Technical Issues

Water Quality Testing

A water quality Lab establishes standards for drinking water which fall into two categories, Primary Standards, and Secondary Standards. Primary Standards are based on health considerations and are designed to protect people from three classes of toxic pollutants: pathogens, radioactive elements, and toxic chemicals.

The sizes listed for screens tablets and paper can often be confusing with a number like A3, Tabloid or 8 1/2 X 11 given. 

Here is a reference for most of the sizes in use today whether European (Metric) or USA and Canadian which is mixed but mostly in Imperial English or Inch sizes.

Paper Sizes both Metric and the American/Canadian sizes

To get to the point, the service request for help was made and handled quickly and the problems were resolved within 24 hours of contacting service. My oscilloscope is working on all four channels and I’m happy with the service provided.

When you buy an expensive item from an overseas supplier you always wonder if it can be serviced competently and if people will stand behind their products. It’s always pleasant to find that a company keeps its word for good service.

I received the Hantek 6254 BD oscilloscope in the fall of 2018 but had little time to do a thorough evaluation. However, the initial findings were good – after I learned to cope with a software oscilloscope instead of switches and dials.

To do a quick evaluation I used a STM32F4 Discovery board that I had handy – the one with four lights you can program in a carousel. It was handy because I could blink the four lights in a circle and show the resulting pulse on one of the channels – something like this…