Coherent FieldMaxII-TOP Manuel d'utilisateur télécharger pdf (Page 62)

FieldMaxII-TOP User Manual

Pyroelectric-

Specific

Information

Information in this section pertains exclusively to pyro-

electric sensors. If you are using a thermopile or optical

sensor, refer to “Thermopile- and Optical-Specific Infor-

mation” on page 50.

Internal

Triggering

Mode

For greatest accuracy and repeatability, FieldMaxII-TOP

must trigger reliably for each laser pulse. Internal trig-

gering refers to extracting an artificial trigger from the

incoming signal.

To successfully extract an internally-generated trigger,

set the meter range so that the incoming signal is at least

5% of the full scale. Set the trigger level at least 2%

above the noise level and at least 2% below the peak

height.

For example, with a peak height of 300 mJ, set the meter

to a range of 3 J. A peak will occur at 10% of full scale,

well above the 5% level. The trigger level should not be

set higher than 8%. If the noise level is 5% of full scale

(approximately 150 mJ), the trigger level should not be

set lower than 7%.

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Coherent FieldMaxII-TOP Manuel d'utilisateur Page 62