Model 4200A-SCS Parameter Analyzer Reference Manual
Section 2: Connections and configuration
4200A-901-01 Rev. C / February 2017
2-23
Pulse cards
The Keithley Instruments pulse cards are two-channel pulse generator instruments. There are two
pulse generator instruments available for the 4200A-SCS:
•
4220-PGU High-Voltage Pulse Generator Unit (PGU)
•
4225-PMU Ultra-Fast IV Pulse Measure Unit (PMU)
Both cards offer:
•
Two output channels
•
Standard (2-level) pulse
•
Segment Arb
®
waveform
Each output channel has two output ranges:
•
10 V (into high impedance, 5 V into 50 Ω)
•
40 V (into high impedance, 20 V into 50 Ω)
The 4220-PGU is a 2-channel voltage pulse generator. The 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.
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
Pulse measure and pulse generator units
(on page 5-1) for details on pulse card connectors
and connections to the DUT.
The next figure 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.
The HEOR provides fast, unlimited, open and close cycles for demanding tests such as flash memory
endurance. See
(on page 10-6) for details about the typical use of the
HEOR, which is a solid-state relay (SSR) for connecting or disconnecting a pulse channel from a
device terminal.
