Products > Test Equipment
Hewlett Packard 740B DC Standard Digital Voltmeter (and 740A)
beanflying:
Still some more to do but fairly straight and it still fits where is should. Maybe wouldn't like to send it bungy jumping attached by the handle but it seems fine for lifting.
Tony_G:
Did you get the input and output attachments with it?
Also it looks like it has a couple of photochoppers as modulators (A16 &A17) - Are they similar to the 419A construction? If so then they apparently benefit from being left on all the time (interesting discussion on the HP Yahoo Group regarding replacement neons as well). Annecdotally some choppers will come back to life if you leave them on for a few weeks (see discussions about the cadmium photocells) - Your mileage may vary on this though (my 419A never came back to life).
beanflying:
Similar photo chopper technology I gather and a Mercury reference cell somewhere inside I haven't come across yet. Recalibration and going over it in more detail when I get back together mechanically.
As above I scored an Input connector box but I don't have the output one and another member has the reverse. The connectors seem to have only been used on the 740A and B and the input one has had the extra pins pulled I am assuming to prevent connecting to the wrong side. Most likely this will mean changing out this connector unless I find the other.
edit: Just about finished cleaning up one of the breaks very happy with it. Last time I did any of this was nearly 30 years ago on aluminium irrigation couplings with oxy/acetylene. More heat would be a help here not more temperature.
beanflying:
Sanded both side frames with 180 grit finish to take out a few scrapes from the the years and to blend the repair a little more.
Vinyl and front panel cleaning time. But first a well earned beer :popcorn:
kj7e:
Nice job :-+
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