4200-900-01 Rev. K / February 2017 Return to Section Topics 1-21
Model 4200-SCS User’s Manual Section 1: Getting Started
The 4220-PGU is a 2-channel voltage pulse generator. The Model 4225-PMU is also a
2-channel voltage pulse generator, but includes integrated simultaneous current and voltage
measurement with two A/D converters for each channel.
Both can be isolated from the DUTs by a high endurance output relay (HEOR). The HEOR is
typically used for applications that require high-speed, high-volume switching of the output.
A pulse card can be programmed for continuous pulse output or set to output a finite number of
pulses (burst or trig burst triggering modes). The pulse amplitude can be set from
100 mV to 40 V. The pulse period can be set from 20 ns to 1 s with a minimum pulse width of
10 ns. Transition times (pulse rise and pulse fall) can be set independently. Refer to Pulse card
settings for details on all pulse card settings.
NOTE Pulse amplitude can be set as high as 80 V depending on the pulse high and low
levels, pulse output range, and DUT load settings.
Refer to the Reference Manual, Pulse source-measure connections, page 11-38 for details on
pulse card connectors and connections to the DUT.
Figure 1-19 shows a simplified schematic of the 4220-PGU pulse card single channel output. The
range relay chooses between the high-speed and high-voltage output ranges. The schematic for
the 4225-PMU is similar except it also includes measure circuitry for both current and voltage (see
Figure 16-2 on page 16-5 in the Reference Manual).
The HEOR provides fast, unlimited, open/close cycles for demanding tests such as flash memory
endurance. The HEOR is also known at the SSR (solid state relay), See Segment ARB waveform
for more details about the typical use of the HEOR, which is a solid-state relay for connecting or
disconnecting a pulse channel from a device terminal.
Figure 1-19
Simplified schematic of each Model 4220-PGU channel
About the pulse cards
The following chart shows a comparison of features between the 4220-PGU and the 4225-PMU:
Table 1-1
Feature comparison of pulse cards
Feature 4220-PGU 4225-PMU
Standard (2-level) Pulse Yes Yes
Segment ARB Yes Yes
Range Relay:
High Speed or
High Voltage
High Endurance
Output Relay (HEOR):
Closed or Open
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