Operating Basics
Input Connect
ions
The top panel of the instrument has four safety BNC jack signal inputs. The color
at the b ase of eac h BNC input corresponds to the color of the relat ed channel
buttononth
e front panel. Isolated input architecture allows independent floating
measurements with each input. (See Figure 6.)
NOTE. Read the important safety information about taking floating measurements.
(See page 18.)
BNC Connectors
The instrument BNC reference connection is made on the inside of the BNC
connector. The black bayonet on the outside of the BNC connectors does not
provide electrical contact. For a good connection, make sure your probe or cable
connector is pushed on and twist locked. Replace cables or probes that have
worn co
nnectors.
Unterminated BNC Inputs
The black bayonet on the outside of the BNC input connectors does not shield
the connector input from unwanted electrical noise from nearby circuits. Connect
a50Ω
terminator or a BNC shorting plug to the input BNC connector when
establishing a “No Signal” baseline condition.
Figure 6: Top panel input connectors
THS3000 Series Oscilloscopes User Manual 17
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