GL90B PREAMPLIFIER WIRING GREAT LAKES MODEL 672
●GENERAL
◆OUTPUT TO THE INSTRUMENT FROM THE PREAMP IS UNITY GAIN.
◆WHEN A COMBINATION ELECTRODE IS USED, REFERENCE CONNECTION IS MADE THROUGH THE BNC CONNECTOR.
●TEMPERATURE COMPENSATION
◆CONNECT A 3KΩ @25°C BALCO TC ELEMENT TO TERMINALS 4 AND 5 OF THE PREAMP, AS SHOWN. THEN PUT A 301Ω RESISTOR ACROSS 4 AND 5(BLACK AND YELLOW) IN THE INSTRUMENT.
●EARTH GROUNDING WARNING
◆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 OR OFF-SCALE READINGS. TO CHECK FOR A GROUND LOOP, DISCONNECT THE BNC AND PUT AN OHMMETER BETWEEN TERMINAL 5 OF THE PREAMP AND A GOOD EARTH GROUND. YOU SHOULD READ INFINITY. ANY OHMS READING AT ALL INDICATES A SHORT TO GROUND WHICH MUST BE FOUND AND ELIMINATED.
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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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GL90B-672 |
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194 KB |
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