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Trouble Shooting

Trouble Shooting

1. The oscilloscope will not turn on.

First, check the power cord and power strip, check the power switch to make sure it is open (SDS1000CFL series has a power switch and a power protection switch). To determine whether the machine is powered on, observe whether the unit’s cooling fan is running. If the fan works, the machine is powered on. If everything is normal but the oscilloscope still does not turn on, please contact the after-sales process.


2. The screen does not display the waveform during the signal acquisition?

2.1 Check the connection of the probes to the signal being tested.


2.2 Check the connection of the signal cable and BNC on the oscilloscope.


2.3 Check the connection of the probes and the device under test


2.4 Check whether the device under test generates signals


2.5 Repeat the acquisition


2.6 Check the trigger status. Is the oscilloscope triggering?


3. Waveform appears but is not stable

3.1 Check that the trigger source channel is consistent with the waveform being viewed


3.2 Manually adjust the LEVEL trigger knob to see whether the waveform is stable.


3.3 Use AUTO to adjust the waveform automatically to determine whether the waveform is stable


3.4 Adjust time base, rule out false-wave interference (such as alias displayed waveforms)


4. The oscilloscope measurement amplitude are inaccurate

4.1 Check the units of the signal’s amplitude, the default unit is Vpp of a measure signal which means difference between the highest and lowest value, the effective value. For example, commercial power we say is 220Vrms but the Vpp is over 600V


4.2 Oscilloscope is not a highly accurate and precise amplitude measurement tool. There will be some amount of have quantization error.


5. Distortion is higher when measuring a high frequency signal

5.1 Distortion is larger when measuring signal near top limit of an oscilloscope’s bandwidth. Usually bandwidth should be greater than or equal to five times bandwidth of measuring signal. When using this rule the distortion will be very small.


5.2 Using the wrong probe will lead to a distorted waveform. At a minimum, the bandwidth of the probe should be equal than signal bandwidth. Ideally the probe bandwidth should be greater than or equal to five times the signal’s bandwidth. If the probe is a switchable (X10/X1) probe type, the 1X position usually has a bandwidth of 6MHz-10MHz while the 10X position is the maximum bandwidth of probe.


6. Waveform shows interference when measuring a small signal

6.1 Siglent oscilloscopes series can display and measure voltages in the mV range (or lower). Consider using the Bandwidth Limit function to reduce noise if the signal under test is under 20 MHz.


6.2 Connect scope ground clip to reference earth of signal which can reduce the distortion because of any electric differences between oscilloscope and measuring signal.


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