Tips on monitoring current for the PCO-7125.

Current Monitoring Theory We prefer to measure current going through the laser diode rather than the voltage across it. The voltage as measured across the diode is difficult to filter for the noise present in the signal. Using the installed current monitoring circuit (J2) The PCO-7125 contains a group of very low value resistors in […]

Why do I need to use a pulse generator capable of 5 volts into 50 Ω?

The benefit of using a gate input with an impedance of 50 Ohms is that a low-input impedance reduces false triggering from noise. If you’d like to convert the PCO-7125 gate input to high-impedance, you can remove R15 and R19 (100Ω resistors in parallel). However, this configuration may result in unpredictable pulse output.

What shapes the PCO-7125 output pulse?

The ideal pulse shape for many applications is a perfect square… here’s why the edges are not perfectly square: The PCO-7125 “rise time” and “fall time” specification is <17 ns typical as measured from 10% to 90% of the full waveform. That means the rise time and fall time is measured between two points on […]

Test FAQ 4

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Test FAQ 3

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Test FAQ 2

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Test FAQ 1

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Bias current and main pulse current for the PCX-7420

To minimize the laser diode’s response time to a pulse, the PCX-7420 can deliver current pulse in two steps. The first step is the bias pulse, which starts before the intended trigger time. The idea is to set the bias current just below the laser diode trigger point (the current can be set from 1 […]