Plotting anomaly using Clarity 2.6.3.313 and 2.6.3.320

[paolo551]

Good morning, Sirs

I use Clarity to acquire signals from my DANI MASTER GCs through the USB
link.
I first noticed the anomaly while running both vers.2.6.3.320 and vers.
2.6.3.313.
The anomaly shows itself frequently, on several systems (GC linked to a
PC), usually after a refresh of the "Data Acquisition" window (for example
after an "Unzoom"). The anomaly seems to show itsels only during a Plot and
not during a Run.

Look at the picture in the enclosed file. That’s what happens when the
anomaly shows itself.
I was acquiring signals via USB link from three detectors at a sampling rate
of 300Hz per channel. From time 4.3min on you can see baselines from
detectors 2 and 3 with their own drift and noise. After an "Unzoom",
baselines before time 4.3min were replaced with flat lines. Baselines from
time 4.3min to 7.3 were copied and pasted back from time 0.8min and filled
with colour. The same happened to detector 1’s baseline.

On another instrument I aquired the same signal through both the USB link at
300Hz and the INT7 interface at 100Hz with the same result.

I remember that on versions before 2.6.3.313, during a Plot, after an
"Unzoom" you could see the earlier part of the baseline replaced with a flat
line, but I never saw the copying of a part of the chromatogram.

Have you got any suggestions?

Best regards
Paolo Ventura

[Ivan Vins]

Dear Paolo,

we have not observed or got reported this problem with other detectors. Please, could you check if it is related to Clarity version or to the version of your control module for Master GC? No changes were made in the dataacquistion window display in Clarity recently (in the mentioned versions).

Best regards

Ivan Vins
DataApex, Ltd.
Podohradska 1
153 00 Praha 5
Czech Republic

Phone: +420 251 013 404, +420 251 013 400
Fax: +420 251 013 401

www.dataapex.com

[FMMeier]

Dear Ivan,

this seems to be the same problem we encountered with our software. Maybe
the problem is between certain windows (updates) and the U-PAD driver.

Best regards,

Frank Meier
SYKAM GmbH

[rembert]

Dear Paolo,

you write that you are using DANI Master GC with USB. Why do you use this slow connection? Try to use the LAN connection which is possible even with several GCs. It is much faster and data transfer safer, probably, at these high acquisition rates. Eventually this could solve your problems.

Kind regards

Rembert Forche
***************************************
Dr. R. Forche Chromatographie
Fritz-Peters-Str. 40
D-47447 Moers GERMANIA
Tel. xx49 2841/39 53 83
Fax xx49 2841/39 53 78
www.gchplc.de
info@gchplc.de
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[Ivan Vins]

Dear Frank,

the problem described by Paolo is completely different - yours was appearing only during acquisition and for unknown reason the data acquisition by U-PAD was stopped prematurely. This problem is related to the display of data in acquisition window outside run - most probably caused by some problem in the DANI GC Master control module.

Best regards

Ivan Vins
DataApex