General Radio 1650-A C/R/L Impedance Bridge – Professional Lab-Grade Instrument For Sale
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General Radio 1650-A C/R/L Impedance Bridge – Professional Lab-Grade Instrument:
$250.00
General Radio 1650-AC/R/L Impedance Bridge – ProfessionalLab-Grade Instrument
Before there was HP, there was GR… General Radio(GenRad). From the 1920s to today, theywere famous for their superior, precision test equipment. These were laboratory standard apparatus.
The1650-A Impedance Bridge is a versatile and compact instrument capable ofaccurate measurements of resistance, capacitance, inductance, dissipation andquality factor over a very wide range: 1milliohm to 11 megohm for resistance, 1picofarad to 1100 microfarad for capacitance and 1 microhenry to 1100 Henry for inductance. Accuracy is better than 1% given for R, C and L. The 1650-A uses custommade precision components for the arms of the bridge: the CRL rheostat uses a mechanical justifyingmechanism with eight linearizing cams; a silvered mica, high precisioncapacitor is used as standard capacitor. The switchable Orthonull device, withnon-reciprocal ganging of CRL and D dials, is available for easy of balanceconvergence in cases of low Q or high D.
This is a transistorized and portable version of their rack-mountimpedance bridge. It runs on 4 D-cell batteries. It is still a useful piece of test equipmenttoday. There are few modern equivalents. In 1966, it cost a bit over$1000.Virtuallyany impedance measurement can be done with this instrument.
Thecondition is fully functional. It hasnew alkaline batteries, and two new rubber feet. The (hot) External Generator binding post hadbeen broken off. I repaired it by boringout the old post remains; tapping new threads; adding a new brass all-thread;and re-mounting it with coaxial, epoxy paste (see picture). The unit was cleaned, and the short gaskettear was repaired with RTV Silicone gasket glue. The case shows normal wear for an item 50+years old.
A complete 36-page operational manual is available fromthe IET site below:
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