated on the
currently selected bit since the start of the gating
period.
[:ALL] BIT:DELTa? <NR3> The number of errors accumulated in the last
decisecond on the currently configured “BIT Error
address”.
:OASZero[:TOTal]? <NR3> This is a contraction of the phrase One received AS
Zero. The command returns the number of errors
accumulated since the start of the gating period, where
each error is a true data one received as a data zero.