R&S RT-Z1M, Manual

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Typical characteristics
R&S
®
RT
‑
Z1M
15 Manual 1801.3142.02 ─ 05
4 Typical characteristics
The R&S RT
‑
Z1M high-impedance buffer amplifier has several gain or attenuation
modes. The mode of the buffer amplifier, and thus the gain or attenuation, depends on
the vertical scale and is set automatically by the oscilloscope to achieve optimized sys-
tem behavior.
4.1 Bandwidth
The R&S RT
‑
Z1M has a bandwidth of 500 MHz. You can reduce the bandwidth to 200
MHz or 20 MHz, see Chapter 3.5.3, "Analog bandwidth" , on page 14. The transfer
functions of the gain or attenuation modes are shown in Figure 4-1 .
The bandwidth of a system specifies the maximum frequency at which a purely sinus-
oidal signal is still transferred at 70
% (–3 dB) of its amplitude.
The bandwidth of the whole measurement setup also depends on the bandwidth of the
probe connected to the R&S
RT
‑
Z1M, and the bandwidth of the oscilloscope.
Figure 4-1: Amplitude/frequency response of the R&S RT
‑
Z1M, all 7 modes
4.2 Step response
The step response up to 20 ns of the R&S RT
‑
Z1M high-impedance buffer amplifier is
shown in Figure 4-2 . The propagation delay is normalized to the beginning of the step.
The amplitude is normalized to the steady state value.
Step response