PGU and PMU connectors
The connectors for the PGU and PMU pulse cards are shown in the following figure.
Figure 3: 4220-PGU and 4225-PMU connectors
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 2-8).
RPM input, output, and top panels
The input, output, and top panels for the RPM are shown in the following figure. 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 following figure shows the modes for the RPM LED colors. Note that the RPM LED shows the
mode of the RPM, but not the output status. The output status of the 4200A-SCS is indicated by the
Operate light on the front of the 4200A-SCS chassis. During normal Clarius operation, only the red,
green, or blue lights are shown. However, other colors or color combinations are possible, and are
normal part of the RPM operation. During 4225-PMU self-test, the RPM light is green, but there is a
portion of the test where the LED flashes red and green. During the 4225-RPM self-test, the RPM
LED alternates between purple and green for the majority of the test. During firmware upgrade of the
4225-PMU, the RPM LED is green, but flashes red and green near the end of the process. During
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