Technical data

[P]FETCh[:SENSe[1]]:BURSt:TCOunt?
IAgilentN490xEDBurst.ReadTotalCount (not IVI-compliant)
[P]FETCh[:SENSe[1]]:BURSt:TCOunt?
This query returns the Total Burst COunt since the start of the accumulation period.
If Burst mode is OFF, it returns 9.91E+37 (Not-A-Number, NAN).
[P]FETCh[:SENSe[1]]:BURSt:STATe?
IAgilentN490xEDBurst.ReadState (not IVI-compliant)
[P]FETCh[:SENSe[1]]:BURSt:STATe?
This query returns the burst state. While the accumulation period is running, the
burst state always indicates, for example, if the current gate is too long or not.
Thus, if the duty cycle or frequency of the gate signal is changed, the burst state
also changes.
It may be of interest to know if an errored state occurred during a measurement.
For this reason, any errored state is stored even if the warning was only active for
one burst out of thousands.
The following states may be returned:
•
BURST_RESULT_STATE__NO_ERROR
No burst errors have occurred (any of those listed below).
• BURST_RESULT_STATE__GATE_SIGNAL_TOO_LONG
The Gate In signal is too long. This error can occur if there are too many bits
within a burst. The limit is 4Gbit. The length of the Gate In signal therefore
depends on the bit rate.
At 13 Gb/s, this state occurs roughly after 0.3 s (at slower bit rates, this occurs
later). This error has a higher priority than "no unique 48bits".
• BURST_RESULT_STATE__NO_UNIQUE_48BITS_FOUND
For reliable synchronization, a pattern must contain a unique 48-bit pattern (the
detect word). If the current pattern does not have a detect word, this error
occurs.
If this status occurs, the synchronization may be incorrect, as could also the
measured bit error rate. There are standard patterns that may contain more
than one instance of the used detect word. Statistically, every other burst would
be correctly synchronized.
5 SCPI Command Reference
290 Agilent J-BERT N4903B High-Performance Serial BERT
IVI-COM Equivalent
Syntax
Description
IVI-COM Equivalent
Syntax
Description