| 摘要 |
A circuit for controlling signals between a signal source at a first terminal, a device under test at a second terminal and a metering means at a third terminal where the device under test may be either a source of signals or a load, provides signals at the first terminal to the second terminal and to the third terminal in one condition and in a second condition provides signals from the second terminal to the third terminal and isolates the first terminal from signals at the second terminal.
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