-SCS Pulse Card (PGU and PMU) User's Manual Section 2:
4200A-PMU-900-01 Rev. B March 2023 2-5
Model 4225-RPM
The 4225-RPM is a remote amplifier/switch that is used as a current preamplifier for the 4225-PMU.
The RPM provides additional high-speed, low-current measurement ranges.
The RPM can also be used as a switch for the 4200-SMU, 4201-SMU, 4210-CVU, and 4215-CVU.
See Using the RPM as a switch (on page 2-9
).
RPM input, output, and top panels
The input, output, and top panels for the RPM are shown in the following figure.
Figure 4: 4225-RPM panels
The RPM connector on the input panel connects to one of the RPM connectors (channel 1 or channel
2) on the 4225-PMU. The RPM also has input connectors for a 4200-SMU or 4201-SMU
(source-measure unit) and a 4210-CVU or 4215-CVU (capacitance-voltage unit).
The previous figure shows modes for the RPM LED colors. During normal Clarius operation, only the
red, green, or blue lights are shown. However, other colors or color combinations are possible. For
example, during the 4225-PMU self-test, the RPM LED alternates between purple and green for the
majority of the test, but there is a portion of the test where the LED flashes red and green. During
firmware upgrade of the 4225-PMU, the RPM LED is green, but flashes red and green near the end
of the process. During firmware upgrade of the 4225-RPM, the RPM LED is blue at the start, and
changes to green for the remainder of the process.
The output status of the 4200A-SCS is indicated by the Operate light on the front of the
4200A-SCS chassis.
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