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Making Measurements
• Ensure that the probe is being used within its input operating range. Use of the probe outside of its
operating range may result in damage to the probe.
• Connect the power supply to the probe, or install a 9V battery in the probe and turn the probe on, the
power indicator light should glow.
• Connect the output BNC connector of the probe to the input BNC connector on the oscilloscope using
the supplied BNC to BNC cable.
• Set the oscilloscope input impedance to 1MΩ.
• Set the oscilloscope’s input coupling to DC and channel attenuation ratio to 10:1 or 100:1 for correct
scaling depending on the T3CP100-2 range being used. For the L range set the oscilloscope
attenuation ratio to 10:1, for the H range set the oscilloscope attenuation ratio to 100:1.
• With the probe measurement jaw closed, use the Auto Zero button to degauss and auto zero the
probe. The auto zero light will glow during the auto zero process and a buzzer will sound two beeps. If
only a single beep is heard then the auto zero process has failed. Note that a 30 minute warm up time
is required before using Auto Zero and making measurements. This is the probe’s measurement warm
up time and improves measurement accuracy.
• Connect the probe to the circuit under test to make measurements. Note that the probe is directional as
indicated on the current probe head. The probe should be kept away from high voltage pulse circuits
and stray magnetic fields to minimize interference.
• After the test remove the probe measurement jaw from the circuit under test.
• Since the probe has a 2 MHz bandwidth it is recommended to turn on a bandwidth limit filter on the
Oscilloscope if it has one.
Safe Probing
This device is designed to comply with Safety Standards and has been thoroughly tested for safety prior
to shipment. However, mishandling during use could result in injury or death, as well as damage to the
device. Be certain that you understand the instructions and precautions in the manual before use. We
disclaim any responsibility for accidents or injuries not resulting directly from device defects.
To avoid short circuits and potentially life-threatening hazards, follow these warnings and precautions:
• Never attach the probe to a circuit that operates over the maximum rated current or voltage to earth.
• While connected to, and measuring, a live circuit do not touch the current probe clamp jaw or the
conductor being measured.
• Be careful to avoid damaging the DUT conductor insulation while taking measurements.
• Make sure that the oscilloscope connected to this device's output BNC connector is equipped with
protective earthing with double-insulation construction.
• Do not allow the T3CP probe to get wet, and do not take measurements with wet hands. This may
cause an electric shock.
• Read and observe all warnings and precautions relating to electrical safety for the measuring instrument
(typically an oscilloscope) being connected to the probe.
•Do not store or use the probe where it could be exposed to direct sunlight, high temperature, humidity,
or condensation. Under such conditions, the probe may be damaged and insulation may deteriorate so
that it no longer meets specifications.
