I got these two pieces of equipment.
One is a Data Precision benchtop DMM. It had a bad power transformer. It ru ns on a shunt Zener regulation using the impedance of the transformers. not something I would have done. But it's current drain is in the mA, maybe 10
0 or so. Might be a bit more if I happen to be reading 88.888 volts, it is LED. I prefer that, I find it easier to see and it is a bigun.Then I got this Tektronix 422 with the battery option. It has a very elusiv e fault and I think it is the transformer. I have been through many tests o n this, but it comes back to the transformer. However it works well on 12 v olts. the internal transformer gives it like 27 and it gets hot and shuts d own but in 12 or so volts it will run forever.
So these two Are going to become my road set. I also got one of those car j ump starters that will undoubtedly run it for quite some time. But I would rather not do that. I would rather custom the system.
The scope drains around two amps tops, usually lower. I am not even thinkin g about using the original batteries, or their equivalents, it is too easy to modify the charging and use much better newer ones, and lighter. This th ing is heavy. And then I want to screw a DMM to the top of it ? Yes I do.
I think I want the whole thing to be powered by one battery, and I want the charger integrated so all I have to do is plug it in, I'll put an IEC on i t, any cord works. I also want the charger to charge and operate the unit s imultaneously. And I want CAPACITY, like if I go to Montana or something.
Recommendations ? Maybe a laptop battery (19 volts) with a Joule thief ? Ke ep it at 14 volts, that would work. I can calculate from that.
This would be great like when I go down to Hillbilly's. He messes with engi nes. Well I set ignition points with a scope. You want the points closed ex actly 2/3rds of the time. That is dwell.
Anyway, maybe I get some hosting and show it. The scope is much deeper than the meter. In fact the depth of the scope is why I don't keep it on the bu nch. I can give it 12 volts all day long. But it sticks out too much. But b ehind the meter on the top could be a spot for the battery and charger. May be.
What would you do ? (and don't say throw al that junk away)