GL90B PREAMPLIFIER WIRING GREAT LAKES MODEL 671
●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
◆FOR AUTOMATIC COMPENSATION, CONNECT A 3KΩ BALCO ELEMENT TO 4 & 5 ON THE PREAMP, AND PUT A 301Ω RESISTOR ACROSS TERMINALS 2 & 3 IN THE 671. OR, CONNECT A 300Ω NTC GREAT LAKES ELEMENT TO 2 & 3 IN THE 671, AND PUT A 3.01KΩ RESISTOR ACROSS TERMINALS 4 & 5 ON THE PREAMP. THE CHOICE DEPENDS ON WHAT TC ELEMENT YOU HAVE AVAILABLE.
●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-671 |
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200 KB |
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