Many modern measuring instruments are providdd with performance testing modes in which their metrological characteristics can be checked. The implementation of such a mode requires, as a rule, a built-in standard source of the measured quantity. The circuit diagram of a radiation source that acts as a standard in a laser radiation
1986
The emitted power is stabilized by keeping the LED temperature constant and by feeding it from a constant-current generator composed of field-effect transistor (FET) T1 (KP902A), operational amplifier M1 (140UD7), resistors R1 and R2, and zener-diode voltage stabilizer D2 (D818E). The generator output current is 80 mA, the stabilization error not exceeding
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