Section 13: LPT library function reference Model 4200A-SCS Parameter Analyzer Reference Manual13-78 4200A-901-01 Rev. C / February 2017measXThis command allows the measurement of voltage, current, or time.Usageint meast(int instr_id, double *result);int measi(int instr_id, double *result);int measv(int instr_id, double *result);instr_id The instrument identification coderesult The variable assigned to the result of the measurementDetailsFor a measurement conversion, the signal is sampled for a specific period of time. This sampling timefor measurement is called the integration time. For the measX command, the integration time is fixedat 0.01 PLC. For 60 Hz line power, 0.01 PLC = 166.67 μs (0.01 PLC/60 Hz). For 50 Hz line power,0.01 PLC = 200 μs (0.01 PLC/50 Hz).The only difference between measX and intgX is the integration time. For measX, the integrationtime is fixed at 0.01 PLC. For intgX, the default integration time is 1 PLC, but can set to any PLCvalue between 0.01 and 10.0.After the command is called, all relay matrix connections remain closed, and the sources continue togenerate voltage or current. For this reason, two or more measurements can be made in sequence.The rangeX command directly affects the operation of the measX command. The use of the rangeXcommand prevents the instrument addressed from automatically changing ranges when the measXcommand is called. This can result in an overrange condition such that would occur when measuring10 V on a 4.0 V range. An overrange condition returns the value 1.0E+22 as the result of themeasurement.If used, the rangeX command must be in the test sequence before the associated measX command.All measurements except the meast command invoke a timer snapshot measurement to be made byall enabled timers. This timer snapshot can then be read with the meast command.In general, measurement commands that return multiple results are more efficient than performingmultiple measurement commands.Compliance limits: A compliance limit setting goes into effect when the SMU is on a measure rangethat can accommodate the limit value. For manual ranging, the rangeX command is used to selectthe range. For autoranging, the measi or measv command will trigger a needed range change beforethe measurement is performed. See Compliance limits (on page 3-3) for details.
