Spectrum Analyzer Mode
R&S
®
Cable Rider ZPH
178
User Manual 1321.0950.02 ─ 07
If the DUT features some sort of trigger equipment, you can also use an external trig-
ger to trigger measurements.
1. Connect the DUT trigger output to the R&S Cable Rider ZPH trigger input.
2. Press the [SWEEP] key.
3. Select the "Trigger" softkey.
The R&S Cable Rider ZPH opens a submenu to select the trigger setting.
4. Select either the "External Rise" or "External Fall" menu item (rising or falling
edge).
The R&S Cable Rider ZPH activates the trigger and shows the results of the mea-
surement.
It may be that the burst is not completely visible on the display. To correct that and
make the whole burst visible, you can set a trigger delay.
1. Select the "Trigger" softkey.
The R&S Cable Rider ZPH opens a submenu to select the trigger setting.
2. Select the "Trigger Delay" softkey.
The R&S Cable Rider ZPH opens an input field to define the trigger delay.
3. Adjust the trigger delay until the burst is visible inside the vertical lines that show
the measurement range.
8.1.5
Measuring the Adjacent Channel Leakage Ratio (ACLR)
The Adjacent Channel Leakage Ratio (ACLR) measurement is a method to measure
the power over more than one transmission channel and also evaluate the power of
the adjacent (or alternate) channels of the transmission channel. The ACLR performs
measurements according to a specific channel configuration, e.g. a particular radio-
communications standard.
1. Press the [MEAS] key.
2. Select the "Meas Mode" softkey.
The R&S Cable Rider ZPH opens a submenu to select the measurement mode.
3. Select the "ACLR"menu item.
The R&S Cable Rider ZPH starts to measure the adjacent channel leakage ratio.
In principle, the ACLR measurement works like the channel power measurement in
that it determines the spectrum within the channel using a resolution bandwidth that is
small compared to the channel bandwidth. In addition to the channel bandwidth, the
ACLR measurement is also defined by the channel spacing, the bandwidth of adjacent
channels and the adjacent channel spacing.
The R&S Cable Rider ZPH supports measurements on up to 12 carrier channels and
12 adjacent channels to either side of the carrier. When measuring more than one car-
Performing Spectrum Measurements
