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Current Drift in the LDC500
Rev B. Revised Oct 2012
Figure 1: LD Current Thermal drift test setup
A key specification for any laser diode driver is The test setup is shown in Figure 1. All
thermal drift, which is the relative change in laser instruments are on a lab bench exposed to ambient
current per degree Celsius change in ambient room temperature--no thermal test chamber is
temperature. Absolute stability in laser diode used.
current in turn translates to better optical
performance, including wavelength and intensity An ultrastable, precision 10 resistor was used
stability. Thermal drift in the output current is as the LDC500 laser driver's load. This resistor,
caused by such factors as internal heating of which itself was specified with a 5ppm/◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo