General Radio Test Equipment

Here is the beginning of my budding collection of General Radio test equipment.


Model 1650-A Impedance Bridge

In it's day, this device was very well respected and performed a valuable function in the electronics lab. Sadly, today's upscale DMM (digital multimeter) outperform it in most respects. Still, it is quite fun to be able to use this device to measure unknown component values.
This unit was purchased from a SK estate here in Taylorsville. Price paid: $60. Original list price: 

Country: United States of America (USA)
Manufacturer / Brand: General Radio Company; Cambridge (MA)
alternative name
GenRad
Year: 1959 ?Category: Service- or Lab Equipment
Semiconductors (the count is only for transistors)4:
Wave bands- without
Details
Power type and voltageStorage and/or dry batteries / 4 × 1,5 Volt
Loudspeaker- - No sound reproduction output.
Power out
from Radiomuseum.orgModel: Impedance Bridge 1650-A - General Radio Company;
MaterialMetal case
ShapePortable set > 8 inch (usable also without mains)
Dimensions (WHD)325 x 320 x 200 mm / 12.8 x 12.6 x 7.9 inch
NotesThe 1650-A Impedance Bridge was a versatile and compact instrument capable of accurate measurements of resistance, capacitance, inductance, dissipation and quality factor over a very wide range: 1 milliohm to 11 megaohm for resistance, 1 picofarad to 1100 microfard for capacitance and 1 microhenry to 1100 Henry for inductance. Accuracy better than 1% was given for R, C and L. The 1650-A used custom made precision components for the arms of the bridge: the CRL rheostat used a mechanical justifying mechanism with eight linearizing cams; a silvered mica, high precision capacitor was used as standard capacitor. The Orthonull device, with non reciprocal ganging of CRL and D dials, was available for easy of balance convergence in cases of low Q or high D.
Virtually any impedance measurement could be done with this instruments, also relying upon the operating procedures given in its instruction manual.
Price 440 USD
Net weight (2.2 lb = 1 kg)8.5 kg / 18 lb 11.6 oz (18.722 lb)
Price in first year of sale678.00 DM
Source of data- - Data from my own collection
Mentioned in- - Manufacturers Literature

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