Model 4200A-SCS Prober and External Instrument Control Section 6: Using a Model 82 C-V System
4200A-913-01 Rev. A December 2020 6-37
QTsweep82 user module
This user module uses the 595 to determine the equilibrium point for a device by measuring
quasistatic capacitance using different delay times.
Usage
status = QTsweep82(double Test_Bias, int LeakageCorrection, double Hold_time, double
V-Step, char *InstldStr, int InputPin, int OutPin, double Delay_Max, int Range,
double *CQS, int, CQS_ArrSize, double *QT, int QT_ArrSize, double *Delay_time, int
Delay_time_ArrSize);
Returned values are placed in the Analyze sheet; see Details
Voltage bias for capacitance measurements (−120 V to +120 V)
Hold time at the beginning of the sweep (0 s to 200 s; default 5)
Step voltage size: ±0 V, ±0.01 V, ±0.02 V, ±0.05 V, ±0.1 V
KCon instrument ID; default is CMTR1; can be CMTR1 to CMTR4, depending on
your system configuration
The DUT pin to which the 5951 input terminal is attached (−1 to 72); if a value of
less than 1 is specified, no switch matrix connections are made
The DUT pin to which the 5951 output terminal is attached (−1 to 72); if a value
of less than 1 is specified, no switch matrix connections are made
Maximum delay time: 1 s to 199.99 s (default 10 s)
The measurement range for the 595 to use: 1 to 3; see Details
Output; the measured array of quasistatic capacitance values
Output; the measured array of leakage current Q/T
Output; the array of Delay_Time used up to Delay_Max in logarithm scale
Details
The module measures quasistatic capacitance and leakage current as a function of delay time using
the 595. It is used to determine the equilibrium condition. Each quasistatic capacitance reading is
calculated from charge measurements performed on every two steps of a voltage sweep. Leakage
current at the end of each reading sample is also calculated (i = Q/t).
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