R&S ESU Series Operating Manual page 404

R&S ESU
Fig. 4.38 Test with single trigger pulse
A particularly difficult aspect of this problem is the variable settling times, which are
unavoidable in practice. If there is no signal to indicate that the R&S ESU is ready to
collect measured data, the maximum settling time will have to be allowed for until
the trigger signal is sent, thus ensuring reliable measurements. This results in con-
siderable – and in many cases unacceptable – time overhead, depending on the
instrument settings.
To minimize this overhead, the port supplies a signal that indicates the R&S ESU's
readiness to collect measured data. The signal is reset on detection of the next trig-
ger signal. In this way, a handshake is established between the R&S ESU and the
DUT and between the R&S ESU and the controller, which ensures reliable measure-
ments and reduces the time overhead to the settling time actually needed by the
R&S ESU:
Fig. 4.39 Test with ready-for-trigger signal
Operating Manual 1302.6163.12 - 03
Analyzer Setup
Analyzer Settling Time
Analyzer not ready for trigger
Start
Measurement
Analyzer Setup
Analyzer Settling Time
Start
Measurement
DUT Output Signal
valid Trigger
Signal
DUT Output Signal
Data Acquisition
ready for
Trigger
Trigger
Signal
Instrument Functions
User Port
Data Acquisition
4.373