NF FRA5097, Instruction Manual

Page: 101 / 192

4.10 Frequency axis high density slow sweep
FRA5097 4-27
4.10 Frequency axis high density slow sweep
When measurement data variation is very sharp, you would want to have more correct data in a
short period of time. You can be satisfied by measuring in detail the sharp data portion including
their immediate front and aft portions (high density slow sweep measurement, SLOW SWEEP).
There are two (2) modes in the SLOW SWEEP measurement mode as follows:
・ Auto mode : Sweep density is automatically increased only for the frequency portion with
sharp data variation during sweep measurements.
・ Manual mode : The high density low sweep mode is set “on” or “off” manually during sweep
measurements.
Use the menu [Measure][SLOW SWEEP] window to set the high density slow speed mode.
・ [FUNCTION] : This is set “ON” when the high density slow sweep mode is
used.
・ [SLOW SPEED MODE] : This is used to select MANUAL/AUTO.
・ [CHANNEL] : This is used to select the channel in which to monitor if there is
any sharp data variation in the measurement.
・ [VARIATION] : If measured data are found to vary by more than the amount
specified in [VARIATION], the measurement is done in the high
density slow sweep mode.
The sweep frequency density depends on the following elements: the measured data status of
whether or not there is a sharp data variation, the mode setting status of MANUAL/AUTO and the
function key setting status of [MANUAL ON] or [MANUAL OFF]. See Table 4-8 High density
slow sweep.
Table 4-8 High density slow sweep
Frequency range without sharp data variation Frequency range with sharp frequency variation
Mode
[MANUAL ON] [MANUAL OFF] [MANUAL ON] [MANUAL OFF]
MANUAL
Quadruple
density
Normal density
High density slow
sweep
Normal density
AUTO Normal density High density slow sweep
Normal density : The density that has been set through [Measure][SWEEP FUNCTION]
[SWEEP RESOLUTION].
Quadruple density: Frequency sweep whose frequency density is quadruple of the normal density.
In the high density slow sweep mode of operation, which occurs when a sharp data variation is
detected, the frequency sweep density is automatically increased in the
frequency sweep
measurement until the value set in the [VARIATION] is reached. In the manual mode, the sweep
density returns to normal density, either when the function key [MANUAL OFF] is pressed, or
when the sweep measurement is completed.
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CAUTION
If the value set in [VARIATION] is too low, the sweep density becomes
extremely high and the sweep operation could stop on the way due to the
memory capacity being full. Note that the FRA5097 has the maximum
number of frequency point measurement capacity of 20,000 due to the
memory capacity available.