Operation
Publication 21555, Rev. E, September 2002
2-33
2.5.18.3
Triggering Notes
Refer to Instrument Triggering in Section 2.5.14 for more information.
EXT triggering is performed with the front panel BNC connector and will work only in BURSt and
SWIFt Modes. EXT triggering is not available in NORMal Mode. Provision has been made for a
hardware ready type handshaking capability using the analog output. This feature can be used as a loop
back test when performing troubleshooting procedures.
BUS triggering is available for all operating modes, BURSt, SWIFt and NORMal.
IMMediate triggering is not compatible with BURSt and SWIFt Modes. If sending the CALC#:MODE
BURS command to enter the BURSt Mode, IMM instrument triggering for NORMal Mode will
automatically be switched to TRIG:SOUR BUS. If using the CALC#:MODE SWIF command to enter
the SWIFt Mode, IMM instrument triggering will remain IMM, but a device-specific error will be
generated whenever specifying a TRIG:COUN # higher than 1. Using the FETCh#? measurement
query, taking accurate measurements can be done anyway; do not set TRIG:COUN.
Using FETCh#? when having time-dependent measurement processes can be a little tricky unless using
SRQs. If the 58542 has not had enough time to process the measurement or has not received a trigger, it
will return an abnormally large number — 9.e40 is common, but other obviously invalid readings can
occur. Not using SRQs is fastest for measurement speed, manage the measurement/triggering timing
problem closely.
2.5.18.4
Measurement Level Notes
The SWIFt Mode should not be used for measuring power in the bottom 10 dB of the CW dynamic
range. At low power levels, the NORMal mode reduces the measurement speed to account for the
effects of noise.
Example programs for High Speed Measurements are contained in Appendix A.
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