Dukane 42A12D Manuale utente

TECHNICAL MANUAL

ULTRASONIC TEST SET

MODEL 42A12D

JUNE 15, 1998

REV 00

SEACOM DIVISION

DUKANE CORPORATION ST. CHARLES, ILLINOIS 60174 PHONE: 630/584-2300 FAX: 630/584-5154

DOCUMENT NO. 03-TM-0038 1998 DUKANE CORPORATION 199806-08SC

03-TM-0038 REV 00 PAGE i of i

Table Of Contents

SECTION

I General Information.......................................................................................................

1.1. Introduction....................................................................................................

1.1.1. General.............................................................................................

1.1.2. Symbols and Abbreviations...........................................................

1.2. General Description........................................................................................

1.2.1. Function...........................................................................................

1.2.2. Specifications...................................................................................

1.2.3. Block Diagram.................................................................................

1.3. Auxiliary Connections and Uses....................................................................

1.3.1. Audio Output....................................................................................

II Operation.....................................................................................................................

2.1. Operation........................................................................................................

III Maintenance...............................................................................................................

3.1. Battery Life.....................................................................................................

3.2. Battery Replacement.......................................................................................

3.3. Test Set Tuning..............................................................................................

3.3.1. Test Equipment..............................................................................

3.3.2. Tuning............................................................................................

3.3.3. Adjusting Frequency Range...........................................................

3.4. Test Set Schematic Diagram.........................................................................

3.5. Maintenance and Replacement Parts.............................................................

Figures

Figure 1.1. Ultrasonic Test Set Model 42A12D.........................................................

Figure 1.2. Test Set Block Diagram............................................................................

Figure 3.1 Tuning Components.................................................................................

Figure 3.2. Schematic Ultrasonic Test Set Model 42A12D.......................................

Tables

Table 1.1. Specifications 42A12D Ultrasonic Test Set..............................................

PAGE

03-TM-0038 REV 00 PAGE 1of 5

SECTION I

GENERAL INFORMATION

1.1. INTRODUCTION

1.1.1. GENERAL. This manual contains the description,

operation and maintenance of the 42A12D Ultrasonic Test

Set manufactured by Dukane Corporation, Seacom Division,

2900 Dukane Drive, St. Charles, Illinois 60174. See Figure

1.1.

1.1.2. SYMBOLS AND ABBREVIATIONS. All symbols

and abbreviations used in this manual are in accordance with

the ANSI Y14.15 and MIL-STD-12, respectively.

1.2. GENERAL DESCRIPTION

1.2.1. FUNCTION. The 42A12D is a battery operated het-

erodyne type receiver tunable over the ultrasonic frequency

range of 30 to 45 kHz. The test set was designed primarily

as a self-contained, hand-held functional tester for testing

underwater acoustic beacons. Utilizing the internal micro-

phone and loudspeaker, the Test Set can perform an opera-

tional test on a beacon without removing the beacon from its

mount on the aircraft.

1.2.2. SPECIFICATIONS. The specifications for the

42A12D are given in Table 1.1.

TABLE 1.1. SPECIFICATIONS 42A12D

ULTRASONIC TEST SET

Size.......................................3.0" (7.62 cm) x 4.5"

(11.43 cm) x 2.25" (5.72 cm)

Weight...............................13 ounces (368 grams)

Tuning Range....................................30 to 45 kHz

Battery*................................................9V (Qty 1)

Gain.................................87 dB min. at 37.5 k Hz

Noise.............................Less than one mW across

10 ohm load

Undistorted Output........................... 250 mW into

. 10 ohm load

Microphone Sensitivity.................-150dB re 1uPa

Battery Life......................................30 to 40 hours

Audio Output Jack........................Switchcraft type

43A, permits operation

into headphones, oscilloscope,

etc. in place of internal

loudspeaker (impedance

10 ohm nominal)

* NEDA Type 1604A.

Figure 1.1. Ultrasonic Test Set Model 42A12D.

03-TM-0038 REV 00 PAGE 2OF 5

Figure 1.2. Test Set Block Diagram.

1.2.3. BLOCK DIAGRAM. Figure 1.2. is a block diagram

and Figure 3.1. is the schematic diagram of the test set. The

microphone detects a beacon signal which is amplified and

fed into the mixer. The tunable oscillator frequency is also

fed into the mixer. When tuned above or below the incom-

ing signal, the difference frequency is the resultant output

from the mixer, and will be in the audio range when the dif-

ference is within 1000 to 3000 Hz. When both frequencies

are the same, the difference frequency is zero, hence no out-

put from the mixer. The signals coming out of the mixer are

amplified by the audio amplifier, where most of the gain of

the test set is provided.

1.3.1 AUDIO OUTPUT.

1.3. AUXILIARY CONNECTIONS AND USES

A. The test set AUDIO OUTPUT jack circuit is designed to

work into a load impedance of approximately 10 ohms

which is ideal for attachment of low impedance head phones.

Operation into higher impedance such as oscilloscopes, me-

ters, chart recorders or other types of readout equipment is

permissible. No DC potential is present on the AUDIO

OUTPUT jack.

CAUTION

A SHORT ACROSS THE AUDIO OUTPUT

JACK MAY CAUSE DAMAGE TO THE TEST

SET CIRCUITRY.

CAUTION

TEST SET IS NOT WATER-PROOF OR

SPLASH PROOF. SOME FORM OF

PROTECTION SHOULD BE PRO-VIDED

WHERE SPLASH CONDITIONS EXIST.

03-TM-0038 REV 00 PAGE 3of 5

SECTION II

OPERATION

2.1. OPERATION

A. Turn the GAIN control to a fully clockwise position. A

pronounced background noise should be present. Lack of

noise may indicate a dead battery. Should this occur, replace

battery before resuming operational testing. See Mainte-

nance Section 3.2.

B. Set the TUNING control to approximately midscale.

Rubbing fingers in front of microphone should produce a

rushing noise from speaker.

C. Actuate a beacon under test by immersing the water

switch in tap water, or by shorting the water switch terminal

to the case by means of a shorting tab. The beacon need not

be removed from its mount on the aircraft to perform opera-

tional testing.

D. Set the GAIN control at a comfortable listening level.

E. Point the microphone of the Test Set towards the water

switch end of the Beacon for best results. If the Beacon is

mounted, position the Test Set for maximum unobstructed

signal. Beacon operation will be indicated by an audible

pulsing tone.

F. The tuning control permits reception of an acoustic signal

operating anywhere within the 30 to 45 kHz frequency

range. The audio response is peaked at about 3200 Hz;

therefore, the test set should be tuned to produce an output

signal of approximately this frequency to achieve greatest

sensitivity.

CAUTION

TO CONSERVE BATTERY LIFE, GAIN

CONTROL SHOULD BE SET TO OFF

POSITION WHEN TEST SET IS NOT IN

ACTUAL USE.

03-TM-0038 REV 00 PAGE 4OF 5

SECTION III

MAINTENANCE

3.1. BATTERY LIFE

With intermittent usage, battery operating life will be ap-

proximately 30 to 40 hours depending on the type of and

manufacturer of the battery. In any event, battery should be

replaced when its load voltage has dropped to 7 volts (Test

Set turned ON and GAIN control set to minimum).

3.2. BATTERY REPLACEMENT

Any 9-volt battery may be used, but longer service will be

obtained by the use of premium batteries such as NEDA

Type 1604A. The battery is accessible in the Test Set by

removing the single screw on the bottom of the case and

dropping out the chassis. A snap type connector facilitates

change of battery and prevents reversal of polarity, but for

additional safety, always turn GAIN control knob to OFF

position before making battery change.

3.3. TEST SET TUNING

The following test equipment and procedures should be fol-

lowed to tune and adjust the frequency range of the 42A12D

Test Set.

3.3.1. TEST EQUIPMENT A. Test Oscillator which is

accurate at 30 kHz, 37.5 kHz and 45 kHz and provides sev-

eral volts output.

B. Output monitor and VTVM.

C. Regulated current limiting power supply capable of 9V

and 200 mA output current.

D. Necessary interconnecting cables to connect input, out-

put and power to test set.

D. Work surface with insulated electrostatic shield plate

(see Figure 3.2.) connected to common (battery negative

terminal) of equipment.

3.3.2. TUNING A. Turn the GAIN control to OFF, loosen

the screw on the back of the case and remove the test set

from the housing. Disconnect the battery snap and remove

battery. Place test set GAIN control side up on the insu-

lated side of test plate. Pre-set power supply to 9V DC.

B.. Connect the audio oscillator to the wiper and ground

leads of the gain pot.

Figure 3.1. Tuning Components.

C. Set the Audio Oscillator to 37.5 kHz, with an output of

35 mvrms.

D. Monitoring the Audio Output Jack, adjust the TUNING

knob for peak signal at either the upper or lower peak. With

the GAIN pot at MAX, at least 1.5 Vrms should be ob-

served

E. Tune the slug of T1 for peak signal output. The response

will be very subtle. Locate adjustment T1 on Figure 3.3.

CAUTION

USE AN INSULATED TOOL TO MAKE THIS

ADJUSTMENT

03-TM-0038 REV 00 PAGE 5of 5

3.3.3. ADJUSTING FREQUENCY RANGE.

A. The frequency range for the Test Set is 30 to 45 kHz.

The audio output is tuned for approximately 3200 Hz.

B. Set the TUNING knob to the maximum frequency (45

kHz). Place an oscilloscope probe or frequency counter on

the output of the local oscillator circuit, pin 14 of U2. See

Figure 3.3.

C. Monitoring the frequency, adjust R16 for the maximum

L.O., approximately 42 kHz or as high as possible.

D. Set the TUNING to the minimum frequency (30 kHz).

E. Tune R22 for the minimum L.O., approximately 27 kHz.

F. Repeat steps C through E as many times as necessary

until both ends are tuned.

3.4. TEST SET SCHEMATIC DIAGRAM.

Figure 3.2. is the schematic diagram for the 42A12D Ultra-

sonic Test Set.

3.5. MAINTENANCE AND REPLACEMENT PARTS.

A. Tuning or Gain

1 control knob....................P/N 809-440-0004

B. GAIN control R13.......................P/N 601-315

C. TUNING control R23..................P/N 601-372

D. Battery.............................NEDA Type 1604A

BT1

SW1

SWPOWER

R13

10K

68 R1

33.2KR7

15KR5

68.1K

221K

2N5086

.01

2N5088

R29

75K

68.1K

2N5088

.01

C15

.01

100K

2.7MH

R17

750

R19

75K

1408

2.7MH

R30

2.7

C10

C18

AUDIOOUTPUT

R31

10 R32

LS1

SPEAKER

C11

10 C12

330

C13

C14

.02 R20

.047

R18

120

LM386M

R11

6.8

R10

47.5K

R12

4.75KC8

.01

3.16K

3.32KC4

1N4005 T1

1408

2N5088

150

1N4005

TRANSDUCER

R24

2.00K

1N4454

1N4454 R28

7.15K

13 14

1U2D

LF444

R27

22.6K

1U2B

LF444

C17

470pFR26

56.2K

R25

56.2K

1U2C

LF444

R22

10K

R15

511K

R14

511K

560pF

U2A

LF444

C16

R23

100K

R16

50K

R21

47.5K

UNLESSOTHERWISE SPECIFIED;

1.ALL RESISTORSAREINOHMS,K=1,000,

2.CAPACITORSAREINMICROFARADS.

M=1,000,000,1/3WATT +/-1%.

NOTES:

Figure 3.2 Schematic Ultrasonic Test Set Model 42A12D

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