Waveform setup
R&S
®
RTA4000
61
User Manual 1335.7898.02 ─ 08
Edit Label
Opens on-screen keypad to enter a label text. If you previously have selected a prede-
fined label, it is already written in the entry line, and you can modify it.
The maximum name length is 8 characters, and only ASCII characters provided on the
on-screen keypad can be used.
5.4
Probes
With R&S
RTA4000, you can use various probe types. Mostly these probes are pas-
sive and active voltage probes but also current probes are supported.
The "Probe" menu provides all probe-relevant information. The functionality in the
menu changes according to the type of the attached probe. Probes with
Rohde
&
Schwarz probe interface (probe box) are recognized by the instrument. The
R&S
RTA4000 reads out the main characteristics of the probe and displays them.
Probes that are not recognized automatically require manual setting of measurement
unit and attenuation.
5.4.1
Adjusting passive probes
When using a passive probe, you have to compensate it when you connect it to the
instrument the first time. Compensation matches the probe cable capacitance to the
oscilloscope input capacitance to assure good amplitude accuracy from DC to upper
bandwidth limit frequencies. A poorly compensated probe reduces the performance of
the probe-oscilloscope system and introduces measurement errors resulting in distor-
ted waveforms and inaccurate results.
Two connector pins for compensation are at the front panel. The left pin is on ground
level. The next pin supplies a square wave signal for the adjustment.
1. Press the
[Apps Selection] key.
2. Tap "Probe Adjust".
3. Follow the instructions of the wizard. It guides you through the compensation proc-
ess.
Use the compensation trimmer of the probe to get optimum square wave response.
For details, refer to the documentation of your probe.
Probes
