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Curve Tracer or Audio Analyser?
Curve Tracer or Audio Analyser?
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Old 25th November 2021, 12:03 AM   #71
kannan_s is offline kannan_s  United States
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What is the accuracy specifications? no mention in the specifications
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Old 25th November 2021, 12:14 PM   #72
mbrennwa is offline mbrennwa  Switzerland
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Curve Tracer or Audio Analyser?
Is there (or will there be) any documentation on the command set/protocol that is used to talk to the board? It would be nice to allow using the board with custom software.
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Old 26th November 2021, 03:51 PM   #73
benc is offline benc  United Kingdom
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kannan_s:
We will publish accuracy specs soon, these are slightly more complex to define as the accuracy in pulsed mode is a quite difficult to measure directly.

Whilst it's easy to dump a few amps for 100us into a non-inductive resistor and measure pulse height using an oscilloscope, doing this at high enough resolution is beyond any oscilloscope I've come across (most of ours are 8 or 10bit, even a 12 bit scope wouldn't have enough accuracy to be meaningful).

Development of the calibration system for the CTL503 took a huge amount of time, and as mentioned earlier, it is carried out with a DMM and 4 resistors. It takes 10-20minutes at least to do, so we developed an automatic system and fixture to speed it up (closed box calibration). Here's a screen shot of the CTL503 calibration page in EPIC:

Click the image to open in full size.

Ultimatley the accuracy of the CTL is largely defined by the temp-coefficient of internal resistors, and as you will appreciate producing an affordable unit does require some compromise. Still - in our experience - it is far more accurate than any legacy curve-tracer (short of a Keithley 4200).

mbrennwa:
Documentation is coming and we will detail the protocol as well, we have plans for an API at some point also.

Like most of our products, the heavy-lifting is done in the PC, so there is a fair complexity to interfacing to the unit - including some safe-guards regarding the HV PSU. We spent alot of time trying to make it 'bomb-proof', although time will tell how this works out.
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Old 30th November 2021, 07:31 AM   #74
mbrennwa is offline mbrennwa  Switzerland
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Curve Tracer or Audio Analyser?
I am not worried about accuracy, since calibration should be easy in the software.

However, what about precision? What about resolution? Tracing an IRFP150 is different from tracing a 2SJ74. Many tracers will do one, but not the other.
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Old 30th November 2021, 08:00 AM   #75
benc is offline benc  United Kingdom
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The highest 'Collector' resistor is 27K, the lowest 24R and the ADC converter is 24bit (less in reality), there is a compensation mechanism in SW to reduce/remove parasitic errors (such as those from the collector/ADC potential divider), so you can measure collector currents in the uA.
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