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Old 8th May 2010, 03:53 PM   #31
ilardi is offline ilardi  United States
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I, for one, would like to express my thanks for a USB version. Parallel ports have been hard to come by for a few years. I'm down to one parallel port PC these days-and it is truly ancient (I use it, to run a light controller I built about a dozen years ago, that runs off, you guessed it, the parallel port).

My plan would have been to use a USB to parallel adapter with this curve tracer-although I wonder if that would actually work -can anyone speculate?

Terry
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Old 8th May 2010, 04:31 PM   #32
EUVL is offline EUVL  Europe
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You need something like this :

EPP Parallel PCMCIA Cards by Quatech

There is too much performance loss using USB (speed of measurement).


Patrick
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Old 8th May 2010, 05:58 PM   #33
ilardi is offline ilardi  United States
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Thanks for the recommendation.

BTW, how much time are we talking about to take a 'good' measurement?

I'm curious as to why it would be so slow. Is it the throughput of the USB (480 Mbit/s~57 MB/s)? Or is USB just architecturally flawed?

Thanks for any info you can provide.

Terry
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Old 8th May 2010, 07:06 PM   #34
EUVL is offline EUVL  Europe
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Seconds, or the device will heat up.

Patrick
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Old 8th May 2010, 11:11 PM   #35
ilardi is offline ilardi  United States
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Then if I understand you correctly the USB version takes > seconds and so causes the device to heat up. Correct?

Terry
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Old 9th May 2010, 02:42 AM   #36
locky_z is offline locky_z  China
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The original Curve track software use 'bit' to to simulate SPI protocol through Parallel ports

But USB is only support frame transmission ,The minimum frame is 2ms,
If I send a 8 bit SPI protocol ,I must send 8 frame at least.It will be very slowly.


So, If use USB,you must use a MCU outside, and receiver macro command and send SPI protocol to control ADC/DAC. This mean you must develop two set software, one is PC,one is MCU fireware
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Old 9th May 2010, 08:25 PM   #37
Danish is offline Danish  United States
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Good to see some progress here Locky!
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Old 31st May 2010, 04:43 PM   #38
locky_z is offline locky_z  China
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RS232 adapter already complete
Click the image to open in full size.

and English Version have done.
Click the image to open in full size.
Above picture is measure 2SA970 hfe-Ic curve track on different Sample.

the bottom curve is 1 times sample
another curve is from 2 3 6 10 18 34 66 times sample.The more sample,then measure speed is slow.
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Old 8th June 2010, 04:50 PM   #39
EUVL is offline EUVL  Europe
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Well done. Good progress.



Patrick
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Old 11th June 2010, 02:40 AM   #40
locky_z is offline locky_z  China
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Default RS232 Version Software

RS232 Version Software
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