Страница 1: ...al Model MAC 5lB I r and Cable Locator E Iagnetrc an l uaore Locato iE Manufactured By Schonstedt Instrument Company 1775 Wiehle Avenue Reston Virginia 22090 703 471 1050 TWX 710 833 9880 ro C a t CJ F Printed May 1985 ...
Страница 2: ...ator Operation Theorv of Ooeration Function Selection Turn On and Initial Setting Low Sensitivitv Operation High Sensitivity Operation Search Procedure Section III Magnetic Locator Application Notes Basic Sisnal Patterns Strongly Magnetized Markers Locatlig Maiholes Septic Tanks and Water Wells Locating Objects Under Snow or Water and Tlacinq Barbed Wire Searchins Areas Along a Chain Link Fence Lo...
Страница 3: ...nsitivity Set for High Range Searching with the Locator Signals from Vertical and Horizontal Targets X Pattern Provides Precision Locatins Raising the Locator Eliminates Unwanted Signals Signal Pattern From a Strongly Magnetized Marker Locating Manhole Covers Locating Water Well Casings Signal Pattern Provided by Septic Tank Handles 3 8 Locating Oblecis a t Sno o ut 3 9 Tracing Barbed Wire from Ol...
Страница 4: ...e Lobe Identification Technique Identification of Bends andJunctions Gas Line Isolator Bypassed with Shorting Wire Pedestal with Grounding Clip Installed Pedestal with Groundwire Removed Determining Approximate Depth of Target Page L 9 4 3 4 3 4 4 4 4 4 D 4 6 6 l 6 2 o t 6 5 6 6 4 3 4 4 4 5 4 6 4 7 4 B 4 9 4 10 5 I 5 2 D O 5 4 D D 5 6 D 5 8 5 9 4 6 D t 5 2 5 2 D t o J D D D D b b D 1 6 I Exploded ...
Страница 5: ...etermined using the 45 null point triangulation method Operation of the MAC 5IB in the cable locator mode is explained in Sections IV and V Magnetic Locator Mode The receiver is the only unit required for operation in the magnetic mode Set the receiver M C function switch to M adiust the sensitivity control and you have the best magnetic locator available Operation of the magnetic locator mode is ...
Страница 6: ...ansmitter tt t h t a registered trademark of Metrotech Corporation SPECIFICATIONS TRANSMITTER Operating Voltage Battery Life Output Frequency Audio Indicator Weight Operating Temperature Overall Size RECEIVER Operating Voltage Battery Life Output Frequency Weight Operating Temperature Overall Length 12 Volts eight C Cell batteries 50 hours intermittent operation at 70o F 82 5 kHz modulated at 382 ...
Страница 7: ... the following patents United Statesr 2 916 696 2 981 885 3 894 283 3 909 704 3 96I 245 3 977 07 2 4 I 10 689 4 161 568 4 163 877 4 258 320 and Design 255552 Canadar 637 963 673 375 1 006 915 1 037 121 and 1 141 003 Great Britain I 446 741 1 448 742 and 1 494 865 France 2 205 67L Germany 25 51 968 0 09 23 55 630 and 29 01 163 Other United States and foreign patents pending 1 3 ...
Страница 8: ...peaker Figure 2 l illustrates an application of the locator in which it is used to detect an iron marker of the type used for property line identification The magnetic field of the marker is stronger at sensor A than it is at sensor B As a result the frequency of the signal on the speaker is higher than the 40 Hz idling frequency which exists when the fieid strength is the same at both sensors q O...
Страница 9: ...areas where magnetic disturbances are encountered from nearby structures rocks sand or trash the control should be adjusted for lower sensitivity as illustrated in Figure 2 3 ON OFF SENSITIVITY M C FUNCTION swtTcH EARPHONES JACK Figure 2 2 Sensi ti aity Set Jor Normal Range Low Sensitivity Operation Unwanted background signals due to nearby magnetic objects may require that the effective range of ...
Страница 10: ...ay produce unwanted changes in the signal frequency Therefore a watch worn on the the wrist of the hand holding the locator should be removed Avoid bringing the locator close to your shoes since they might contain magnet ic iraterial To obtain maximum area coverage the locator should be swept from side to side with the small end of the instrument kept close to the gro und A higher frequency tone f...
Страница 11: ...target and over the ends of a horizontal target The X pattern is ideal for pinpointing small objects A 1 1 4 inch PK nail buried up to 8 inches can be located so precisely with this technique that it can be uncovered using a l 2 inch star drill Prooides Precision Locatine If you find more then one signal in the vicinity of a target just raise the locator several inches higher Any signal that disap...
Страница 12: ... variation in tone frequency when the locator is moved over the marker When moving the instrument from A to B the frequency of the tone increases and then suddenly decreases at B From just beyond B the frequency of the tone increases sharply becomes very high directly over the marker and decreases just before reaching C From C to D the pattern is the reverse of that from A to B It is obvious that ...
Страница 13: ...e cover Turn the sensitivity down all the way and you can easily trace theedge ofcovers near thesurface Locating depth ranges up to 8 feet The great length of a well casing provides a strong field at the surface that makes it easy to locate casings buried up to 15 feet deep Figure 3 6 Locating Water WelI Casinss The MAC SIB receiver can be used to precisely locate the metal handles or reinforcing ...
Страница 14: ...now or Water You can often trace barbed wire from old fence lines buried just beneath the surface Even if the wire is only a trail of rust it can still be detected near the surface Tip the locator a little lower than usual but not parallel with the ground First examine trees for bench marks and bits of embedded barbed wire Then hold the Iocator narallel with the direction of the rvire at a Jt4 A 4...
Страница 15: ...nce Fi gure 3 10 Searching in the Vicinity oJ a Chain Link Fence Perform the search by moving along the fence keeping the end a constant distance from the fence When a point 1 5 8 inches from the end of the locator is directly over the stake the signal will drop abruptly as shown in Figure 3 11 Any variation in the position of the locator will produce an abrupt rise in the frequency of the tone 6 ...
Страница 16: ...h should be performed as follows 1 Adjust the sensitivity Ievel for maximum 2 Hold the locator vertically approximately 1 to l Il2 feet above the surface 3 Walk along without turning or tilting the locator 4 Mark the locations where the maximum signal levels occur 5 Return to an area of maximum signal strength and hold the Iocator several inches above the surface The sensitivity will probably have...
Страница 17: ...rates an alternating circumferential field around the cable This alternating field induces a signal into the receiver s sensor As the receiver is moved back and forth across the cable in a search pattern the pitch of the audio output from the receiver increases and decreases The heavy line in Figure 4 2 represents the increase and decrease in pitch of the audio signal as the receiver is moved back...
Страница 18: ...erred to as lines throughout Sections IV and V Transmitter Turn On and Battery Check Set the ON OFF switch to ON and listen for a steady beeping sound If a beeping is not heard the batteries must be replaced as described on page 6 3 CARRYING CASE CONDUCTION ACCESSORY ON OFF SWITCH JACK TRANSMITTER ELECTRONICS Figure 4 3 Transmitter Controls to ...
Страница 19: ...or water pipe is accessible the tracing signal can be applied directly to the target line Plug the conductive cable assembly into the transmitter accessory jack and urn the power _switch to ON Inserting the plug automatically disables the inductive transmitter and applies exciting current to the cable clips Connect one cable clip to i conductive portion of the line Drive the ground stake into the ...
Страница 20: ...On Set the M C switch to C and adjust the ON OFF Sensitivity control for mid position as shown in Figure 4 7 The volume level is preset If the receiver is turned on when located within 15 feet of the transmitter the receiver s speaker will emit a siren like sound indicating that the receiver is picking up the tracing signal directly from the transmitter through the air The sensitivity will have to...
Страница 21: ...ransmitter over the target line and turn the Dower switch to oN A steady beeping will be heard that indicatis the transmitter is operational Moveapproximately 30 feet away from the transmitter along the suspected target line before turning on the receiver This will ensure that the receiver is not receiving tf e signal through the air directly from the transmitter Set ti e ru function switch to c a...
Страница 22: ...nductioe Mode Tracing Tracing Conductive Mode In this mode the transmitter is physically connected to an exposed conductive section of the target line using the conductive cable assembly and the ground stake After the two clips are connected to the line and to the ground stake good electrical contacts are essential the procedure for using the transmitter and the receiver is the same as for the ind...
Страница 23: ...g traced any time a tracing signal is induced on a target line the same signal wiil be induced on nearby utility lines which may cause some confusion when trying to identify the null Conductive Coupling This is the most reliable way of applying the tracing signal A good electrical contact between the clip and the conductive portion of the target line is essential lf necessury rr a file to clean of...
Страница 24: ...e line that has a good clean null equal strength lobes on both sides Move the transmitter to this spot Confirm that this is the target line by back tracking with the receiver to the first site of the transmitter and checking for a null This procedure of leapfrogging the transmitter is also the standard method for extending the tracing range on electrically poor or leaky lines ii Figure 5 3 Reposit...
Страница 25: ... pattern E Figure 5 4 Single Lobe ldentiJication Technique Bends and Junctions A variation of the two line single lobe identification problem just described occurs when the line being traced has a bend or junction As the receiver is brought near a bend or junction the tracing signal becomes difficult to interpret When this occurs walk a 20 foot circle around the spot where the signal becomes confu...
Страница 26: ...d even classified as to type by the conventional spacing of joints Power mains and some 60 Hz service drops can also be identified by a burbling sound that peaks u hen the receiver is directly over the power line As the operator becomcs more familiar with the MAC SlB System switching between the M and C functions when clutter is encountered will become an invaluable tracing aid Isolators and Signa...
Страница 27: ... the shield inside the pedestal is not required unless the cable shares a trench with power cables If there is no ground wire it is recommended that a wire and clips as shown in Figure 5 7 be connected from the cable shield to the pedestal before using the inductive mode to excite the target cable This will greatly improve the strength of the inducted tracing signal GROUNDING CtIP Figure 5 7 Pedes...
Страница 28: ...ng Target Depth by Triangulation The receiver can be used in the traditional triangulation method to determine the approximate depth of a target as illustrated in Figure 5 9 However when using this method it is necessary to take into account the fact that the center of the cable sensor is located l1 inches up the receiver tube from the black tip When the position of the target has been determined ...
Страница 29: ...Target NOTE Depth readings should be taken on both sides of the line at a spot where the lobes have the same signal strength This procedure will help reduce any error in depth estimation caused by a distorted tracing signal due to interference 5 7 ...
Страница 30: ...inue using the locator without interruption Replacement of Receiver Batteries The receiver is powered by four C cell batteries carried in a battery holder illustrated in the exploded view of the electronic assembly Access to the batteries is obtained by removing the two knurled nuts and sliding off the cover The four batteries are connected in series The proper polarities for the batteries are sho...
Страница 31: ...REMOVE FIRST BATTERY KEEPER Scrsw ne6d nol be removed COIL SPRINGS HERE BATTERY BOX BATTERIES COIL SPRING Figure 6 2 Replacement of Receirser Batteries 6 2 ...
Страница 32: ...attery holder The eight batteries are connected in series The proper polarities for the batteries their removal and installation sequence are indicated below Batteries must be removed and installed in the order shown In very cold weather alkaline batteries should be used SPAREBATTERIES BATTERY BOX TERMINALS REMOVE BATTERIES FROM ENDS OPPOSITE SPRINGS FIRST INSTALL BATTERIES AGAINST SPRINGS FIRST H...
Страница 33: ...s TRANSMITTER TROUBLESHOOTING GUIDE How to Check How to Fii No Sound Dead Batteries Batteries not making contact Broken wires Replace Check for contact corrosion Visually inspect Replace Clean Contacts Resolder Intermittent Sound Batteries not making contact Check for corrosion Clean contacts Service Information If your locator needs service you may return it to the dealer from which it wa s purch...
Страница 34: ... _ b E ZY 6 oo z I z I fi j 6 Tz 3u aO zz t o E U Y U c o z r UO Oo a i I o U c s F l o u J E l z Y z U U t _ a E F U F E L c o U E z E L a I U c a 9 U E uA U o 2 d o r N N N N Y 3 io o N N r Y N o T E U o J z F c a L L l p a d t L k_A NS v G i b D ...
Страница 35: ... E ul u o a o I z E F U U Y I o E U o J I E U F U E F l z o u J E l z Y tr U E UJ c F G u F F U o o E u o D n J U Y d o z l G o o 6 z F I L N o D N N N N o o N o N N E t E z o L s t A F 6 t L F ro IrJ r 6 6 ...
Страница 36: ...is warranty This warranty is effective for one vear after delivery to the original purchaser As a condition of this warranty the instrument must be returned by the orginal purchaser transporation charges prepaid and prove to our satisfaction to be defective If fault has been caused by misuse or abnormal conditions of operation repairs will be billed at cost Prior to repair in this instance a cost ...
