Coherent FieldMaxII-TOP Manual do Utilizador descarregar pdf (Página 71)

Special Topics

The first pulse is used to trigger the calculation and is

discarded because its time interval, t

, is indetermi-

nate.

When n = 0, power is zero. This situation occurs when

only one pulse is received in a display period (for

example, interval B in Figure 19). To offset this limita-

tion, a laser pulse rate of at least 6 Hz is required for burst

power measurements.

Another limitation occurs on multiple bursts (interval C

in Figure 19). If there are two or more bursts in any

display interval, the gap between bursts will appear as

lower power and the display will be affected accordingly.

Negative

Power Display

A negative power reading indicates the sensor needs to

be zeroed. Two areas of the display are affected by a

negative power reading: the digital tuning feature and the

numeric measurement display.

Figure 19. Burst Power Limitations

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Coherent FieldMaxII-TOP Manual do Utilizador Página 71