[3dem] FEI-VPP phase change to opposite direction

jamon jamonshi at gmail.com
Wed Jan 25 21:52:54 PST 2017

Dear Matthias,

The heater is on. I played with the current up/down, which only affects 
the phase change rate, but not the direction.

Dear Jaap,

I agree with you. It could be charging issue. After installing VPP on 
Krios, we can't reach 70um aperture anymore, which is out of travel range.

Unfortunately, our JEOL Holefree phase plate got jammed badly recently, 
I can't do a cross check.

Best Regards,


On 01/26/2017 01:41 PM, Matthias Wolf wrote:
> Hi Jian,
> Is the heater on?
> The power supply should show "CC".
>    Matthias
>> On Jan 26, 2017, at 14:12, jamon <jamonshi at gmail.com> wrote:
>> Dear Lister,
>> We just changed our FEI Volta Phase Plate on Krios. But after activation, the phase changed to opposite direction, the FFT rings moves outward instead of inwards as it should be. The gold particles all looks all white as if in overfocus. I had never seen such behavior with previous two VPPs we had. Did anybody have similar experience? Thanks in advance.
>> -- 
>> Best Regards,
>> Jian SHI
>> Manager, Cryo Electron Microscopy Facility
>> Center for BioImaging Science
>> National University of Singapore
>> _______________________________________________
>> 3dem mailing list
>> 3dem at ncmir.ucsd.edu
>> https://mail.ncmir.ucsd.edu/mailman/listinfo/3dem

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