2 Probing the Device Under Test
52 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Analog Input Impedance (50 Ohm or 1 MOhm)
The input impedance of most InfiniiVision oscilloscope analog channels
can be set to either 50 or 1 M . The 50 mode matches 50 cables
and many active probes commonly used in making high frequency
measurements. This impedance matching gives you the most accurate
measurements because reflections are minimized along the signal path.
The 1 M impedance is commonly required for use with most passive
probes.
If you would like to connect to the oscilloscope using 50 ohm BNC cables
instead, select the 50 ohm input impedance mode.
For instructions on setting the input impedance, see “To specify channel
input impedance” on page 79.
For more information on probing, visit
www.agilent.com/find/scope_probes
Information about selecting a probe can be found in document number
5989- 6162EN: Agilent Oscilloscope Probes and Accessories Selection
Guide, available at www.agilent.com.
AutoProbe Interface
The AutoProbe interface uses a series of contacts directly below the
channel’s BNC connector to transfer information between the oscilloscope
and the probe. When you connect a compatible probe to the oscilloscope,
the AutoProbe interface determines the type of probe and sets the
oscilloscope’s parameters (units, offset, attenuation, coupling, and
impedance) accordingly.
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