Measurement operation

If the measurement is not complete immediately after sending the INIT command or immediately after a MEAS query, the response data to an FETC/READ/MEAS query is generated after the measurement is complete.

- FETCh subsystem Tutorial

FETC? queries the measured data without starting the measurement operation.

If FETC? is sent without making a measurement in advance, a SCPI error (-230,"Data corrupt or stale") occurs, because there is no valid measured data. Be sure to use this command with the INIT command.

Because this command queries the value when the measurement operation was carried out, the response value may be different from the value displayed on the panel.

- READ subsystem Tutorial

Queries the measured data after starting a new measurement operation.

READ? is equivalent to combining the INIT command and FETC? query.

- MEASure subsystem Tutorial

MEAS resets the settings to default, starts a new measurement operation, and acquires the resultant data.

MEAS? is equivalent to combining the ABOR, FUNC, CONF command and FETC? query.

meter_fn

There are three types of measurement functions on the KFM2005/KFM2030: impedance measurement, voltage measurement, and current measurement.

This manual expresses the third level node of FETC?, READ?, and MEAS? as <meter_fn>. Refer to Table and replace <meter_fn> with the required measurement function.

 

Sequence <meter_fn> Measurement Funcion Response Unit
1 IMPedance[:MAGNitude] Impedance (magnitude) measurement OHM
IMPedance:RESistance Impedance (resistance) measurement OHM
IMPedance:REACtance Impedance (reactance) measurement/td> OHM
IMPedance:PHASe Phase angle measurement DEG
2 VOLTage[:DC] Voltage measurement V
CURRent[:DC] Current measurement A

The data type is the type specified by the previous FETC?, READ?, MEAS:<meter_fn>?, or CONF command. For example, if the CONF:IMP command was used before this command, FETC? is equivalent to FETC:IMP?.

Difference between SCALar and ARRay

The second level node of FETC?, READ?, and MEAS? can be [SCALar] or ARRay. [SCALar] is the default node that can be omitted. It returns a single value regardless of the trigger count designation. If ARRay is specified, multiple points of measured data separated by commas are returned according to the trigger count designation. Table indicates the contents of the response in [SCALar]/ARRay for the trigger count designation.

Trigger Count

Node

Response
1

[SCALar]

A single measured value
9.9E37 if over range
-9.9E37 if under range/p>

ARRay

A single measured value
9.9E37 if over range
-9.9E37 if under range

2 or greater

[SCALar]

Average of all measured data points (excluding over range and under range data)
9.9E37 if all data points are over range
-9.9E37 if all data points are under range

ARRay

Array of all measured data points separated by commas