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Just my 2 cents. First 200V is sitting on top of 30V, so make sure to look at 30V (since your 200V is high). Look at voltage ripple on the big rectifier caps, maybe they are dried out. I see that they

Niels, I concur with Miguel's estimate. I've bid on a couple of these over the past few months on eBay, and they've all gone for more than $200 (US). The asking prices are upwards of $500, and that is

You're overthinking it. Most of the time you can tune a PID controller manually with way less effort then it would take to model the system mathematically and then prove that the model is correct. For

I would be interested too! Any photos? I would rather say around 400 euros. I've seen quite a few 7L5 sold for more or less 300 euros on ebay.

go to his website, pearl audio in Canada I think

500-700€, it has logarithmic sweep? -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de Niels J?rgensen Enviado el: mi¨¦rcoles, 12 de enero de 2022 16:24

Also needed motor-load gearing constants, inertias of moving parts, angular resolution (encoder or motor poles number), overall realistic system specs ("just exactly what are you trying to achieve")

Liam, I have been trying to reach you regarding the HP 3457 manuals which I have bought from you. I need you to send them to me.

I have a 577 that is a very early serial number "B0100124" and it has some issues with convergence of the calibration. I have tracked this down to lots of out of spec components on the analog board

Help needed , what is a realistic price for a 7L5 with L3 and OPT.25 tracking generator ? I now it is a very old machine , but it is still working and in fine condition . Niels : EU / Denmark

Fair enough. The Philips "combiscope" range also have full digital control of the analogue side of things for calibrati

On the contrary, both timing generation and vertical amplification are controlled by voltages from the DAC, as are the cursors, the trigger voltages used for automated measurement and so on. If you

Details?

Dear David I am sure that you can easily solve this without consultants. PID motor control is a classic application of control systems theory. I took the course in 1965. We used a bode plotter from

Practical tuning issues. In a nutshell I can arrive at some setting for the PID coefficients that work for a step movement of say 2 revolutions of the motor, but don't work for 20 revolutions, or 200

Seems sensible - that said I'm not sure the DAC generates any signals critical to the measurement accuracy of the 'scope (or is there something that I missed?). -- Paul

Hoping this finds you all well with a good start into 2022. Back at this. I've replaced the dual diode with an HSMS-8202. That solved DC offset, with the no-input trace right in the center of the

Possibly it got hot enough to re-solder itself.

Is there anyone skilled in this field who'd be prepared to help me? If so please contact me off-list mailto:david.partridge@... Thanks David

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