Vertical Setups Termination Controls
The following screen appears on MSO/DPO5000 Series instruments:
To use
Click a Channels button to select the vertical input channel.
Click one of the Termination buttons to set the termination for your probe; termination can also be set
during probe compensation.
NOTE. If you are using a probe with a TekProbe/TekVPI inte rface
(see page 491), the termination is
set automatically.
Behavior
The correct termination is set automatically when you attach a probe with a TekProbe interface to the
instrument.
You may need to set the termination manually if you use a probe without the TekProbe Interface. In general:
Select 1 MΩ to use high impedance passive probes (see page 491).
Select 50 Ω to use most active probes (see page 491) and low impedance (Zo) probes (see page 958).
NOTE. On instruments with GND coupling, the 50 Ω termination becomes an open circuit if you set the
channel input coupling to GND.
Consider the following when using 50 Ω termination with any channel:
The instrument does not accurately display frequencies under 200 kHz with AC coupling, if set
to 50 Ω termination.
The instrument reduces the maximum vertical scale setting for the channel to 1 V from 10 V (to
10 V from 100 V with a 10X probe attached), since the amplitudes appropriate for the higher settings
would overload the 50 Ω input.
The instrument switches to 50 Ω and disables AC coupling (and switches coupling to DC if AC is
selected) if you connect an active probe. The active probes also reduce the maximum vertical scale
setting as described above. This behavior results in 50 Ω, non-AC coupling, which is appropriate
for active probes.
What do you want to do next?
Learn m ore about the Vertical controls. (see page 492)
Learn more about the Bandwidth controls. (see page 494)
490 DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series
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