7
which is usually 600V(dc+ac).
2.4 Use tips
2.4.1 Large input capacitance
Because the probe 1X has a large input capacitance (usually more than 100 pf), it
is not suitable for measuring some capacitively sensitive circuits. For example, when
measuring a passive crystal of MCU, the large capacitor may cause the crystal to fail
to vibrate. As for the output of a high-speed op amp, a capacitive load may cause the
op amp to overshoot or oscillate. For circuits with large capacitances that are not
suitable for measurement, please use 10X. The input capacitance of the 10X is usually
several pf.
2.4.2 Measuring high voltage
The oscilloscope's measurement voltage range is -40V ~ + 40V (80Vpp). Please
use the 10X probe to attenuate the signal by 10 times beyond this range. The
measurable voltage range of 10X range is 600V(DC+AC). Please note that you must
first switch the probe to the 10X position before connecting the high voltage signal,
otherwise the high voltage may break down the internal circuit of the oscilloscope
。
2.4.3 High bandwidth
Because the 1X probe has a large input capacitance, the bandwidth of the probe
1X is usually within 5MHz, so please use the 10X position when the measured signal
bandwidth is greater than 5M.
Summary
:
10X is usually used in most applications.
3
Vertical system
3.1
Vertical sensitivity
Oscilloscope vertical sensitivity refers to the voltage represented by a grid in the
vertical direction of the screen. There are 8 divisions in the vertical direction of the
oscilloscope. You can estimate the amplitude of the signal by observing how many
divisions the waveform occupies on the screen
.
The scope's vertical sensitivity range is 10mV / div ~ 10V / div (1X range). In
the oscilloscope button panel, the keys for adjusting the vertical sensitivity are '
mV
'
and '
V
' button. Pressing the 'mV' button decreases the vertical sensitivity, which is
used to measure signals with smaller voltage amplitude. Press the 'V' button to
increase the vertical sensitivity for measuring signals with larger voltage amplitudes.
