Probe Compensation And Correction; Automatic Settings Of Waveform Display; Correct Compensation - Tenma 72-2650 Operating Manual

steps:
1. Set the probe menu attenuation coefficient as 10×,
place the switch on the probe at 10× and connect the DSO
probe with CH1. Connect the probe end and signal
output connector to the probe compensator, the ground
clamp and ground lead connector of the probe
compensator, turn on CH1 and press AUTO .
2. Observe displayed waveform
Over-
Correct
compensation
compensation
Figure 1-8a Probe Compensation and Correction
If the screen displays "under-compensation" or "over-compensation"
for waveform as shown in the above figures, use a screwdriver
with a nonmetal handle to adjust the variable capacitance
on the probe until the screen displays "correct compensation"
for the waveform as shown in the below figure.
8
72-2650/72-10510/72-8225A /72-8705A/72-8710A user manual
Warning: In order to avoid electric shock when
measuring high voltage with the probe, please ensure that
the insulation lead of the probe is in good condition and
do not touch the metal part of the probe when
connected to a high voltage power supply.
Under-
compensation

1.5 Automatic Settings of Waveform Display

72-2650/72-10510/72-8225A /72-8705A/72-8710A
DSO has automatic setting function. According to input
signals, the DSO automatically adjusts the vertical
deflection factor, scanning time base and trigger mode
until the most appropriate waveform is displayed.
To apply the automatic setting, the frequency of the measured
signal is required to be ≥ 50Hz and the duty ratio is > 1%.
Figure1-8b:Correct compensation