Tutorial > Measurement using the concurrent measurement function > Multipoint measurement with specified trigger count
Measurement using the concurrent measurement function
Multipoint measurement with specified trigger count
Even when multiple <meter_fn>s are selected simultaneously, different trigger settings can be assigned to every sequence 1 and sequence 2 group.
The former is the sequence group dedicated to the impedance measurement, and the latter is the sequence group dedicated to the voltage and current measurements. Because these two measurement sequences operate asynchronously, the measurement start, trigger handling, and measurement end are respectively independent. Though it depends on the measurement conditions, impedance measurement usually takes longer than voltage and current measurements. Therefore, it is possible to make numerous voltage and current measurements while making one impedance measurement.
In the next example, the impedance measurement is made twice, and the voltage and current measurements are made four times. The measurements are started simultaneously.
FUNC:ALL | ||
CONF:IMP;VOLT;CURR | ||
TRIG:SEQ1:COUN 2;SOUR IMM | ||
TRIG:SEQ2:COUN 4;SOUR TIM;TIM 1.0 | ||
INIT;*OPC? | ||
FETC:IMP:MAGN?;RES?;REAC?;PHAS? | 'Query the impedance data. | |
(Read the response) | ||
FETC:VOLT? | 'Query the voltage data. | (Read the response) |
FETC:CURR? | 'Query the current data. | (Read the response) |
Note that the TRIG commands explicitly specify the sequence number. TRIG:SEQ1 corresponds to the trigger settings of the impedance measurement function (sequence 1 group), and TRIG:SEQ2 corresponds to the trigger settings of the voltage and current measurement functions (sequence 2 group). In the example above, the measurement start action is specified by INIT[:IMM][:ALL]. However, a sequence number can also be specified explicitly for the INIT command to start the measurements independently at the group level.
Example:
INIT:SEQ1 | 'Start the impedance measurement. | |
INIT:SEQ2 | 'Start the voltage and current measurements. |
A sequence number cannot be specified for the ABOR command. The ABOR command aborts the measurements of both sequence groups simultaneously.