Fnirsi 1013D Product Instructions page 11

Answer: Set the trigger mode to Auto, and then press the [AUTOSET] button once. If
it is not resolved, the probe on the probe may not be grounded, or the probe end of
the probe may be disconnected. Please use a multimeter to check whether the probe
is normal.
8: Why does the waveform of the test shake from side to side and cannot be
fixed?
Answer: You need to adjust the trigger voltage, that is, the green arrow on the right.
Press and hold the green trigger arrow on the right and move it up and down. You
need to adjust the green indicator arrow between the upper and lower waveforms.
The waveform is triggered and fixed, or you enter the setting. Menu turns on "Auto
50%"
9: Why can't Il capture the sudden pulse waveform or digital logic signal?
Answer: Adjust the trigger mode to "normal" or "single" , and then adjust the
trigger voltage, time base, and vertical sensitivity.
10: Why is there no waveform when measuring a battery or other DC voltage?
Answer: The battery voltage signal is a stable DC signal and has no curve waveform.
In the DC coupling mode, and then adjust the vertical sensitivity, an upward or
downward offset straight line waveform will appear. If it is AC coupling, no matter
what No waveform adjustment
11: Why the charge is not full?
Answer: It may be using a laptop or USB charging below 2A. The USB output power
of the laptop is too small to be dissatisfied. Replace it with an original 5V2A charger
and it will be full.
12: Why is the waveform of the 220V power frequency 50Hz AC very stiff?
Answer: The oscilloscope needs to display such low-frequency signals at 50Hz. The
sampling rate needs to be very low to capture the 50Hz signal. The oscilloscope will
wait when the sampling rate is low. Therefore, it behaves as a "change card" . All
oscilloscopes in the world are measuring 50Hz signals. Change cards every time, not
because the oscilloscope itself
13: Why is the peak-to-peak data of VPP below 600V instead of 220V or 310V
when measuring the 220V waveform of the commercial power?
A: The mains 220V is a symmetrical AC signal. The positive peak voltage (maximum
value) is + 310V and the negative peak voltage (minimum value) is -310V. Therefore,
the peak-to-peak value is 620V. Click [Parameter Display] to enter the parameter
control bar to open the effective value. At this time, the 220V voltage is often said. The
effective value of the mains voltage fluctuates between 180 — 260V, so the
peak-to-peak VPP is in the range of 507 = 733V.