Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
226
User Manual 1321.0950.02 ─ 07
The R&S Cable Rider ZPH again starts to measure continuously.
8.2.6.3
Working with Trigger Functionality
If you have to perform measurements according to certain signal conditions, you can
use a trigger. A trigger responds to certain events. If a trigger is active, the R&S Cable
Rider ZPH starts to measure if the trigger conditions are met. The trigger can be gener-
ated either externally or internally. The R&S Cable Rider ZPH provides the following
trigger functions.
Selecting the trigger source
1. Press the [SWEEP] key.
2. Select the "Trigger" softkey.
The R&S Cable Rider ZPH opens a submenu to select the trigger source.
3. Select the trigger source you need.
The R&S Cable Rider ZPH activates the trigger.
The R&S Cable Rider ZPH provides the following trigger functions.
●
Free Run
A new sweep starts on completion of the previous sweep. This sweep mode is the
default state of the R&S Cable Rider ZPH.
●
Video Trigger
A sweep starts when the video voltage exceeds a particular level. The video trigger
is available only in the time domain (span = 0).
In the frequency domain, the R&S Cable Rider ZPH would never start a measure-
ment with the video trigger because there is no guarantee that there is a signal that
generates video voltage present at the start frequency.
●
External Trigger
(rising or falling slope)
A sweep starts on the rising edge (RISE) or on the falling edge (FALL) of an exter-
nal trigger signal. The external trigger signal is fed in via the BNC connector "Ext
Trigger". See details of connector in
BNC connector
. The switching threshold is 1.4
V, i.e. a TTL signal level.
●
Gated Trigger
When the gated trigger is active, a gate signal that is applied to the R&S Cable
Rider ZPH trigger input controls the sweep. The R&S Cable Rider ZPH starts mea-
suring when the applied gate signal becomes active and the set gate delay has
expired, and it interrupts the measurement as soon as the defined gate length is
reached. With the gate signal becoming active the next time the measurement is
resumed etc.
Pulsed signals can be measured by this method, if the gate delay and gate length
are selected in a way that the measurement is only performed while the pulse is
active. Gated measurements are possible in the frequency domain (span > 0) and
the time domain (span = 0).
Configuring Spectrum Measurements
