Tegam’s ± 40 V DC bias adapter model 2191A block diagram

The 2191A’s has an internal DC blocking capacitor. When a DC bias voltage is applied, this DC blocking capacitor will charge to nearly the same voltage. If the test leads or test adapter connections are shorted, the stored energy within this DC blocking capacitor can source currents through protection and measurement circuits of the LCR meter, with little current limitation. However, using the internal current limiting feature designed into the EXT DC BIAS connection, the stored energy can be safely discharged. One of the procedures described below is required to protect the measurement system. Likewise, either procedure must be followed for each and any new device under test (DUT). That is, if a new DUT is to be measured, discharge the 2191A.

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