Rohde & Schwarz R&S UPP, User Manual

Page: 368 / 938

Instrument Functions
R&S
®
UPP
352 User Manual 1411.1055.32 ─ 10
If the present stop value is entered as the start value, the sweep direction is automati-
cally reversed and the stop value is given the old start value.
Remote command:
ARM:FREQuency:STARt
on page 735
ARM:VOLTage:STARt
on page 736
Stop
This is used to enter the stop value for the recording interval (in the case of external
sweeps) or for the trigger range (in the case of level triggering).
The stop value should be set to the expected full-scale value of the external sweep.
If the stop value is less than the start value, the external sweep runs as a downward
sweep; in the case of edge triggering the system awaits a negative edge.
If the present start value is entered as the stop value, the sweep direction is automati-
cally reversed and the start value is given the old stop value.
Termination condition:
For a scan to terminate correctly, the last measured value must exceed the specified
stop value or approach it by less than the specified "variation" from the end value.
Note: Multiscan mode:
It must be ensured that the termination condition is met to ensure that all scans are
stored.
Remote command:
ARM:FREQuency:STOP
on page 735
ARM:VOLTage:STOP
on page 736
Variation
For entering the relative change of frequency or level in the form of a percentage with
effect from which a new measurement is triggered in the case of external sweeps. For
external level sweeps the value can also be entered in dB.
The variation chosen should be some 5% to 10% smaller than the expected changes,
so that on the one hand triggering will occur reliably and on the other hand will not
occur on intermediate values.
The entered value is used to calculate the internal variation factor
●
For upward sweeps: 1 + var/100
●
For downward sweeps: 1 – var/100
Note: Due to the different variation factors for upward and downward sweeps, the
number of sweep points in an upward sweep - given identical values for "Start", "Stop"
and "Variation" - is somewhat greater than in a downward sweep.
In the case of continuous sweeps, a change by at least this value in the stop to start
direction (i.e. counter to the sweep direction) causes measured value recording to
restart.
External Sweeps and Level-Controlled Measured value Triggering