RIGOL
PHA User Guide
9
Precautions During Measurement
CAUTION
1. Before measurement, try to twist the high-voltage differential input cables as
much as possible, which can better reduce the interference of the lead
inductance and external noise to improve the anti-interference ability of the
probe. The twisting method is shown in the figure below:
Figure 2 Twisting the High-Voltage Differential Input Cable
2. Try not to extend the input cable, as this will bring more noises. If you have
to extend the cable, extend the cable with the same length. Besides, the
input frequency should not be greater than 5 MHz. Otherwise, errors will
occur for the output, as shown in the figure below.
Figure 3 Waveforms Generated without Extending the Input Cable
