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5-5
Reference and Phase Menu
Internal Sweep When the reference source is Internal Sweep, the SR850's
synthesized internal reference is used as the reference
and swept in frequency. Internal frequency sweeps are
linked to the data acquisition scan. The frequency is
changed once per sample (after the trace data is recorded)
and sweeps from the start to stop frequency in one scan
length amount of time. Pausing a scan with the [PAUSE
RESET] key will pause a sweep. Resetting a scan will
reset the frequency to the start frequency.
When using a sweep, it is useful to set the cursor readout
to Fsweep (in the CURSOR SETUP menu). In this mode,
the cursor will read the frequency as the horizontal
coordinate.
Sweep Menu This key displays the internal reference sweep menu
described below. This menu is only available when the ref-
erence source is Internal Sweep.
Sweep Type The frequency sweep can be linear or logarithmic (actually
exponential). Remember, the resolution of the sweep is
determined by the number of samples in the scan, i.e. the
scan length times the sample rate. If the number of sam-
ples is small, the sweep will be very coarse.
Sweep Limits The upper field is the sweep start frequency and the lower
field is the sweep stop frequency. Pressing either key will
select an active entry field. The frequencies may be adjust-
ed using the knob or entered directly with the keypad. The
frequency can be swept in either direction.
Return This key returns to the main Reference Phase menu.
Internal Sweep
Sweep
Menu:
Ref. Source
Sweep Limits
Sweep Type
log
1.0000 kHz
2.0000 kHz
Return:
linear
Start:
Stop: