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September 2018

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Subject:
Re: Spectrometer counting anomaly after wire/belt replacement
From:
Ron Rasch <[log in to unmask]>
Reply To:
JEOL-Focused Probe Users List <[log in to unmask]>
Date:
Mon, 3 Sep 2018 23:49:22 +0000
Content-Type:
text/plain
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While there, also make sure the belt join is in the correct place and not being traveled on by the small wheels. 



On 04/09/2018, at 9:46 AM, "Ron Rasch" <[log in to unmask]> wrote:

> Hi Deon,
> 
> I had similar once. I vented the system, opened the spectrometer and watched as I moved the system through it's paces, using direct spectrometer control. 
> 
> I found that the HV cable to the detector rubbed and slightly moved the detector. Depending on peak-search, direction of travel, etc it moved the detector differently. 
> 
> I just pulled the HV cable back a few mm, pumped down, and all was fixed. 
> 
> Good Luck !
> 
> Ron
> 
> 
> 
> On 03/09/2018, at 9:41 PM, "Deon van Niekerk" <[log in to unmask]> wrote:
> 
>> Hi All,
>> 
>> I had the belt and wire replaced on SPEC1 (FCS, flow) and the LDEs optimized, on an 8230 (tungsten cathode).
>> 
>> After this the counts collected during calibration (Si, Al, Ti so far) is lower than the counts collected as unknowns on the same calibration standards(!!) (by several hundred), with the result that the unknowns analyzed on TAP1 and PET1 are several wt% too high. This has been going on systematically for a week now.
>> 
>> As far as I can tell, the gain, HV, acc potential, current, peak/background times, and peak-background locations are the same between the calibration- and unknown- setups.
>> 
>> Any ideas please?!
>> 
>> Thanks,
>> Deon.
>> 
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