If you need help on Test and Measurements, please post your question here!

Hi Jim,

I'm develloping systems based on ucontrollers and a variety of wireless devices. The wireless devices have a CE end FCC marking, if I have a device with only a ucontroller I can do the CE marking myself. But if I combine the ucontroller and wireless I need testing (Europe/Netherlands).

My question is: can I do this testing myself and what type of equipment do I need?

Regards,

Klaus de Jong

Hello Jim,

I am the creator of the ExactCharge Refrigeration Calculator which is available for SmartPhones, iPhone, and Windows based computers. I would like to create a stand alone calculator of my software for distribution in hvac supply houses but don't know where to start to begin to develop the calculator prototype perhaps using Arduino.  We currently have the ability for SI scale so we could distribute the product Wordwide.The ExactCharge Calculator has been available for 6 years and is well appreciated by those who own it. Ritchie Engineering has a stand alone PT device but it does not have near the functionality of the ExactCharge Calculator software. I was hoping you might be able to point me in the right direction. You can view my product at www.exactcharge.com to help gain a better understanding of its abilities. A stand alone version should sell well and have a good profit margin. Any help would be greatly appreciated.

Thanks

Hi Jim, What is the recomended method for checking fuses in a 3 phase motor circuit?

  Thanks for your time

   Richard

Hi,

   Please find attached link for software for Tenma 72-8225, if  you have any further enquiry, please send me email techsales@farnell.com

http://www.element14.com/community/docs/DOC-29601/l/usb-driver-for-window-764-bitfor-ut2042cfarnell-oc-1739443-tenma-72-8225

Thank you,

Regards,

Devinder Sohal,

Hi Dirk,

You have a few options, each with pros & cons:

1) Use a differential probe to measure across each phase.

2) Use a scope with isolated channels.  Several handheld models offer that capability, plus the Tektronix TPS2000 series instruments.

3) Measure each phase relative to ground and use maths function on the scope, or offline ona PC) to derive the phase measurements.

In any case DON'T cut your scope's ground lead and float the instrument - it's dangerous and violates numerous safety standards.

Tektronix have an application note on making floating measurements.  You can download it from: http://www.tek.com/Measurement/App_Notes/3M_17773/eng/3MW_17773_0.pdf

Cheers!

I am sorry, Tektronix do not have GPS disciplined oscillator devices and I have checked in Farnell range as well with other our supplier.

Thank you for enquiry.

Best regards,

Farnell technical