Страница 1: ...INSTRUCTION MANUAL Model GA 52 Magnetic Locator SCHONSTEDT IIISTRUMENT COMPANY ft l lTT5WiehleAvenue o Reston Virginia 22ogo r r ...
Страница 2: ...INSTRUCTTON MANUAL Model GA 52 Magretic Locator MANUFACTURED BY Schonstedt I nstrument Company 1775 Wiehle Avenue Reston Virginia 22090 703 471 1050 TWX 710 833 9880 Printed September 1977 ...
Страница 3: ...ield sensors These sensors acknowledged to be the world s finest make possible the unequalled performance of the locator TABLE OF CONTENTS OPERATION Introduction Turn On Volume and Sensitivity Settings Low Sensitivity H igh Sensitivity Search APPLICATION NOTES Basic Search Patterns Strongly Magnetized Markers Manholes Septic Tanks Wells Barbed Wire Water Snow Along Fences Valve Boxes Cast lron Pip...
Страница 4: ... emitted by a loudspeaker The figure below illustrates an application of the locator in which it is used to detect an iron marker for a property corner In the illustration the magnetic field of the iron marker is stronger at sensor A than it is at sensor B As a result the frequency of the signal on the loudspeaker is higher than the idling frequency 65 Hz which exists when the field is the same at...
Страница 5: ...cator can be oriented in any direction without producing a sig nificant change in frequency of the tone from its idling rate In cold weather it may be necessary to oFF PoSlTloN turn the SENSITIVITY knob slight ly more in the clockwise direction to obtain normal range When headphones are used no variation in sound volume is provided by turning the VOLUME Control Unwanted background signals due to n...
Страница 6: ...ed tone frequency changes To avoid such problems either remove the wrist watch or use the other hand Also avoid bringing the locator close to your shoes since they might contain magnetic material 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 ground A higher frequency tone will be heard from the loudspeaker when ...
Страница 7: ...get Using the X pattern allows precise location of small objects A 1 1 4 P K nail marker can be located at depths from 4 to 8 lt can be un covered by using a 1 2 star drill A trick that helps if you find more than one signal when you should find only one is to raise the locator a few inches Any signal that dis appears is probably not the one you are looking for The signal from a rusty bolt or othe...
Страница 8: ...nd then suddenly de creases at B From just beyond B the tone frequency increases sharply becomes very high over the marker and decreases just before reaching C From C to D the pattern is the reverse of that from A to B lt is obvious that the locator must enter the B C region Otherwise the marker might be assumed to be between A and B or C ahd D The phenomenon is explained by the fact that the loca...
Страница 9: ... a oo Qe 4o oavt APPLICATION NOTES cont MANHOLES SEPTIC TANKS WELLS The locator can be used to precisely locate the metal handles or re inforcing bars on septic tank covers buried from 2 to 4 feet The great length of a well casing provides a strong field at the surface that permits easy locating of casings buried from 10 to 15 feet ffi fl o o oo I o rlgffi a a o o u v oro OUTPUT SIGNA e a on f o o...
Страница 10: ...he target b n o o ll i o NOTES cont VVATER SNOW Examine trees for bench marks and embedded barbed wire of old fence lines Hold the locator parallel with the direction of the wire 4 ka 2 o i t oo You can often trace barbed wire of old fence lines beneath the surface Even if the wire is only a trail of rust it can be de tected near the surface Tip the locator a little lower than usual but not parall...
Страница 11: ... perpendicular to the fence This orientation assures that the upper sensor is kept away frorn the fence Search by moving the locator along the fence keeping the end a constant distance from the fence When a point 1 5 8 from the end of the locator is directly over the stake the signal will drop abruptly as shown below Any variation in position will produce an abrupt rise in the frequency of the ton...
Страница 12: ...s follows 1 Turn sensitivity to maximum 2 Hold locator vertical approximately 1 1 112 feet above the surface 3 Walk without turning or tilting the locator 4 Mark the approximate locations of signal maximums 5 Return to the marked area and probe near the surface for signal maximums To do so it may be necessary to reduce the sensitivi ty of the locator Four inch pipe can be located at 4 to 8 foot de...
Страница 13: ...tion we ask that you refer to the troubleshooting guide located on page 12 This lists a few possible problems that can generally be corrected in the field so that you will be able to continue using the locator without interruption The GA 52 is powered by four C cell batteries carried in a battery holder illustrated in the exploded view of the electronic assembly below Access to the batteries is ob...
Страница 14: ...16 REMovEFrRSr it INSTALL FIRST BATTERY KEEPER Screw need not COIL SPRING HERE be removed BATTERY BOX TERMINALS COIL SPRING HERE BATTERY BOX BATTERIES HEADPHONE JACK BE SURE THAT THESE TERMINALS DO NOT MAKE CONTACT WITH EACH OTHER COIL SPRING 1 l ...
Страница 15: ...ications subject to change without notice Input Power Battery Life Output Weight Operati ng Temperature Length Supplied by four C cell batteries 1 V each 50 hours of intermittent operation Approximate 65 Hz idle tone in speaker Tone fre quency increases or decreases with gradient field intensity Approximately 3lbs 1 36 kg OoF to 12ooF 18oc to 49oC 42 5116 in 107 4 cm l Waterproof Length 34 112 in ...
Страница 16: ...t ri q 3 t F oo E u o b u r N F z o U J E z Y o z U U E o t r o F o U F o tr o q F U N 9 z E o U o b u N o tr o UJ U N o U F F o x 00 oo oo oo oo o oo oo oo o oo t N o c tD6 oq 8E N ol o c o4 oc N6 o o o N Y EE O o o N o o o Y o o o N o o o N o o o o N t6 o o N a o o N o o o o o F N o o o o rt E o o o o o 9 E UGil l F I o M U e 5 N A T c v F E o E a o IJJ E t q 9 I I o I ...
Страница 17: ...nder this warranty This warranty is effective for one year after delivery to the original purchaser As a condition of the warranty the instrument must be return ed by the original purchaser transportation charges prepaid and prove to our satisfaction to be defective lf fault has been caused by misuse or ab normal conditions of operation repairs will be billed at cost Priorto re pair in this instan...
Страница 18: ...s 265 81 15 ...
