Quote:
Originally Posted by stuarth
Could you use a battery powered 'scope?
Stuart
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Battery scopes are a good option.
The one I would recommend is the Hitachi V509, which is a compact scope, can be powered from 12V, has TV H & V sync standard, a helpful delay timebase & has a super intense sharp focus CRT beam as the small crt runs from 10kv EHT, can be seen in daylight, and is 50MHz bandwidth, they come up on ebay from time to time.
(The 222ps of course runs from batteries too, as well as its AC adapter, but has the advantage of isolation to the extent that the scopes input stages are isolated and over-voltage protected, so high voltage transients do not damage it easily either and the dual isolated inputs allow two channel display of waveforms with completely disparate relationships to ground or any other potential, so really its pretty hard to beat).
Another possibility, the Tek 464/466 scopes had a inverter option (an add in pcb) for battery use, its quite clever. There are extra windings on the power transformer which are driven by transistors in a self oscillating circuit with a small toroidal core with sharp saturation properties (its basically a Royer Oscillator) I think off hand it causes the mains power transformer to then run at about 400Hz from the DC supply.