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HP E1433A User's Guide
The
Measurement Process
Measurement Setup and Control
When the HP E1433A makes a measurement, the measurement itself consists of two phases: the measurement initialization, and the measurement loop. Each of these phases consists of several states, through which the measurement progresses.
The transition from one state to the next is tied to a transition in the Sync/Trigger line (one of the TTL trigger lines on the VXI back plane). A state (such as Idle) begins when the Sync/Trigger line goes low. The Sync/Trigger line then remains low as long as the state is in effect. When the Sync/Trigger line goes high it signals the transition to the next state. See the sections “Measurement Initialization” and “Measurement Loop” below for more details about these transitions. During all the transitions of the Sync/Trigger line, the clock line continues with a constant pulse.
The Sync/Trigger line is
Sync/Trigger line |
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| Idle | Trigger |
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| Arm |
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| Meas |
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| Start of | End of |
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| state | state |
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