Making Measurements - Teledyne T3CP30-50 Manual

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 field 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.
Model T3CP30-50
Ranges 5A 30A
5A 1V / A
Current
Transfer
Ratio
30A 0.1V / A
5A x 1
Oscilloscope
Input Scaling
30A x 10
5A 1mA
Minimum
Measurable
Current
30A 10mA
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.
Page 5
T3CP30-100 T3CP50-50
5A 30A 7.5A
5A 1V / A 7.5A
30A 0.1V / A 50A
5A x 1 7.5A
30A x 10 50A
5A 1mA 7.5A
30A 10mA 50A
T3CP150-12
50A 30A 150A
1V / A 30A 0.1V / A
0.1V / A 150A 0.01V / A
x 1 30A x 10
x 10 150A x 100
1mA 30A 10mA
10mA 150A 100mA
T3CP500-5
75A 500A
75A 0.1V / A
500A 0.01V / A
75A x 10
500A x 100
75A 10mA
500A 100mA