October 4, 1965 Electronics
[Table of Contents]
Wax nostalgic about and learn from the history of early electronics.
See articles from Electronics,
published 1930 - 1988. All copyrights hereby acknowledged.
This advertisement for General Radio
Company's Recording Wave Analyzer caught my eye due to the chain-driven interface between
the upper Type 1900-A Wave Analyzer and lower Type 1521-B Graphic Level Recorder chassis.
Maybe that can be considered an early form of the GPIB - General
[Instruments] Physical Interface Bus. I wonder how
many neckties, a rigidly-enforced item of professional dress code of the era, got caught
in those exposed gears? ...or fingers for that matter? OSHA would condemn such a platform
these days. It is not apparent from the photograph whether there is also an electrical
interface. The quality of the printed chart output is phenomenally good for 1965 equipment
- and in color, no less. I also found it interesting that a reference was made to "M.
Fourier," as though maybe Fourier's first name began with an "M," but in fact his full
name is Jean-Baptiste
Joseph Fourier (French), so the "M." would be an abbreviated form of "Monsieur."
General Radio Company Ad
M. Fourier would have liked this Recording Wave
Harmonic components of a 1-kc square wave.
Analysis of a 1-ms pulse with a 20-cycle repetition rate.
Graphic plot of modulation noise on a 1-kc tone for two different types of magnetic
tape. Note that one tape has 10dB less noise. The Recording Analyzer is ideal for this
type of measurement since its 80-dB dynamic range permits uninterrupted recording over
• Three bandwidths let you choose the best selectivity for each measurement ...
3 c/s or 10 c/s for detailed measurements, 50 c/s for rapid analysis or for measurement
of drifting signals. Bandwidth skirts are better than 80-dB down at ±25 c/s, ±80
c/s, and ±500 c/s for 3-, 10-, and 50-cycle bandwidths, respectively.
• Linear frequency scale from 20 c/s to 54 kc/s.
• Two outputs for recording, 100 kc/s with 80-dB dynamic range for inputs above
0.1 V, and 1-mA dc.
• 80-dB dynamic range for recording. You can make uninterrupted recordings ...
no attenuator switching in the midst of measurements.
• High input impedance (1-MΩ) on all ranges.
• Voltage range is 30μV to 300V, full scale, in 15 ranges. Accuracy, ±
(3 % of reading +2% of full scale) .
• As a "Tracking Generator," instrument is both a signal source (delivering 2V
across 600Ω) and a detector tuned to each other exactly.
Type 1910-A Recording Wave Analyzer comes complete with Type 1900-A Wave Analyzer,
Type 1521-B Graphic Level Recorder, and all accessories.
For point-by-point measurements where the recorder is not used, these additional wave
analyzer features add versatility and convenience
• Easy-to-read in-line frequency readout graduated in 10-cycle increments. ±0.5%
calibration accuracy. Output for counter where extreme accuracy is desired.
• Incremental-frequency dial lets you fine-tune any component, covers ±100-cycle
range independently of analyzer setting.
• AFC follows slowly drifting signals.
• Choice of 3 meter speeds - meter does the averaging.
• Excellent tunable filter. For example, the instrument can be used to produce
3-, 10-, and 50-cycle bands of noise over a tunable range from 20 c/s to 54 kc/s when
a random-noise generator is connected to the analyzer.
• Price: Type 1900-A Wave Analyzer alone, $2150; Type 1910-A Recording Wave Analyzer,
$3500 in U.S.A.
We believe M. Fourier's disciples will like this Analyzer, too.
Write for Complete Information.
General Radio Company
In Canada: Toronto 247-2171. Montreal (Mt. Royal) 737-3073
In Europe: Zurich, Switzerland - London, England
West Concord Massachusetts
New York, N. Y., 964-2722
Chicago (Oak Park) 848-9400
(Rideefield. N. J.) 943·3140
Philadelphia (Ft. Washington) 646-8030
Washington, D.C. (Rockville, Md.) 946-1600
Dallas FL 7-4031
San Francisco (Los Altos) 948·8233
Los Angeles 469-6201
Orlando, Fla. 425-4671
Posted October 11, 2018