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BSA Flow Software Installation and User's Guide - CSI

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8.3 PDA<br />

8.3.1 Calibration (PDA only)<br />

No signal from the Photomultiplier Tube<br />

High voltage too high or to low.<br />

High Voltage or<br />

An automatic calibration is carried out either the b<strong>and</strong>width, the center<br />

frequency, the gain or one of the photomultiplier high voltage is changed<br />

(chapter 4.7.2.3).<br />

During this operation different warning message might come up. They are<br />

explained in the following chapter.<br />

The following error message (Figure 8-2) will come up if one of the cables<br />

is disconnected or defective <strong>and</strong>/or if the gain is too low.<br />

• Check the cables connections according to the description (chapter<br />

4.7.1.1).<br />

• Increase the gain (LDA 1 properties)<br />

Figure 8-2: Calibration. No signal from the Photomultiplier tubes.<br />

If you get the following messages (Figure 8-3, Figure 8-4, Figure 8-5), you<br />

need to adjust the gain <strong>and</strong>/or some of the Photomultipliers High Voltages.<br />

The displaid values in the warning window are the level ratio between each<br />

PM <strong>and</strong> the maximum calibration level allowed for the calibration. These<br />

figures should not be higher than 1.<br />

Gain too high. In the case of Figure 8-3, Photomultiplier 1 level is above the Maximum<br />

calibration level required for the calibration. Reducing the gain <strong>and</strong>/or<br />

reducing the high voltage of channel 1 will solve the problem<br />

<strong>BSA</strong> <strong>Flow</strong> <strong>Software</strong>: Trouble shooting 8-5

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