Features & Description
EPM2000/EPM2000e Reference Guide
7
Triggering
Typical instrumentation triggers the EPM2000 reliably. If the triggering instrument cannot source
enough current, boost the current supply externally using a trigger circuit such as shown in Figure 5.
Figure 5: Method to boost source current of triggering device.
UNDERSTANDING THE EPM2000 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 EPM2000 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.
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 EPM2000 determines 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 EPM2000 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
EPM2000's raw accuracy otherwise.
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