13: LPT library function reference Model 4200A-SCS Parameter Analyzer
13-78 4200A-901-01 Rev. C / February 2017
measX
This command allows the measurement of voltage, current, or time.
Usage
int meast(int instr_id, double *result);
int measi(int instr_id, double *result);
int measv(int instr_id, double *result);
The instrument identification code
The variable assigned to the result of the measurement
Details
For a measurement conversion, the signal is sampled for a specific period of time. This sampling time
for measurement is called the integration time. For the measX command, the integration time is fixed
at 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 integration
time is fixed at 0.01 PLC. For intgX, the default integration time is 1 PLC, but can set to any PLC
value between 0.01 and 10.0.
After the command is called, all relay matrix connections remain closed, and the sources continue to
generate 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 rangeX
command prevents the instrument addressed from automatically changing ranges when the measX
command is called. This can result in an overrange condition such that would occur when measuring
10 V on a 4.0 V range. An overrange condition returns the value 1.0E+22 as the result of the
measurement.
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 by
all 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 performing
multiple measurement commands.
Compliance limits: A compliance limit setting goes into effect when the SMU is on a measure range
that can accommodate the limit value. For manual ranging, the rangeX command is used to select
the range. For autoranging, the measi or measv command will trigger a needed range change before
the measurement is performed. See Compliance limits (on page 3-3
) for details.
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