Getting Started 1
Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide 43
17. Analog channel
inputs
Attach oscilloscope probes or BNC cables to these BNC connectors.
With the InfiniiVision 3000T X-Series oscilloscopes, you can set the input impedance of the
analog channels to either 50 Ω or 1 MΩ. See “To specify channel input impedance" on
page 82.
The InfiniiVision 3000T X-Series oscilloscopes also provide the 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.
18. Demo 2, Ground, and
Demo 1 terminals
• Demo 2 terminal — After a [Default Setup], this terminal outputs the Probe Comp signal
which helps you match a probe's input capacitance to the oscilloscope channel to which it
is connected. See “Compensate Passive Probes" on page 36. With certain licensed
features, the oscilloscope can also output demo or training signals on this terminal.
• Ground terminal — Use the ground terminal for oscilloscope probes connected to the Demo
1 or Demo 2 terminals.
• Demo 1 terminal — The oscilloscope can output training signals on this and the Demo 2
terminal. See: [Help] > Training Signals > Training Signals.
19. USB Host port This port is for connecting a USB mass storage device, printer, mouse, or keyboard to the
oscilloscope.
Connect a USB compliant mass storage device (flash drive, disk drive, etc.) to save or recall
oscilloscope setup files and reference waveforms or to save data and screen images. See
Chapter 20, “Save/Email/Recall (Setups, Screens, Data),” starting on page 321.
To print, connect a USB compliant printer. For more information about printing see
Chapter 21, “Print (Screens),” starting on page 335.
You can also use the USB port to update the oscilloscope's system software when updates are
available.
You do not need to take special precautions before removing the USB mass storage device
from the oscilloscope (you do not need to "eject" it). Simply unplug the USB mass storage
device from the oscilloscope when the file operation is complete.
CAUTION: Do not connect a host computer to the oscilloscope's USB host port. Use the
device port. A host computer sees the oscilloscope as a device, so connect the host computer
to the oscilloscope's device port (on the rear panel). See “I/O Interface Settings" on
page 341.
There is a second USB host port on the back panel.
20. Digital channel
inputs
Connect the digital probe cable to this connector (MSO models only). See Chapter 7, “Digital
Channels,” starting on page 131.
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