Traps in order to avoid When you use an Oscilloscope to Fix Welders and Plasma Cutters598460

Throughout the process of repairing a Welder or Plasma Cutter it's important to look at the PWM (Pulse Width Modulation) indicators that ascertain the output present-day. The output present is controlled with the duty cycle of the switching waveform. To validate which the waveform is with the correct Amplitude and Obligation cycle, an Oscilloscope can be used.

Most Analog Oscilloscopes tend to be more than satisfactory for taking these measurements on the other hand, Digital Storage Oscilloscopes (DSO) have become significantly much more well known (and practical). Two of the most crucial (and evident) traits of a DSO may be the capacity to plainly display a real-time (or captured) waveform at a significant pixel count / body refresh amount, also to retail store it for afterwards study. Typical Analog Oscilloscopes do neither.

Whichever sort of Oscilloscope you choose to use, listed here are some traps to prevent:

All Mains Driven Oscilloscopes contain the BNC Probe outer shield link linked to electrical floor. See yourself - evaluate continuity on your own Oscilloscope! The Company does this for security good reasons. A terrific strategy! Regrettably, from an products functionality point of view, this means that anything the Test Probe clip is linked to inside the circuit might be electrically shorted to Ground.

Let us suppose that you simply ought to choose a measurement from Electronic Ground into a Examination point. When there is a likely big difference in between the 2 grounds then infinite existing will would like to movement concerning the two potentials (only modest through the ground / circuit resistance). This normally ends in smoke!

Now, also be aware that Various Channel Oscilloscopes (Dual or four channel) contain the BNC Probe outer shield connections shorted jointly. For example: on a Twin Channel Oscilloscope (wherever Channel 1 and Channel 2 outer shields are associated alongside one another), depending on how the bottom clips are linked in circuit, you can now conclude up with recent flowing among both of these details (A double whammy)!

The first concern could be averted by utilizing a battery operated DSO, or using the addition of the Mains Isolation Transformer (in which the ground possibilities is floating for the Secondary output). The 2nd is often solved by utilizing Isolation Exam probes.

With DSO procedure, it really is significant that all Sign waveforms are sampled with the maximum sampling frequency accessible, then decremented as desired. This avoids any troubles with aliasing, wherever the signal currently being sampled seems at an incorrect frequency. Aliasing takes place when the Sampling frequency is much less than two times the Sign frequency (Nyquist theorem).

Also, try to remember that Welder and Plasma Cutter Higher Frequency (HF) and Pilot Voltages really should by no means be specifically calculated without the need of appropriate isolation, and High Voltage Probes ΚΟΛΛΕΣ JOWAT.