How to set up the oscilloscope when using a universal current probe

　　The current probe is compatible with most oscilloscopes on the market.

　　In order to measure the current accurately and conveniently, the parameters of the oscilloscope need to be set. This article takes the three most common oscilloscope brands on the market: Tektronix, KEYSIGHT, and LeCroy as examples to explain the parameter settings when using the commonly used high-frequency current probes CP8030B/H and CP8150A.

　　The coupling mode and impedance of the oscilloscope are set to: DC 1MΩ; the current probe has converted the measured current into a voltage for output, and the default oscilloscope impedance is 1MΩ. If the impedance is mistakenly set to 50Ω, the signal will be half as small.

　　Tektronix MDO3032

　　KEYSIGHT DSOX2012A

　　(Note: This model of KEYSIGHT oscilloscope does not have 50Ω option, so the default is 1MΩ)

　　LeCroy 62Xs

　　Oscilloscope attenuation ratio settings

　　According to the probe used and its transmission ratio, by correctly setting the attenuation ratio of the oscilloscope, the user can directly read the current value on the oscilloscope without manual conversion (the displayed unit is still V).

　　The following takes the CP8030B/H and CP8150A probes as examples:

　　CP8030B/H is divided into two ranges: 30A and 5A:

　　30A range, probe current transmission ratio is: 0.1V/A; when using this range for measurement, the oscilloscope attenuation ratio should be set to "÷10", "10X" or "10:1" as shown below:

　　Tektronix MDO3032

　　KEYSIGHT DSOX2012A

　　LeCroy 62Xs

　　5A range, probe current transmission ratio is: 1V/A, oscilloscope attenuation ratio should be set to "÷1", "1:1" or "1X" as shown below:

　　Tektronix MDO3032

　　KEYSIGHT DSOX2012A

　　LeCroy 62Xs

　　CP8150A is divided into two ranges: 150A and 30A:

　　150A range, transmission ratio: 0.01V/A; when measuring, the oscilloscope attenuation is set to "÷100", "100: 1" or "100X" as shown below:

　　Tektronix MDO3032

　　KEYSIGHT DSOX2012A

　　LeCroy 62Xs

　　30A range, probe current transmission ratio is: 0.1V/A; when using this range for measurement, the oscilloscope attenuation ratio should be set to "÷10", "10X" or "10:1", the setting method is the same as CP8030B/H 30A range The gears are the same.