Model 2657A-PM-200 Protection Module
4
PA-1055 Rev. A / February 2012
Connections using a Model 2611A or 2612A SMU
Required accessories:
•
One Model 2600-TRIAX adapter per channel
•
Two or three standard triaxial cables (either Model 7078-TRX or 4200-TRX) per channel
•
Two or three high-voltage (HV) triaxial cables (Model CA-553 or CA-554) per channel
Connection summary
Use the connection drawing below to connect source-measure unit (SMU) channels of the Model 2611A or 2612A
to the Model 2657A-PM-200. For each channel, make sure to use the IN connectors of the the Model 2657A-PM-
200 for connection to the Model 2600-TRIAX and use the OUT connectors for connection to the device under test
(DUT).
The drawing shows connections for 4-wire sensing. For 2-wire applications, the SH (sense HI) connectors of the
Model 2657A-PM-200 are not used.
Connecting the Model 2600-TRIAX to the Model 2657A-PM-200 connects the LO terminal of the
Model 2611A or 2612A to protective earth (safety ground).
Do not convert triaxial cables to BNC cables. Using BNC cables removes protection from the Model
2611A or 2612A and may result in damage to the SMU. You must use triaxial cables to connect to the
lower-voltage SMU.
When using the 2657A-PM-200, HI and SH (sense HI) should be connected together at the device
under test. A potential difference between the two circuits in excess of 100 mV may result in
compromised measurements.
Large potential differences can be created when there is significant lead resistance and current
flowing in the HI lead. To minimize lead resistance, minimize the distance between the Model 2657A-
PM-200 and the device under test.
