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724-B: Difference between revisions
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(Created page with "Type '''724-B Precision Wavemeter'''. ==Specifications== ==Links== ==Photos== <gallery> </gallery> Category:Frequency Standards and Meters") |
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Type | {{GR Product | ||
|model=724-B | |||
|codes=WOMAN | |||
|class=frequency standards and meters | |||
|summary=Precision Wavemeter | |||
|image=GR 724-B Close-Up.jpg | |||
|caption=General Radio 724-B Precision Wavemeter | |||
|series=724 | |||
|introduced=1948 | |||
|discontinued=1954 | |||
|designers= | |||
|manuals= | |||
* [[Media:GR 724-B Wavemeter Data Cards SN2062 12_1951.pdf|General Radio 724-B Precision Wavemeter Data Cards SN2062 1951]] | |||
{{Catalog History}} | |||
}} | |||
The {{Title|General Radio 724-B Precision Wavemeter}} were introduced in {{Catalog L}} and remained available through {{Catalog N}}. | |||
The Type 724-B is an absorption type wavemeter whose range is from 17 kHz to 50 MHz using seven coils with an accuracy of ±0.25%. The primary application of the 724-B is oscillator and transmitter frequency measurement. Resonance is achieved using one of three methods, absorption method or reaction method and beat method. Using the panel microammeter the the absorption method is employed. Regardless of the method, once resonance is achieved its a matter of using the correct chart for the coil in use to determine the frequency. The Type 724-B is supplied as a collection of calibrated components sharing the same serial number. That is the capacitor, all the inductors, and calibration charts must have the same serial number to achieve the stated accuracy. The 724-B replaced the [[724-A]] Wavemeter. The principle difference is the earlier version used a vacuum tube rectifier while 724-B uses 1N34 crystal rectifier. The "A" verison required a battery, the "B" version does not. The wavemeter is furnished with wooden storage case, fitted with lock and carrying handle. This case has compartments for holding the capacitor, inductors, | |||
and calibration charts. | |||
==Specifications== | ==Specifications== | ||
* '''Frequency Range:''' 17 kHz to 50 MHz using seven inductors | |||
* '''Accuracy:''' ±0.25% | |||
* '''Inductors:''' 7 coils wound on isolantite formsand enclosed in molded phenolic cases | |||
* '''Capacitor:''' Precision worm-drive type similar to Type 722 | |||
* '''Resonance Indicator:''' microammeter and 1N34 crystal rectifier combination | |||
==Links== | ==Links== | ||
* [[Media:GR Exp 724-B 03_1947.pdf|Experimenter March 1947 describing Type 724-B]] | |||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
GR 724-B Front.jpg | |||
GR 724-B Storage Closed.jpg | |||
GR 724-B Storage Open.jpg | |||
GR 724-B Storage Close-Up.jpg | |||
GR 724-B Storage Coils.jpg | |||
GR 724-B Storage Capacitor.jpg | |||
GR 724-B Wavemeter Contents.jpg | |||
GR 724-B Cards.jpg | |||
GR 724-B Coil Set SN2062.jpg | |||
GR 724-B Coil Set SN2062 GR 774 Connector.jpg | |||
GR 724-B Capacitor Case Top.jpg | |||
GR 724-B Capacitor Case Left.jpg | |||
GR 724-B Capacitor Case Bottom.jpg | |||
GR 724-B Capacitor Case Empty.jpg | |||
GR 724-B Capacitor InsideTop A.jpg | |||
GR 724-B Capacitor InsideTop B.jpg | |||
GR 724-B Capacitor Inside Left.jpg | |||
GR 724-B Capacitor Inside Rear.jpg | |||
GR 724-B Capacitor Inside Right.jpg | |||
GR 724-B Capacitor Inside Bottom B.jpg | |||
GR 724-B Card 1.jpg | |||
GR 724-B Card 2.jpg | |||
GR 724-B Card 3.jpg | |||
</gallery> | </gallery> | ||
[[Category:Frequency Standards and Meters]] | [[Category:Frequency Standards and Meters]] | ||