Executing the Program
You should have already added the bias source control routine and set up the
measurement environment as described previously.
Before running the program, do following:
1. Set the GPIB address of instruments as follows:
•
4155/4156: 717
•
E5250A: 722
•
Bias Source: Set the GPIB addresses to match your control routine
(Address 701 to 703 are defaults used in SP_MUX_M program)
2. Turn on all instruments and the computer.
3. Boot up HP BASIC operating system.
4. Insert a diskette into the computer's disk drive. The diskette must contain the
HCI test program (SP_MUX in this example) you modified in "Adding the Bias
Source Control Routine" on page 9-23.
5. Specify the computer's mass storage device (disk drive) the diskette is inserted
by using MSI statement. For example, if the device is ":CS80,702,1", enter the
following command:
MSI ":CS80,702,1"
6. Load your HCI test program. The following example loads and displays
SP_MUX program, in this example.
LOAD "SP_MUX"
EDIT
7. Insert the E5250A Program Disk into the 4155/4156's disk drive, then get the
setup file IDVD.MES to set up the 4155/4156.
8. Enter the following command from the command line of the computer:
OUTPUT 722;":ROUT:CLOS (@10101,20101,30101)"
9. Press Single key on the 4155/4156's front panel. The Id-Vds measurement is
performed and the Id-Vds measurement result is displayed as shown in Figure
9-5.
10. Determine the drain stress voltage (Vdstr) from the above curve.
Recommended maximum value is about 0.5 V below actual breakdown. Then,
edit the HCI test program (SP_MUX in this example) , and define the Vdstr
value. The value should be defined in the following program line.
Agilent E5250A User's Guide, Edition 11
Executing Sample Programs
HCI Measurement Program
9-27