Tutorial > Measurement Using a Single Measurement Function > Multipoint measurement with specified trigger count

The simplest measurement procedure | Measurement procedure with a little more flexibility
The most flexible measurement procedure | Multipoint measurement with specified trigger count
Measurement using software triggers

Measurement Using a Single Measurement Function

Multipoint measurement with specified trigger count

The KFM2005/KFM2030 allows up to 16 measurement operations to be carried out with a single start action (READ? or INIT). The number of measurements is specified by the trigger count.

Once the measurement is started with the READ[:<meter_fn>]? query or the INIT command, the KFM2005 continuously measures the number of times specified in advance by the trigger count. When all measurements are complete, the measured data can be retrieved.

The trigger count, as the name implies, is the number of triggers. However, if the trigger source is set to IMMediate (default), the specified number of measurements proceeds automatically after the READ? or INIT command. If the trigger source is set to BUS, software triggers (*TRG command or the IEEE488.1 get message) must be sent the specified number of trigger counts after the INIT command. If the trigger source is set to TIMer, measurement is performed at the time interval specified by the TRIG:TIM command. The specified time is in units of seconds [s], and the maximum value is 60 s.

 

The MEAS:<meter_fn>? query and the CONF:<meter_fn> command force the trigger count to 1, the trigger timer to 0 s, and the trigger source to IMM. Therefore, the MEAS:<meter_fn>? query cannot be used to make multipoint measurements. In addition, the trigger must be set after the CONF:<meter_fn> command.

Example:

CONF:IMP  
TRIG:SEQ1:COUN 4  
TRIG:SEQ1:TIM 1.0
TRIG:SEQ1:SOUR TIM
INIT:SEQ1;*OPC?
(Read the response)
FETC:IMP? 'Query the impedance data (absolute value) that has been measured.
(Read the response)
FETC:IMP:RES?;REAC?;PHAS? 'Query the resistance, reactance, and phase data.
(Read the response)

 

When all the measurements specified by the trigger count are complete, the response (ASCII character 1) to the *OPC? query can be retrieved. Then, the data can be retrieved using the FETC[:<meter_fn>]? query, etc. The response in this case is the result obtained by averaging all the specified number of counts of data.

A node [SCALar] is hidden in the MEAS, READ, and FETC queries. [SCAL] is a default presentation designation that can be omitted. It returns a single value regardless of the trigger count designation. Another presentation that can be specified is ARRay. In this case, multiple points of measured data separated by commas are returned according to the trigger count designation.

Response of multiple points measurement (SCALar and ARRay)