Lake Shore 234 User Manual
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Contents
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Lake Shore Model 234/234D User’s ManualService 5-1CHAPTER 5SERVICE5.0 GENERALThis chapter covers General Troubleshooting in Paragraph 5.1, Model 234Connectors in Paragraph 5-2, CalCurve Field Installation in Paragraph 5.3,and Calibration in Paragraph 5.4.5.1 GENERAL TROUBLESHOOTING5.1.1 No Output (On-Board LED Off)Verify output of external power supply is +5 VDC. If not, replace the supply.If using the front panel input jack (J2), verify center post of connector comingfrom power supply is NEGATIVE. If not, correct wiring. If using front panelinput jack (J2), verify external power supply is regulated at +5 VDC and cansupply a minimum of 500 mA. Also verify that OUT+ and SHIELD are notconnected to each other.Due to extensive protection circuitry installed in Model 234, all the aboveproblems eventually cause the 1 A slow blow fuse to burn out. Aftercorrecting the cause, replace the blown fuse with identical size and type.5.1.2 Output Stops Before Reaching Upper LimitNormally caused by too high of a resistance from output monitoring device.Absolute maximum acceptable resistance is 500 Ω. Also verify that properrange DIP switch is selected.5.1.3 Resistance Readings Are IncorrectVerify correct voltage and current connections to the sensor. Parasiticresistances between the voltage and current connections inside the devicecan make the resistance measurement incorrect if the leads are connectedincorrectly.5.1.4 Open ConditionA sensor must be connected when power is applied. If not, an Open errorwill be displayed even if a sensor is re-connected. A power cycle must beperformed with the sensor properly connected before the error will becleared. |
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