General Radio 1564-A, 1564-9820, 1911-A, 1560 P5, 1560 P6, 1560 P52, 1560 P41, 1560 P40, 1560 P40H, 1560 P40J, 1560 P40K, 1552 B, 1557 A, 1551 C, 1553 A, 1521 B, 1531 A, 1560 P35, 1560 P76, 1564 2020, CAP 22 Instruction Manual

INSTRUCTION MANUAL

TYPE

1564-A

SOUND AND VIBRATION

ANALYZER

G E N E R A L R A D I O C O M P A N Y

D

INSTRUCT ION MANUAL

TYPE

1564-A

SOUND AND VIBRATION

ANALYZER

Form 1564-0 100-D

ID Number 1423

February 1967

Copyright 1964 by General Radio Company

West Concord, Massachusetts, USA

GENERAL R A D I O C O M P A N Y

WEST CONCORD, MASSACHUSETTS, USA

TABLE OF CONTENTS

Section 1 INTRODUCTION

1.1

Purpose

1.2 Description

1.3 Controls and Connectors

1.4 Carrying Case

1.5 Accessories Supplied .

1.6 Accessories Available .

Section 2 OPERATING PROCEDURE .

2.1 Opening the Flip-Tilt Case

2.2 Power Supply .

2.3 Calibration

2.4 Operation with Type 1560-P5 Microphone or Type 1560-P6

Microphone Assembly .

2.5 Use of the Type 1552-B Sound-Level Calibrator

2.6 Effect of Presence of Observer and Instrument Case .

2.7 Operation with Type 1560-P52 Vibration Pickup

2.8 Use with Type 1557-A Vibration Calibrator .

2.9 Determination of Velocity and Displacement from

Acceleration Measurements .

2.10 Use with a Stroboscope

2.11 Operation as a Tuned Voltmeter

2.12 Operation with a Sound-Level Meter

2.13 Operation with a Vibration Meter .

2.14 Operation with Type 1560-P40 Preamplifier.

2.15 Background Level

2.16 Choice of Meter Speeds

2.17 All-Pass Frequency Response and Effects of Microphone and Vibration Pickup

2.18 Operation with Type 1521 Graphic Level Recorder

Section 3 PRINCIPLES OF OPERATION

3.1 General.

3.2 Preamplifier Section

3.3 Filter Section.

3.4 All-Pass Amplifier .

3.5 Output Amplifier Section

3.6 Calibration Network

3. 7 Power Supply •

Section 4 SERVICE AND MAINTENANCE

4.1 General.

4.2 Removal of Instrument from Case

4.3 Transistor Voltages

4.4 Internal Noise

4.5 Serviceability Test

4.6 Filter Realignment

PARTS LISTS AND SCHEMATICS

APPENDIX .

10

10

11

11

12

13

14

14

7

8

9

9

10

17

17

19

21

21

23

24

25

26

26

27

27

27

27

28

29

30

33

39

1

1

1

2

'}

3

3

5

5

5

6

SPECIFICATIONS

FREQUENCY

Range:

From 2.5 cps to 25 kc in four decade ranges.

Dial Calibration:

Logarithmic.

Accuracy of Calibration:

Filter Characteristics:

±2% of frequency-dial setting.

Noise bandwidth is either 1/3 octave (23%) or 1/10 octave (7%).

One-third-octave characteristic has at least 30-db attenuation at onehalf and twice the selected frequency (see Figure 3-3, page 23). One-tenth· octave characteristic has at least 40-db attenuation at one-half and twice the selected frequency. Ultimate attenuation is greater than 70 db for both characteristics.

For both bandwidths peak response is uniform ±1 db from 5 cps to 10 kc and ±1.5 db from 2.5 cps to 25 kc.

INPUT

Impedance:

ting).

25 megohms in parallel with 80 pf (independent of attenuator set-

Voltage Range:

0.3 millivolt to 30 volts full scale in 10-db steps.

OUTPUT

Voltage:

At least 1 volt open circuit when meter reads full scale.

Impedance:

6000 ohms. Any load can be connected.

Meter:

Three scales, 0-3 volts; 0-10 volts; -6 to +10 db.

Recording Analyzer:

Automatic range switching at the end of each frequency decade allows convenient continuous recording of spectra with the Type

1521 Graphic Level Recorder.

GENERAL

Amplitude Calibration:

Built~in, feedback-type calibration system permits amplitude calibration at any frequency.

Detector:

Quasi-rms with three averaging times. Faster two speeds conform with ASA standard for sound-level meters.

Power Requirements:

Operates from 115 (or 230) volts, 50-60 cps, or from nickel-cadmium battery supplied. Battery provides 25 hours of operation when fully charged and requires 14 hours for charging.

Accessories Supplied:

Type CAP-22 Power Cord, shielded cable, and Type

1564-2020 Detented Knob-and-Dial Assembly.

Accessories Available:

Type 1560-P6 Microphone Assembly or Type 1560-P5

Microphone for direct acoustic pickup; Type 1560-P52 Vibration Pickup for solid-borne vibrations; Type 1560-P41 Audio-Frequency Voltage Probe for voltage measurements; Type 1560-P40 Preamplifier and accessories.

Cabinet:

Flip-Tilt; relay-rack model also is available.

Dimensions:

Portable model, case closed -width 10-1/4, height 8-1/8, depth

8 inches (260 by 210 by 205 mm), over-all; rack model -panel 19 by 10·1/2 inches (485 by 270 mm), depth behind panel 6 inches (155 mm).

Net Weight:

(7.5 kg).

Portable model, 14-1/2 pounds (7 kg); rack model, 15·1/2 pounds

Shipping Weight:

~14 kg).

Portable model, 23 pounds (10.5 kg); rack model, 30 pounds

U.S.

Patent Nos.

3,012, 197, 0187,740, 2,966,257.

General Radio

Experimenter

reference: Vol. 37, Nos. 9, 10, pp. 1-9, Sept-Oct,

1963.

Type 1564-9820 Sound and Vibration Analyzer for relay-ra ck mounting.

Figure 1-1. Type 1564-A Sound and Vibration Analyzer. Below are shown three views of the in s trument in various positions, with some of the accessories available (see text).

INTRODUCTION

Section 1

INTRODUCTION

1.1 PURPOSE.

The Type 1564-ASoundandVibration Analyzer, Figure 1-1,is a portable instrument for the frequency analysis of voltages having components between 2.5 cps and 25 kc. The high input impedance of the analyzer permits the direct connection of piezoelectric transducers for the analysis of highlevel acoustical spectra. For low levels, the analyzer can be operated in conjunction with a sound-level meter or a vibration meter. Designed for either manual or automatic tuning, the analyzer can be used with a graphic level recorder, such as the General Radio Type 1521, to produce continuous plots of level as a function of frequency.

1.2 DESCRIPTION.

The analyzer consists of three basic sections: preamplifier, filter, and output amplifier. The preamplifier section contains the amplification and attenuation necessary to change the input signal to a level convenient for filtering. Two cascaded resonant sections are used in the filter. These are either synchronously tuned to produce a bandwidth of 1/10 octave, or frequency-staggered to give a 1/3-octave bandwidth. The output amplifier section consists of amplifiers, 10-db-step attenuators, and a meter. The signal from the filter is amplified and is then used to drive the meter and to supply an output signal to a recorder, headphones, or other device.

The analyzer is continuously tunable from 2.5 cps to 25 kc in four decade ranges. It indicates voltages between 50 flVOlts and 30 volts. Used with the accessory Type 1560-P6 Microphone Assembly or Type 1560-PS

Microphone, it indicates sound-pressure levels directly, between 44 db and 150 db re 2 x 10-4 f.Lbar. With an accessory vibration pickup, Type

1560-P52, the analyzer measures acceleration from .0007 to 100 g.

Power for the analyzer is supplied by a US- or 230-volt, 50- to 60cycle line or by an internal, rechargeable, nickel-cadmium battery.

Both portable (Type 1564-A) and relay-rack-adapted (Type 1564-9820} models of the analyzer are available (see Figure 1-1}.

The Type 1911-A Recording Sound and Vibration Analyzer, consisting of the Type 1564-A Sound and Vibration Analyzer and the Type 1521-B

Graphic Level Recorder, with accessories, is also available.

1.3 CONTROLS AND CONNECTORS.

The following controls and connectors are on the Sound and Vibration Analyzer:

NAME

BAND LEVEL

(Gray knob)

BAND LEVEL

(Knurled dial)

FREQUENCY

FREQUENCY

MULTIPLIER

None

(Detent arm)

BANDWIDTH

None

(Function switch)

CAL

INPUT

OUTPUT

Power cord receptacle

115 v, 50-60 cps

TYPE

6-position rotary switch


Continuous rotary control and dial

8 -position rotary switch

Nickel-plated arm, with finger


FUNCTION

Adjusts gain of output amplifier in 10-db steps and indicates meter range.

Adjusts level of input to filter in

10-db steps and indicates meter range.

Adjusts and indicates the geometric center frequency of the filter.

Selects the frequency range and indicates the frequency multiplier.

Engages detent at ASA -preferred frequencies.

Selects filter bandwidth.


Rotary thumbset control

Three-terminal Cannon

Type XLR locking socket paralleled by phone jack

Phone jack

3 -terminal male connector

Turns instrument on and OFF.

Selects meter speed q.nd mode of operation (CAL, CK BAT, or

CHARGE).

Adjusts gain for calibration.

Input connectors for either standard microphone plug or phone plug.

Supplies 1 volt open circuit for full-scale meter indication (6000 ohms output impedance).

Input connector for line voltage, to operate instrument or charge battery.

1.4 CARRYING CASE.

The portable model of the analyzer is mounted in a Flip-Tilt case.

The captive, protective cover serves as a mounting base when the instrument is in use. The friction of the rubber seal keeps the instrument at any convenient angle, from horizontal to vertical. Accessories, such as the Type

1560-P52 Vibration Pickup or the Type 1560-P4I Audio Frequency Voltage

Probe, can be stored in the polyurethane compartment in the cover.

2

INTRODUCTION

1.5 ACCESSORIES SUPPLIED.

The following accessories are supplied with the Type 1564-A Sound and Vibration Analyzer:

1 Type1560-P76Cable Assembly to connectto the output of a soundlevel meter or vibration meter;

1 Type 1564-2020 Detented Knob-and-Dial Assembly, for use when the Type 1564-A Sound and Vibration Analyzer is used with the

Type 1551-C Sound-LevelMeteror withthe Type1553-A Vibration

Meter.

1 Type CAP-22 Power Cord.

1.6

ACCESSORIES AVAILABLE.

1.6.1 TYPES 1560-P5 MICROPHONE AND1560-P6 MICROPHONE ASSEMBLY

(Figure 1-2). The Type 1560-P5 Microphone is a piezoelectric ceramic

Unit, mounted on a standard Cannon -type male connector. It can be plugged directly into th e analyzer, or it can be connected to it by means of a length of shielded cable.

The Type 1560-P6 Microphone Assembly uses the same cartridge attached to a short length of flexible conduit. The assembly plugs directly into the INPUT connector on the panel of the analyzer.

Complete specifications for the Types 1560-P5 and 1560-P6 Microphones are given in the Appendix.

1.6.2 VIBRATION PICKUP SYSTEMS. Three v ibration pickup systems are available; they differ in frequency range, sensitivity and impedance. Specifications for each of these systems (Types 1560-PllB, 1560-P13, and

1560-P14) are given in the Appendix.

1.6.3 TYPE 1560-P41 AUDIO FREQUENCY VOLTAGE PROBE. The Type

1560-P41 Audio-Frequency Voltage Probe is designed to permit voltage measurements on high-impedan ce c ircuits at a distance of about four feet from the analyzer. It consists of a 10-

Figure 1-2.

to-1, resistance-capacitance vo ltag e divider enclosed in an insulated aluminum casing. A shielded cable from the divider t erm inates in a microphone

Type 1560-P6

connector that mates with the connector on the panel of the analyzer. Figure

1-3 shows the probe and the various tips that are supplied with it. The input impedance of th e probe is 25 megohms in parallel with 20 pf, when the probe

Type 1560-P5

is connected to the analyzer. The probe attenuates the applied signal by 20 db.

Therefore, the indicated voltage must be multiplied by ten.

3

~ T YP E

1 56 4-A SO U ND AND VI BR ATI O N ANALYZER

4

•

Figure 1-3.

Type 1560 P4 1 Audio-

Frequency Voltage

Probe is supplied with a varie t y of p r obe t ips.

1.6.4 TYPE 1560 P40 PREAMPLIFIER. The Type 1560 P40 Preamplifier

(Figure 1 4) is a high-input impedance, low noise preamplifier . It is particularly well suited for amplifying the output of piezoelectric trans ducers such as microphones and vibration pickups , and for driving long connecting cables without loss in signal voltage . A switch on the preamp lifier provides a voltage gain of either 1:1 or 10:1.

Complete specifications are given in the Appendix .

The amplifier is housed in a small cylindrical case. The Type

1560-P5 Microphone cartridge plugs directly on to the input end of the case.

Adaptors are available for connecting the preamplifier to the cartridge of the Type 1560 P3 Microphone, to GR874 Connectors, and to 3 termina l microphone connectors. Output from the preamplifier is through a 3 ter minal shielded connector. The required de supply voltage is applied from one of these terminals to ground. This voltage can be obtained directly from the Type 1564 A Analyzer.

The preamplifier and accessories are available in various combinations (refer to the Appendix).

The Type 1560-P40H Preamplifier and Power Supply Set is self powered and independent of any external supply.

The Type 1560-P40J Preamplifier and Adaptor Set is dependent for its power on the instrument to which it is connected, so that it should be u sed with the Type 1558 or 1564 Analyzer.

The Type 1560P40K Preamplifier and Microphone Set is for use with the Types 1558 and 1564 Analyzers when an acoustical measurement is needed at low levels and the microphone must be mounted at the end of a cable.

Figure 1-4.

Microphone

Cartridge

Adaptor to

3-terminal

Aiicrophone

Connector

OPERATING PROCEDURE

Section 2


2.1

OPENING THE FLIP-TILT CASE.

Directions for opening the Type 1564-A Sound and Vibration Analyzer are given on the handle of the Flip-Tilt case. Once open, the instrument can be tilted to any convenient angle, as shown in Figure 1-1. The instrument should be placed to give the most convenient access to the knobs and the best view of both the panel control settings and the meter indication.

The case can be locked fully open by means of the same slide pins that are used to lock it when it is closed. It can be carried in the open position, with the cover firmly in place.

2.2

POWER SUPPLY.

2.2.1 GENERAL. The Type 1564-A Sound and Vibration Analyzer can be operated from a US-volt, 50- to 60-cycle line, from a 230-volt, 50- to 60cycle line, or from its self-contained, rechargeable, nickel-cadmium battery. Normally supplied for US-volt operation and charging, it is easily converted for use on a 230-volt line by changing the connections to the power transformer, as shown on the schematic diagram, Figure 4-2.

2.2.2 CHARGING THE BATTERY. To check the battery, turn the function switch to CK BAT. The meter should read in the area marked BAT. The battery will require charging after about 25 hours of operation.

To charge the battery, connect theType CAP-22 Power Cord from the line to the three-prong connector on the right side of the case. The nameplate above the connector indicates the line voltage and frequencyforwhich the analyzer is wired. Turn the function switch to CHARGE, and allow 14 hours to charge the battery fully.

2.2.3 OPERATION FROM THE LINE. Connect the analyzer to the line as in paragraph 2.2.1. With the function switch at CK BAT, the meter should read in the area marked BAT. The line now supplies power to operate the instrument; no charging is necessary.

5

CAUTION

The function switch must be used to turn off the instrument. Do not disconnect the line by external means only. If this is done, the instrument will continue to opeTate with battery power. Then it may be necessary to charge the battery for an hour or more before line operation can be resumed.

2.3 CALIBRATION .

The analyzer contains a built-in reference for gain cal ibrati on. The reference can be adjusted by means of an internal control (see Figure 2 -1) which can be set in one of three ways, depending upon whether the analyzer is to be used with a microphone, with a vibration pickup, or as a voltmeter.

The outer scale of this co ntrol is calibrated in db re 1 volt/fJbar microphone sensitivity. Set this scale to indicate the sensitivity of the piezoelectric microphone to be used. The control is set in the General Radio laboratory to match the sensitivity of the microphone, if one is supplied with the anal yzer. If the microphone is not ordered with the instrument, the control is set to the REF line. This setting is for operation with a Type 1560- PS2

Vibration Pickup or for use as a voltmeter, with or without the probe. The instrument can be made direct-reading in open-circuit volts for low-capacitance piezoelectric accelerometers by setting the dial to the' engraved dot that corresponds to the capacitance of the accelerometer. These dots, en graved 8, 4, and 2, Figure 2 2, correspond to capacitance values of 800,400, and 200 pf, respectively. The REF position on the dial is used for capacitance values above 4000 pf.

BAND LEVEL

5101,5102

6

Fi gure 2-1. Interior vieu, of anal yze r.

OPERATING PROCEDURE

Figure 2-2. Dial for internal gaincalibration control.

2.4 OPERATION WITH TYPE 1560-PS MICROPHONE OR TYPE 1560-P6 MICROPHONE

ASSEMBLY.

2.4.1 CALIBRATION. Make the followingcheck on the amplifier gainbefore using the analyzer. This check is valid only when the internal calibration control is set according to the instructions in paragraph 2.3. a. Set the BANDWIDTH switch to ALL PASS. b. Set the white dots on both BAND LEVEL controls (knob and dial) at the top (12 o'clock). c. Turn the function switch to CAL and allow 30 seconds for the instrument to stabilize.

The meter should now indicate in the area marked CAL. If it does not, adjust it by means of the panel thumbset control marked CAL.

The analyzer is now calibrated for direct reading in db re 2 x 10- 4 flbar, rms sound-pressure level. For some critical applications, this calibration can be repeated in a 1 /3- or 1/10- octave band, at any selected frequency up to 10 kc.

NOTE

The calibration system is such that, with the function switch at CAL, a gain variation, as indicated by the meter, is ten times the actual gain variation. Therefore, when the analyzer is switched from ALL PASS to 1/3 OCTAVE or to 1/10 OCTAVE, the meter may indicate outside the CAL area. Also, tuning the analyzer in the CAL mode may cause the meter to vary over its entire scale, indicating a gain variation of about 1.5 db.

2.4.2 MEASUREMENT PROCEDURE. a. Connect the microphone to the panel INPUT connector. Detents are provided in the connector of the Type 1560-P6 Microphone Assembly to hold it in place. The latter connector can be turned through 180°.

7

b. Turn both BAND LEVEL controls fully clockwise. c. Set the BANDWIDTH switch to ALL PASS. d. Set the function switch for the desired meter response, FAST or

SLOW (refer to paragraph 2.17). Allow 30 seconds for the instrument to stabilize. e. If the meter indicates above +1 0 db, turn the BAND LEVEL knurled dial to obtain an on-scale meter reading. If the meter indicates below -6 db, adjust the BAND LEVEL gray knob until a meter indication above this value is obtained. The ALL-PASS sound-pressure level, in db re 2 x I0-4 flbar, is the algebraic sum of the readings on the outer, red scales of both the meter and the BAND LEVEL indicator. f. Select the desired BANDWIDTH and FREQUENCY. A detent arm, located above the FREQUENCY knob, can be engaged to provide detents at the ASA-preferred frequencies (indicated on the tuning dial by white dots).

To engage the arm,loosen the thumbscrew that fastens it to the panel. Slide the arm toward the knob by means of its protruding finger; then rotate the knob until the arm drops into its slot and tighten the thumbscrew.

The detent can be adjusted so that it selects any desired series offrequencies that are separated by 1/3 octave. First, engage the detent arm; then push the FREQUENCY knob toward the top of the instrument as far as it will go. Hold the knob in this position and turn the dial to any frequency in the desired series. Then release the knob. g. Adjust the BAND LEVEL gray knob to obtain an on-scale meter deflection. The sound-pressure levelin the band selected, in db re 2 x I0-4

Jlbar, is the algebraic sum of the meter and BAND LEVEL indicator readings. Special chart paper for plotting 1/3-octave band levels is available from Codex Book Company, Inc., Norwood, Massachusetts (Codex #31,462).

CAUTION

Improper use of the BAND LEVEL controls can overload the preamplifier and introduce errors.

Always measure the ALL PASS level before ana· lyzing. Never readiust the BAND LEVEL dial when you are analyzing. The procedure given in paragraph 2.4.2 ensures that the preamplifier is not overloaded and it allows the entire potential analyzing range of the instrument to be realized.

2.5

USE OF THE TYPE 1552-B SOUND-LEVEL CALIBRATOR.

The calibrator of the Type 1564-A Sound and Vibration Analyzer does not check the microphone. For a calibration of the microphone-analyzer combination, the Type 1552-B Sound- Level Calibrator is recommended. This calibrator includes a closed coupler and a driving loudspeaker, which produce a known sound-pressure level at the microphone. (Refer to the Operating Instructions for the calibrator.)

8


2.6 EFFECT OF PRESENCE OF OBSERVER AND INSTRUMENT CASE.

Except in reverberant fields, the presence of the observer and the instrument case can disturb the sound field and introduce significant errors1.

To minimize this effect when the Type 1560-P6 Microphone Assembly is used, adjust the gooseneck assembly so that the microphone is located as far as possible from the observer and the instrument. The observer should stand with the analyzer in front of him, and with the sound source at his side. For greatest accuracy, mount the microphone (Type 1560-P5 or -P6) on a tripod and connect it to the analyzer by means of an extension cable.

The observer and the instrument are thus removed from the sound field.

Place the microphone so that the angle of sound incidence is 70° with respect to the microphone axis. This gives a response that corresponds to the random -incidence response.

2.7 OPERATION WITH TYPE 1560-P52 VIBRATION PICKUP.

2.7.1 CALIBRATION. Tocalibrate the analyzer forusewith the Type 1560-

P52 Vibration Pickup, set the internal calibration control of the analyzer to

REF and proceed as in paragraph 2.4.1. The analyzer is now set to indicate the rms value of the open-circuit pickup voltage.

2.7.2 PLACEMENT OF PICKUP. The design of the pickup enables it to be held in place against the vibrating object in any of several different ways.

The preferred method is to attach it rigidly to the object with screws through the holes provided in the pickup or with a single screw threaded into the tapped center hole (1 /4 - 28). Or the General Radio Type 1560- P35 Permanent-MagnetClamp canbe used. This is a disk-shaped magnet with a captive screw that can be threaded into the tapped center hole in the pickup.

If the vibrating object is flat and the level of vibration is low, the pickup can simply rest on the object.

For hand-held operation, either the round or the conical tip (both supplied with the pickup) can be used. These tips screw directly into the pickup or into the end of the six-inch probe which, in turn, screws directly into the pickup. Grasp the pickup (not the probe), and press it against the vibrating object only hard enough to prevent chatter. Hand-held operationis convenient and is recommended for exploratory measurements. However, the pickup should be firmly attached to the vibrating object if accurate results are desired.

2.7.3 MEASUREMENT PROCEDURE. Followtheinstructionsgiveninparagraph 2.4.2, steps b through g, but read the black, VOLTS, meter scale that corresponds to the setting of the BAND LEVEL control. The fullscale voltage sensitivityof the analyzer is indicated bythe reading of the inner, black scale of the BAND LEVEL control. To convert the indicated voltage to acceleration in g's or inches/sec2, divide by the sensitivity of the pickup in v /g or v/inch/sec2, respectively. (Note: g

=

386 inches/sec2.)

1

R. W. Young, "Can Accurate Measurements be Made with a Sound-Level Meter Held in

Hand?" SOUND, 1, 1, 17-24, January-February, 1962.

9

+.TYPE 1564-A SOUND AND VIBRATION ANALYZER

2.8 USE WITH TYPE 1557-A VIBRATION CALIBRATOR.

The Type 1557-A Vibration Calibrator can be used to obtain an overall amplitude calibration at 100 cps. The calibrator is a self-contained electromechanical shaker that produces an acceleration of one g, rms, at a frequency of 100 cps with loads ranging from zero to 300 grams. The

Type 1564-A Sound and Vibration Analyzer shouldindicate the sensitivity of the pickup being used multiplied by g. For example, for a 75 mv /g pickup, the analyzer should indicate 75 mv /g x g = 75 mv. If it does not, use the level indicated when converting from volts to g's. That is, if the analyzer indicates 60 mv, the sensitivity of the system (pickup and analyzer) is 60 mv /g. If a measurement shows a level of 1 volt, the corresponding acceleration is

1000 mv

60

mv/g = 16.7 g, rms

2.9 DETERMINATION OF VELOCITY AND DISPLACEMENT FROM ACCELERATION

MEASUREMENTS.

The following equations can be used to determine the rms velocity, displacement, and jerk of a given frequency component in a vibration spectrum when its rms acceleration and frequency are known: a v = 211f

D a

=

2 2

411' f

J

= 211'fa where a= acceleratioQin inches/sec2 v = velocity in inches/sec

D =displacement in inches

J

= jerk in inches/sec3 f =frequency of component (frequency indicated by analyzer)

1r

= 3.14

The above equations are precise when used for aline (single-frequency) component; they give only approximate results for random signals.

2.10 USE WITH A STROBOSCOPE.

The Type 1564-A Sound and

VibrationAnal~er canbe used to trigger a stroboscope, such as the Type 1531-A StrobotaC® electronic stroboscope.

The analyzer is first tuned to a particular component in the vibration spectrum and the stroboscope is then synchronized with that component. The output amplifier is overdriven so that the output waveform has sharp transitions. In this way, jitter caused by variations in acceleration amplitude is minimized.

To overdrive the output amplifier, first obtain an on-scale deflection of the meter, as described in paragraph 2. 7.3. Then tum the BAND LEVEL knob to its maximum counterclockwise position. Do not change the setting of the BAND LEVEL knurled dial to increase the output, as this will overload the filter and render it ineffective.

10


2.11 OPERATION AS A TUNED VOLTMETER.

To calibrate the analyzer for use as a tuned voltmeter, follow the procedure given in paragraph 2.7.1 for use with the Type 1560-P52 Vibration

Pickup. Thus calibrated, the analyzer indicates the level of the voltage applied atitsiNPUTtertninals. When used with the Type 1560-P41 Audio-Frequency

Voltage Probe, the analyzer indicates one tenth of the level applied at the probe. Proceed as in paragraph 2.4.2, except read the lower (black} meter scales. The inner (black) scale of the BAND LEVEL control indicates fullscale voltage sensitivity. Note that when the probe is used, indicated voltages must be multiplied by ten.

2.12 OPERATION WITH A SOUND-LEVEL METER.

2.12.1 GENERAL. A sound-level meter (such as the General Radio Type

1551-C) can be used ahead of the analyzer for band levels less than 44 db, sound-pressure level. Absolute band levels can be read directly from the analyzer when the Type 1564-2020 Detented Knob-and-Dial Assembly(supplied) is used.

2.12.2 CALIBRATION. The following procedure applies specifically to

General Radio sound-level meters, but others can be used. a. Remove the BAND LEVEL gray-knob-and-plastic-dial assembly; loosen the two setscrews that fasten it to the shaft and slide it off. Substitute the detented knob-and-dial assembly. One of the two setscrews in the latter secures the knob to the plastic dial and should not be loosened.

Fasten the assembly to the shaft by means of the other setscrew.

To properly reset the original gray-knob-and-plastic-dial assembly, turn both coaxial shafts fully clockwise and set the assembly to read 100 .

. 1v b. Connect the sound-level meter to the INPUT jack of the analyzer; use the Type 1560-P76 Shielded Cable Assembly (supplied). c. Set the BANDWIDTH switch to ALL PASS, the BAND LEVEL gray knob fully clockwise, and the function switch to FAST. d. Calibrate the sound-level meter according to the instructions for that particular model, or use a Type 1552-B Sound-Level Calibrator. A calibration signal from the sound-level meter is now being applied to the analyzer. e. Adjust the BAND LEVEL knurled dial and then the CAL thumbset control on the analyzer so that its meter indication is the same as that of the sound-level meter. The analyzer is now adjusted to indicate rms sound-pressure level in db re 2 x 10-4 j.Lbar in conjunction with the soundlevel meter. Do not readjust the BAND LEVEL knurled dial during the balance of the procedure.

11

+.TYPE

1~-A

SOUND AND VIBRATION ANALYZER

2.12.3 OPERATION. a. Set the BANDWIDTH control to ALL PASS and tum the BAND LEVEL grayknobfully clockwise, as inparagraph 2.12.2. Obtainanon-scaledeflection of the sound-level meter with its weighting switch at 20 KC, and tum the clear-plastic BAND LEVEL dial in a clockwise direction until the BAND

LEVEL indication (outer red scale) is the same as the attenuatorsetting on the sound-level meter. Both instruments now indicate the ALL PASS level. b. Select the desired bandwidth and frequency, and adjust the BAND

LEVEL gray knob for an on-scale meter deflection. The algebraic sum of the BAND LEVEL and meter indications is the level in the selected band in db re 2

X

IQ-4 j.iba.r.

2.13 OPERATION WITH A VIBRATION METER.

2.13.1 GENERAL. For direct reading of velocity, displacement, or jerk, or when band levels are less than 0.0007 g (0.270 inches/sec2), a vibration meter such as the Type 1553-A can be used. The inner scale of the detented knob-and -dial assembly and the two lower meter scales can be used to read directly acceleration, velocity, displacement and jerk.

2.13.2 CALIBRATION. The following procedure applies specifically to the

Type 1553-A Vibration Meter. For other types, the procedure is similar. a. The output impedance of the Type 1553-A Vibration Meter is 75 kilohms. When this impedance is loaded with the capacitance of the connecting cable and analyzer, a substantial high -frequency roll-off results.

If frequencies above 1 kc are of no interest (for example, when a Type

1560-P52 Vibration Pickup is used) this error is of no consequence. With a wide-range pickup, such as the Type 1560-P53, connect a 10- to 20-kilohm resistor across the output of the vibration meter. This is done most conveniently inside the vibration meter. Remove the case and locate the 20kilohm resistor that is wired to the output jack. Disconnect the end of this resistor that is wired to the center terminal of the jack and transfer it to the jack terminal to which the center conductor of a shielded cable is wired. b. Remove the BAND LEVEL gray-knob-and-plastic-dial assembly; loosen the two setscrews that fasten it to the shaft and slide it off. Substitute the detented knob-and-dial assembly. One of the setscrews in the latter secures the knob to the plastic dial and should not be loosened. Fasten the assembly to the shaft by means of the other setscrew.

To properly reset the original gray-knob-and-plastic-dial assembly, c. Connect the output of the vibration meter to the INPUT of the analyzer; use the Type 1560-P76 Shieldeq-Cable Assembly (supplied). d. Set the BANDWIDTH switch to ALL PASS, the BAND LEVEL gray knob fully clockwise, and the function switch to FAST. e. Calibrate the vibration meter according to its instructions or use a Type 1557-A Vibration Calibrator. A signal from the vibration meter is now applied to the analyzer.

12


f. Adjust the BAND LEVEL knurled dial and then the CAL control to obtain a meter indication on the analyzer that is 11% higher* than the meter indication of the vibration meter. For example, if the vibration meter indicates 8 on the upper scale, set the analyzer to indicate 8

+

(0.11 x 8)

=

8. 9 on its upper scale. The combination is now calibrated to allow the analyzer to indicate rms band levels in the units given by the vibration meter when its METER READS switch is set to AVE. Do not readjust the BAND LEVEL knurled dial during the balance of the procedure.

2.13.3 OPERATION. a. Fasten the vibration pickup rigidly to the vibrating object (refer to Type 1553-A instructions or paragraph 2. 7 in this book for methods of fastening the pickup). b. Set the METER READS switch to PK TO PK. Select the desired vibration quantity (DISP, VEL, ACCEL, or JERK) with the vibration meter

FUNCTION switch. Adjust the SCALE SELECTOR switch for an indication on the vibration meter that is as near full-scale (but not over full-scale) as possible. The vibration meter now indicates. the peak-to-peak level of the vibration quantity given by its FUNCTION switch. Do not readjust the

SCALE SELECTOR switch during the balance of the procedure. Now, set the METER READS switch to AVE. c. With the controls of the analyzer set as in paragraph 2.13.2, observe the reading in the FULL SCALE window of the vibration meter.

Tum the clear-plastic BAND LEVEL dial on the analyzer in a clockwise direction to obtain this same reading (inner black scale). The vibration meter now indicates the average level of the over-all signal, while the analyzer indicates its rms level. d. Select the desired analyzer BANDWIDTH and frequency. Adjust only the BAND LEVEL gray knob for an on -scale meter indication. The rms level in the band selected is read on the meter with the full-scale meter range indicated by the BAND LEVEL dial (inner black scale). The units of the vibration quantity appear in the window adjacent to the FULL

SCALE window on the vibration meter.

2.14 OPERATION WITH THE TYPE 1560·P40 PREAMPLIFIER.

Use of the Type 1560-P40 Preamplifier increases the sensitivity to

24 db sound-pressure level and permits remote use of the microphone.

(Refer to the Appendix for specifications.) The extremely high input impedance of the preamplifier extends the low frequency range when a lowcapacitance pickup such as the Type 1560-P53 is used. The analyzer supplies power for the preamplifier through terminal #2 of the INPUT socket.

*The vibration meter indicates average level; the analyzer indicates rms level. These levels differ by 11% for the sinusoidal calibration signal.

13

14

Plug the preamplifier and microphone combination directly into the

INPUT socket, or make the connection by means of a two-conductor shielded cable of convenient length. (Cables are supplied with the Type 1560-P40K

Preamplifier and Microphone Set; they may also be purchased separately.)

Set the gain switch on the preamplifier to X1 or XlO, as desired. After calibration, the analyzer is direct reading with the gain switch at XI. When the switch is at X10, subtract 20 db from the indication of the analyzer to obtain the actual sound-pressure level.

When the microphone andpreamplifierare used with theType 1564-A

Sound and Vibration Analyzer, the effective microphone sensitivity is increased. This increase occurs because the voltage loss caused by the preamplifier input-capacitance load on the microphone is less than that caused by the input-capacitance load of the analyzer. Also, when a cartridge from a Type 1560-P4 or -P6 Microphone is used, the loss due to the flexible arm is not present. (The sensitivity given for a Type 1560-P4 or -P6

Microphone is for the combination of the cartridge and the flexible arm.)

The Type 1552-B Sound-Level Calibrator is recommended for calibrating analyzer-preamplifier combination. However, the electrical calibrator in the Type 1564-A can be used if the internal sensitivity control, R338, is set properly. When the microphone cartridge is supplied with the Type 1560-

P40 Preamplifier, or when it is removed from a Type 1560-P3 or -P5

Microphone for use with the preamplifier, set the sensitivity control to indicate 1.4 db greater than the specified sensitivity for the microphone.

For example, if the sensitivity of the microphone or cartridge is -61 db, set the internal sensitivity control to -59.6 db (-61

+

1.4 db). When the microphone cartridge is removed from a Type 1560-P4 or -P6 Microphone

Assembly to be used with the preamplifier, set the sensitivity control to indicate 2.1 db greater sensitivity than that specified.

2.15 BACKGROUND LEVEL.

Keep the background level as low as possible for all measurements,

In any band, the level should be at least 10 db below the total measured level for that band. When this is impossible, apply the corrections given in Figure 2-3. iii i

7

.... g

\

\

~

4

I

"\ ill

2 g

I i

I

"""

4

..........

1'---t--.

5

6 7

-

-

8 9

1--

I

1!!

DB DIFFERENCE BETWEEN "TOTAL NOISE AND BACKGROUND ALONE

FigUTe 2·3. Effect of backgro-d noise on measUTements.

2.16 CHOICE OF METER SPEEDS.

The averaging time of the meter depends on the settings of the BAND-

WIDTH and FREQUENCY MULTIPLIER controls, as well as on the setting of the function switch (FAST or SLOW). Three different detector characteristics are provided. In general, use the FAST position for measurements


18

16

14

12

10

4

'

8

6

'

~'

~'

'1'-o..

r--

' I ' r--.....

2 t - -

0

-2

-4 r---99% CONFIDENCE

-

-

-

r--.

-

..

-

't"

r--

1--

...

r---....

......

...

too..

r-....

99%

CONFIDE~CE

t--

--

·-

-

90% CONfiDENCE

90% COrFIDENCE

1--

--

-

-

.....

-

--

--

1..1

I

--

1--

_,._.

--

6.

3

8

10

12.5

16

20

25

3L5

40

50

63

80

FREQUENCY IN CYCLES PER SECOND

100

125

160

200

250

315

400

500

Figure 2-4, a. Confidence curves for 1/10-octave bandwidth with function switch at SLOW.

7

6 r---.

5

4

3

2

I

0

-I

'

r---

'

...........

........

-.t-

-2

-3

~

....

-r-·

-4

...

........

...... t--99% CCN FIDENCE

-

..........

..... ....

_

...........

.....

.. l"·

-

""t-

1--

·-

-::r..._

--

- -

-·

99% CONFIDENCE

-

·-

-

-

90% CO{FIDENCE

~-

-

-

......

-

-

-

~

1-"

--

-

90% CO+IDENCE

-·

--

-·

.-

2.5 3.15

4

5

6

.3 8 IO 12.5

16

20

25

31o5

40

50

63

80 IOO 125


160

200

250

315

40Q

500

Figure 2-4, b. Confidence curves for 1/3-octave bandwidth with function switch at SLOW.

15

TABLE 2.

METER SPEEDS OBTAINABLE WITH VARIOUS SETTINGS

OF THE FREQUENCY MULTIPLIER (See Text)

FREQUENCY

MULTIPLIER

SETTING

1

10

100

1000

SPEED RANGE

(FUNCTION SWITCH)

FAST

2

1

1

1

SLOW

3

2

2

2 on line spectra, and the SLOW position for measurements involving random signals, except possibly in the 2.5- to 25-kc range. Table 2 gives the speeds obtainable with various settings of the FREQUENCY MULTIPLIER switch when the function switch is at FAST or SLOW. The values in the table apply for BANDWIDTH switch settings of 1/3 or 1/10 octave. The speeds are numbered; 1 is the fastest speed and 3 is the slowest. Speeds 1 and 2 are designated

fast

and

slow,

respectively, by the American Standards Association Specification Sl.4-1961 for General Purpose Sound Level Meters.

Speed 1 has the symmetrical rise-and-fall characteristics of the meter movement. The characteristics for speeds 2 and 3 are those of simple resistance-capacitance networks. For speed 2, the rise- and fall-time constants are 0.4 and 1.2 seconds, respectively; for speed 3, they are 2 and 6 seconds.

With the BANDWIDTH switch set to ALL PASS, the speeds corresponding to the FAST and SLOW positions of the function switch are 1 and

2, respectively.

Figure 2-4 can be used to determine the probable error in a given meter indication when the reading fluctuates, as it does for a random signal. The curves apply only when the function switch is set to SLOW. From the curves labelled 90% CONFIDENCE, we find that there is one chance in ten that the long-time rms level (which would be indicated if the meter did not fluctuate) is below the observed level by more than the number of decibels at the lower limit, or is above the observed level by more than the number of decibels at the upper limit. For example, assume that a random signal produces fluctuations of the meter, with the function switch at SLOW, the BANDWIDTH switch at 1/10 OCTAVE, and the analyzer tuned to 5 cps. Suppose the meter indicates a level of +4 db. Then, for a 1/10-octave band cente-red at 5 cps, there is one chance in ten that the long-time level is more than +9. 7 db or less than -+0.8 db.

The 99% CONFIDENCE curve can be used similarly to find the levels that will be exceeded only one percent of the time.

To determine, with greater confidence, the level of a fluctuation signal, a number of readings are taken at intervals of several detector time

16


constants. These readings are then averaged. Confidence limits, in this case, can be determined by dividing the limits for a single reading by the square root of the number of readings taken.

2.17 ALL-PASS FREQUENCY RESPONSE AND EFFECTS OF MICROPHONE AND

VIBRATION PICKUP.

The all-pass frequency response of the Type 1564-A Sound and Vibration analyzer for a constant applied voltage contains a slight roll-off at the frequency extremes when the function switch is set to SLOW (See Figure

2-5). In addition, when the function switch is set to FAST, the detector characteristic becomes average for frequencies below 25 cps, resulting in a 1-db step in the response curve, as shown. Neither this low-frequency step nor the high-frequency roll-off are cascaded with the filter when 1/3or 1 /10- octave bandwidths are selected.

Figure 2-5 also gives the responses of the analyzer-microphone and analyzer-pickup combinations. In each case the low-frequency roll-off is due to the loading of the capacitive impedance of the transducer by the 25megohm input resistance of the analyzer. Deviations at high frequencies are characteristic of the transducers. Both of these response curves may be considered to cascade with the 1/3- and 1 /10-octave filter characteristics.

2.18 OPERATION WITH TYPE 1521 GRAPHIC LEVEL RECORDER.

2.18.1 GENERAL. The analyzer contains an automatic range-changing device that permits continuous amplitude -versus -frequency recordings when it is used with a Type 1521-A or -B Graphic Level Recorder. These two

+10

+8

I

+6

"'

"'

ANALYZER ONLY

FAST METER SPEED irl+2

0

'!"

0

1---

ANALYZER ONLY

1

1---

SLOW METER SPEED

/

/

I

"' ·~

"'

~

6

i£1-8

a:

'-

,_.

-

..

,

I

-ANALYZER WITH TYPE 1560-PS OR

"

'ANALYZER

WIT~ )YPEII5~0!P52

VIBRATION PICKUP AND SLOW

METER SPEED

I /

!'P6

~I~ROPrO~E

AND FAST METER SPEED

ANALYZER ONLY

-----·ANALYZER WITH TYPE 1560·P52

VIBRATION PICKUP

-10

\

"""'

'

-12

-l

4

2.5cps 5.0 u

10 15 25 ro

50 100 150 250

~ ~

-·-·-ANALYZER WITH TYPE 1560-P5

I

1

IR

·r

6 ilfROPHINE

500 IKe 1.5 2.5

~

w

5

1 1

I I

10 15 25

~ ro

FREQUENCY

Figure 2·5. Curves of frequency response for constant applied voltage.

17

models differ primarily in frequency range. The Type 1521-A can be used down to 20 cps; the -B model is usable to 7 cps or lower, if a correction is applied. Two chart papers, differing in length and in scale factor (the product of db/ inch on the vertical scale and inches/ decade on the horizontal scale, expressed in db/ decade), a.re available for use with either recorder. The

Type 1521-9469 chart paper has a length of five inches/decade resulting in a scale factor of 50 db/decade (a proposed international standard) when the

40-db recorder potentiometer (normally supplied) is used. The Type 1521-

9493 chart paper has a length of 7.5 inches/ decade and a scale factor of 75 db/ decade with the 40 -db potentiometer. A Type 1521-PlOB Drive Unit and a

Type 1521-PlSLinkUnit arerequired tocouplethe analyzerto the recorder.

In addition, when Type 1521-9469 chart paper is used, the 24-tooth sprocket normally supplied with the Type 1521-PIS Link Unit must be replaced with a 16-tooth sprocket. The latter is available as part of the Type 1521-Pl6

Sprocket Kit.

The Type 1521-P2, 40-db Potentiometer is supplied with the recorder;

Types 1521-Pl and - P3 potentiometers are also available for amplitude ranges of 20 db and 80 db, respectively.

Three different motors are available for the recorder, to permit various sweep rates. The medium-speed motor, Type 1521-P23 (Type 1521-P24 for 50 -cycle operation), is recommended for general use with the Type 1564-A

Sound and Vibration Analyzer, but the fast-speed motor, Type 1521-Pl9 (Type

1521-P21B for 50-cycle operation), can be used. Table 3 gives the possible recorder chart speeds and analyzer sweep speeds for each motor, with either a 24- or a 16-tooth sprocket.

The completely- assembled analyzer-and-recorder combination is available as the Type 1911-A RecordingSound andVI.brationAnalyzer. This assembly includes the following items:

1-Type 1564-9820 Sound and Vibration Analyzer (rack model).

I-Type 1521-B Graphic Level Recorder, with medium -speed motor.

TABLE 3.

RECORDER CHART SPEEDS AND CORRESPONDING

ANALYZER SWEEP SPEEDS.

FAST-SPEED MOTOR

MEDIUM -SPEED MOTOR

Chart Speed

Inches/Minute

Sweep Speed

Decades/Minute

24-Tooth

Sprocket

16-Tooth

Sprocket

With Type

With Type

1521·9493 1521-9469

Chart Paper Chart Paper

(7 .5 Inches/ (5 Inches/

Decade)

Decade)

Chart Speed

Inches/Minute

Sweep Speed

Decades/Minute

24-Tooth

16-Tooth

Sprocket

With Type

1521-9493

Sprocket

With Type

1521-9469

Chart Paper Chart Paper

(7.5 Inches/

(5 Inches/

Decade) Decade)

75

25

7 1/2

2 1/2

10

3 1/3

1

1/3

15

5

1 1/2

1/2

IS

5

1 1/2

1/2

2

2/3

1/5

1/15

3

1

3/10

1/10

18

PRINCIPLES OF OPERATION

!-Type 1521-PlOB Drive Unit.

!-Type 1521-Pl5 Link Unit, with 16- and 24-tooth sprockets.

10-Roll s, Type 1521-9469 Chart Paper.

!-Type 1560-2140 Adaptor Cable (insul ated double plug to offse t phone plug.

2.18.2 INSTALLATION .

NOTE

The Type 1911-A Recording Sound and Vibration

Analyzer is fully assembled when delivered. The following installation procedure applies only when the analyzer and recorder are ordered separately.

Figure 2-6 shows the portable Type 1564-A Sound and Vibration

Analyzer in its Flip-Tilt case, mounted above the Type 1521 Graphic L eve l

Recorder. The relay-rack-model analyzer (Type 1564-9820) can also be mounted over the recorder. To couple the two instruments, proceed as follows:

(a) Remove the FREQUENCY control knob-and -plate assemb l y that is fastened to the dial cover with a screw on each side of the knob. Also remove the detent-arm assembly (held by a thumbscrew, 4, Figure 2-6).

Figure

2·6.

The Type l564 ·A Sound and Vibration Analyzer with the Type 1521 Graphic Level Recorder.

19

(b) Using the screws removed in (a) (omit the washers), fasten the

Type 1521-PIS Link Unit (1) in place of the knob assembly. Adjust the unit to allow slight backlash when the sprocket is turned. Replace the detentarm assembly.

(c) Install the chain (2) as shown in the figure. Two chains are supplied with the link unit. Use the short chain with the analyzer in its Flip-

Tilt case; the long chain must be used with the relay-rack model. To tighten the chain, loosen the locking screw (3), rotate the sprocket plate to take up most of the slack, and retighten the screw.

2.18.3 OPERATION. The Operating Instructions for the Type 1521 Graphic

Level Recorder include a complete discussion of its operation with an analyzer. Set the external-motor switch to the position toward the rear of the instrument, for continuous operation of the recorder.

If the analyzer-recorder combination is to resolve faithfully the complex variations in a spectrum which it is capable of resolving, certain rules regarding sweep speed (chart speed) and writing speed must be observed.

A sweep speed that is too fast will cause errors in the recorded amplitude, center frequency, and bandwidth of the filter.

If the writing speed is too slow, errors may result due to the inability of the recorder to follow sharp contours in the spectrum. Table 4 gives the recommended maximum sweep speeds and corresponding minimum writing speeds for the various ranges of the analyzer. For the Type 1521-B Graphic Level Recorder, the low cut-off frequency is raised as the writing speed is increased; therefore a maximum writing speed is also imposed for each frequency range, and these are included in the table. Note, also, that the 20-cps low-frequency cut-off of the Type 1521-ARecorderprohibits its use in the lowest (X1) frequency range.

Slower chart speeds and correspondingly slower sweep speeds are recommended when a faithful time-averaged plot of the spectrum is desired.

TABLE 4.

MAXIMUM SWEEP SPEEDS AND CORRESPONDING MINIMUM

WRITING SPEEDS FOR ANALYZER- RECORDER COMBINATIONS.

Range

(Frequency

~ultiplier)

Maximum

Sweep Speed

ODecades/~inute)

~inimum

Writing Speed

(Inches/Second)

Maximum

Writing Speed

Type 1521-B

Recorder Only

(Inches/Second)

Type 1521-B

Recorder Only

1 1

10

100

1000

1/5

1 1/2

5

5

3

10

10

3

10

20

20

20


Section 3

PRINCIPLES

OF OPERATION

3.1

GENERAL.

The various sections of the Type 1564- A Sound and Vibration Analyzer are described in the following paragraphs. Reference should be made to the elementary schetnatic diagram, Figure 3-1.

3.2

PREAMPLIFIER SECTION.

The high input impedance of the preamplifier section permits the amplifier to be driven by any of a variety of transducers, including piezoelectric microphones and accelerometers. The first stage of this section uses two transistors (one of which is a field -effect transistor) to produce an amplifier with an input impedance of 25 megohms, a low output impedance, and a stable gain of about 3 db. Directly before and after the preamplifier are the step attenuators, which are operated by the BAND LEVEL knurled dial. Their purpose is to change the input signal to a level convenient for analyzing.

The continuously adjustable attenuator, operated by the CAL control, is included in this section. A Cannon female connector and a phone jack, connected in parallel, provide convenient connections to various sources.

21

N

N

TO

&AL/1/l~T/I)M

N~tr

ALL PASS AMI'l/FIE/f

A

Ot/TFfJT AMPLIFIER SECTION

I

I

I I

TO ATTEIIUATt:lll

, • . - I.Em/N.UJ t

1""~:=~--------------'

Figure 3·1. Elementary schematic diagram of the Type 1564-A Sound and Vibration Analyzer.

~

-1

.,

Cll

0 c

:z

0

,...

:z

0

< t:D

,...

-1

0

:z

,...

r-

-<

N m

:=a


3.3

FILTER SECTION.

The filter is synthesized as an isolated cascade of two resonant (second -order) sections. The resonant frequencies of the sections are staggered about the selected center frequency to produce a filter having a noise bandwidth of one-third octave. To obtain a one-tenth-octave response, the sections are synchronously tuned. A functional diagram is giveninFigure3-2, and Figure 3-3 shows the amplitude-versus-frequency response for each bandwidth. The plot was produced automatically by a Type 1521 Graphic

Level Recorder and Type 1304-B Beat-Frequency Audio Generator.

}\-

12db/OCTAVE

-

R

CLOSE FOR

1/10 OCTAVE

~~~

12 db/OCTAVE

4

FIRST FILTER SECTION

SECOND FILTER SECTION

Figure 3-2. Elementary schematic diagram of the filter sections.

0

-10

:g-20 z w-30

(/) z

~-40

(/) w

0::-50

-60

200 500

1000

2000 5000 10,000


Figure 3-3. Filter response characteristics.

23

The capacitors C1 through C6are switched by the FREQUENCY MUL T-

IPLIER control and determine the tuning range. The four resistors, R, are adjusted simultaneously by the FREQUENCY control to span the ten-to-one range selected. Frequency responses that are mirror images of each other are the result of interchanged placement o f resistors and c apacitors for the two sections. Attenuation rates approach 12 db/octave at low and high frequencies for the first and second filter sections respectively. A symmetrical over-all filter response is thus obtained. For one-third octave operation, the resonant frequency of the first filter section is 16% higher than that of the second. Waen the one-tenth octave bandwidth is selected, C3 is added in parallel with C2, and C6 is removed from across CS . These changes bring the resonant frequencies of the sections together and increase the Q' s.

The response of the filter to a transient is shown in Figure 3-4. The input signal consisted of a burst of 32 cycles at 1 kc. The filter was tuned to 1 kc for both the 1/3and 1 /10-octave bandwidths. The rise time (time required for the output signal to rise from 10 % to 90% of its steady-state value) and the fall time (time for the signal to fall from 90 % to 10%) were

4 milliseconds for the 1 /3-octave filter and 9 milliseconds for the 1/10octave filter, at the test frequency of 1 kc. F i g u re 3 -5 is a plot of the rise and fall times versus the center frequency, for the two bandwidths.

~~1111111111011\II,IUIUIII'•

... llltlllllldllllillll:lfllll,,'··- -

"'' Ill''''''''·'

IJIW

\!J'

~~'I

IHilillililillilllliifllililll,

I

I

- -......

Top curve: Output for 1/3-octave bandw i dth

Second curve: Input

Figure 3·4. Response of filter to a transient.

..... a!!l'''"' .!

lllll(lll!l!lllllttt

1 .

, 1 ·~' JNN-

... ,,,HitltllllltJtllll .ltlltlllt

''i'

111111111

1

1111111111111!11111111 llllllllillllilllilillllillltil

---~

Third curve: Output for 1/10-octave bandwidth

Lower curve: Input

3.4 ALL-PASS AMPLIFIER.

A separate broad -band amplifier (Fi g ur e 3 -1) is substituted for t he filter when the BANDWIDTH switch is set to ALL PASS. This permits measurem e nt of the unfilt e red signal level so that the coaxial attenuator can be adju s ted fo r t h e g reatest signal-to-noise ratio of the filtered signal.

24


5000 a:

0

:IE i=

10

..J

..J

~

2000

1000

~

700

500

"

....

"

_,

1'-..

'\~(<',_.,

~200 z

01<

\<',)'

(<'+

'1-

8100

::1

70

:::i50

..J i

;;;20

-s,.-'P.

"

0"

:~-(<'

0")'

'<It-

(<'

<9-l

+c~

0

:.>-7

'

7

5

2

""

I a: 0.7

0.5

7

""

"

1\..

'

"

,

.....

0.2

0.12.5

5

10 50 250 1000 5000 25,000

2 5 100 500 2500 IOPOO

CENTER FREQUENCY IN CYCLES PER SECOND

Figure 3·5. Rise and fall times for the filter.

3.5

OUTPUT AMPLIFIER SECTION.

In this section, the signal from the filter is amplified to a level sufficient to drive the meter circuit. This section also provides a one-volt output signal corresponding to a full-scale meter indication.

The meter detector circuit is push-pull driven to provide good linea~ ity and stability. The detector characteristic has been called quasi -rms .

The conduction angle for sinusoidal excitation is chosen to give a detector output nearly rms, for various types of input signals, including noise and square waves.

Two amplifier stages and two attenuators permit a high signal-to-noise ratio, when little over-all gain is required. The attenuators are controlled by the BAND LEVEL knob.

To suit the wide frequency range of the analyzer, three detectoraveraging times are used (refer to paragraph 2.17). These ensure that the user is not burdened with either a slow-acting meter for high-frequency measurements or a widely fluctuating meter

for

noise analyses at low frequencies.

2

E. E. Gross, "Improved Performance Plus A New Look for the Sound-Level Meter," 32,

17, EXPERIMENTER, October, 1958.

25

3.6

CALIBRATION NETWORK.

To amplitude-calibrate the analyzer, the output is connected to the input through a diode limiter and a calibrated attenuator. A 1-kc, RC filter is also included when the BANDWIDTH switch is set to ALL PASS. The attenuation of this feedback network is the calibration reference; it is adjustable by means of a calibrated internal control (refer to paragraph 2.3).

When the over-all gain of the instrument is adjusted to equal the attenuation of the calibration network, the system will oscillate, as indicated by the panel meter.

3.7

POWER SUPPLY.

The Type 1564-A Sound and Vibration Analyzer can be operated from its rechargeable nickel-cadmium battery orfrom a 115- (or 230-) volt, 50to 60-cycle line. A simplified diagram ofthe power supply is given in Figure

3-6. For line operation, the transformer feeds a conventional bridgerectifier and filter-capacitor circuit. The smoothed DC supplies both the circuits of the instrument and the battery. The latter serves to refilter the DC and receives a small charging current (about 5 rna for normal line voltage). Conventional series regulators, with zener diode references, supply 7, 12, and 15 volts for various sections of the instrument. The unregulated battery voltage supplies the final stage of the output amplifier.

The battery automatically supplies current for the instrument when the line is interrupted. The rectifier diodes prevent the currentfrom flowing back through the transformer.

To charge the battery, the load is removed from the instrument and

Switch S is closed (Figure 3-6). s

TO

LINE a::

0

~

<{

..J

:::>

<.!) w a::

+17.6v

MINIMUM

+15v

+12v

+7v

Figure 3·6. Elementary schematic diagram of power supply.

26

SERVICE AND MAINTENANCE

Section

4


4.1

GENERAL.

We warrant that each new instrument sold by us is free from defects in material and workmanship, and that, properly used, it will perform in full accordance with applicable specifications for a period of two years after original shipment. Any instrument or component that is found within the two-year period not to meet these standards after examination by our factory, district office, or authorized repair agency personnel, will be repaired, or, at our option replaced without charge, except for tubes or batteries that have given normal service.

The two-year warranty stated above attests the quality of materials and workmanship in our products. When difficulties do occur, our service engineers will assist in any way possible. If the difficulty cannot be elimina ted by use of the following service instructions, please write or phone our Service Department (see rear cover), giving full information of the trouble and of steps taken to remedy it. Be sure to mention the type and serial numbers of the instrument.

Before returning an instrument to General Radio for service, please write to our Service Department or nearest district office, requesting a

Returned Material Tag. Use of this tag will ensure proper handling and identification. For instruments not covered by the warranty, a purchase order should be forwarded to avoid unnecessary delay.

4.2 REMOVAL OF INSTRUMENT FROM CASE.

To remove the Type 1564-A from its Flip-Tilt case, turn the panel function switch to OFF and remove the four screws near the front panel, two through the top and two through the bottom of the case.

4.3

TRANSISTOR VOLT AGES.

Table 5 gives the normal voltage from the indicated transistor terminal to ground. Allow a deviation of 10 percent from these figures. Set the panel controls as follows:

BANDWIDTif switch- - - - - - - - - - - 1/10 OCTAVE

Function switch - - - - - - - - - - - - - - FAST

27

FREQUENCY dial - - - - - - - - - - - - 10

FREQUENCY MULTIPLIER- - - - - - - 100

BAND LEVEL gray knob- - - - - - - - - maximum clockwise

BAND LEVEL knurled dial- - - - - - - - maximum clockwise

Measurements should be made with a vacuum -tube voltmeter with the battery fully charged (approximately 21 volts).

TABLE 5

TRANSISTOR VOLT AGES

TRANSISTOR TERMINAL

'DC VOLTS TO

GROUND

Q101

(TR -32/C620A)

Q102

(TR- 23 /2N520A)

Ql03

(TR-31/2N445A)

Q104

(TR-10/2N1374)

Q105

(TR- 31 /2N445A)

Ql06

(TR-31/2N445A)

Q201

(TR-2/2N929)

Q202

(TR-10/2N1374)

Q203

(TR -31 /2N445A)

Q204

(TR-2/2N929)

Q205

(TR-10/2N1374)

Q206

(TR-31/2N445A)

Q207

(TR-10/2N1374)

Q208

(TR-42/2N930)

Q209

(TR-10/2N1374)

K

A

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

1.1

7.2

7.4

11.9

12.0

7.8

6.4

11.9

12.0

6.4

5.9

11.9

12.0

6.2

2.9

7.5

7.2

11.9

12.0

7.2

6.0

11.9

12.0

8.5

6.7

11.9

12.0

6.7

0.9

3.0

TRANSISTOR TERMINAL

DC VOLTS TO

GROUND

Q210

(TR -42/2N930)

Q211

(TR -10/2N1374)

Q212

(TR-31/2N445A)

Q301

(TR-21/2N338)

Q302

(TR -31 /2N445A)

Q303

(TR-21/2N338)

Q304

(TR -31 /2N445A)

Q305

(TR-31/2N445A)

Q306

(TR-23/2N520A)

Q307

(TR -23/2N520A)

Q501

(TR-31/2N445A)

Q502

(TR-31/2N445A)

Q503

(TR-31/2N445A)

Q504

(TR-31/2N445A)

Q505

(TR-31/2N445A)

6.5

12.1

6.5

15.1

15.0

21.0

4.0

13.6

13.5

21.0

19.8

12.0

20.0

10.5

15.0

21.0

12.0

21.0

5.6

11.9

12.0

5.6

1.2

5.6

0.9

3.1

3.0

6.4

1.4

4.1

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

E c

4.4 INTERNAL NOISE.

Typical noise levels at the OUTPUT jack are given in Figure 4-1 for each setting of the BAND LEVEL control. The noise levels in decibels are referred to the output voltage corresponding to a full-scale meter indication (approximate! y db re 1 volt) for the 1/3 -octave bandwidth with the INPUT terminals shorted. Levels will be approximately the same for the 1/10octave bandwidth or with other source impedances.

28


-10

-20

./__

r'--

1-o.

['-....... t'-..

r--

"'

..........

~JRANGE

I

...........

~MV(ANGE

""'

.......... 3

MVI

......._ I

RANGE

r-...

........

0.1

0.03

~·

30

V RANGE v\

RANGES

........

.....

.....,.

. /

""'

""'

........ ....

.....,.

........

. /

-

.....

. /

-

~

5.0 10 25 50 100 250 500 1000


2.500 5000 10,000 25,000

Figure 4·1. Typical noise levels at the OUTPUT of the analyzer.

4.5

SERVICEABILITY TEST.

Follow the procedure outlined below to determine that the gain of the analyzer is normal and that its filters are operating properly. An oscillator covering the range from 20 cps to 25 kc and an accurate voltmeter (to monitor the output level of the oscillator) are required. a. ALL-PASS FREQUENCY RESPONSE CHECK. Connect the oscillator to the INPUT terminals of the analyzer and apply a level of 0.5 vat a frequency of 20 cps. Turn the function switch to SLOW, the BANDWIDTH switch to ALL PASS, the BAND LEVEL gray knob fully clockwise, and the

BAND LEVEL knurled dial to

\~0. Adjust the CAL thumbset control so that the 'meter indicates +4 db. Change the oscillator frequency to 25 kc, keeping its level constant at 0.5 volt. The analyzer should now indicate between

+1 and +3 db. b. CHECK FOR UNIFORMITY OF PEAK RESPONSE WITH 1/10-0C-

TAVE BANDWIDTH. With the function switch andBAND LEVELcontrols set as in a., above, tum the BANDWIDTH control to 1/10 OCTAVE, the FRE-

QUENCY MULTIPLIER switch to 10, and the FREQUENCY control to 2.5.

Adjust the oscillator frequency (at a 0.5 -volt level) to give a peak indication on the analyzer meter, and note the reading. This peak indication should occur at a frequency of 25 cps ±2%. (If the oscillator is accurately calibrated, or if a suitable frequency-measuring instrument is available, the frequency of the analyzer can be checked.) Set the function switch to FAST and repeat the procedure, noting the peak amplitude at each of the following frequencies: 20 cps (FREQUENCY MULTIPLIER at 1), 100 cps, 250 cps,

29

1 kc, 2.5 kc, 10 kc, and 25 kc. Maintain the oscillator level at 0.5 v for each frequency. The difference between the maximum and minimum peak amplitudes, at frequencies up to 10 kc, should not exceed 2 db. Considering all frequencies, the variation should not exceed 3 db. c. CHECK FOR UNIFORMITY OF CENTER-FREQUENCY RESPONSE

WITH 1/3-0CTAVE BANDWIDTH. Set the BANDWIDTH switch at 1/3 OC-

TAVE and follow the procedure outlined in b. d. CHECK FOR AMPLITUDE AGREEMENT AT CENTER FREQUENCY

OF 1/3- AND 1/10- OCTAVE FILTER. At any frequency, adjust the oscillator for a peak meter indication, using the 1 /10 OCTAVE BANDWIDTH switch position. Set the switch to 1/3 OCTAVE, maintain the 0.5-volt oscillator level, and note the change in meter indication. This change should not exceed 2 db at frequencies up to 10 kc; it should not exceed 3 db for frequencies above 10 kc.

4.6

FILTER REALIGNMENT.

The filter in the analyzer may require realignment when: a. one or more tuning capacitors have been changed (mylar capacitors, one- or two-percent tolerance, selected by switches S201 and S202), b. the tuning potentiometer has been changed, c. transistor Q201, Q202, Q204, Q205, Q208, Q209, Q210, or Q211 has been replaced.

The serviceability test outlined in paragraph 4.5 should be used in any case, to determine whether or not realignment of the filter is necessary.

The following instruments are required for this test:

An oscillator, covering the range from 20 cps to 25 kc, with some means of monitoring its level at approximately 0.5 v.

A

sensitive ac voltmeter, for levels down to 30 mv having a uniform (±2%) frequency response from 25 cps to 25 kc.

A

frequency meter or equivalent, to measure frequencies of

250 cps and 2.5 kc, with an accuracy of ±0.5%.

Use the procedure outlined below to realign the filter. a. Remove the instrumentfrom its cabinet. The etched-circuitboard is hinged and must be swung out. To do this, remove the three screws near the bottom edge of the board and the screw just above the tuning potentiometer. Swing the board out until it is perpendicular to the panel. Set the analyzer on its right side (with switch S202 at the top). b. Set the following alignment potentiometers near the center of their ranges: R202, R209, R214, R215, R216, R217, R228, R234, R235, R236, R237, and R239.

Set the panel controls of the analyzer as follows:

BAND LEVEL gray knob

BAND LEVEL knurled dial fully clockwise

1 v (12 o'clock)

30


FREQUENCY switch

FREQUENCY MDL TIPLIER switch

BANDWIDTH switch

2.5

100

1/10 OCTAVE

Both BAND LEVEL controls should be left in the above respective positions for steps b through g.

The BANDWIDTH switch should be left at 1 /10 OCTAVE for steps b through n.

Remove the two screws that hold the cover over the FREQUENCY dial (the two nearest the lower edge of the panel). c. Connect the sensitive ac voltmeter to terminal 308R on switch S202.

Be sure the terminal is not shorted to ground or to any other terminal, as this may result in damage to transistor Q205 or Q502. Connect the oscillator to the INPUT jack and set it for a frequency of 250 cps ±0.5% at an amplitude of 0.5 v. Set the function switch to FAST and adjust the CAL control for an indication of about 300 mv on the sensitive ac voltmeter. Turn the FREQUENCY dial of the analyzer until a peak indication on the voltmeter is obtained. This peak should occur at 250 cps ±0.5% as indicated by the

FREQUENCY dial. If it does not, loosen the two setscrews that secure the dial to the shaft. Set the dial so that it indicates exact! y 250 cps and tighten both setscrews. d. Maintain the 0. 5-volt oscillator level for all the adjustments in steps d through g.

With the oscillator set at 2.5 kc, adjust the CAL control on the analyzer for a voltmeter indication of 30 mv. Then adjust the frequency of the oscillator to give apeak indication on thevoltmeterat 250 cps. Using potentiometer R216, set this peak level to 270 mv. e. Set the FREQUENCY dial to 25, and adjust the oscillator frequency for a peak indication on the voltmeter, which will occur near 2.5 kc. Then adjust potentiometers R202 and R209 to obtain a peak voltmeter indication of 270 mv at 2.5 kc, as indicated by the frequency meter. A clockwise rotation of R202 decreases both the amplitude and the frequency of the peak. A clockwise rotation of R209 increases the peak amplitude and decreases the peak frequency. f. Set the fREQUENCY dial to 2.5 and the FREQUENCY MDL TIPLIER to 1000. The peak amplitude should occur at about 2.5 kc. Adjust potentiometer R217 for a voltmeter indication of 270 mv. Repeat this procedure at

25 cps (with the FREQUENCY MULTIPLIER set to 10). Use potentiometer

R215 to again obtain the voltmeter indication of 270 mv. g. Set the FREQUENCY dial to 25, the FREQUENCY MULTIPLIER to

1, and adjust potentiometer R214 for a peak amplitude of 270 mv. h. Turn the function switch to OFF and unsolder the orange-gray shielded lead connected to terminal308Rof switch S202. Select an electrolytic or paper capacitor with a value of 1 iJf or higher and a voltage rating of at least 15 volts. Solder the positive terminal of this capacitor toterminal 308R. Connect the oscillator to the analyzer through the capacitor

31

(with the low oscillator terminal connected to the chassis) and adjust the oscillator level to about 0.4 volt. i. Set the FREQUENCY dial to 2.5, the FREQUENCY MULTIPLIER to 100, the function switch to SLOW and the BAND LEVEL knob to 10 0. The

• v indicator on the BAND LEVEL knurled dial should remain at 12 o'clock.

With the frequency of the oscillator at 25 cps, adjust its level for a fullscale indication on the analyzer meter and note this level.

Change the BAND LEVEL knob setting to

\~0, the function switch to

FAST, and adjust the frequency of the oscillator for a peak indication on the analyzer. Set the oscillator amplitude to the level noted above and maintain this level for the remainder of the procedure. Adjust potentiometer

R236 for an indication of 9 on the meter (10-volt scale). j. Set the FREQUENCY MULTIPLIER to 10, the function switch to

SLOW, and adjust the peak amplitude at 25 cps for an indication of 9, using

R235. Change the function switch to FAST and the FREQUENCY dial to 25.

Adjust R228 and R329 to obtain a peak meter indication of 9 at a frequency of 250 cps, as indicated by the frequency meter. A clockwise rotation of

R228 increases the amplitude and decreases the frequency; a clockwise rotation ot R239 decreases both the amplitude and the frequency of the peak. k. Set the FREQUENCY MULTIPLIER switch to 1 and adjust potentiometer R234 for a peak amplitude indication of 9.

1. Set the FREQUENCY dial to 2.5 and the FREQUENCY MULTI-

PLIER to 1000. Adjust potentiometer R237 for a peak amplitude indication of 9. m. Turn the function switch to OFF. Disconnect the oscillator and the capacitor connected to tenninal 308R of switch S202, and resolder the orange-gray shielded lead. n. Connect the oscillator to the INPUT terminals of the analyzer and set the input level to 0.5 vat 1 kc. Tum the function switch to FAST, the

FREQUENCY MULTIPLIER to 100, and tune the FREQUENCY dial to obtain a peak indication on the meter. Note the level.

Set the BANDWIDTH switch to 1/3 OCTAVE. The change in level must not exceed 2 db. Note this level.

Change the BANDWIDTH switch to ALL PASS and use potentiometer

R125 to adjust the ALL PASS level so that it is midway between the 1/10and 1/3-octave levels. o. Check the analyzer according to the procedure given in paragraph

4.5. If an oscillator with a range to 2.5 cps is available, the four checks in paragraph 4.5can be extended to thelower decade. Both the 1/3-octave and the 1/10-octave peak levels should be uniform

:f:l db down to5 cps and uniform ±1.5 db down to 2.5 cps. The center-frequency amplitudes for the

1/3- and the 1/10-octave bandwidths should agree within 2 db down to 2.5 cps. The all-pass amplitude should be down 1, ±1 db (referred to the level at 1 kc) at 2.5 cps, when the function switch is at SLOW.

32

REF. NO.

R203

R204

R205

R206

R207

R209

R210

R211

R212

R213

R214

R215

R121

R122

R123

Rl24

R125

R126

R127

R128

R129

R130

R201A

R201 B

R201C

R201D

R202

R101

R102

R103

R104

R105

R106

R107

R108

R109

RllO

R111

R112

R113

Rll4

Rll5

Rll6

Rll7

Rll8

R119

R120

PARTS LIST

RESISTORS

PART NO.

FILM, 22.6 MQ ±1% 1 w

6189-5226

FILM, 255 KQ ±1% 1/8 w

FILM, 2.55 MQ ±1% 1/2 w

6250-3255

6450-4255

COMPOSITION, 470 KQ ±5% 1/2 w

COMPOSITION, 300 KQ ±5% 1/2

FILM, 22.6 KQ ±1% 1/8 w w

6100-4475

6100-4305

COMPOSITION, 47 MQ ±5% 1/2 w

6100-6105

COMPOSITION, 6.2 KQ ±5% 1/2 w

6100-2625

POTENTIOMETER, COMPOSITION, 50 KQ ±20%

6040-0900

COMPOSITION, 47 MQ ±5% 1/2 w




POTENTIOMETER, 100 KQ ±10% w

6100-6475

6100-3105

6100-2625

6100-4105

6010-1700

6250-2226

FILM, 15.4 KQ ±1% 1/8

FILM, 71.5 KQ ±1% 1/8

FILM, 61.9 KQ ±1% 1/8 w w w


COMPOSITION, 30 KQ ±5% 1/2 w w

6250-2154

6250-2715

6250-2619

6100-3155

6100-3305





6100-3105

6100-4125

6100-3205

6100-3105


6100-3365

POTENTIOMETER, COMPOSITION, 50 KQ ±20%

6040-0900


6100-3915


6100-3185

COMPOSITION, 8.2 KQ ±5% 1/2

COMPOSITION, 300 KQ ±5% 1/2 w w

6100-2825

6100-4305

6099-4105

COMPOSITION, 100 Kn ±5% 1/4 w

POTENTIOMETER, 30.7 KQ




0973-4300

0973-4300

0973-4300

0973-4300

POTENTIOMETER, COMPOSITION, 500 Q ±20% 6040-0300

PRECISION, 2. 74 KQ ±1% .3 w

6730-1274

COMPOSITION, 30 KQ :t5% 1/2 w

6100-3305

COMPOSITION, 91 KQ :t5% 1/2 w



POTENTIOMETER, COMPOSITION, 500 Q 20%

PRECISION, 2.74 KQ ±1% .3 w

6100-3915

6100-3135

6100-2105

6040-0300

6730-1.274

COMPOSITION, 15 KQ ±5% .1/2 w

PRECISION, 10 KQ ±1% .3 w

6100.;.3155

6730-2100


6100-3305

POTENTIOMETER, COMPOSITION, 250 n ±20% 6040-0200

POTENTIOMETER, COMPOSITION, 250 n ±20%

6040-0200

33

REF. NO.

R228

R229

R230

R231

R232

R233

R234

R235

R236

R237

R239

R240

R241

R242

R216

R217

R218

R219

R220

R221

R222

R223

R224

R225

R226

R227

R308

R309

R310

R311

R312

R313

R314

R315

R316

R317

R318

R319

R243

R244

R245

R246

R301

R302

R303

R304

R305

R306

R307

RESISTORS, Continued

PART NO.

POTENTIOMETER, COMPOSITION, 250 Q ±20% 6040-0200

POTENTIOMETER, COMPOSITION, 500

PRECISION, 432 n

±1%

.3 w n

±20% 6040-0300

6730-0432

FILM, 1.40 KQ ±1% 1/8 w

COMPOSITION, 4.7 KQ ±5% 1/2w

6250-1140

6100-2475

FILM, 90.9 KQ ±1% 1/8 w

FILM, 9.53 KQ ±1% 1/8 w

FILM. 20.5 KQ ±1% 1/8 w


COMPOSITION, 30 KQ ±5% 1/2w


COMPOSITION, 8.2 MQ ±5% 1/2 w




6250-2909

6250-1953

6250-2205

6100-3155

6100-3305

6100-3105

6100-5825 n

±20%

6040-0300

6730-1274

6100-2475

COMPOSITION, 30 KQ ±5% 1/2 w 6100-3305

PRECISION, 10 KQ ±1% .3 w

PRECISION, 432 n

±1% .3 w



6730-2100

6730-0432 n

±20% 6040-0200 n

±20% 6040-0200

POTENTIOMETER, COMPOSITION, 250 Q ±20%

6040-0200

POTENTIOMETER, COMPOSITION, 500 n

±20% 6040-0300

POTENTIOMETER, COMPOSITION, 500 n

±20% 6040-0300



6730-1274

6100-3305

6100-3915







FILM, 3.83 KQ ±1% 1/8 w

6100-3135

6100-2105

6100-4105

6100-2105

.6100-4165

6250-1383

FILM, 10 KQ ±1% 1/8 w

FILM, 20.5 KQ ±1% 1/8 w



FILM, 60.4 KQ ±1% 1/8 w

FILM, 60.4 KQ ±1% 1/8 w




COMPOSITION, 100 KQ ±5%. 1/2 w

FILM, 20.5 KQ ±1% 1/8 w

FILM, 10 KQ ±1% 1/8 w

FILM, 3.83 KQ ±1% 1/8 w


FILM, 60.4 KQ ±1% 1/8 w


FILM, 60.4 KQ ±1% 1/8 w

6250-2100

6250-2205

6100-4125

6100-3105

6250-2604

6250-2604

6100-4335

6100-3205

6100-2825

6100-4105

6250-2205

6250-2100

6250-1383

6100-3625

6250-2604

6100-2515

6250-2604

34

REF. NO.

R330

R331

R332

R333

R334

R335

R336

R337

R338

R339

R340

R341

R342

R343

R344

R345

R346

R501

R320

R321

R322

R323

R324

R325

R326

R327

R328

R329

R502

R503

R504

RSOS

R506

R507

R508

R509

R510

RSll

R512

R513

R514

R515

R516

C101

C102

C103

C104

RESISTORS, Continued







COMPOSITION, 7.5 i<n ±5% 1/2 w



COMPOSITION, 680 n ±5% 1/2 w





COMPOSITION, 220 Kn ±5% 1/2 w

FILM, 34.8 KQ ±1% 1/8 w

POTENTIOMETER, COMPOSITION, 50 Kn


POTENTIOMETER, 10 KQ ±5%

FILM, 3.01 KQ ±1% 1/8 w

FILM, 100 KQ ±1% 1/8 w

FILM, 100 KQ ±1% 1/8 w

FILM, 68.1 KQ ±1% 1/8 w

FILM,

140 KQ ±1% 1/8 w



FILM, 3.01 KQ ±10% 1/8 w

COMPOSITION, 1 KQ ilO% 1 w




COMPOSITION, 5.1 Kn ±5% 1/2 w

FILM, 33.2 KQ ±1% 1/8 w

FILM, 23.7 KQ ±1% 1/8 w



FILM, 38.3 KQ ±1% 1/8 w

FILM, 33.2_Kn ±1% 1/8 w

COMPOSITION, 6.8 K ±5% 1/2 w





±20%

CAPACITORS

TRIMMER, 0.8 - 8.5 pf

MICA, 24.9 pf

±2% 500 dcwv

PLASTIC, 0.00261 j.lf

±2% 200 v

TRIMMER, 8 - 50 pf

PART NO.

6100-2685

6100-4155

6100-2515

6100-3205

6100-3205

6100-2515

6100-2755

6100-3135

6100-3475

6100-1685

6100-2625

6100-1825

6100-2625

6100-3205

6100-4225

6250-2348

6040-0900

6100-3475

0971-4240

6250-1301

6250-3100

6250-3100

6250-2681

6250-3140

6100-4305

6100-3475

6250-1301

6110-2109

6100-1395

6100-1395

6100-1395

6100-2515

6250-2332

6250-2237

6100-2205

6100-2625

6250-2383

6250-2332

6100-2685

6100-1240

6100-1515

6100-1515

6100-1105

4910-1101

4650-0024

4860-7331

4910-1170

35

REF. NO.

Cl05

Cl06

Cl07

Cl08

Cl09

CliO

Clll

Cll2

C200

C201

C202

C203

C204

C205

C206

C207

C208

C209

C210

C211

C212

C213

C214

C215

C216

C217

C218

C219

C220

C221

C231

C232

C233

C234

C235

C236

C237

C238

C239

C240

C241

C222

C223

C224

C225

C226

C227

C228

C229

C230

36

CAPACITORS, Continued

MICA, 215 pf ±2% 500 dcwv

PLASTIC, 0.022 !lf ±10% 100 v 100 dcwv

ELECTROLYTIC, 15 !lf +100- 10% 15 dcwv

ELECTROLYTIC, 60 !lf +100 - 10% 25 dcwv




ELECTROLYTIC, 15 !lf +100 - 10% 15 dcwv

MICA, 30 pf ±10%

MICA, 56 pf ±5%

MICA, 10 pf ±10%

MICA, 556 pf ±1%

PLASTIC, 0.589 !lf ±1% 100 v

PLASTIC, 0.0589 !lf ±1% 100 v

PLASTIC, 0.00589 !lf ±1% 200 v

PLASTIC, 0.00589 !lf ±1% 200 v

PLASTIC, 0.0589 !lf ±1% 100 v

PLASTIC, 0.589 !lf ±1% 100 v

PLASTIC, 2.94 !lf ±1% 100 v

PLASTIC, 2.94 !lf ±1% 100 v

MICA, 930 pf ±2%

PLASTIC, 0.93 !lf ±2% 100 v

PLASTIC, 0.0930 !lf ±2% 100 v

PLASTIC, 0.00930 !lf ±2% 100 v

MICA, 10 pf ±10%

MICA, 56 pf ±5%


MICA, 10 pf ±10%

MICA, 56 pf ±5%

MICA, 508 pf ±1%

PLASTIC, 0.00589 !lf ±1% 200 v

PLASTIC, 0.0589 !lf ±1% 100 v

PLASTIC, 0.589 !lf ±1% 100 v

MICA, 930 pf ±2%

MICA, 93 pf ±2%

PLASTIC, 0.0930

fli

±2% 100 v

PLASTIC, 0.00930

fli

±2% 100 v

PLASTIC, 0.00682 !lf ±1% 200 v

PLASTIC, 0.0682 !lf ±1% 100 v

PLASTIC, 0.682 !lf ±1% 100 v

PLASTIC, 3.41 !lf ±1% 100 v

PLASTIC, 3.41 !lf ±1% 100 v

ELECTROLYTIC, 15flf +100- 10% 15 dcwv

MICA, 10 pf ±10%

MICA, 56 pf ±5%

MICA, 47 pf ±10%

MICA, 30 pf ±10%

MICA, 30 pf ±10%

MICA, 30 pf ±10%

CERAMIC, .0047 tJf ±20%

PART NO.

4650-0321

4860-7860

4450-3700

4620-0100

4640-0321

4450-3700

4620-0100

4640-0321

4710-0579

4860-7502

4860-7866

4860-7992

4700-1130

4650-0180

4860-7885

4860-7590

4860-7506

4860-7867

4860-7993

4860-8410

4860-8410

4450-3700

4620-0100

4640-0321

4620-0700

4620-0650

4620-0650

4620-0650

4405-2470

4450-2900

4450-3700

4450-0400

4450-3900

4450-3700

4620-0650

4640-0321

4620-0100

4710-0628

4860-7992

4860-7866

4860-7502

4860-7502

4860-7866

4860-7992

4860-8380

4860-8380

4700-1130

4860-7997

4860-7885

4860-7590

REF. NO.

C308

C309

C310

C311

C312

C313

C314

C315

C316

C501

C502

C503

C504

C505

C506

C507

C242

C243

C300

C301

C302

C303

C304

C305

C306

C307

CAPACITORS, Continued

CERAMIC, .0047 f-1£ ±20%

CERAMIC, .0022 f-1£ ±20%

MICA, 390 pf

:f:lO%

ELECTROLYTIC, 15 f-1£

+100 - 10% 15 dcwv

ELECTROLYTIC, 5 flf +100 - 10% 50 dcwv

ELECTROLYTIC, 15 flf

+100 - 10% 15 dcwv


+100- 10% 6 dcwv


+100- 10% 15 dcwv



+1 00 - 10% 6 dcwv

ELECTROLYTIC, 60 flf +100- 10% 25 dcwv

ELECTROLYTIC, 1 flf ±20% 35 v


+100 - 10% 25 dcwv


ELECTROLYTIC, 60 f-1£ +100 - 10% 25 dcwv


+100 - 10% 25 dcwv

PLASTIC, 0.00154 flf ±1% 200 v

PLASTIC, 0.00154 flf ±1% 200 v

MICA, 48.7 pf ±2%





ELECTROLYTIC, 22 flf ±20% 15 w


ELECTROLYTIC, 6.8 flf ±20% 35 dcwv

REF. NO.

DIODES AND RECTIFIERS

CR301

CR302

CR303

CR304

CR305

CR306

CR307

CR308

CR309

CR501

CR502

CR503

CR504

CR505

CR506

CR507

IN34AS

IN34AS

IN34AS

IN34AS

IN645

IN645

IN645

IN645

IN645

IN3253

IN3253

IN3253

IN3253

IN965B

IN957B*

IN959B*

PART NO.

6082-1003

6082-1003

6082-1003

6082-1003

6082-1016

6082-1016

6082-1016

6082-1016

6082-1016

6081-1001

6081-1001

6081-1001

6081-1001

6083-1015

6083-1038

6083-1037

PART NO.

4405-2470

4405-2229

4700-0576

4450-3700

4450-3900

4450-3700

4450-2610

4450-3700

4450-3900

4450-2610

4450-2900

4450-4300

4450-2900

4450-2610

4450-2900

4450-2900

4860-7317

4860-7317

4650-0090

4450-5596

4450-2200

4450-3000

4450-3800

4450-5300

4450-3900

4450-5000

*

30 f.L v max. noise in 40 kc band with 0.5 rna bias.

37

REF. NO.

B501

B502

J101

J301

M301

PL501

S0101

S101

Sl02

S103

S201

S202

S301

T501

REF. NO.

Q212

Q301

Q302

Q303

Q304

Q305

Q306

Q307

Q501

Q502

Q503

Q504

Q505

Q101

Q102

Q103

Q104

Q105

Q106

Q201

Q202

Q203

Q204

Q205

Q206

Q207

Q208

Q209

Q210

Q211

TRANSISTORS

2N930

2N1374

2N445A

2N2349

2N445A

2N2349

2N445A

2N445A

2N520A

2N520A

2N445A

2N445A

2N445A

2N445A

2N697

C6601

2N520A

2N445A

2N1374

2N445A

2N445A

2N929

2N1374

2N445A

2N929

2N1374

2N445A

2N1374

2N930

2N1374

MISCELLANEOUS

BATTERY, Gould Nat. 9.6v /450B

BATTERY, Gould Nat. 9.6v /450B

JACK

JACK

METER

POWER PLUG

SOCKET

SWITCH

SWITCH

SWITCH

SWITCH

SWITCH

SWITCH

TRANSFORMER

PART NO.

8210-1032

8210-5200

8210-4451

8210-1374

8210-4451

8210-4451

8210-1002

8210-1374

8210-4451

8210-1002

8210-1374

8210-4451

8210-1374

8210-1042

8210-1374

8210-1042

8210-1374

8210-4451

8210-1021

8210-4451

8210-1021

8210-4451

8210-4451

8210-5200

8210-5200

8210-4451

8210-4451

8210-4451

8210-4451

8210-1040

PART NO.

8410-2800

8410-2800

4260-1500

4260-1500

5730-1371

4240-0702

4230-2850

7890-3180

7890-3180

7890-3181

7890-3182

7890-3183

1564-1710

0746-4420

38

-~

"""

CIJBLE

6Y-6N

,, c:~

ro

s202.~2osF

DIAGRAM 2 tUPPER RIGHT)

C203

556

S201

1l1BF

-:::~;;8-F

G'I'-8L

R/02

255K

1/BW

CIJ8LF WH

~

CJ04

8-50

-

S/0.

~

tC£1'11

BAND LEVfL

(R£AR(1!AL)

.IV

•

·03V

•

• 01\1

•

'""

• lm>

•

• 3"'"

8('1'1 OtALS

COI./Ni t

&it.LVC'#f. V#t.SF

P./04

4701(

,-,

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,,

R/05

300·

R/09

41M

A.7:53

+IS A

SI')J Ltt;£.NJ'

WH-BL-8/1

Wlf-OH

-

OFF

•

Fo.~.~ t

•

SLOW

•

CAL

•

Cll. HAl

•

+12 tm:. lOOK

A.T$4

C!>:;t'·r.56

4tOF

S20&

LEG£Ni~

~ P.t-.Lot'VIL.ft1 e

1/3 Q(.IAVF e

1110 OCTAVE

21)7F

::~

C48L£ vr

+!SA

•

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4T.

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60

Rt/41

22.61( R/15

1/BW /5.4/f

1/BW

Rt!F l'f.ljK

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S/O.?LEGEIVO

BANL.LEVEL

(FRONT 0/ALJ

-

·''

•

.3V

•

IV

•

3V

•

10;

•

~v

80Th

OIAL.~

COUNTERCLOCKWISE

R/19

30A

+12

0104

C/09£

1~pF

-

S2U/LEGENO

.=-

iEQUfrK.Y

MULTIPLIER

XI

•

YIO

•

XIOO

•·

.1(1000

fi5A

,••

.::1::-

..,R/2:J

1/0if

Rt24

:36A

Ct/0

+

200pF R/::8

(KJ

~

,...,""'c:c.F,_.;-•-.T"'cA.,s.,_u._s,.<'--'::-i;r_

~ 'rftlJ.~~t'fR·

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(UPI-tt? LETT)

•

•

,,

,,

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!"",

C2J4

15pF

+

51102

4/lf

':;

ABLE

VT-62'

11.1.43

0211

f:"· .,

C-4b ..

£

¥1-'lv

$20/

R232 lOA

.,J,-·3"'

ATSS t/fH·/'1.

CATHOO£

AIVOOCOGR/0

Q/Ot

8ASC

CMOCOU

POTTOMVIEN

0102 THRU Q106

0201 THRU Q212

Figure 4-2. Schematic diagram of Type 1564-A Sound and Vibration Analyzer.

FROM 5202, 309F

DIAGRAM I (CENTER RIGHT)

_["'!' :

=

1

CABLE

( :J

81.

•

•

<IIF

•

Ei

OK w

9

•

5102

CABLE WH-6N

•

•

•

•

•

•

5102

LEGEND

BAND LEVEL

(FRONT OIALJ

.1'1

.3V

IV

3V rov

JOV

BOTH DIALS

COUNTERCLOCKWISE

+158

R305

120K

R309

330K

R308

6().4K

1/BW

R311

8.2K

C300

390

R301

1601<

A.T.

21

C304

200pF

CABLE

VT-BL

,..

'

~-·

/

PART OF

FREQUENCY

CONTROL

.?201-A,B,C,O

BA(

+17.6MIN

R325

5,/K

H32E

5./k

R316

62.

C306

rF·

+--_._--H

BAS£ l"MocOCL

BOTTOM VIEW OF

(}301 THRU (}307

(}501 THRU ()505

5103

LEG~ND

•

OFF

•

FAST

•

SLOW

•

CA'

•

CK BAT

•

CHARGE

INPIJi-

!15/230V

50-60C

NOTE UNLESS SPECIFIED

I POSITION OF ROTARY SWITCHES

SHOWN COUNTERCLOCKWISE

5 RESISTANCE IN OHMS

K 1000 OHMS M 1 MEGOHM

2. CONTACT NUMBERING OF SWITCHES

EXPLAINtD ON SEPARATE SHEET

SUPPLIED IN INSTRUCTION BOOK

3. REFER TO SERVICE NOTES IN INSTRO::-

TION BOOK FOR \IOLTAG<-S

APPEARING ON DIAGRAM

6 CAPACITANCE VALUES ONE ANO

OVER IN PICOFARADS. LESS

THAN ONE IN MICROFARADS

7.

8

Q

KNOB CONTROL

G

SCREWDRIVER CONTROL

9 AT ANCHOR TERMINAL

( . )

A.r.

CL

R335

34.8K

1/BW

WH-OR-6Y

l

5201

..

,,-

105F 106: -

,-,

~~~~~

.....

~

0/F

102F

1""'

1

•

•

CABLE 'YE-6Y ... ~,

·.:

•

A.7:58

BAT

+17.6MIN +12

R50/

IK

IW

1?504

390

R501!

390

CSOI

25pF

R503

390

C503

25pF

C502

50pF

+

R514

5tO.n

+?.OV

A.T.9

A.T

4

Y£

FOR fi5V OPERATION

CONNECT I T03 8 2 T04

FOR 230V OPERATION

CONNECT 2 TO 3

A.r.

6

CR504

R329

680

5202

CABLE

F-i=-J,---"6'-Y--+r·+1---.

~c:,;F/03

~

(INPUr/

DIAGRAM/

(CENTER LEFT)

R331

820

()307

5201

LEGEND

FREQUENCY

MULTIPLIER

•

•

10

• roo

•

1000

5202

LEGEND

BANDWIDTH

•

ALL PASS

• l/3 OCTAVE

•

1110 OCTAVE

+IS A TO S0/01,2

~""

+158

240

1?512 o.BK

:J

vr

,1-BTO

R2018 cw

CR507

R511

07

33.2K 6.8pF

1/BW

39

510185102

LEGEND

SLOW

•

FAST.

CAL

•

CK

•sAT

.CHARGE

,i\

10/R

"(.:>To,.

0

..

,

-~'

\

~"'

0

,__ :st(l3 , _ _,

o.,... ... '...., .

J ....

...,o

0

It

I \ 0

'

!

\.

'._: /06R

FREQUENCY

MULTfDLIER

10

I'

100

5201

LEGEND

1000

NOTE:

ALL SWITCHES AND DIAL IN

COUNTERCLOCKWISE POSITION

40

BANDWIDTH

1/3

ALL ocT:vE 1/IO

PASS\ •OCTAVE

S202

LEGEND

F'.

YOIR

~oro,.

.. -·ce;,.,o_.

0

.. ~.~' e

..... 0

\.' ./ ... ~

l

c\ . ..;

-:~

'. .. : 106R

Figure 4•3.

Rotary switch

J.121ail J.rawino.

o"'

,__ lstoe

0

I

I

,,'V

" ' • ..L ") ').

.. _.. 306r

~

'r'

•5011'

-<.

>(

'

~

:-e-:

0

\

..

'

~

/

"

•504R

Figure 4-4. Etched-circuit boau.for Type 1564-A Sound and Vibration Analyzer.

APPENDIX

TYPE 1560-PS MICROPHONE AND

TYPE 1560-P6 MICROPHONE ASSEMBLY

SPECIFICATIONS

(See Figure 1-2 and paragraph 1.6.1)

Frequency Response:

Typical response is shown in the accompanying plot. Deviations of individual units from the typical response are approximately ±0.3 dB from 20 to 1000 c/s and ± 1 dB up to about 7000 c/s.

Sensitivity:

-60 dB re 1 V/p.bar nominal.

Temperature Coefficient of Sensitivity:

Approximately -0.01 dB;oC.

Internal Impedance:

Capacitive; TYPE 1560-P5, 390 pF at 25°C, nominal; TYPE 1560-P6, 425 pF at 25°C, nominal. Temperature coefficient of capacitance: 2.2 pF ;oc over range of 0 to 50°C.

+4

Vl

~+2

-

Ill u

0

0

"'

-2

-4

20c/s

TYIPICAL

~ANDOMI

RESPONJE OF

MIICROPH~NE

50 100 200 500

FREQUENCY lkC/S 2 5

/

I

\

\

10 20

En•1ironmental Effects:

Microphone is not damaged by temperatures from -30 to +95°C and relative humidities of 0 to 100%.

Terminals:

Microphones fit 3-terminal microphone cable connector.

For hum reduction both microphone terminals may be floated with respect to ground.

Cartridge Dimensions:

length 1Ys in (29 mm).

Diameter 0.936 ± 0.002 in (23.7 mm),

Net Weight:

(0.3 kg).

TYPE 1560-P5, 2 oz (60 g); TYPE 1560-P6, 8 oz

Shipping Weight:

3 lb (1.4 kg).

TYPE 1560-P5, 1 lb (0.5 kg); TYPE 1560-P6,

41

TYPES 1560-PllB, 1560-P13, AND

1560-P14 VIBRATION PICKUP SYSTEMS

SPECIFICATIONS

(Refer to paragraph 1.6.2)

Rms Acceleration (ln/s2)

Rms Velocity (in/a)

Rms Displacement (in)

Frequency

Roqe

Response characteristics for constant applied (1) accel· eratlon, (2) velocity, and (3) displacement.

N., Weight of System (lb)

Shipping Weight (lb)

Catalog Number

Typo IS60·P118

Vlltrotlon Pickup System

Typo IS60·P13

VIbration Pickup System

Typo 1560·P14

Vlltrtttlon Pickup System

0.1 to 39,000 (100 olt

0.001 to •

0.00003 to •

0.3 to 390,000 (1000 g)t

0.001 to 1 000

0.00003 to 30

O.ol to 3900 (10 g)t

0.0001 to

*

0.000003 to •

I[~~F~

'eo

$0 toO !100 ,.

_.,.,NCYQ.DPOI·n ""

1!··:~ lftf~~

~IIIC>ClDI'£liiiUOICI

B

-IOIO

11)0

ZOO 10 ZO fllf:~INCYtU!II'SI~

2 ~1

ICil

2 (1 kg)

1

'A

(0.8 kg)

1

'A

(0.8 kg)

5 (2.3 kg) 5 (2.3 kg) 5 (2.3 kg)

1560-9922 1560-9613 1560-96U

Pickup Type Number

Sensitivity (rnV /g), nominal

Temp Coeff of Sens

(dare)

Resonant Frequency (c/s)

Capacitance (pf)

Temperature Ron1• (°C)

Relative Humidity Range

(%)

Cable Lon1th (It)

Dimensions (in)

(mm)

Net Weight (oz)

Cotalog Number

Type 1560·P52

75

0.06

3200

10,000

0 to

75

0 to 100

5 (1.55 m)

1~ by 1!1.by'llo

~2 by 37 by 15

1.6 (H groms)

1560-9652

Pickup Characteristics

Type 1560-P 53

72

<0.02

35,000

350

-18 to 120

0 to 100

8 (2.5 m)

.Y.

hex by 0.7

15.5 by 18

1.1 (31 groms)

1560-9653

=e~!l~~:t~~it~1{i~lb:r~~n~~~~n~~ty oen;::u{ro:fn;•,::~g: i~~~Tirt~~~:f!/T;~r=j~~emadmum t g -acceleration of gravity.

Type 1560-P5~

580

0.01

5000

700

-18 to 120

0 to 100

I (2.5 m)

1'ioi. dia by 1\lo

31 by

27

3.1 (90 grams)

1560-965~

42

TYPE 1560-P40 PREAMPLIFIER

SPECIFICATIONS

(See Figure 1-5 and paragraph

1.

6.4)

Gain:

1:1 or 10:1 (20 dB) ± 0.3 dB.

Input Capacitance: 6 pF.

Input Resistance:

>500 Mfl at low audio frequencies.

Output Resistance:

1 :1 gain - approx 5 fl.

10:1 gain - approx 100 fl.

Noise:

~2.5 p.V equivalent input voltage (400-pF source impedance, C-weighted, 8-kc effective bandwidth).

Frequency Response:

±0.3 dB from 5 c/s to 500 kc/s.

Harmonic Distortion at Audio Frequencies:

Open circuit, at 1 V, peak-to-peak: <0.25%.

Capacitor load of 0.01

p.F

(equivalent to a cable over 200-ft long): Maximum output (peak-to-peak) at 1% distortion is 5 V for 1 kc/s, 2 V for 10 kc/s.

Accessories Available

(in combinations listed below): Power supply, includes two 9.6-volt nickel-cadmium rechargeable batteries, a charging circuit, a battery-check light, and a power cord.

TYPES

1560-P96, 1560-P97, and 1560-P98 Adaptors for converting the input pin connections to 3-terminal shielded microphone connectors, to the pin sockets necessary for the cartridge of a

TYPE

1560-P3 Microphone, and to a General Radio

TYPE

874

Connector, respectively.

TYPES

1560-P72 (25-ft) and 1560-P72C (4-ft) cables for supplying power to and transferring the signal from the preamplifier.

TYPE

1560-P95 Adaptor Cable for connecting the signal from the power supply through a cable to a

TYPE

274 Double Plug.

TYPE

1560-P99 Adaptor Cable for connection from phone plug to microphone plug.

Power Supply:

Dimensions:

15

V to 25

V,

1 rnA to 2 rnA, de. length

6Ys,

diameter 1.155 by 1 in (175, 30, 26 mm).

Net Weight: 9 oz

(0.3 kg).

Shipping Weight: 3 lb (1.4 kg).

TYPE 1560·P40H

PREAMPLIFIER AND POWER SUPPLY SET

Consists of:

Type 1560-P40 Preamplifier

Type 1560-P96 Adaptor

Type 1 560-P98 Adaptor

Type 1 560-P95 Adaptor Cable

Type 1 560-P99 Adaptor Cable

Type 1 560-P72C Cable (4 ft)

Type 874-Q2 Adaptor

Power Supply

Shipping Weight:

10 lh (4.6 kg).

TYPE 1560·P40J

PREAMPLIFIER AND ADAPTOR SET

Consists of:





Type 1560-P72C Cable (4 ft)

Shipping Weight: 4 lb (1.9 kg).

TYPE 1560·P40K

PREAMPLIFIER AND MICROPHONE SET

Consists of:


Type 1 560-P72C Cable (4 ft)

Type 1560-P72 Cable (25ft)

Type 1560-P32 Tripod

Microphone Cartridge

Shipping Weight:

14 lb (6.5 kg).

43

ACCESSORY INSTRUMENTS

TYPE 1 52 1 GRAPHIC LEVEL RECORDER

Plots linearly in db on 4 -inch chart paper the rms level of a -c voltages from 20 cps to 200 kc. Ideal for plotting the responses of electro-acoustical devices as a function of frequency. Can be coupled to oscillators and ana l yzers for automatic plotting . Recorder range is 40 db full scale with plug-in potentiometer supplied (20 -db, 80 db, and de potentiometers also available) .

Recorder sensitivity is 1 mv (0 db point) and can be varied from 1 mv to 1 v in 6 steps with input attenuator. Writing speed is 20 in./sec with 40 db pot (200 db/ sec) with less than 1 db over-shoot. Slower speeds (1, 3, or

10 in./ sec) can be selected by switch to provide filtering of rapidly varying leve l s. Fo u r paper speeds: 2.5, 7 .

5, 25 and 75 i n .

/min. (Optional models ava il ab l e w i th s p eeds from either 2.5 to 75 in./h r or 0.5 to 15 in./mi n .)

TY PE 1557-A V I B R ATION CALIBRATOR

Provides simple, accurate, and rapid calibration of vibra tion pickups. This battery- operated instrument makes possible single frequency calibration of a wide variety of accelerometers ranging in mass up to 300 grams. G-R

Types 1 560-P5 1 , 759-?35 and 76 1?1 Vibration Picku p s may be easily calibrated with this instrument as well as accelerometers of other manufacture.

TYPE 1553 A VIBRATION M E TER

Basically, t h e Vibration Meter is a vtvm spec i fical l ydesigned to amplify and measure the outputs from a wide variety o f vibration pickups. The pick u p delivers a voltage proportional to the acceleration of the vibrating body. Integrating networks co n vert the pickup's output to a voltage propert i ona! to either velocity or displacement.

A differentiating network converts the pickup ' s output to a voltage proportional to time rate of change of acceleration ( jerk) which no other instrument can do.

4 4

T Y PE 155 2B SOUND LE V EL CAL I BRA T O R

A convenient accessory for making acoustical checks on the over-a ll sensitivity of a soundlevel meter, including microphone (whether ceramic, crys tal, dynamic or condenser) and circuitr y, operating as a unit.

TYPE 1307 A TRANSISTOR OSCILLATOR

Type 1307 A Transistor Oscilla t or especially designed for use with the Calibrator above.

Serves as both the oscillator and input volt meter in calibrations.

T Y PE

155 l~ C

S O UND-LEVEL METER

Meets all specifications of the American Standards

Association. Range is 2 4 to 150 db above 0.0002 pbar with better than 1-db accuracy . Complete l y se lfcon tained calibration circuit (no 115-vo1t li ne nee d ed). A new sensitivity adjustment, calibrated directly in terms of microphone sensitivity, makes for convenient use of accessory microphones for spec i a l ized measurements.

Uses new ceramic microphone that withstands temp eratures f r om -30° to 95oc and h u midit i es to 100% .

153 1 -A STROBOT A c® ELECTRONIC S T ROBOSCOPE

New l ong-throw, narrow-beam light reaches into interior of operating equipment . Flash duration only one to s ix millionths of a second

--freezes rapidly rotating objects (practically no blur) permitting observation of f i ne details imposs i b l e to see with other stroboscopes .

110 to 25,000 rpm using multiple image techniques. Unit is completely self-contained and operates from l15-volt ac power.

TYPE 1560 P34 TRIPOD A N D EXTENSION CABLE

To mount the Type 1 560 P3 PZT Microphone. It i ncl udes th e Type 1 560-P32 Tripod and the Type 1560 P73 25 foot

Ext e nsion cable. A 100-foot cable (Typ e 1560 P73B) is also available separately .

GENERAL RADIO COMPANY

WEST CONCORD , MASSACHUSETTS 01781

617 3 6 9 - 4 4 0 0 617 6 4 6 - 7 4 0 0

SALES ENGINEERING OFFICES

METROPOLITAN

NEW YORK*

845 Brood Avenue

Ridgefield , New Jersey 07657

Telephone NY 212 964-2722

N J 201

943 3 1 40

SYRACUSE

Pi ckard Building

fast

Molloy Rood

Syracuse, New York

I

32 11

Telephone 3 1 5 454-9323

NEW ENGLAND*

22 Boker Avenue

West Concord, M assachusetts 01781

Telephone 617 646 0550

PHILADELPHIA

Fort Washington

Ind us t rial Pa rk

Fort Washington, Pennsylvania 1 9034

Telephone 2 1 5 646 8030

WASHINGTON*

AND BALTIMORE

11420 R oc kv ille Pike

Rockville , Maryland 20852

Telephone 301 946 -

I

600

ORLANDO

I

13 Eost

Colonial

Drive

Orlanda, Florida 3280 1

Telephone

305 425 4671

• R epair services

a r e

o voi loble at the se dis t ric t offi ces.

CHICAGO*

9440 W .

Foster Avenue

Chicago,

Illinois 60656

312

992 0800

CLEVELAND

5579

Pearl

Road

Cleveland , Ohio 44 1

29

T elephone 216 886 · 0150

LOS ANGELES*

1 000

North

Seward

S tr eet

l os Angeles, California 90038

Telephone 213 469

620 1

SAN FRANCISCO

626 Son An t onio

Road

Mountain

Vi e w ,

California

94040

Te l ephone 4 1 5 948 8233

DALLAS*

2600 Stemm ons

Freeway ,

Suite 2 10

Dallas, Texas

75207

Telephone

214 637

2240

TORONTO*

99

Floral Parkway

T oronto 1 5 , On t ario , Canada

T elephone 416 247-2 171

MONTREAL

12 55 laird Boulevard

T

own of Mount

Royal,

Quebec,

Canada

Telephone 5 1 4 737-3673

OTTAWA T ele ph one 613 233-4237

General Rad i o Co m pa ny (Overseas) ,

BOOB

Zurich , Swi tzerland

Genera l Radio Company (U .

K.) Limited , Bourne End , Buckingham s hire , Engl a nd

Representatives in Principal Overseas Cou ntri es

Printed i n USA

General Radio 1564-A, 1564-9820, 1911-A, 1560 P5, 1560 P6, 1560 P52, 1560 P41, 1560 P40, 1560 P40H, 1560 P40J, 1560 P40K, 1552 B, 1557 A, 1551 C, 1553 A, 1521 B, 1531 A, 1560 P35, 1560 P76, 1564 2020, CAP 22 Instruction Manual

Assistant Bot

INSTRUCTION MANUAL

1564-A

SOUND AND VIBRATION

ANALYZER

INSTRUCT ION MANUAL

1564-A

SOUND AND VIBRATION

ANALYZER

WEST CONCORD, MASSACHUSETTS, USA

TABLE OF CONTENTS

SPECIFICATIONS

Section 1

INTRODUCTION

•

Section 2

OPERATING PROCEDURE

60

"""

r--

r---....

CONFIDE~CE

'

-·

TABLE 2.

METER SPEEDS OBTAINABLE WITH VARIOUS SETTINGS

OF THE FREQUENCY MULTIPLIER (See Text)

·r

Section 3

PRINCIPLES

OF OPERATION

IJIW

IHilillililillilllliifllililll,

Section

SERVICE AND MAINTENANCE

"'

PARTS LIST

±1%

,,

rF·

•

~""

40

APPENDIX

TYPE 1560-PS MICROPHONE AND

TYPE 1560-P6 MICROPHONE ASSEMBLY

~ANDOMI

MIICROPH~NE

1!··:~ lftf~~

ACCESSORY INSTRUMENTS

GENERAL RADIO COMPANY

SALES ENGINEERING OFFICES

Key Features

Frequently Answers and Questions

How to calibrate the analyzer for use with the Type 1560-P52 Vibration Pickup?

How to calibrate the analyzer for use with a microphone?

What is the effect of the presence of the observer and the instrument case on the sound field?

Related manuals

General Radio

1521 BQ1

GenRad

1971-9601

General Radio

CAP 22

General Radio

1565-B Sound-Level Meter

General Radio

1565-B Series

General Radio

Type 1557-A

General Radio

1565-A

General Radio

1560 Pll S2

General Radio

Type 1308-A 1308-A

General Radio

1551-B

GENERAL RADIO COMPANY