V1 PREAMPLIFIER WIRING GREAT LAKES MODEL 70
●GENERAL
◆OUTPUT TO THE INSTRUMENT FROM THE PREAMP IS UNITY GAIN, INVERTED POLARITY.
◆IF THE TERMINAL STRIP NUMBERS FOR THE MODEL 70 DO NOT AGREE WITH THIS DRAWING, THEN FOLLOW THE INDICATED COLOR CODE
◆WHEN A COMBINATION ELECTRODE IS USED, REFERENCE CONNECTION IS MADE THROUGH THE BNC CONNECTOR.
◆IF A SEPARATE REFERENCE CELL IS USED, CONNECT IT TO TERMINAL 5 OF THE PREAMP, AND LEAVE THE WIRE IN PLACE FROM 5 TO COMMON.
●TEMPERATURE COMPENSATION
◆NORMAL MODEL 70 TC IS ACCOMPLISHED WITH A NEGATIVE COEFFICIENT THERMISTOR THAT READS 301Ω AT 25°C, CONNECTED AS SHOWN.
◆THE V1 AMPLIFIER CAN PERFORM AUTOMATIC COMPENSATION USING A 3KΩ AT 25°C BALCO ELEMENT, WITH A SLOPE OF +13.5Ω/°C.
◆IF YOU WISH TO USE A 3KΩ BALCO ELEMENT, THEN THE 3.01KΩ RESISTOR MUST BE REMOVED, AND THE BALCO CONNECTED IN ITS PLACE. NEXT, PLACE A 301Ω RESISTOR ACROSS 6 AND 7 IN THE MODEL 70 INSTRUMENT CASE.
◆ONLY ONE AUTO TC CAN BE USED AT ONE TIME. REPLACE THE UNUSED ONE WITH A FIXED RESISTOR HAVING THE SAME VALUE AS THE UNUSED ELEMENT AT 25°C.
●SHIELDING
◆DON'T LET ANY OF THE LEADS, OR THE BNC CONNECTOR TOUCH METAL PIPING, CONDUIT, OR OTHER EARTH GROUNDS. THIS WILL CREATE A"GROUND LOOP" AND CAUSE VERY UNSTABLE READINGS.
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Outline Dimension Drawing |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2011/3/25 |
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REV.A |
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V1-70 |
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224 KB |
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