--- title: "Model BH-1 | NIM Tail Pulse Generator (Obsolete)" date: 2025-01-06T10:19:58Z modified: 2025-10-01T04:58:09Z permalink: "https://www.berkeleynucleonics.com/model-bh-1-nim-tail-pulse-generator-obsolete/" type: page status: publish excerpt: "" wpid: 19706 --- [ ![](https://www.berkeleynucleonics.com/wp-content/uploads/bnc_academy_upper_banner.png) ](https://academy.berkeleynucleonics.com/) [](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/model-bh1.jpg) ![Model BH-1](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/model-bh1.jpg) - [ Quote ](/get-quote/?interested_product=Model%20BH-1%20|%20NIM%20Tail%20Pulse%20Generator%20(Obsolete)) - [ Contact ](/contact/) - [ Datasheet ](#technical-resources-section) - [ Price List ](/access-pricelist/) #### Model BH-1 | NIM Tail Pulse Generator (Obsolete) **The Model BH-1 is obsolete , please inquire about our [Model 670C ](/model-670C)as a direct replacement** The Model BH-1 is a tail pulse generator which simulates the broad range of pulses encountered in the nuclear field. Typical applications of the Model BH-1 include: determining the proper timing of linear gates and coincidence units, linearity measurements of amplifiers, threshold setting of discriminators and single channel analyzers, and measuring resolution flow noise amplifiers. ##### [Features](#features-section) ##### [Specifications](#specifications-section) ##### [Tech Resources](#technical-resources-section) ##### [Downloable Resources](#downloadable-section) ##### [Price List](#pricelist-section) #### Overview ##### Features - Repetition Rate: 10 Hz – 1 MHz - Delay: -50 ns to 10 ms - Rise Time: 20 ns – 50 µs (8 positions) - Fall Time: 50 ns – 1000 µs (11 positions) - Pulse Amplitude: to 9.99 volts into 50 Ω - Amplitude Integral Linearity: ±0.1% - Amplitude Jitter: < 0.002% RMS #### Specifications **Frequency** 10 Hz to 1 MHz, continuously adjustable. **External Trigger** Requires 1 volt, positive pulse. **Single Cycle** One pulse occurs each time the push button is pressed. **Single/Double Pulse** This toggle provides for a pulse pair whose separation is varied by the delay controls. Minimum separation is 50 ns. **Rise Time of Output (10-90%)** 20 ns to 50 us (in 11 steps), exponential shape and independent of decay time. **Decay Time Constant of Output(100-37%)** 50 ns to 1000 us (in 11 steps), exponential shape and independent of risetime for decay/rise time >10. **Trigger Out** Positive 3 volt pulse, 10 ns rise time, 0.2 us witdh, 50 ohms output impedance. **Delay** -50 ns advance to 10 ms delay (between Trigger Out and leading edge of output pulse). **Output Amplitude** Zero to 9.99 volts maximum. Adjustable by ten-turn potentiometer. **Attenuator** X10 and X100 providing up to 1000: 1. **Integral Linearity of Output** ±0.1%. **Duty Factor Effect** Amplitude shift less than 0.1% below 30% duty factor. Duty factor in percent for tail pulses is defined as: (8 decay time constants/pulse spacing) X100. **Output Polarity** Positive or negative. **Output Impedance** 50 ohms. **External Reference Input** ±15 volts max. **Jitter of Frequency and Delay** Less than 0.1%. **Temperature Coefficient of Output** Less than 0.03%/°C. **Amplitude Jitter (Resolution)** Less than 0.01% peak, 0.002% rms of pulse amplitude. **Power Required** +24 V at 50 mA, -24 V at 50 mA, +12 V at 175 mA, -12 V at 80 mA. **Mechanical Dimensions** Double-witdh AEC module, 2.70 inches wide by 8.70 inches high. Conformsto AEC Report TID-20893 (Rev. 2). **Weight** 3.5 lbs. net, shipping 7 Ibs. **Shipping Dimensions** 18x12x9″ **Shipping Weight** 5 lbs #### Technical Resources [ Model BH-1 Manual](https://www.berkeleynucleonics.com/download/27235/?tmstv=1778700939) [ Model BH-1 Datasheet](https://www.berkeleynucleonics.com/download/27238/?tmstv=1778700939) #### Downloadable Resources Downloadable resources such as datasheets, firmware, software, drivers and products manuals. Alternatively, you can browse resources directly by visiting our [downloads page](/downloads). - [Product Datasheets](/downloads#tm-datasheets) - [Product Firmware](/downloads#tm-firmware) - [Product Software and Drivers](/downloads#tm-softwaredrivers) - [Product Manuals](/downloads#tm-manuals) #### Price Lists [ Berkeley Nucleonics Price List 2026](https://www.berkeleynucleonics.com/download/19881/?tmstv=1778700939) [ ![](data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' viewBox%3D'0 0 1105 100'%2F%3E) ](https://academy.berkeleynucleonics.com/)