External Sweeps
External sweeps are a special type of sweep in which the Portable One
Plus Access generator does not perform the stimulus changes – they
come directly from the device-under-test, usually from a test tape, test
CD, or remotely located sweep source.
The analyzer expects an externally-applied sinewave signal to change
either upwards or downwards in frequency or amplitude. The signal
may change in discrete steps or in a continuous ‘glide’. If a
gliding-frequency tone is used, it must change no faster than five
seconds per octave (50 seconds for a 20 Hz – 20 kHz sweep).
The Portable One Plus Access will take readings from a number of
points during the sweep and plot them on the graph at the measured
amplitude or frequency.
Printing
The Portable One Plus Access has the ability to print directly to a
printer connected to the external printer port located on the rear panel
of the instrument.
The Portable One Plus Access can print a text output of the current
settings and readings, exact images (or ‘screen dumps) of some
screens, and tabular, hi-resolution, or ‘screen dump’ printouts from
sweep data.
The printer must be compatible with either the Epson/IBM
dot-matrix/ink jet standard or the PCL ink jet/laser jet standard.
Before doing any printing, the correct output format for your printer
must be selected. This selection takes place on the Setup panel. To
get to the Setup Panel, press the PANELS key until you see this screen:
The upper left soft key selects the type of printer output. The choices
are ‘IBM GRAPH’ and ‘PCL GRAPH’.
Figure 4-39. Setup Panel
4
Operation
Controlling the Analyzer : External Sweeps Operation
Portable One Plus Access User's Manual 4-63
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