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What is the difference of our DC power supply

Today,Mr. Gao, ur product manager show the difference of DC power supply to sales.
He explain and show the product usage seriously:

1. T / S / DE series is special for mobile phone, can test the phone signal(like GSM, CDMA), also can supply and test the voltage/current/.

2. A series just supply the power.
3. DD series can limit the current, this function is also as a test function. The most different from other suppliers is that can adjust the current firstly when output.  Other suppliers must be in the case of power or short circuit then adjust the current. The voltage can be fixed to the output.

4. D+ series is an upgraded version of DD, in addition to all the functions of DD can also test the phone signal.