Getting Started 1
6000 Series Oscilloscope User’s Guide 51
To connect the oscilloscope probes
The analog input impedance of the 100 MHz oscilloscopes is
fixed at 1MΩ. The 1 MΩ mode is for use with many passive
probes and for general purpose measurements. The high
impedance minimizes the loading effect of the oscilloscope on
the circuit under test. If a 50Ω input impedance is required,
attach a 50 ohm feedthrough termination adapter such as
Agilent part number 0960-0301 to the oscilloscope’s channel
input BNC connector.
The analog input impedance of the 300MHz, 500 MHz, and
1 GHz oscilloscopes can be set to either 50 Ω or 1 MΩ. The 50 Ω
mode matches 50 Ω cables and some active probes commonly
used in making high frequency measurements. This impedance
matching gives you the most accurate measurements since
reflections are minimized along the signal path.
1Connect the supplied oscilloscope probe to an oscilloscope
channel BNC connector on the front panel of the
oscilloscope.
2Connect the retractable hook tip on the probe tip to the
circuit point of interest. Be sure to connect the probe ground
lead to a ground point on the circuit.
CAUTION Maximum input voltage in 50Ω mode
Do not exceed 5 Vrms at the BNC in 50Ω mode on the Agilent 6000
Series oscilloscopes. Input protection is enabled in 50Ω mode and the
50Ω load will disconnect if greater than 5 Vrms is detected. However
the inputs could still be damaged, depending on the time constant of
the signal. The 50Ω input protection mode on the Agilent 6000 Series
oscilloscopes only functions when the oscilloscope is powered on.
CAUTION The probe ground lead is connected to the oscilloscope chassis and
the ground wire in the power cord. If you need to measure between
two live points, use a differential probe. Defeating the ground
connection and “floating” the oscilloscope chassis will probably result
in inaccurate measurements.