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Post by Lake Shore Jeff M on Sept 5, 2023 9:11:44 GMT -5
The issue you are reporting is not a feature that is in the Model 335, therefore, so other problem is causing the screen to go blank and the GPIB to stop working.
The only thing we can think of that would affect both the display and GPIB Interface would be an issue with the AC input to the transformer.
I recommend doing the following:
1. Check that the AC Input Voltage selection is correct for the voltage you have connected. 2. Remove the top cover and verify that all of the connections from the Transformer to the AC Input Module are tight and that the secondary connections from the transformer to the Main PCB are not loose.
If everything is good in the Model 335, possible switch the AC inputs between the 335's and see if the issue remains or moves to the other 335. If it moves, that indicates that your AC connection has an issue and may be dropping below the minimum voltage for the setting you have. If it remains on the same 335, then there is possibly an issue with the transformer or some other power section on the 335.
One you complete the verification and AC input change, let me know the results by sending an email to support@lakeshore.com and we can determine what is required to resolve the issue.
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Post by Lake Shore Jeff M on Sept 5, 2023 8:17:15 GMT -5
If the error comes on immediately after turning ion the heater, it is most likely an issue in the controller circuit which will require it be returned to the factory for a repair.
If the error appears after the heater starts to warm up the system that is indicating that there is a thermal short occurring in the system.
I recommend you contact the Lake Shore support team by sending an email to support@lakeshore.com. Provide the serial number of the Model 336 and a description of when the error appears. With this information we will be able to tell you what the options are to resolve the issue.
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Post by Lake Shore Jeff M on Sept 5, 2023 8:11:51 GMT -5
The temperature range of operation for the sensors shown in the Model 224 specifications is based on what is considered worst case conditions.
For the NTCRTD Cernox Sensor, the model 224 can read resistance values between zero and 100 kΩ. Based on typical calibration data, the CX-1010 sensor will reach 100 kΩ at approximately 0.3K. If you are able to source a Cernox sensor that has a resistance less than 100 kΩ at temperatures below 0.3K then it will work with the Model 224.
If you have a sensor that has a resistance below 100 kΩ at 100K, you can load that curve into the Model 224 and use the sensor. If you do not have a sensor that meets the 100 kΩ requirement, you can contact Quantum Design UK and Ireland and ask them to see if a custom sensor can be ordered that would meet your needs.
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Post by Lake Shore Jeff M on Aug 16, 2023 14:23:36 GMT -5
Just to be sure, what format is the curve you entered into the 372 in? Rox sensors require the curve points to be entered as the Log Ohm Base 10 of the resistance versus temperature in Kelvin. The points need to be entered in descending order in regards to temperature, point 1 is the highest temperature and the last poingt is the lowest.
The Model 372 uses the following formula for straight line interpolation: T=T0+((S-S0)×(T1-T0))/((S1-S0)) In this formula, S is the actual sensor reading, S0 & S1 are the sensor values directly above and below the reading and T0 & T1 are the associated temperature points.
Please send a copy of your curve to support@lakeshore.com so I can verify it is crrect and see if I can duplicate the issue you are reporting/
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Post by Lake Shore Jeff M on Jul 6, 2023 7:10:58 GMT -5
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Post by Lake Shore Jeff M on Jul 5, 2023 6:16:45 GMT -5
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Post by Lake Shore Jeff M on Jul 2, 2023 21:03:52 GMT -5
What you have found is correct, an input can only be assigned as the control input for one of the outputs at any given time.
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Post by Lake Shore Jeff M on Jun 27, 2023 6:51:31 GMT -5
The maximum compliance voltage the AC current source can provide is fixed at either 10 V or 100 V for the 1 µA to 10 mA ranges and 10 V only for the 100 mA range.
Interface Command: SOURce:CURRent[:SENSe][:VOLTage]:AC:VRANGE
Please review section 3.4.3.4.2 AC Voltage Compliance in the Model 155 User Manual for additional information.
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Post by Lake Shore Jeff M on Jun 15, 2023 14:54:34 GMT -5
The output percentage has to be more than 10% out in order to get a reasonable reading because those values are not calibrated. We didn’t want to false trigger a heater short or open. Also, if the heater is not steady, and is changing more than 4% each time through the loop, it will not calculate either.
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Post by Lake Shore Jeff M on Jun 15, 2023 14:27:06 GMT -5
1. The Query commands available on the USB interface do not have any effect on the scanning of the channels. The channel scanning is as you describe in question #3.
2. I need to investigate exactly how the filter works and will get back to you soon.
3. You are correct in how the scanning and data storage works. When all 8 channels are enabled, and none of them are using the NTCRTD 100K Ohm range, the respective channels are read every 400 ms and the data is stored in registers that are read out when the query command is received.
4. The 2.5 readings/second means that each channel is read 2.5 times a second or every 400 ms unless it is using the 100k ohm range where it doubles the scan time to 800 ms. Requesting data faster than every 400ms would result in the same readings being read as before.
5. The measurement operation is the same and what gets reported over the ProfiBUS is the data that is stored when the Master requests that the slave send it's data.
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Post by Lake Shore Jeff M on Jun 15, 2023 10:44:15 GMT -5
Please send a picture of the display to support@lakeshore.com so we can review what you are seeing.
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Post by Lake Shore Jeff M on Jun 7, 2023 7:42:04 GMT -5
The issue may be in the line: “ z = (((x - ZL) * (ZU - x)) / (ZU - ZL))” This should read: “ z = (((x - ZL) - (ZU - x)) / (ZU - ZL))
Please le me know if this does not resolve the issue
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Post by Lake Shore Jeff M on Jun 2, 2023 11:54:30 GMT -5
Providing you have a P value that is greater than 1 and your setpoint is higher than the control sensor temperature, if you have no output, there is most likely a defective component in the heater circuit and there nothing you can do other than purchase a new controller as we no longer offer repair service for the Model 330.
I suggest you reset the controller to factory default values, then reconfigure the controller and if it still does not work, there is nothing you can do other than replace the controller.
To reset the controller, press and hold the Escape and Units buttons in for approximately 20 seconds and when all of the LED's light release the buttons.
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Post by Lake Shore Jeff M on May 30, 2023 6:35:23 GMT -5
Chart recorder can only connect to one controller, however, you can run multiple chart recorder applications in separate windows at the same time. Start the application and connect to the first Model 336, then start another window with the application connected to the second Model 336.
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Post by Lake Shore Jeff M on May 22, 2023 11:57:07 GMT -5
We have found that the main issue is that The Chart Recorder application is a 32-bit JAVA application so it requires that a 32-bit JAVA version be installed. Based on the failure mode, I believe you only have a 64-bit JAVA version installed.
To confirm, open the JAVA Configurator and click on Java and then view. You need to see both the X86_64 and X86 versions.
If you do not have the X86 version installed it can be obtained from the Oracle web site.
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