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Termination
To Use
Use the Termination controls to select the channel input resistance (50 Ω or
1 MΩ). 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
The 50 Ω termination becomes an open circuit if you set the channel input coupling to GND.
Behavior
The correct termination is set automatically when you attach a probe with a TekProbe interface to
the instrument. However, you may have to set the termination manually if you use a probe without
a TekProbe Interface.
Consider the following when using 50 Ω termination with any channel:
 The instrument does not accurately display frequencies under 200 kHz with AC coupling.
 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 X10 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, nonAC coupling,
which is appropriate for active probes.
Use the front-panel button for each vertical input channel to manually select the termination.
Channel Invert
To Use
Use the Invert button to toggle inversion of the selected channel
waveform.
Behavior
When Invert is On, the selected waveform appears mathematically inverted (flipped) on the zero
volt axis. No trace of the normal waveform is left on the screen. Set Invert to Off to view the
normal waveform.
An inverted channel waveform can be used for math or measurement functions. But if used as a
trigger source, the normal, not inverted, waveform is used.
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