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Distortion Analyzer 320B

Distortion Analyzer 320B; Hewlett-Packard, HP; (ID = 1307071) Equipment Distortion Analyzer 320B; Hewlett-Packard, HP; (ID = 2293687) Equipment
Distortion Analyzer 320B; Hewlett-Packard, HP; (ID = 2293688) Equipment Distortion Analyzer 320B; Hewlett-Packard, HP; (ID = 2293689) Equipment
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Distortion Analyzer 320B; Hewlett-Packard, HP; (ID = 1307071) Equipment
Hewlett-Packard, HP;: Distortion Analyzer 320B [Equipment] ID = 1307071 764x437
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For model Distortion Analyzer 320B, Hewlett-Packard, (HP); Palo Alto, CA:
Source: HP Catalog 18A
 
Country:  United States of America (USA)
Manufacturer / Brand:  Hewlett-Packard, (HP); Palo Alto, CA
Year: 1945 ? Category: Service- or Lab Equipment
Main principle none
Wave bands - without
Details
Power type and voltage Alternating Current supply (AC) / 115 Volt
Loudspeaker - - No sound reproduction output.
Power out
from Radiomuseum.org Model: Distortion Analyzer 320B - Hewlett-Packard, HP; Palo Alto
Material Wooden case
Shape Tablemodel, with any shape - general.
Dimensions (WHD) 13 x 9 x 8 inch / 330 x 229 x 203 mm
Notes

The 320B is designed for measurement at frequencies of 50, 100, 400, 1000, 5000, and 7500 cps.
Filters of other frequencies can be supplied on special order.
Input Impedanz: is at least 20 kOhm. A bridging transformer may be used to increase the input impedance.
Attenuator: It consits of a 60 db unit adjustable in 10 db steps.
Distortion Range: more than 60 db of attenuation of the fundamental. Values as low as 0.1% of the fundamental may be measured with a detector of sufficient sensitivity.

see also -hp- Distortion Measuring Equipment

Net weight (2.2 lb = 1 kg) 17.5 lb (17 lb 8 oz) / 7.945 kg
Price in first year of sale 150.00 USD
Source of data -- Original prospect or advert

Model page created by Pius Steiner. See "Data change" for further contributors.



All listed radios etc. from Hewlett-Packard, (HP); Palo Alto, CA
Here you find 355 models, 322 with images and 124 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


 


Forum contributions about this model
Hewlett-Packard, HP;: Distortion Analyzer 320B
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hewlett-pa: 320B; Distortion Analyzer 320
Pius Steiner
23.Sep.12
  1

MODEL 320  DISTORTION ANALYZER

"From HP Catalog 18A" Laboratory Instruments", Copyrighted 1945."


ADVANTAGES:
Time-saving
Available for any frequencies from 50 cps to 20 kc
Measures harmonic distortion directly
Accurate

USE IT TO:
Compare distortion content of wave with fundamental voltage
Observe type as well as amount of distortion (with oscilloscope)
Speed production testing
Attenuate voltages and signals—range zero to 70 db

 


THIS CIRCUIT SHOWS TYPE AND AMOUNT OF DISTORTION

The -hp- Model 320 Distortion Analyzer is a simple and convenient device for studying and measuring the harmonic distortion in audio frequency apparatus. The instrument is particularly suitable for development work, in as much as the character and type of distortion can be determined at the same time that the distortion is being measured. In addition, the instrument is excellent for production work because it is easy to operate and provides a rapid and accurate check for normal operation. Essentially, the Model 320 is a comparison device; it is used to compare the distortion content of a wave with the applied wave itself.

When this comparison is made in conjunction with a cathode ray oscilloscope, the type of distortion can be observed readily. The various order harmonics will show up in the oscilloscope pattern together with hum and noise voltages, so that a great deal of information about the voltage being analyzed can be obtained. For this reason, the Model 320 is a valuable instrument, not only when used alone, but also when used in combination with other equipment which measures the total rms distortion directly.

If more accurate measurements are desired than can be obtained with an oscilloscope, a sensitive voltmeter, such as the -hp- Model 400A, can be used as the detector. With such a meter the distortion measurements may be made with as good accuracy as can be obtained with the more expensive distortion meters.

The Model 320 Distortion Analyzer consists of fundamental elimination filters combined with a calibrated attenuator reading in decibels.

When the voltage to be analyzed is adjusted to the proper frequency, the fundamental is eliminated completely by the filters. The residual voltage containing the harmonics can then be observed with an oscilloscope or measured with a sensitive meter. When the level has been noted, a calibrated attenuator is substituted for the elimination filter. The attenuator is then adjusted until the same indication is obtained on the detector as with the filter in the circuit. When this condition is obtained, the distortion level is the number of decibels below the applied wave indicated by the setting of the attenuator.


MODELS

Two models of the -hp- Model 320 are available. The Model 320A is designed for measurement at frequencies of 400 and 5000 cps, while the Model 320B is designed for measurement at frequencies of 50, 100, 400, 1000, 5000, and 7500 cps. All filters are designed to "provide more than 60 db of attenuation of the fundamental, so that distortion measurements may be made down to 0.1%.


SPECIFICATIONS

Frequency Range: The Model 320A is designed for measurements at 400 and 5000 cps. The Model 320B is designed for measurements at 50, 100, 400, 1,000, 5,000, and 7500cps. Filters for other frequencies can be supplied on special order.

Input Impedance: The input impedance is at least 20,000 ohms. A bridging transformer may be used to increase the input impedance.

Attenuator: An attenuator is provided to compare the amplitude of the harmonic voltages with the fundamental. It consists of a 60 db unit adjustable in 10 db steps and a 10 db unit adjustable in 1 db steps. Individual resistors adjusted to ±½%.

Distortion Range: The filter circuits will provide more than 60 db of attenuation of the fundamental. Distortion values as low as 0.1% of the fundamental may be measured with a detector of sufficient sensitivity.

Detector Sensitivity: The sensitivity of the instrument is determined by the detector. The detector should give a readable indication on 0.1% of the fundamental if harmonics of 0.1% are to be measured. The detector need not be calibrated because it is used for comparison only. The usual oscilloscope with a one stage amplifier is sufficiently sensitive to measure 0.3% of a 30 volt fundamental. For proper operation of the instrument the input impedance of the detector must be 100,000 ohms or greater. An amplifier may be used between the instrument and the detector to increase the sensitivity. The only requirements on such an amplifier are that it must pass the highest harmonic which is of interest, and that it have a high impedance input. It need not be free from distortion otherwise.

Mounting: The Model 320A and 320B are mounted in attractive oak cabinets with the panel finished in wrinkle gray. The Models 320AR and 320BR fit the standard 19" relay rack with ¾" spacing. The panels are finished in wrinkle gray with machine engraved designations.

Size, Net Weight, Shipping Weight
320A    13" x 9" x 8"   15 pounds 22 pounds
320B    13" x 9" x 8"   17 ½ pounds 28 pounds
320AR 19" x 9" x 8"   17 pounds 32 pounds
320BR 19" x 9" x 8"   19 ½ pounds 35 pounds


 
Hewlett-Packard, HP;: Distortion Analyzer 320B
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