Hi,
My Hameg HM8130 function generator just stopped working. The main fuse has blown for no reason when I was using it.
The HM8130 is an arbitrary function generator from the beginning of the 90s. Mine seems to have been built in 1993 (see main board).
Even if Hameg is German, it seems to have been built in France, in Villejuif. That's a town not far from Paris, less than 10km from where I live.
The factory seems to have long closed.
Remote controllable using GPIB or RS-232 with an extension board, which mine doesn't have. There is a "hole" for that on the back (see picture).
It is a very capable unit. Sine waves, square waves, pulses. Up to 10MHz for sine wave. I've taken a quick a look at schematic, it doesn't seem to use DDS for sine wave generation or square. Seems to be purely analog.
I'm trying to repair it. To troubleshoot it, I disconnected the PSU from the "main board" and the fuse keeps blowing. So problem must be around PSU.
I've taken only a quick glance. Checking the filtering caps with my handheld DMM, ok. Rectification diodes also seem ok, but some allow voltage in reverse.
The schematics are available in the pdf of the french manual on hameg's website. The suppli voltages are -12/+12, -5/+5, and VCC (5V for digital). As you can see on pictures, there a big black radiators for them (probably overkill).
The -12/+12 supply both use two linear regulator IC in series : L200? followed by 7912/7812.
I'll keep you guys updated if you're interested.
Best regards,