Rohde & Schwarz ESRP Series, User Manual

Page: 311 / 1094

Spectrum Measurements
R&S
®
ESRP
308 User Manual 1175.7445.02 ─ 08
Deltamarker 3, on the other hand, can be moved for fine adjustment irrespective of
marker 2.
Marker 1 can also be moved manually for re-adjustment without affecting the position
of the deltamarkers.
For general information on measuring the AM modulation depth see Chapter 6.1.1.11,
"Measuring the AM Modulation Depth" , on page 307.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:MDEPth[:STATe]
on page 753
CALCulate<n>:MARKer<m>:FUNCtion:MDEPth:RESult?
on page 752
Marker 1 / Marker 2 / Marker 3 / … Marker 16,/ Marker Norm/Delta ← AM Mod
Depth
The "Marker X" softkey activates the corresponding marker and opens an edit dialog
box to enter a value for the marker to be set to. Pressing the softkey again deactivates
the selected marker.
If a marker value is changed using the rotary knob, the step size is defined via the
Stepsize Standard or Stepsize Sweep Points softkeys.
Marker 1 is always the reference marker for relative measurements. If activated, mark-
ers 2 to 16 are delta markers that refer to marker 1. These markers can be converted
into markers with absolute value display using the "Marker Norm/Delta" softkey. If
marker 1 is the active marker, pressing the "Marker Norm/Delta" softkey switches on
an additional delta marker.
Remote command:
CALCulate<n>:MARKer<m>[:STATe]
on page 663
CALCulate<n>:MARKer<m>:X
on page 664
CALCulate<n>:MARKer<m>:Y
on page 664
CALCulate<n>:DELTamarker<m>[:STATe]
on page 669
CALCulate<n>:DELTamarker<m>:X
on page 670
CALCulate<n>:DELTamarker<m>:X:RELative?
on page 671
CALCulate<n>:DELTamarker<m>:Y
on page 671
Search Signals ← AM Mod Depth
Activates all markers.
Remote command:
CALCulate<n>:MARKer<m>:FUNCtion:MDEPth:SEARchsignal ONCE
on page 752
6.1.1.12 Measuring Harmonic Distortion
The harmonics and their distortion can be measured using the "Harmonic Distortion"
on page 201 function.
With this measurement it is possible to measure the harmonics e.g. from a VCO easily.
In addition the THD (total harmonic distortion) is calculated in % and dB.
With span > 0 Hz, an automatic search for the first harmonic is carried out within the
set frequency range. Also the level is adjusted. In zero span, the center frequency is
unchanged.
Measurements