Agilent Technologies E5070B, Руководство пользователя

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Appendix F 739
Replacing the 8753ES with the E5070B/E5071B
Important Functional Differences
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Trigger System
The trigger system detects the signal for starting a measurement (trigger) and controls
decisions on whether to measure or not measure.
On the 8753ES, the trigger state is available for the pair of a main channel and an auxiliary
channel (two pairs: channels 1 and 3 and channels 2 and 4). For each pair, three states are
available: Hold, Waiting for Trigger, and Measurement. When a trigger event occurs, one
pair of channels in the Waiting for Trigger state are put into a sweep operation. If the other
pair is also Waiting for Trigger, then the next trigger event puts it into sweep operation as
well. When the sweep condition coupling channels is turned on, the Hold, Waiting for
Trigger, and Measurement states are common to all channels. In this case, when a trigger
event occurs in the Waiting for Trigger state, all channels are put into sweep operation. For
example, when you set channel 1 and 2 to uncouple and sweep each channel, you need to
set each channel to Hold state and make trigger events to each channel.
On the E5070B/E5071B, the trigger system involves states of the entire system and those
of each of the channels. Since a trigger event is common to all channels, three system-wide
states exist: Hold, Waiting for Trigger, and Measurement. On the other hand, two states
exist for each channel: Idle and Startup. For a channel in an Idle state, measurement is not
performed at all, while for a channel in Startup state, measurements are started in sequence
after an event occurs. When all channels are in an Idle state, the E5070B/E5071B is in
Hold state when viewed as an entire system. If even one Startup state channel exists, the
E5070B/E5071B enters the Waiting for Trigger or Measurement state. Upon a transition
from the Waiting for Trigger to the Measurement state, measurement is performed on
channels put into Startup state starting with the channel with the smallest channel number.
While the 8753ES allows either High or Low input signals from the external trigger line to
be selected, the E5070B/E5071B allows only Low input signals to be selected.