• Model 202H

Fast High Voltage Pulses with Delay and Width Control

The Model 202H is a high-voltage (300V) plug-in module for BNC Model 6040 Mainframe. It offers nanosecond risetimes and very low jitter. The sharp edges of the 202H are ideal for testing components, gating flashlamps, triggering capacitor banks, or other experiments requiring high voltage pulses. The voltage is terminated into 50 Ohms. The pulse amplitude and width are adjustable via the front panel or remote programming. The Model 202H may be triggered with an internal rate generator, external trigger, or external modulation. There is an ECL output, a Pulse Out from BNC Model 6040 Mainframe, and a High Voltage Pulse Out from the 202H module (BNC connector).



  • Trigger Internal 0.01 Hz to 100 MHz; external 0 to 100 MHz
  • Pulse Width 3 ns to 5mS
  • Impulse 400 ps typical (fixed)
  • Delay 0 ns to 5mS (plus fixed delay)


  • Photo Multiplier
  • Photo Detector
  • Fiber Optics Testing

202H - Scope Screen Captures (Abberation, Fall, Delay, Pulse, & Rising)








Amplitude 20 V to 300 V into 50 ohms. Fixed 0 V baseline. Polarity internally switch selectable.
Resolution 2 V (to max. amplitude).
Linearity +/- 1%.
Transition Times (10% to 90%) Leading edge: 3nS typical (5 ns max); Trailing edge 1O ns typical (longer with lower amplitude)
Max. Power 18 W average, 1.8 kW peak (at 300 V).
Max. Current 6 A peak.
Droop 0.005% us max.
Aberrations +/- 5% of amplitude (2% typical).
Settling Time 5 ns.


TriggerInternal 0.01 Hz to 500 kHz; external 0 to 500 kHz. Rates to 1 MHz at lower amplitudes.
Pulse Witdh12 ns to 5mS (see Droop). Calibrated at 300 V; at lower amplitudes true witdhs increase slightly in fixed value up to 10 ns max.
Duty Factor1% max. at 300 V. Duty factors increase up to 25% at 20 V.
Delay0 ns to 640seconds (plus fixed delay).
Minimum Interpulse Separation200 ns (trailing to leading edges).
Module Delay55 ns typical (fixed) mainframe's Pulse Out to module's Pulse Out. Jitter 25 ps rms.


A ROM determines the instrument's allowable operating conditions and units of display applicable for the installed module.

A nonvolatile memory (RAM) in each module stores up to ten complete settings of operating conditions (trigger level, slope, etc.) and output pulse parameters.


The RAM-stored settings can be manually or bus transferred to the mainframe to produce the predetermined outputs.


2 Ibs net (0.9 kg); 5 Ibs shipping (2.3 kg).


Same as Model 6040 mainframe.

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