Agilent Technologies 4294A Specifications download pdf (Page 107)

Take caution of electrical shock hazards when using the external DC bias circuit.

A large energy is charged in L1 and L2 as well as the DUT (Lx) by a bias current delivered from an

external power supply and, when the DUT is disconnected from the measurement circuit, the DUT

generates a very high spike voltage (kick-back voltage) to discharge the energy. To ensure operator

safety, decrease the bias current to zero before disconnecting the DUT.

L1 and L2 discharge through the protection circuit the instant the DUT is disconnected from the

measurement circuit or the bias current is turned off. To prevent the instrument from being dam-

aged by harmful discharge, the protection circuit must be designed carefully for the withstanding

voltage/current rating of each circuit component. Refer to Application Note 346 “A Guideline for

Designing External DC Bias Circuit” for more information.

Figure 5-43. External current bias protection circuit

5-33

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 125 126

No comments

Agilent Technologies 4294A Specifications Page 107