Bristol 428 - Page 52

Model 428 User’s Manual REMOTE COMMUNICATIONS
Bristol Instruments, Inc. 52
CALCulate2 Subsystem Functions
:DATA?
Description
Queries the frequency spectrum of the input signal.
Query Response
An array of comma separated numerical values in scientific notation.
Examples
:CALC2:DATA? (Note: to accurately recreate the frequency axis see
Appendix F)
:PEXCursion?
Description
Queries the peak excursion value.
Query Response
A single numerical value in dB units
Examples
:CALC2:PEXC?
:PEXCursion
Description
Sets the amount that a peak must rise and fall above the local noise
floor to be identified as a channel. The parameter that is passed is the
desired excursion in dB units.
*RST value
10 dB
Examples
:CALC2:PEXC 15
:PTHReshold?
Description
Queries the value of the channel threshold.
Query Response
A single value in dB (REL) or dBm (ABS) units, dependent on the
:CALC2:THREShold setting
Examples
:CALC2:PTHR?
:PTHReshold
Description
Sets the value of the channel threshold, based on either the tallest peak
in the spectrum (REL) or as an absolute value (ABS).
*RST value
10 dB (REL)
Examples
:CALC2:PTHR 10
:THREShold?
Description
Queries the threshold type
Query Response
{REL | ABS}
Examples
:CALC2:THRES?