650-A: Difference between revisions

650-A (view source)

Revision as of 03:50, 18 June 2024

2,283 bytes added , 17 June

no edit summary

Jerry

9,247

edits

@@ Line 1: / Line 1: @@
-The '''General Radio 650-A''' is an impedance bridge introduced in 1933.
+{{GR Product
+|model=650-A
+|codes=BEAST
+|class=impedance measurement
+|summary=Impedance Bridge
+|image=GR 650-A Close-Up.jpg
+|caption=General Radio 650-A Impedance Bridge
+|series=650
+|introduced=1935
+|discontinued=1956
+|designers=
+|manuals=
+* [[Media:GR 650-A Impedance Bridge Manual 346-B.pdf|General Radio 650-A Impedance Bridge Manual 346-B]]
+* [[Media:GR 650-A an 650-P1 Impedance Bridge Manual 346-I 01_1962.pdf|General Radio 650-A and 650-P1 Impedance Bridge Manual 346-I 1962]]
+{{Catalog History}}
+}}
+The {{Title|General Radio 650-A Impedance Bridge}} was introduced in {{Catalog H}} and remained available through {{Catalog O}}.
+The Type 650-A is a CRL impedance bridge with a basic measurement accuracy between 1% and 2%.  Its a self contained battery operated null instrument with an internal AC generator and DC potential. The internal AC generator is of the microphone hummer type similar to the Type [[572-B]] and powered by four six inch dry cell batteries. The DC test potential is derived from same series of batteries located in a compartment at the back of the copper lined walnut case.  Inductance and capacitance is measured in six ranges and resistance in seven ranges. Measurements are made using three bridge circuits, the Wheatstone, Hay and Maxwell. The recommended detector is a pair of high-impedance headphones for AC measurements. A panel galvanometer with a switchable shunt is used for DC nulls.
+An accessory Type [[650-P1]] Oscillator-Amplifier is available providing a 1 kHz generator and a detector amplifier. See the Type [[650-P1]] for details.
 Frederick Van Veen [https://www.ietlabs.com/pdf/GR_books/The%20General%20Radio%20Story,%20van%20Veen.pdf writes]:
@@ Line 6: / Line 26: @@
 Priced at $175<sup>1</sup>, the 650 was one of the most successful instruments in the Company’s history, remaining in the GR catalog for the next quarter century.
 </blockquote>
+==Specifications==
+* '''Resistance:''' .001 Ω to 1 MΩ in seven ranges
+* '''Capacitance"''' 1 pF to 100 μF in six ranges
+* '''Dissipation Factor:''' .002 to 1 in two ranges
+* '''Inductance:''' 1 μH to 1 H in six ranges
+* '''Storage Factor:''' .02 to 1000 in two ranges
+* '''Basic Accuracy:''' 1% to 2% see manual
+* '''AC Test Frequency:''' 1 kHz
 ==Links==
-* [https://archive.org/details/sim_general-radio-experimenter_april-may-1933_7_11-12 Robert F. Field, ''The Convenient Measurement of R, L, and C''.  General Radio Experimenter, Vol. 7, Nos. 11 and 12, April-May, 1933].
+* [[Media:GR Exp 650-A 04_1933.pdf|Experimenter April 1933 describing Type 650-A]]
+* [[Media:GR Exp 650-A 09_1944.pdf|Experimenter September 1944 describing Type 650-A]]
+* [[Media:GR Exp 650-A 04_1945.pdf|Experimenter April 1945 describing Type 650-A]]
+* [[Media:GR Exp 650-A 04_1946.pdf|Experimenter April 1946 describing Type 650-A]]
 * [https://digital.sciencehistory.org/works/jm214p20f General Radio Type 650-A Impedance Bridge] @ Science and History Institute Museum Digital Collection
 <sup>1</sup>About $4,100 in 2023 dollars
+==Photos==
+<gallery>
+GR 650-A Front.jpg
+GR 650-A Front A.jpg
+GR 650-A Left Side.jpg
+GR 650-A Top.jpg
+GR 650-A Right.jpg
+GR 650-A Case Empty.jpg
+GR 650-A Bottom.jpg
+GR 650-A Inside Left.jpg
+GR 650-A Inside Rear.jpg
+GR 650-A Inside Right.jpg
+GR 650-A Inside Top.jpg
+GR 650-A Inside Center.jpg
+GR 650-A Inside Bottom Right.jpg
+</gallery>
 [[Category:Impedance measurement]]
-[[Category:Introduced in 1933]]