Degaussing and balancing adjustment steps for oscilloscope current probes

　　The current probe is a wire that connects the circuit under test and the input end of the electronic oscilloscope. A complex probe is composed of a resistor-capacitor component and an active device. A simple probe without shielding measures is easily interfered by external electromagnetic fields, and its equivalent capacitance is relatively small. Large, causing the load of the circuit under test to increase and distorting the signal under test.

　　To make measurements, you must frequently degauss and balance the probe. Degaussing can eliminate the parasitic magnetic field in the probe core, otherwise it will cause zero point drift and measurement errors. After each degaussing, the zero point balance of the probe needs to be adjusted to eliminate the existing offset. The editor of Puke Technology will introduce to you the need for degaussing and balancing under the following conditions:

　　1. Each time you turn on the oscilloscope and warm it up for 20 minutes;

　　2. Whenever overload occurs;

　　3. Whenever the probe is exposed to a strong magnetic field;

　　4. Every time the no-load DC bias is found to be non-zero.

　　Current probe degaussing and balance adjustment steps:

　　1. Set the oscilloscope input channel to the zero reference point.

　　2. Connect the output of the probe to the oscilloscope. If it is a TCPA series or TCP202 current probe, and use an oscilloscope of Tektronix TDS3000 or above, the oscilloscope will display the channel!

　　3. Set the scale to amperes/division.

　　4. Without clamping any wires on the probe, push the slider to the bottom until CLOSED is displayed.

　　5. Press the DEGAUSS button.

　　6. Set the oscilloscope to a small scale, such as 1mA/div or 10mA/div. Adjust the balance knob until the waveform trajectory line coincides with the zero point.

　　Precautions:

　　1. Please read the safety precautions and probe range in the instruction manual carefully;

　　2. For clamp-on current probes, the slider must be pushed to the bottom until the probe displays: "CLOSED";

　　3. The probe needs to be degaussed after each measurement to avoid the impact of residual magnetism on the measurement results;

　　4. The active current probe needs to be preheated for more than 20 minutes before each measurement to ensure accurate measurement results;

　　5. If higher measurement accuracy is required, please use Tektronix's dedicated current calibration fixture for calibration before each use;

　　6. Pay attention to the direction of current flow.