Tutorial
Using Triggers
Measurement (sequence 3: ACQuire)
The PAT-T has the capability to return voltage and current measurement values. The easiest
way is use the MEASure commands. The trigger function is not used.
The MEASure commands immediately start a new measurement. Simultaneity for multi-item
measurements are lost, because each MEASure command starts a new measurement.
Advanced measurement allows separate control for measurement initiation and data query.
To measure the voltage and current, use the following queries.
The PAT-T also supports the READ command that initiates a new measurement and queries
the data. READ and MEASure are aliases; they operate exactly the same.
Advanced Measurement
The TRIGger:SEQuence3 (or TRIGger:ACQuire) subsystem allows you to control the start of
the measurement and the data query separately.
To start a new measurement, set the trigger source to IMMediate and use the INITiate
command.
:TRIGger:SEQuence3:SOURce IMMediate
'Set the trigger source to IMM
If you want the measurement of the sequence3 group to start on a software trigger, change
the trigger source to BUS.
'Set the trigger source to BUS
'Apply a software trigger to sequence 3
When the measurement is completed, measurement data can be queried with the FETCh
query commands.
The TRIGger:SEQuence3:SOURce command sets the trigger source to BUS or IMMediate.
The INITiate:SEQuence3 command makes the trigger subsystem leave the IDLE state and
go the initiated state. If the trigger source is set to IMMediate, the measurement starts
immediately. When the Trigger Source is set to BUS, the trigger subsystem goes to the WTG
(Waiting For Trigger) state. When a software trigger is applied with the TRIGger:SEQuence3
or *TRG common command, the measurement action is executed. When an ABORt or an
equivalent command is sent without executing the trigger, the measurement action is
cancelled, and then the trigger subsystem returns to the IDLE state.
The ABORt command and IEEE488.1 sdc/dcl commands simply abort the measurement task
that is in progress. It does not have a feature to invalidate any measurement data that has
been acquired. On the other hand, the *RST and *RCL common commands not only abort
the measurement task, but also invalidate the acquired measurement data. This means that
the "*RST;:FETC:VOLT?" command will generate an error, because no measurement data
can be fetched and there is no new measurement is scheduled.
The only difference between MEASure (or READ) and FETCh commands is that the MEASure
command starts a new measurement while the FETCh command does not. Availability for
measurement items is exactly the same for MEASure and FETCh.
Generating and Clearing the measurement data
The measurement data is stored in the measurement data cache for the mean value of the
moving average deviations of 64 times measured in every 4 ms. The mean value of the
moving average returns after 4 ms counted from the measurement begins upon receipt of
the "INIT:SEQ3" command. Despite the setting of the "INIT:CONT:SEQ3" whether on or off,
Overview
Setup
Overview of Messages
Command
(function search)
Protection and Clear the Alarm
Setting Changes using triggers
Command
(ABC search)
Command
(Sub-system search)
Appendix
Tutorial
PAT-T series Communication Interface Manual
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