I am sure that 11800 series was COCOM / export controlled product and so was its technical documentation. Maybe still is... When things get onto export control list they tend to stay there for a very

Quiter fan would mean that 11801 can be used more and for longer. And this is exactly what I don't want! Leo

I have great respect for what Tek did before fully digital scopes. How can't you when every other worthy appnote has images of JW's famous 556 with damaged screen?! However, to me, Tektronix has died

This is one heck of a rabbit-hole! I wonder what would the calibration process be? There are nine adjustable parameters - assuming knobs have grub screws. Leo

Sorry to keep beating beating the dead horse but I wanted to find out what is important in this circuit and what is not. It turns out any shunted (or even shorted) linear pot has quadratic and linear

Dennis, It's not based on logarithms and the pots have linear taper. It's based on the fact that parallell resistance of a rheostat shunted by the fixed resistance of the same value has a quadratic co

It's not intuitive but if you do the math it is, indeed works out perfectly linear - assuming the trim pots are set to the value of 50R. Whoever designed it, deserves to be an employee of the month. T

It's pretty trivial, drive thermal elements via pots and stick temperature pickup into the bridge: https://m.eet.com/media/1149992/23436-46857.pdf Leo

What I really like about RS-232 is that RS stands for "Recommended Standard"! Leo

It can be also done with linear pots and quadratic scale markings around the pot. Or a slide rule with two sliders. Leo

Has anybody produced anything interesting recently for CSA803 / 1180x series that allows remote comms? Apart from screen shot capture and printing. The talks about these instruments spring up now and

Thanks, Dennis - just got it. Leo

Hello Dennis, I am embarrassed to ask, but when can I have my turned down donation back? Thanks Leo

Dennis, Given the mess with account name and group.io emails handling could you please post the list of names you have received the donations from? On the 31st of December, moments after your appeal w

I have used Pico's TA018 with good results for 20-30A project https://www.picotech.com/accessories/current-probes-clamps It was accurate, had long battery life and was reasonably cheap for one-off use

I am not planning to do anything with LCD replacement. It was just heads up for those with bad CRT or those with spare time on their hands. It can be anything from simple scaler hack (it still took me

My CSA803 does not have this function. Leo

If anybody wants to replace CRT on CSA803 or 11801/11802 with an LCD please go ahead - it is doable. I had a quick go at it and it seems reasonably straightforward. http://www.leobodnar.com/files/CSA8

Yes. I have removed LED from the head and it stopped bouncing back and forth. Make sure no other channel LED is blinking as it will affect the traces on all active channels. I suspect the LED return c

You can cut the tracec to the LEDs on one bay for precision work. ITT Cannon connector pins for channel LEDs are 18 and 32. Leo