Post by Lake Shore Jeff M on Oct 18, 2018 7:15:00 GMT -5
I have discussed your question with my applications engineer and due to the complexity of your question, answering it in the forum will be very difficult, therefore, they have asked me to obtain your email address so please send this request to email@example.com and I will have our applications engineer contact you directly. Please be sure to include your contact information including your full name, company, address and contact telephone number.
Post by Lake Shore Jeff M on Oct 11, 2018 12:24:34 GMT -5
I checked with our design engineer and he informed me that when you power on the Model 475 with the hall sensor connected directly it will display an Invalid Probe error. If you press enter, it will bring you to a screen to enter the nominal sensitivity and the Gaussmeter will then display a field and not resistance. You will need to enter the sensitivity every time you power cycle the Gaussmeter. If you press enter without entering the sensitivity, it will display in resistance.
He also confirmed that this does work in all measurement modes, DC, AC and RMS
Post by Lake Shore Jeff M on Oct 11, 2018 9:11:03 GMT -5
It is possible to connect the hall sensor directly to the Model 475 input without using a HMCBL cable, however, the Model 475 Gaussmeter will revert to a resistance measurement requiring you to manually calculate the voltage and then interpolate the field from the calibration data you have.
If you do use the HMCBL cable, you can enter the single point nominal sensitivity value provided with the calibration data you received and the Gaussmeter will calculate and display the calculated field value.
Finally, there is no way to enter the full calibration data table for the HGCA sensor into the Gaussmeter. To use the complete calibration data supplied with the sensor requires you to manually calculate the field between the data points using a separate current source and volt meter or calculating the voltage from the resistance read by the Gaussmeter without a HMCBL cable
Post by Lake Shore Jeff M on Oct 10, 2018 6:50:04 GMT -5
Although I am not familiar with the Prologix USB adapter you are using, I can tell you that the GPIB Interface on the Model 331 is designed to work with GPIB Devices that support the National Instruments IEEE-488.2-1987 specification. We have seen other adapters that do not fully support this specification not work with our equipment and when replacing the adapter with a National Instruments adapter everything functions as it is designed.
Looking at the Prologix information, I see it can be used with either drivers that create a virtual serial COM Port or with a true GPIB DLL driver. Based on the serial port information you provided I assume you have loaded the RS232 version of the driver and I also assume your Python script is written to open and close the COM port accordingly.
One thing I did see in the Proligix information was that special handling of the Carriage Return (CR) and Line Feed (LF), \r\n, characters is required as the driver uses that for its operation. According to the documentation, when the CR and LF are included in the string you are sending it needs to be "Escaped" so that the GPIB Adapter does not use it for message flow control. Did you account for this in your application as this could explain the partial string you are seeing after power cycling the 331?
Post by Lake Shore Jeff M on Aug 13, 2018 7:09:14 GMT -5
PROFIBUS has a standard way of terminating the bus, therefore, you should follow the PROFIBUS standard.
Please review section 3.4.7 in the user manual that makes a recommendation to a Phoenix module that we have used which seems to work nicely.
“Several options are available for PROFIBUS-specific terminating resistors. Lake Shore has successfully tested the module with several different termination methods. Phoenix’s PSI-Terminator-PB-TBUS may be a convenient way to connect the power and PROFIBUS cabling to meet the applicable PROFIBUS requirements, especially when the modules are first or last on the PROFIBUS segment.”
Post by Lake Shore Jeff M on Aug 10, 2018 8:52:53 GMT -5
The analog output will provide a voltage representing the temperature displayed on the input that is assigned to the analog output. This output could be connected to a PLC like device that is also controlled by your Labview application. I suggest you check with National Instruments to see if they have a recommended device to use.
Post by Lake Shore Jeff M on Aug 10, 2018 6:51:49 GMT -5
If you are using the Model 335 to control the temperature, and want to use the reading from a different sensor for the control, there is no way you can do that in the Model 335 controller unless you can connect that sensor to the second Input on the controller. If the sensor cannot be directly connected to the controller, the only thing you could do is to do all of the PID Calculations in Labview and then manually set the heater output via Interface commands from your Labview program.
Post by Lake Shore Jeff M on Aug 7, 2018 11:20:38 GMT -5
Yes, any of our platinum sensors can be installed in the temperature probes we offer. If you plan to make your own probe, you would need to ensure that the sensor is fixed in place and makes good thermal contact with the probe body.
You can find more information on the temperature probes we offer at:
If you are not sure how to do this is Labview, you can contact National Instruments for programming assistance or another option may be to look at how the Lake Shore Instrument Communications Utility (ICU)(found here: www.lakeshore.com/products/pages/icu.aspx) handles this as it properly closes the socket before closing the application. You could use a program like Wire Shark to monitor the connection and compare the close operation between your program and out ICU application
Post by Lake Shore Jeff M on Aug 1, 2018 9:06:51 GMT -5
Actually, I have done additional research and most likely you have a firmware version that does not handle the exponent properly. Please send a *IDN? command to the Model 625 and see if the reported firmware version is version 1.3 or earlier. If it is, please send an email to firstname.lastname@example.org and provide your contact information and shipping address as we can send you a new Firmware EPROM that should eliminate the issue.
Post by Lake Shore Jeff M on Jul 19, 2018 6:44:23 GMT -5
You are correct, the gold plated leads are attached to the bonding pads using 60/40 SnPb solder. The Gold plated copper leads do not have any solder on them. When attaching lead extensions to the sensor, you will need to prepare the connecting wire ends with a RMA (rosin mildly active) soldering flux, tin them with a minimal amount of 60/40 SnPb solder. Use a low wattage soldering iron which will not exceed 200 °C.
Post by Lake Shore Jeff M on Jul 3, 2018 11:39:33 GMT -5
Based on this test, you will need to return the Gaussmeter and probe so we can determine which is bad. Most likely it is the probe, however, the only way to know for sure is to purchase a new probe or return both so we can perform an analysis.
Please contact email@example.com with your information so we can issue a RMA.
Post by Lake Shore Jeff M on Jul 3, 2018 7:12:40 GMT -5
The issue you are reporting can be due to a defective probe or an internal issue in the Model 450 Gaussmeter.
The first thing I suggest you do is measure the resistance between pins 1 & 9 and pins 8 & 15 on the probe connector. You should see a reading of approximately 2.7 Ohms and if you see more than 4 ohms, the probe is defective and you will need to order a new probe.
If you see the correct reading, then the probe and Model 450 will need to be returned to the factory for analysis. If this is the case, please contact firstname.lastname@example.org and provide them with your contact information as well as the model and serial number of the probe and the serial number of the Model 450.