Attach The Reference Leads Correctly; Bnc Connectors; Unterminated Bnc Inputs - Tektronix TPS2000 Series User Manual

Getting Started
WARNING. Do not float the P2220 probes reference lead to >
30 V
RMS
CAT III) or similarly rated, passive, high voltage probe or an
RMS
appropriately rated, high voltage, differential probe when floating
the reference lead above 30 V
voltage probe.
These voltage ratings depend on the probe and your application.
Refer to Specifications on page A- - 1 for more information.
For more information on probe safety, see page 1- - 15.

Attach the Reference Leads Correctly

You must attach the probe reference lead for each channel directly to
your circuit. These attachments are required because the oscilloscope
channels are electrically isolated; they do not share a common
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
nodes.

BNC Connectors

The oscilloscope 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 connec-
tion, make sure your probe or cable connector is pushed on and twist
locked. Replace cables or probes that have worn connectors.

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 a 50 ohm terminator or a BNC shorting
plug to the input BNC connector when establishing a "No Signal"
baseline condition.
1- 6
. Use the P5120 (floatable to 600 V
TPS2000 Series Digital Oscilloscope User Manual
RMS
, subject to the ratings of such high
RMS
CAT II or 300 V