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Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3 4-9

Programming Examples for C++ Users

Multi Channel Spot Measurement

Table 4-3 explains an example subprogram that performs the multi channel spot

measurement. The following subprogram will apply voltage to a bipolar transistor,

measure Ic and Ib, calculate hfe value, and display the measurement result data.

Table 4-3 Multi Channel Spot Measurement Example

void perform_meas (ViSession vi, ViStatus ret) /* 1 */

{

ViInt32 emitter; /* 3 */

ViInt32 base;

ViInt32 collector;

emitter = 1; /* SMU1 */

base = 2; /* SMU2 */

collector = 4; /* SMU4 */ /* 8 */

ret = agb1500_setSwitch(vi, emitter, 1); /* 10 */

ret = agb1500_setSwitch(vi, base, 1);

ret = agb1500_setSwitch(vi, collector, 1);

check_err (vi, ret); /* 13 */

ViReal64 vc; /* 15 */

ViReal64 vb;

ViReal64 iccomp;

ViReal64 ibcomp;

vc = 3;

iccomp = 0.1;

vb = 0.7;

ibcomp = 0.01;

ViInt32 mch[3];

ViInt32 mode[2];

ViReal64 range[2];

ViReal64 md[2];

ViInt32 st[2];

ViReal64 tm[2]; /* 29 */

Line Description

1 Beginning of the perform_meas subprogram.

3 to 8 Declares variables, and defines the value.

10 to 12 Enables measurement channels.

13 Calls the check_err subprogram (shown in Table 4-1) to check if

an error status is returned for the previous line.

15 to 29 Declares variables, and defines the value.

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