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Hp 200ABR Hewlett Voltmeter Vacuum Packard Paloalto Audio ...
https://soulevmea.com/hp-200abr-400dr-audio-oscillator
The Hp 331a distortion analyzer is a solid state instrument for measuring and ac voltages. 3 vrms for 100% set level or v db up to 300 may be attenuated reference dc isolation: signal ground can... (posted on June 2nd, 2017)
HP Voltmeters for sale - eBay
https://www.ebay.com/b/HP-Voltmeters/182013/bn_7116657686
HP Model 400A Vacuum Tube Voltmeter - Library of Congress
http://lcweb2.loc.gov/master/mbrs/recording_preservation/manuals/HP%20Model%20400A%20Vacuum%20Tube%20Voltmeter.pdf
model 400a voltmeter, all serial numbers, this manual contains com plete operation and servicing instructions for these voltmeters and should be used in place of the manual originally supplied with each instrument, copyright hewlett-packard company 1960 1501 page mll..l road, palo alto, californla, u.s.a. printed 4/60
Digital Voltmeter 3460B Equipment Hewlett-Packard, HP;
https://www.radiomuseum.org/r/hewlett_pa_digital_voltmeter_3460b.html
Model: Digital Voltmeter 3460B - Hewlett-Packard, HP; Palo Alto Shape Tablemodel, with any shape - general. Dimensions (WHD) 425 x 128 x 543 mm / 16.7 x 5 x 21.4 inch Notes Digital Voltmeter +/-1.00000 to +/-1000.00 Volts in 4 Ranges. Auto-Ranging. Nixie tube readout using tubes specific to HP. Accuracy 0.004% Input impedance 10 Megohms.
HP 8903B Audio Analyzer HP 8903E Distortion Analyzer
https://assets.testequity.com/te1/Documents/pdf/8903b-e.pdf
The HP 8903B Audio Analyzer and HP 8903D Distortion Analyzer provide unparalleled versatility and performance for audio measurements from 20 Hz to 100 kHz. Both instruments combine the functionality of a high-performance distortion analyzer, frequency counter, ac voltmeter, dc voltmeter, and SINAD meter into one compact package.
The -hp- Audio Signal Generators
https://www.hpl.hp.com/hpjournal/pdfs/IssuePDFs/1952-08.pdf
The 30-milliwatt generator is the -hp- Model 206A. This instrument is specifically designed to be used in the most exacting Fig. 1. -hp- Model 206 A Audio Signal Generator operates from 20 cps to 20 kc with less than 0.1% distortion above 50 cps. audio applications and is unquestionably the finest audio test source available commerci ally.
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