Nice! Also big thanks to Miron for that last minute push.
I’ll make arrangements with Tim. Thanks, everyone!
Nice! Also big thanks to Miron for that last minute push.
I’ll make arrangements with Tim. Thanks, everyone!
I suspect he’ll be waved through provided he convinces them it’s for personal use.
If we have too much money I’ll put my $50 into the cnc.
So we’re a go on MSO?
How would you like that extra $45 Jarret?
It looks like it. I will let you know as soon as we have stuff figured out
Order has been placed, expect it in the hackspace Feb 20th
Rigol MSO1074Z
70 MHz Mixed Signal Oscilloscope with 4 analog channels as well as 16 digital logic channels plus 12 Mpt memory and 1 GSa/sec sampling
$784.90
Considering this is a valuable piece of equipment, and rather easily damaged (think ground shorts, over-driving inputs). I would like to suggest that a committee be formed to provide training and that training be required before use (like the Tinkerine, Laser, etc.). I volunteer to be part of the committee, however someone will have to train me on proper use of the oscilloscope, I’m very sure I have some bad habits.
Is there an isolation transformer at the space? We could place it next to the scope to make it easier to prevent ground shorts.
I think I should say that.
Basic rule I use is:
Multimeter FIRST.
Multimeters are built to take some extreme voltages and is a good way to
make sure voltages/currents will not fry the scope. If we don’t have a
decent multimeter we should get one.
While this is probably wise, it’s not the issue @hectorh is concerned about. A multimeter is an isolated instrument (that is both of its measurement inputs are isolated from ground and line, and thus any other device), the oscilloscope is not. Scope probe ground is connected directly to mains earth. What this means practically is that your scope ground must connect only to grounded (and preferably not even that, as current can still flow) or isolated points on the DUT. If you aren’t aware of this or don’t heed it, large currents can flow from e.g. a power supply rail, through the ground lead and the scope internals.
A simple rule of thumb like ‘DO NOT MEASURE MAINS POWERED THINGS’ is probably a good idea if a full safety training isn’t the plan.
Well, a meter would be able to measure any voltage between scope ground and the ground of whatever you are planning to connect.
Does the Variac we have act as an isolation transformer?
I sincerely hope this unit gets good use. I don’t see too many folks
working on projects pushing the limits of the device.
The spec says 1meg Ohm input on the analog channels and 300Volt rms with
10:1 probes so doubt it will ever get overloaded with normal usage.
Agreed that we need to do some training but if anyone is planning to work
on mains powered stuff (toasters, coffee machines, and other appliances )
while they are connected to power, a completely different but essential
training course is required.
This instrument hopefully will NEVER be used for this!
To quote “if sex gives you a pain in the neck - you’re using the wrong
tool!!”
I am happy to volunteer to run a course for this (and how to measure mains
powered stuff too) unless someone else steps up.
F
I think we can attach a paper onto the front of it, with some stern warnings.
Doesn’t mean nobody is going to use it incorrectly, but it might stop a few.
I have received the scope. The package is complete with all the parts
indicated on the parts list.
Some damage to the external box, but no damage into the inner box.
The scope appears functional.
We need to perform a full calibration and functionality test back at the
hackspace Saturday Feb 20th.
I will probably be there sometime around 13:00
Maybe we can convince/bribe Marc to calibrate it at his lab?
The “Full Calibration” in the scope menu takes a very long time. I cancelled mine after 30 minutes.
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Does a new scope require calibration beyond just letting it sit and self calibrate?
Self calibration.
Let’s find an Arduino with dual analog output!