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Ludlum Measurements 336641, Manual

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LUDLUM MODEL 3A 

SURVEY METER 

 
 

June 2020 

Serial No. 336641 and Succeeding  

Serial Numbers 

Summary of Contents for 336641

Page 1: ...LUDLUM MODEL 3A SURVEY METER June 2020 Serial No 336641 and Succeeding Serial Numbers ...

Page 2: ...LUDLUM MODEL 3A SURVEY METER June 2020 Serial No 336641 and Succeeding Serial Numbers ...

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Page 4: ... anyimplied warranty of merchantability or fitness which extend beyond the description of the face there of If the product does not perform as warranted herein purchaser s sole remedy shall be repair or replacement at the option of Ludlum Measurements In no event will Ludlum Measurements be liable for damages lost revenue lost wages or any other incidental or consequential damages arising from the...

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Page 6: ...ONS 1 4 OPERATING PROCEDURES 2 5 CALIBRATION 2 5 1 Calibrating CPS Scale 2 5 2 Detector Operating Point 2 5 3 Alarm Circuit 3 6 MAINTENANCE 3 7 PARTS LIST 4 Model 3A Survey Meter 4 Main Circuit Board Drawing 464 x 639 4 Calibration Board Drawing 363 x 650 5 Wiring Diagram Drawing 363 x 653 5 DRAWINGS AND DIAGRAMS 7 ...

Page 7: ...Model 3A Survey Meter page iii ...

Page 8: ...ange multipliers of X0 1 X1 Xl0 and X100 THRESHOLD 40 10 mV AUDIO built in unimorph speaker with an ON OFF switch HIGH VOLTAGE externally adjustable from 400 to 1500 volts RESPONSE 4 or 22 seconds 10 90 of final reading LINEARITY 10 of true value ALARM INDICATION audible and visual indication when above alarm threshold ALARM RANGE 0 to off scale for each range multiple latching alarm BATTERY DEPEN...

Page 9: ...Note The enter post of the battery is positive Close the battery box lid Switch the range switch to BAT The meter should deflect to the battery check portion of the meter scale If the meter does not respond recheck that the batteries have proper polarity Connect the cable to the instrument and detector Turn the instrument range switch to X100 Expose the detector to a check source The speaker shoul...

Page 10: ...h a check source prior to each use A reference reading should be obtained when exposed to the check source in a constant and reproducible manner at the time of calibration If the instrument response differs from the reference reading by more than 20 the instrument should be returned to a calibration facility for maintenance repair or recalibration as required Recalibration should be accomplished a...

Page 11: ...5 Q15 MPSW51AG 05 5765 Q44 2N3904G 05 5755 Q96 2N3904G 05 5755 Q145 2N4402BU 05 5763 Q200 2N4402BU 05 5763 Q201 2N7000 05 5820 Q213 2N3904G 05 5755 INTEGRATED CIRCUITS U1 CMXT3904TRLF 05 5888 Ref No Description Part No U2 TLC372 06 6265 U3 CD4098 06 6066 U4 CMXT3906TRLF 05 5890 U5 ICM7555 06 6136 U6 TLC27M7IP 06 6248 U7 MAX631 06 6249 U8 CMXT3906TRLF 05 5890 U9 U11 CMXT3904TRLF 05 5888 U101 LM385Z...

Page 12: ...Ref No Description Part No Wiring Diagram Drawing 363 x 653 AUDIO DS1 UNIMORPH 6030 21 9251 CONNECTORS J1 1 640442 5 MTA100 13 8383 J2 640442 2 MTA100 13 8178 J3 640442 5 MTA100 13 8140 J4 640442 4 MTA100 13 8170 J5 RECPT UG706 U SCREW IN C 13 7751 SWITCHES S1 PA 600 210 08 6501 S2 S3 7101 SYZ QE 08 6511 S4 30 1 PB GRAYHIL 08 6517 BATTERY B1 B2 DURACELL D 21 9313 MISCELLANEOUS DS1 BULB 338 21 9307...

Page 13: ... HARNESS PORT CAN WIRES 8363 462 PORT HANDLE ROLLED W SCREWS 4363 139 PORT HANDLE FOR CLIP W SCREWS 7363 203 REPLACEMENT CABLE STD 1 m 39 in 40 1004 CLIP 44 3 TYPE W SCREWS 4002 026 01 CLIP 44 7 TYPE W SCREWS 4010 007 01 CLIP 44 6 TYPE W SCREWS 4010 008 01 ...

Page 14: ...D DIAGRAMS Main Circuit Board Drawing No 464 x 639 Main Circuit Board Component Layout Drawing 464 x 642 2 sheets Calibration Board Drawing No 363 x 650 Calibration Board Component Layout Drawing 363 x 651 Wiring Diagram Drawing No 363 x 653 ...

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