Operating Basics
Attach the Reference
Leads Corre ctly
If you are using
all four of the instrument channels, you must attach the probe
reference lead for each channel directly to your circuit. These attachments
are required bec ause the channels are electrically isolated; they do not share a
common chassis connection. Use the shortest possible reference lead with each
probe to maintain good signal fidelity.
The probe reference lead presents a higher capacitive load to the circuit-under-test
than the probe tip. When taking a floating measurement between two nodes of a
circuit, attach the probe reference lead to the lowest impedance or least dynamic
of the two n
odes.
Parasitic capacitance between probes, instrument, and environment. Parasitic
capacitance can occur between the input references and the environment. For this
reason, you should connect the references to a system ground or another stable
voltage. If the reference o f an input is connected to a high speed and/or high
voltage
signal, you should be aware of parasitic capacitance. (See Figure 9.)
Fig
ure 9: Parasitic capacitance between probes, instrument, and environment
THS3000 Series Oscilloscopes User Manual 21
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