GE IS200ERSCG2A Relay output module

Since dBm is a logarithmic measurement, the ratio between two measurements will be the difference between the dBm measurements. For instance, if you want to measure the loss in a fiber optic cable where the measurement before the cable is 1mW = 0dBm and the measurement after the cable is 0.1mW = -10dBm. The ratio is then 1:10 = 0.1 and the dB loss is 0 – (-10) = 10dB.

The dB offset function allows you to easily measure this. 

To do so do as follows: 1. When measuring the reference value press “dBO”. The value changes to 0 dB (note that now the units are dB, a relative value instead of dBm, an absolute value). 2. Now make your second measurement and the value of the difference in dB = ratio in numerical units will be shown.

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