ANNEX
LSM
510
DuoScan
Carl Zeiss
Monitor Diode
LSM 510 META
DuoScan
8-22
B 45-0021 e
03/06
The single steps to find the right setting of all the parameters to be set are listed in the following:
•
Activate the Range Indicator.
•
Adjustment of
Amplifier Offset
: the Offset of the PMT channel and diode channel have to fit to each
other to guarantee the best noise reduction.
The best way to do the adjustment is the following:
•
Choose different colors in the
Configuration Control
window for PMT and diode channel.
•
Activate
Line Scan
.
•
Switch off all laser lines in the
Excitation
window.
•
Activate
Cont.
•
Set values for
Ampl. Gain
to 1 in each channel.
•
Set the lines visible to the same level as close to the ground level as possible; the values you find for
the Offset in each channel should be negative.
A final adjustment of the offset adjustment is done by visually evaluating the noise reduction in the ratio
image. As the Offset value of the PMT channel influences the range setting of the ratio image much less
than the Offset value of the diode channel, the fine tuning should be done via the PMT offset, if
required.
As mentioned before, the calculation of the ratio image is very sensitive to different signal
offsets in the two channels used. As the offset is influenced by the scan speed as well as by the
Amplifier Gain used, the offset calibration is not valid any more if the scan speed is changed, or
the Ampl. Gain is set to a new value respectively. In most cases a new fine tuning is necessary. If
this doesn’t work, the complete calibration process has to be repeated.
Another possibility to calibrate the offset values is to set the values to -0.1 as default for both channels,
then perform steps 3 and 4 and finally adjust the noise reduction by varying the PMT offset value.
If the ratio application is used and the offset has been set to the best reduction of noise in the ratio
image, it is not allowed to change the offset of the PMT channel to change the reduction of background
fluorescence, for example. This can be done only if the diode offset is corrected afterwards.
Adjustment of Detector Gain
The Gain of the PMT should be set with the help of the range indicator function. No ‘red ’ and no ‘blue’
pixels should occur in the image of the PMT.
Содержание LSM 510
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Страница 442: ...Programming for LSM LSM 510 DuoScan Carl Zeiss Events LSM 510 META DuoScan 5 18 B 45 0021 e 03 06...
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