Hi,
just as i sucessfully fixed one instrument (HP1980B is fixed now, works perfectly again) i have trouble with another one...
So, i have a Tektronix TAS250 analog scope (50Mhz, last series of analogs Tek made, U/dic and T/div controlled by rotary encoders, also has cursor and readout) and both Tek P6106 and P6122 probes (1:10 and both fast enough). Compensating them on the 1980B is no problem, gets perfectly flat.Same applies to my old Gould 1492 slooow digital. On the Tek i cant get a remotely flat line, and even with direct 50ohm coax input from a signal gen (looks good on the 1980) i get peaking.
What could be bad here? The more obwious stuff (dirty U/div switches) doesnt apply since it has electronic attenuator switching.
Again, i dont have a manual on that instrument, i got it at a public auction for real cheap (from a electronicy company that went bankrupt). Also it doesnt seem popular enough for the manuals to appear at the "typical" dealers.
Regards, robert