Equipment information
General Radio Company 760-B Analyzer
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Model:
760-B
Date:
1953
Category:
Group:
Description:
Sound Analyzer
Information
The Type 760-B Sound Analyzer is intended primarily for use
with the Type 1551-A or Type 759-B Sound-Level Meter to
separate complex sounds and noises into their various
frequency components. It is also useful as a general-purpose
laboratory harmonic analyzer, and can be used as a
frequency- selective bridge detector for audio frequencies.
The band width of the Analyzer is a constant percentage of
the frequency to which the Analyzer is tuned.
Frequency Range: Calibrated directly in cycles per second
from 25 to 7500. This total range is covered in five
complete turns of the tuning knob, the ranges on the various
dial rotations being 25 to 75, 75, to 250, 250 to 750,
750 to 2500, and 2500 to 7500 cycles. A push-button switch
allows immediate change of the main control to any one of
these ranges.
Frequency Calibration: The accuracy of frequency calibration
is +1-1/2% of the frequency to which the dial is set or
+1-1/2 cycles per second, whichever is the larger.
Voltage Range: The Analyzer will give usable indications on
input voltages ranging from 1 millivolt to 10 volts. The
meter scale is calibrated for reading directly component
tones down to 1% of the sound pressure (or voltage) of the
fundamental or loudest component. Accordingly, to make full
use of this feature, the input voltage at the loudest
component or fundamental should be 0.1 volt or higher.
Input Impedance: The input impedance is between 20,000 and
30,000 ohms, depending upon the setting of the sensitivity
control. A blocking capacitor is in series with the input.
Frequency Response: The response is flat within +2 db over
the entire range. At points where two ranges overlap, the
sensitivity is the same on either range, within +1 db.
BandWidth: The average selectivity is such that the relative
attenuation is 3 db at 1% off the peak to which the Analyzer
is tuned.
Temperature and Humidity Effects: Under very severe
conditions of temperature and humidity only slight, and
generally negligible, shifts in calibration, sensitivity,
and band width will occur.
Meter: The indicating meter is calibrated in two ranges. The
nominal ranges are 0 to - 30 db and -14 to -40 db. For
convenience in use the meter scale is calibrated with the
nominal range located 2 db below full scale on the meter, so
that actual meter scales are +2 to -30 db and -12 to -40 db.
Auxiliary percentage ranges of 0 to 120% and 0 to 24% are
provided.
Headphones: A jack is provided on the panel for plugging in
a pair of head telephones, in order to listen to the actual
component of the sound to which the instrument is tuned.
This is also useful when the Analyzer is used as a
bridge-balance indicator.
Tubes: Three 1L4 and one 1U4 tubes are used together with a
neon pilot light (NE-51). All are supplied.
Batteries: The batteries required are four Burgess No. 2FBP
1.5-volt batteries, or the equivalent, and three Burgess No.
Z30NX 45-volt batteries, or the equivalent. A compartment is
provided in the case of the Analyzer for holding all
batteries, and connections are automatically made to the
batteries when the cover of this compartment is closed. A
set of batteries is included in the price of the instrument.
Accessories Supplied: A shielded cable-and-plug assembly for
connecting the Analyzer to the sound-level meter.
Case: The Analyzer is built into a shielded carrying case of
airplane-luggage construction.
Dimensions: (Length) 18 x (width) 10 x (height) 11-1/2
inches, overall.
Net Weight: 36-1/2 pounds, with batteries; 29-3/4 pounds,
without batteries.
Manual Type:
Service and User Manual
Pages:
16
Size:
6.80 Mbytes (7125928 Bytes)
Language:
english
Revision:
Manual-ID:
695-D
Date:
1953 01 01
Quality:
Scanned document, all readable.
Upload date:
2016 12 30
MD5:
897fcd1f5527a3697c1d76073094498d
Downloads:
432