The value for the bottom of the graph is shown in the lower left corner
of the display. To change it, press the lower left soft key to highlight it,
then use the AMPLITUDE controls to adjust the value. Both the top
and bottom values of the graph can be highlighted for simultaneous
adjustment.
The starting and ending values for the swept parameter are shown at
the lower center and lower right of the display. They can also be
adjusted by highlighting them and adjusting the AMPLITUDE or
FREQUENCY controls, depending upon whether the swept parameter
is amplitude or frequency. To change the swept parameter (amplitude
or frequency), highlight one of the endpoints and then press one of the
INC/DEC or ±10dB buttons for the parameter you want to sweep. For
example, if you want to sweep amplitude instead of frequency,
highlight the sweep start frequency and press one of the AMPLITUDE
buttons to sweep amplitude. The units will change to the base
amplitude unit, and you may adjust the starting and ending amplitudes.
The horizontal calibration and step choices will always be logarithmic
unless the ratio of upper limit to lower limit is 3:1 or less, or if the lower
endpoint is zero. In either of these cases it will be linear.
The vertical calibration will be linear for any decibel units (that is, one
dB occupies the same vertical span anywhere on the graph), and for
phase measurements. For non-decibel measurements, the calibration
will be logarithmic unless the value for the graph bottom is chosen as
zero, in which case it will be linear.
The upper center soft key is used to select the number of steps in the
sweep. The normally available choices are 3, 5, 10, 15, 30, 75, or 150
steps, or EXTERNAL. Amplitude sweeps also have a 2 dB choice,
which will step the generator 2 dB for each point. Frequency sweeps
also have a 1/3 OCT choice, which will step to all the ISO-standard 1/3
octave values between the start and end points. Data will always be
taken at the end points, whether or not they are ISO-standard values.
Sweeps of LEVEL do not have the 150 step choice due to memory
limitations. 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 or CD. These special sweeps are discussed in detail on
page 4-63.
4 Operation
Operation Controlling the Analyzer : Sweeps
4-60 Portable One Plus Access User's Manual
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