Agilent Technologies B1500A User's Guide download pdf (Page 118)

3-24 Agilent B1500 VXIplug&play Driver User’s Guide, Edition 3

Programming Examples for Visual Basic Users

Staircase Sweep Measurement

Table 3-6 explains example subprograms that enable/disable measurement channels

(perform_meas), perform the staircase sweep measurement (sweep_meas), and save

measurement result data into a file (save_data). This example measures MOSFET

Id-Vg characteristics. The subprogram uses the synchronous sweep source set by the

agb1500_setSweepSync function.

Table 3-6 Staircase Sweep Measurement Example 2

Sub perform_meas(vi As Long, ret As Long) ’1

Dim m(4) As Long ’SMU port numbers ’3

m(0) = 1 ’SMU1: drain

m(1) = 2 ’SMU2: gate

m(2) = 4 ’SMU4: source

m(3) = 6 ’SMU6: substrate

ret = agb1500_setSwitch(vi, m(3), 1) ’9

ret = agb1500_setSwitch(vi, m(2), 1)

ret = agb1500_setSwitch(vi, m(1), 1)

ret = agb1500_setSwitch(vi, m(0), 1)

check_err vi, ret ’13

sweep_meas vi, ret, m() ’15

ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0) ’17

check_err vi, ret

End Sub ’20

Line Description

1 Beginning of the perform_meas subprogram.

3 to 7 Declares variables, and defines the value.

9 to 12 Enables measurement channels.

15 Calls the sweep_meas subprogram (next page) to perform

staircase sweep measurement.

17 Disables measurement channels.

13 and 18 Calls the check_err subprogram (shown in Table 3-1) to check if

an error status is returned for the previous line.

20 End of the perform_meas subprogram.

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Agilent Technologies B1500A User's Guide Page 118