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Post by rrahman on Feb 12, 2020 16:36:44 GMT -5
Error 30 shows up every time I try changing temperature using Model 330....what can be done to solve this?
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Post by Lake Shore Jeff M on Feb 13, 2020 8:46:16 GMT -5
Error 30 appears when the Model 330 determines that the resistance of the heater is not what it should be based on the heater jumper selection which is shown in section 2.9 of the Model 330 User Manual and on the component layout in Figure 5-9. The Jumper selects either 25 or 50 Watt heater operation and each of these selections have a specific heater resistance range as follows:
When JMP9 is set to the 25W setting, the heater resistance must be between 10 Ohms to 450 Ohms When JMP9 is set to the 50W setting, the heater resistance must be between 35 Ohms to 450 Ohms
The first thing to do is disconnect the heater from the controller by unplugging the dual banana plug from the back of the instrument. Measure the resistance of the heater across the prongs of the plug looking toward the heater. If you measure less than 10 ohms, your heater is shorted and will not work with the 330. If you measure more than 450 ohms, again, the heater is defective and cannot work with the 330.
If you measure between 10 and 35 Ohms, remove the top cover and change the heater Jumper to the 25W setting.
Finally, if you measure more than 35 ohms and less than 450 ohms, the Model 330 has a defect and due to its age, we no longer offer repair service so you will need to look for a new controller.
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Post by rrahman on Feb 13, 2020 9:27:39 GMT -5
Finally, if you measure more than 35 ohms and less than 450 ohms, the Model 330 has a defect and due to its age, we no longer offer repair service so you will need to look for a new controller. If my heater on cryostat has more than 35 ohms resistance, shouldn't that mean that I need to change heater setting to 50 ohm jumper setting?? Will that not work?
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Post by Lake Shore Jeff M on Feb 13, 2020 10:52:41 GMT -5
Actually, resistances between 35 and 450 ohms will work with either setting. However, if you are set to 25W and the resistance goes above 25 ohms, you will see a reduced power output as the compliance voltage of 25V will be reached and the current will stop increasing.
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Post by rrahman on Feb 13, 2020 19:08:24 GMT -5
Actually, resistances between 35 and 450 ohms will work with either setting. However, if you are set to 25W and the resistance goes above 25 ohms, you will see a reduced power output as the compliance voltage of 25V will be reached and the current will stop increasing. The resistance and heater setting, I have checked......25 ohms setting with 26.8 ohms on the heater on the Cryostat ...it still gives error 30....when in low setting, the voltage across the heater is around 18V...when I hit the heater button it turns on.......reaches target temperature and then instead of lowering it, shows error 30.....any idea what might be happening?
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