Features & Description
EPM1000 User’s Guide
11
Understanding the
EPM1000 Speedup
Feature
For most applications, it's important to determine laser power quickly
and accurately. However, some probes, such as the PM5K, which can
measure power as high as 7500 Watts, have a long response time. The
EPM1000 solves this problem by using probe information and an
internal algorithm, called the Speedup feature, to quickly estimate the
final power value.
For long response time probes, the Speedup feature significantly reduces
the amount of time required for an estimated value.
5 W
10 W
15 W
Measured
Power
Probe Output
5 s
10 s
Speedup Reading
Figure 5: The Speedup feature estimating a 15 W power reading
While the Speedup feature is useful for a stable laser output, it is not
well suited for constantly changing or unstable laser outputs, as it tends
to amplify noise. The most accurate way to measure power, particularly
for unstable laser outputs, is to deactivate the Speedup feature.
The fastest and most accurate results can be achieved when the Speedup
feature is in Selective mode. In Selective mode, the EPM1000 deter-
mines when the Speedup algorithm should be used. Whenever the actual
measurement and the estimated measurement differ by more than 5%, the
Speedup data will be displayed, but when the actual measurement falls
within 1% of the estimated measurement, the EPM1000 displays the
actual measurement. For most probes, using the Selective mode is very
effective, taking advantage of the Speedup feature when needed and
relying on the EPM1000's raw accuracy otherwise.
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