I searched the web for some possible solutions and found the following information:

• According to the ACMS User’s Manual, the error message “Incorrect DC Scans Count” indicates that the number of scans requested by the user does not match the number of scans performed by the system. This could be caused by a communication error between the PC and the Model 6000 controller, or by a hardware malfunction in the ACMS coil set or the sample rod[1].
• One possible way to troubleshoot this problem is to check the connections of all cables and make sure they are secure and in good condition. You can also try to restart the MultiVu software and the Model 6000 controller, and perform a self-test on the ACMS option1.
• Another possible way to troubleshoot this problem is to use a different sample rod or a different ACMS coil set, if available, and see if the error persists. You can also try to measure a reference sample, such as Pd or Cu, and compare the results with the expected values[2].
• If none of these methods solve the problem, you may need to contact Quantum Design for technical support. They may be able to diagnose the problem remotely or send a service engineer to your location[1].

https://web.njit.edu/~tyson/PPMS_Documents/PPMS_Manual/1084-100%20C1%20ACMS%20manual.pdf

https://web.njit.edu/~tyson/PPMS_Documents/PPMS_Manual/1084-100%20C1%20ACMS%20manual.pdf

https://www.ccmr.cornell.edu/wp-content/uploads/sites/2/2015/11/PPMS-SOP-ACMS-V2-EC.pdf

My friend provides me the following answer:

The error message "Incorrect DC Scans Count. Requested = 1, Actual = 0" indicates that the PPMS is not detecting any DC signal from the sample. This could be due to a number of factors, including:

• A problem with the ACMS hardware
• A problem with the sample holder or sample
• A problem with the PPMS software

If you have checked all of these things and the problem persists, you may need to contact Quantum Design for support.

Here are some things you can try to troubleshoot the issue:

• Check the ACMS connections to make sure they are secure.
• Try a different sample holder.
• Try a different sample.
• Update the PPMS software to the latest version.
• If you have access to another PPMS system, try running the measurement on that system to see if the error persists.

If you have tried all of these things and the problem persists, please contact Quantum Design for support. They will be able to help you troubleshoot the issue and determine if your ACMS hardware needs to be repaired or replaced.

In the meantime, you may be able to work around the issue by using the AC measurement mode instead of the DC measurement mode. The AC measurement mode is less sensitive than the DC measurement mode, but it may still be able to provide useful data.

Here is a summary of the key points from both my answer and my friend's answer:

• The error message "Incorrect DC Scans Count" indicates that the number of scans requested by the user does not match the number of scans performed by the system.
• This could be caused by a communication error between the PC and the Model 6000 controller, or by a hardware malfunction in the ACMS coil set or the sample rod.
• To troubleshoot the issue, you can try the following: Check all cable connections. Restart the MultiVu software and the Model 6000 controller. Perform a self-test on the ACMS option. Use a different sample rod or a different ACMS coil set, if available. Measure a reference sample, such as Pd or Cu, and compare the results with the expected values.
• If none of these methods solve the problem, you may need to contact Quantum Design for technical support.

The website of Quantum Design for technical support is here. You can find their contact information, service notes, software downloads, warranty information, and more on their website. You can also submit a ticket or request a service call online. If you need to contact them by phone, their number is 1-800-289-6996 for the United States or Canada, or +49 6131 324 185 for Europe, Middle East, and Africa.

https://www.qdusa.com/support/customer_service.html

In addition to the above, I would also recommend that you check the PPMS software version and make sure that it is up to date. You can download the latest software from the Quantum Design website.

Good luck