Generally, the higher the temperature of the optical fiber tester, the greater the light source power value it emits. During the test, the optical fiber tester needs a period of preheating to stabilize the transmitted light source power value. If the reference value is set before the light source module is warmed up, as the temperature of the light source module rises, the test result will have a gain, thereby affecting the accuracy of the test result.
For example, when the reference value is initially set, the power value accepted and stored by the optical fiber tester is -6.00dB. At this time, if the reference value setting model is maintained and the test is performed without adding the link under test, you should get 0.00dB test results. However, after the preheating of the optical power module, the emitted power will increase, and the power value received by the optical fiber tester may rise to -6.20dB. At this time, the test will get a gain of -0.2dB.
The preheating time of the light source module is related to the temperature of the test environment. The method to check whether the light source module is stable is very simple, as long as the reference value setting is completed, the reference value model is tested, and the obtained test value is acceptable from -0.04dB to 0.04dB; if this is exceeded Value, you need to wait for a while and reset the reference value.