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Hi Jim

I have a Scopemeter 199 from around 1999.   It's firmware is version 1.22.      Assuming I could get hold of later firmware - big assumption - is there anything to be gained by updating the firmware or,, given the risks of things going wrong, is it best to leave well alone and forego any possible benefits?

Many thanks

Martin

Hi Martin,

Having checked with Fluke this product went out of service 2008. The latest version of the firmware V8.04

http://www.fluke.com/Fluke/uken/support/software/ScopeMeter_Firmware_Upgrades.htm

These upgrades discuss upgrades from version 6 so unsure what this would do to your instrument and therefore Fluke would recommend that it it sent back to them to upgrade

As a general engineers rule of thumb, "If it works dont fix it!"

I hope this helps

Peter

Yes, "if it ain't broke don't fix it."     It does help; your advice is very much appreciated.

Many thanks

Martin

Dear Jim ,

Nice day !  I want to get information if there a professional sensor testing fair in USA.  We want to take part in next half year .  Our products are inclinometer sensor ,tilt sensor.....

Hope get your reply!

Regards,

Sunny

Shanghai Vigor Technology Development Co., Ltd.

Hello Deep,

Could you help me know the sensor fair or similar fair in USA ?

Sunny

sales6@vigordigital.com

hello jim

i wanna to ask a question ,which is 'how can i measure the capacitance range of a trim cap or variable capacitor???

Hi Shubham,

                    Thank you for your enquiry,regrading measuring  variable capacitor or trim capacitor, it is simpleor  it is very complex, it is depends on how accurate reading you required, if you need simple indication of capacitance , you can use any suitable multimeter which can measure suitable reqired capacitance range,by taking reading by varing the capacitor and there are LCR meters are available , they are more accurate than multimeter and if your requirement is very accurate than you have to consider precision LCR bridge, they are very expensive than multimeter anf LCR meter, but I have not come cross, which can make measurement of variable capacitor by it self.

Please find some of order codes, which you can have a look in full details.

Agilent hand hold capacitor meter o/c 178-0328

Basic multimeter with capacitor measuring facility our o/c 128-3642

Precision LCR Bridge by Hameg  o/c 163-6919

Precision LCR Bridge by TTI, our o/c 351-0906

I hope, this will meet your requirement.

Thank you,

Regards,

Devinder Sohal,

Farnell technical,

Firstly thanks to the founders and community here at Element 14. This is precisely the resource I needed and hopefully I can get some input on a project that I am working on which is a bit outside of my usual area of expertise.

I would like to build a DC motor testing bench. The motors are used in medical equipment and we pull them out of machines which are being retired, or we repair machines which are in house for resale.

The motors that are most common are DC with a gear reducer at the output shaft and an encoder at the back end of the motor case which is run by the tail shaft. The link below shows one example, there are many other sizes of motors here in house, but well over 50% follow this basic layout.

http://www.dunkermotor.com/default.asp?gid=17&bid=0&cid=0&sid=13&lang=2&id=9&mid=6

A generalized view for these motors:

- Voltages range from 12 volt to 160 volt, and the amperage can be from .25 to 10 amps.

- Most of the stock is permanent magnet but around 25% are brushed.

- There are also quite a few servo motors which we would like to test as well.   

The ideal motor testing system would be small(ish) and relatively affordable so that we could deploy it into the field if necessary. My research has shown some good test benches but I also found I was developing more questions than answers as I got deeper into this. Here are the issues that I am contending with (there may be some dumb questions, but this is a bit new for me).

- Power supplies for testing the wide range of volts/amps seem hard to find. It would be ideal to have one that was flexible enough but I have not seen a good fit for the wide range of motors we have. Any suggestions would be appreciated.

- The encoder testing seems like it could simply be hooked up to something like Arduino, but we are just now getting into open source micro controllers so I might be off in that assessment.

- Getting true performance data is very important. The benches I see use a dyno type arrangement to accomplish this. Are there other methods which I haven't found yet?

- It would be optimal to run everything through a PC and I'm at the very beginning of researching software for this. Any suggestions would be appreciated.

Hopefully this is laid out clearly enough to get some useful feedback. There are definately examples of other businesses that solved this problem but that background data is lacking. Thanks in advance to anybody who steps up with suggestions.

Bruce   

Jim,

I am not sure if you can help me or not. Before my father passed away he collected electronics. I have some Westinghouse and Weston ammeter's some are in Wooden boxes. I also have a CLAROSTAT 240-C POWER RESISTOR DECADE BOX 240C. Two Biddle Precision Laboratory Rheostat Lubri-Tact. I need help identifying what these are and what they may be worth.

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