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The following screen appears on MSO/DPO5000B 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 interface, 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.

■

Select 50 Ω to use most active probes and low impedance (Zo) probes.

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 more about the Vertical controls.

Learn more about the Bandwidth controls.

TekProbe/TekVPI Interface

This interface enables the instrument to sense information about the probe such as the serial number and other unique

identification information. It also allows the instrument to provide power directly to the probe.

With this information, the instrument can automatically set up its requirements to match the characteristics of the probe, such as

termination and attenuation.

High Impedance Probes

Most general-purpose probes have high input impedance.

Vertical setups

DPO70000SX, MSO/DPO70000DX, MSO/DPO70000C, DPO7000C, and MSO/DPO5000B Series 489

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