High Speed Spot Measurement - Agilent Technologies B1500A User Manual

Table 3-2

High Speed Spot Measurement

Table 3-2 explains example subprograms that enable/disable measurement channels
(perform_meas), perform the high speed spot measurement (spot_meas), and
display measurement result data (display_data). This example measures MOSFET
drain current.
High Speed Spot Measurement Example
Sub perform_meas(vi As Long, ret As Long)
Dim pins(4) As Long
pins(0) = 1
pins(1) = 2
pins(2) = 4
pins(3) = 6
ret = agb1500_setSwitch(vi, pins(3), 1)
ret = agb1500_setSwitch(vi, pins(2), 1)
ret = agb1500_setSwitch(vi, pins(1), 1)
ret = agb1500_setSwitch(vi, pins(0), 1)
check_err vi, ret
spot_meas vi, ret, pins()
ret = agb1500_setSwitch(vi, agb1500_CH_ALL, 0)
check_err vi, ret
End Sub
Line
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 spot_meas subprogram (next page) to perform spot
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.
Agilent B1500 VXIplug&play Driver User's Guide, Edition 3
Programming Examples for Visual Basic Users
High Speed Spot Measurement
'SMU port numbers
'SMU1: drain
'SMU2: gate
'SMU4: source
'SMU6: substrate
Description
'1
'3
'9
'13
'15
'17
'20
3-7