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Model 3401/3402
Keithley Instruments, Inc.
28775 Aurora Road
Pulse Pattern Generator Specifications
Cleveland, Ohio 44139
(440) 248-0400
www.keithley.com

1. Basic Modes of Operation
The 340x generator may be set in one of four available modes, Pulse, Pattern, Burst and External Width.
Pulse Mode delivers a single pulse per trigger event to the outputs. The pulse is programmable in delay
and duration.
Burst Mode results in a `burst' of n pulses per trigger event, with pulses configured similarly to single
pulses in Pulse mode.
Pattern Mode delivers a programmable pattern per trigger event to the outputs. The pattern is
programmable, or may be selected from a library of pre-configured patterns. The pattern may be presented
in either NRZ or RZ formats. In NRZ mode, the pattern crossing point is programmable. In RZ mode the
duration (duty cycle) of the pattern pulse is programmable.
External Width Mode makes the pulse level follow the edges of the Ext In input. A rising edge causes the
output to go high, while a falling edge causes the output to go low.
2. Interfaces
The 340x generator may be controlled via the front panel GUI interface, a GPIB interface, or a USB interface.
IEEE 488.2, SCPI compliant.
3. General Mechanical Characteristics
Size: 439 mm (17.3 in) wide x 87 mm (3.4 in) high x 393mm (15.5 in) deep
Weight: 6.80 kg (15.0 lbs)
4. Specifications
Pulse / Level Parameters Specification
100mV to +10V 50 into 50
Pulse Amplitude1
200mV to +20V 1k into 50
-10V to +10V 50 into 50
Level Window2
-20V to +20V 1k into 50
Amplitude Accuracy3