Split from the Rigol thread:
As said, delivery time was good, less than 24 hrs from confirmation of order (Farnell) This 'scope started life out as the GW Instek GOS 630FC.
All workie workie so far, the only waveform I had to hand for checking was the 'scopes Cal and the AC mains, the 'scopes Cal waveform is a bit shy of its target frequency, but by not a lot, inside it looks like two or three transistors for the Cal osc, there's a couple of presets close by, it's hard to say what one was labeled up as but the other is Cal, possibly one for set frequency and one for amplitude.
Everything looks reasonably accessible inside, just two main boards, the only surface mount stuff is on the LCD driver board, I suspect the timebase is derived from that also, the only sure fire signal I could use to check the frequency counter was AC mains, it checked out accurate against the digital readout on an earth loop impedance tester I have.
It's 2Kv or so for the CRT.
All the other internal pots etc are labeled with there functions, highest winding on the mains tranny secondary is about 200 volts.
No one off special IC's that I could spot on the main boards, all looks like standard stuff.
The panel/knobs case etc are a nice pro finish, the detents on the timebase and Y amp selectors are are just about right, not too heavy or stupidly light, nice action on the other controls, nothing feels scratchy.
The probes are typical generic types, nothing to write home about, 1x/10x, 6 Mhz/60 Mhz, the coax is not stiff, quite floppy, compensation adjustment is smooth.
So far so good.
Next mission is to get some radio bits to fiddle with, I used to have a fair bit but had to flog stuff off including the receiver collection to raise funds towards a major purchase...Long story.
First project will be a 12 volt valve regen detector tunable from 3 to 3.5 Mhz with as little amplitude variation as possible across the range at the sweet spot for SSB/CW etc.
A likely valve candidate will be an ECC82, I can run that with 12 volt heaters, it's low mu with a low input capacitance and according to the Ia/Va curves against bias it should be ok with low bias at 12 volts HT:
http://www.r-type.org/pdfs/ecc82.pdf
I'll report on that project as and when, It'll be a few weeks yet.
Lawrence.
As said, delivery time was good, less than 24 hrs from confirmation of order (Farnell) This 'scope started life out as the GW Instek GOS 630FC.
All workie workie so far, the only waveform I had to hand for checking was the 'scopes Cal and the AC mains, the 'scopes Cal waveform is a bit shy of its target frequency, but by not a lot, inside it looks like two or three transistors for the Cal osc, there's a couple of presets close by, it's hard to say what one was labeled up as but the other is Cal, possibly one for set frequency and one for amplitude.
Everything looks reasonably accessible inside, just two main boards, the only surface mount stuff is on the LCD driver board, I suspect the timebase is derived from that also, the only sure fire signal I could use to check the frequency counter was AC mains, it checked out accurate against the digital readout on an earth loop impedance tester I have.
It's 2Kv or so for the CRT.
All the other internal pots etc are labeled with there functions, highest winding on the mains tranny secondary is about 200 volts.
No one off special IC's that I could spot on the main boards, all looks like standard stuff.
The panel/knobs case etc are a nice pro finish, the detents on the timebase and Y amp selectors are are just about right, not too heavy or stupidly light, nice action on the other controls, nothing feels scratchy.
The probes are typical generic types, nothing to write home about, 1x/10x, 6 Mhz/60 Mhz, the coax is not stiff, quite floppy, compensation adjustment is smooth.
So far so good.
Next mission is to get some radio bits to fiddle with, I used to have a fair bit but had to flog stuff off including the receiver collection to raise funds towards a major purchase...Long story.
First project will be a 12 volt valve regen detector tunable from 3 to 3.5 Mhz with as little amplitude variation as possible across the range at the sweet spot for SSB/CW etc.
A likely valve candidate will be an ECC82, I can run that with 12 volt heaters, it's low mu with a low input capacitance and according to the Ia/Va curves against bias it should be ok with low bias at 12 volts HT:
http://www.r-type.org/pdfs/ecc82.pdf
I'll report on that project as and when, It'll be a few weeks yet.
Lawrence.
