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On A Hippie Trail, Head Full Of Zombie
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Old 14th February 2020, 02:34 PM   #171
2 picoDumbs is offline 2 picoDumbs  Australia
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Hahaha

What are you doing awake?
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Old 14th February 2020, 02:50 PM   #172
JeffYoung is offline JeffYoung  Ireland
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On A Hippie Trail, Head Full Of Zombie
Pico, pico. What's with that digital oscillo-thingy?

Real men bathe in the light of a proper ray gun:

On A Hippie Trail, Head Full Of Zombie-t3-filament-oscilloscope-trace-jpg
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Old 14th February 2020, 03:42 PM   #173
2 picoDumbs is offline 2 picoDumbs  Australia
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Yeah.
I can probably get hold of a nice old CRO.
Hahahaha
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Old 16th February 2020, 02:36 AM   #174
2 picoDumbs is offline 2 picoDumbs  Australia
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Default Contact Resistance

Today I was reminded how much I hate non-soldered electrical joints.
I have a Fluke 289 multimeter (not cheap), I have been noticing the resistance measurement slowly creeping up (over a couple of years) when taking a zero measurement, it had creeped up to over 2 Ohms.
Visually the leads looked fine, and the probes looked shiny new.
I honestly thought the meter had gone out of calibration or was faulty.

Anyway today I decided to clean the probes with p800 SiC paper and IPA after cleaning the contact surfaces, the zero measurement went from 2.3 Ohms to 0.11 Ohms.
Oxides and crap build up on surfaces and many oxides are not even visable to the eye. This is another example of why non-soldered joints are not good for my mental health. Hahahaha

I would have assumed Fluke to use something better for the price they charge eg gold plated.
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Old Yesterday, 05:30 AM   #175
2 picoDumbs is offline 2 picoDumbs  Australia
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Very first measurement at the original setting of 5/15 Ohms.
Distortion is 0.17%, around SIT3 levels.
2nd harmonic is -46dB and Third harmonic is -61dB, and virtually nothing else.
Hope to get it to around 0.07 to 0.1%, but maybe I will actually prefer it higher.
I will try some other jfet source resistance settings.

I have throne away 6dB in negative feedback to get the damping factor where I want it so that probably explains the higher values of distortion.
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Old Yesterday, 07:35 AM   #176
generg is offline generg  Germany
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On A Hippie Trail, Head Full Of Zombie
Throw away only two dB....

:--))
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Old Yesterday, 08:35 AM   #177
2 picoDumbs is offline 2 picoDumbs  Australia
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I am going for a small amount of negative output impedance for infinty damping.
Hahahaha
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Old Yesterday, 08:52 AM   #178
generg is offline generg  Germany
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On A Hippie Trail, Head Full Of Zombie
Stay on earth, keep the balance!

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Old Yesterday, 08:55 AM   #179
Zen Mod is online now Zen Mod  Serbia
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On A Hippie Trail, Head Full Of Zombie
Pico?

naaaah......

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Old Yesterday, 09:00 AM   #180
2 picoDumbs is offline 2 picoDumbs  Australia
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Hahahaha
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