Using The Buffer Amplifier; Offset Compensation; Ac/Dc Switching - R&S RT-Z1M Manual

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R&S RT‑Z1M

3.5 Using the buffer amplifier

All settings of the R&S RT‑Z1M are adjusted on the oscilloscope.
These settings are:
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Offset
●
Input coupling
●
Lowpass filter (bandwidth)
●
Self-alignment
The gain or attenuation of the buffer amplifier is automatically set by the oscilloscope
depending on the vertical scale.

3.5.1 Offset compensation

The DC offset voltage is subtracted from the signal at the input of the R&S RT‑Z1M.
The offset is part of the vertical settings of the channel to which the buffer amplifier is
connected. For details, refer to the user manual of the oscilloscope.
Figure 3-2: Offset of R&S RT

3.5.2 AC/DC switching

Without the buffer amplifier, the input coupling is limited to "DC" for a 50 Ω input impe-
dance. When the R&S RT‑Z1M high-impedance buffer amplifier is connected to the
channel input, AC coupling is also possible. Note that the R&S ProbeMeter does not
show the correct DC voltage on the probe tip if AC coupling is active.
The coupling is part of the vertical settings of the channel to which the buffer amplifier
is connected. For details, refer to the user manual of the oscilloscope.
Manual 1801.3142.02 ─ 05
‑ Z1M with R&S RT-ZP10, signal range 1V/Div
Putting into operation
Using the buffer amplifier
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