6
2 Probes
2.1 Probe calibration
The probes delivered with this machine have been compensated and do not need
to be calibrated again. If you use another
new probe
before the first use, it must be
calibrated before it can be used normally, otherwise the measurement will be
inaccurate (only for the 10X/100X). The calibration method is as follows:
1.
Switch the probe to 10X.
2.
Connect the probe to a 1KHz square wave with an amplitude of about 3V. Note
that the square wave must be standard without overshoot.
3.
Adjust the horizontal and vertical scales of the oscilloscope so that the waveform
is displayed stably at a suitable position on the screen.
4.
Use a screwdriver to rotate the adjustable capacitor on the probe until you get the
waveform in the middle of the figure below. The left and right waveforms below
are references for incorrect calibration.
Figure1.1 Probe calibration
2.2
Probe bandwidth
Because the 1X probe has a large input capacitance, the bandwidth of the 1X is
usually within 5MHz; while the bandwidth of the 10X is the standard bandwidth of
the probe.
2.3
Probe withstand voltage
The maximum withstand voltage of the probe is generally marked on the probe,
