Dear all,
Our 700 MHz AVIII spectrometer with a CPI- cryoprobe recently had a fluctuating
Preamp Heat and Preamp Dev values : After CP10-k replaced the cold head, the
preamp temperature now reads ~71 K, which is much lower than the 77 K setpoint.
Particularly, both Preamp Heat and Preamp Dev values are unstable and keep
fluctuating. We have tried many ways but could not resolve the issue.
Has anyone encountered a similar situation before? Your tips are appreciated.
Best regards,
BHC
******************************
Banghao Chen
NMR Facility Director
Distinguished University Scholar
Florida State University
Department of Chemistry and Biochemistry
102 Varsity Way, Tallahassee, FL 32306
chen_at_chem.fsu.edu<mailto:chen_at_chem.fsu.edu>
o: (850) 644-3334
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#3041): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/3041__;!!PvDODwlR4mBZyAb0!SfnIm_RsQnpTt0stfrHBWh4fmNLNwK=
D0-XLMzKvojL5AlBtQePnLxjMqzfu_qubIAlB0cp3Nz8qH4ILf3pe2sV8K_pjk$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/116730639=
/7559972__;!!PvDODwlR4mBZyAb0!SfnIm_RsQnpTt0stfrHBWh4fmNLNwKD0-XLMzKvojL5Al=
BtQePnLxjMqzfu_qubIAlB0cp3Nz8qH4ILf3pe2se_xcJLQ$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
Received on Thu Dec 11 2025 - 07:35:24 MST