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6) Degaussing and Zero Setting Indicator
After pressing the degaussing / zero button, the indicator light will be green, and after degaussing,
the indicator light will turn off. The buzzer will make two short beeps after successful degaussing.
The buzzer will make an extended beep of about one second if degaussing failed. See 8 below.
7) Range LED Indicator
The green LED indicates the selected range.
8) Degauss / auto zero button
Frequent usage of the T3CP current probe will generate a residual magnetic eld within the
measurement jaw. It is recommended to degauss and auto-zero before a measurement for better
measurement precision. Press the degaussing and auto zero button to trigger the process (should
be around 5s). Remove any DUT from the measurement jaw before degaussing. See 6 above.
9) High / Low Range Selection button
Select the high or low range depending on the measurement being made. Set the oscilloscope
scaling accordingly. See the table below.
10) Power Supply Connection Socket
Connect the supplied external wall socket power supply to the T3CP current probe at this point.
Making Measurements
Before using the probe, check that the preparations described in Safe Probing have been undertaken.
• Inspect the current probe, power supply and cable to ensure that there is no damage. If the
current probe, power supply or cable are damaged please contact Teledyne LeCroy service centre
to arrange repair.
• The output of the current probe is terminated internally. Use the high input impedance 1 MΩ setting
on the oscilloscope’s input when making measurements. Set the oscilloscope’s input coupling to
DC. With the oscilloscope input grounded, adjust the oscilloscope’s trace to the zero position.
Connect the probe’s output BNC connector to the oscilloscope’s input BNC connector using a BNC
to BNC cable. If the oscilloscope input impedance is set to 50Ω, the measurement data will be
incorrect.
Model T3CP30-50 T3CP30-100 T3CP50-50 T3CP150-12 T3CP500-5
Ranges 5A 30A 5A 30A 7.5A 50A 30A 150A 75A 500A
Current
Transfer
Ratio
5A 1V / A 5A 1V / A 7.5A 1V / A 30A 0.1V / A 75A 0.1V / A
30A 0.1V / A 30A 0.1V / A 50A 0.1V / A 150A 0.01V / A 500A 0.01V / A
Oscilloscope
Input Scaling
5A x 1 5A x 1 7.5A x 1 30A x 10 75A x 10
30A x 10 30A x 10 50A x 10 150A x 100 500A x 100
Minimum
Measurable
Current
5A 1mA 5A 1mA 7.5A 1mA 30A 10mA 75A 10mA
30A 10mA 30A 10mA 50A 10mA 150A 100mA 500A 100mA
