| 摘要 |
An ammeter for ATE instrumentation includes an amplifier, a first current measuring circuit coupled to the amplifier's power supply leads, and a second current measuring circuit coupled to the amplifier's output. The first current measuring circuit is used to select a desired current measurement range, away from the amplifier's output. Output transients caused by range changes are therefore avoided. The ammeter's response to load transients is also minimized, by providing smooth transitions between low current and high current operation.
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