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Ad Category : Main > Test Equipment
ZM – 4 B/U Wheatstone Resistance Bridge, (C.1957) Ad # : 1458
Ad Details
Seller: richsequip
Ad started: Jan 10
Location: United States IL 60543
Price: $ 75.00 USD
For Sale: This is a ‘Mil-Spec’ instrument & everything in it is top quality. The 5 Potentiometers are large, heavy & almost all solid brass. This can be used as a precision decade resistor substitution box with an accuracy of /- 0.15% in 1 Ohm steps from 1 to 10110 Ohms. Besides being used as a Wheatstone Bridge to find an unknown resistance with the sensitive galvanometer, it can also be used to trace cables & locating shorted & crossed cables & to compute the distance to breaks! All connections are to binding posts although 2 will accept banana plugs. It requires 3 ‘D’ batteries or an external DC source to operate although this isn’t necessary to use as a decade resistor substitution box. No cables or batteries are included, but a full manual copy is & directions are also printed inside the snap down cover. The rubber gasket in the cover should make it very water resistant. Some scratches on outer case, but interior panel in perfect condition. What seems to be a smudge centered in the 4 pots is clear sealant over an Air Force logo. Price not including shipping is $75.00 (Like most Mil-Spec equipment, the Army likely paid about 10 times this amount for it!)


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