Keithley 2657A-PM-200 User Manual page 16

Model 2657A-PM-200 Protection Module
2. Configure the SMU to source current and measure voltage.
3. Program the current source level to 10 mA.
4. Set the voltage limit to 50 V.
5. Turn on the SMU output.
6. Verify that the voltage measured is between 30 V and 40 V.
7. Program the current source level of the SMU to -10 mA.
8. Verify that the voltage measured is between -30 V and -40 V.
Verification procedure D
Verify the operation of the diodes between LO and the chassis of the Model 2657A-PM-200:
1. As shown below, connect the SMU to the LO,SL triaxial connector of the protection module:
a. Connect the SMU force HI terminal to the inner shield of the LO,SL IN triaxial connector of the Model
2657A-PM-200.
b. Connect the SMU force LO terminal to the outer shield (chassis) of the LO,SL IN triaxial connector of
the Model 2657A-PM-200. The chassis is available at the outer shield of any of the triaxial connectors
on the Model 2657A-PM-200.
2. Configure the SMU to source current and measure voltage.
3. Program the current source level to 10 mA.
4. Set the voltage limit to 50 V.
5. Turn on the output.
6. Verify that the voltage measured is between 30 V and 40 V.
7. Program the current source level of the SMU to -10 mA.
8. Verify that the voltage measured is between -30 V and -40 V.
16
Figure 12: Connections for verification procedure D
PA-1055 Rev. A / February 2012