All ofthe numerical step choices count the number ofsteps ofthe
swept parameter, not the number ofdata points on the graph. The
number ofdata points will always be one more than the number of
steps.
For all step types except EXTERNAL, the upper right soft key selects
the speed ofthe sweep. The choices are FAST, MEDIUM, and SLOW.
FAST is the appropriate choice when testing devices without significant
delay between the input and output. Amplifiers, mixing consoles, and
equalizers are examples ofdevices that can generally be tested in
FAST mode. Ifthe input-to-output delay is more than about 200 ms,
FAST mode should not be used.
MEDIUM sweep speed inserts a time delay ofapproximately 0.9 sec
after changing the generator setting, before the analyzer begins taking
data. Its principal intent is for use on a Portable One Plus Access
generator feeding an audio transmission link while the analyzer section
ofanother Portable makes EXTERNAL sweep measurements at the
receiving end. It can also be used for devices with a moderate delay,
such as a satellite relay or an analog tape recorder with a moderate
amount ofdelay between the record and reproduce heads, or for
recording test tapes for external response measurements.
SLOW sweep speed inserts a minimum delay ofthree seconds after
changing the generator setting before the analyzer begins taking data.
This can be used for very slow transmission links or analog tape
recorders with long delays between recording and reproducing heads.
It is also important for external measurements that require automatic
tuning ofthe tunable filter (XTALK and THD+N in autotuning mode)
before obtaining a valid reading, because extra time must be taken for
the frequency reading and filter tuning. It is also intended for
recording test tapes for external XTALK and THD+N measurements.
The SLOW setting is always the most reliable; ifyou are unsure ofthe
time required by your device and measurement, start with SLOW
sweep speed. Assuming the data is reasonable, bump the speed up to
MEDIUM and compare. Ifthe data is approximately the same, you
may step up to MEDIUM, and may also want to try FAST.
4
Oper
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Controlling the Analyzer : Sweeps
Operation
Portable One Plus Access User's Manual
4-61
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