2-46
Making Measurements
Advanced Features
12 Some measurement results may be displayed as ---- due, for example, to
mobilefailure. The measurement has been armed but has not completed. In these
circumstances a GPIB query of the measurement will not return a result. This
event should be catered for by adding a time-out to the query and a “CLEAR”
operation as described in paragraph 11, above.
13 Whenchanging between screens, the DSP results may briefly show a very large
number. This is expected behavior.
When controlling the instrument via GPIB, some phase and frequency results
may consistently return a very large number. This is most likely caused by
attemptingto read result from another DSP screen when measurement triggering
is set toContinuous . The alternative solutions are either to change to the
appropriate DSP screen before reading the result, or to use single-shot
measurement triggering.