---
title: "Model DB-2 | NIM Random Pulse Generator"
date: 2025-01-06T10:25:21Z
modified: 2026-03-10T15:17:52Z
permalink: "https://www.berkeleynucleonics.com/model-db-2-nim-random-pulse-generator/"
type: page
status: publish
excerpt: ""
wpid: 19714
---

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![DB-2](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/db-2.png)

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- [ 
     Datasheet
     ](#technical-resources-section)
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     Price List
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#### Model DB-2 | NIM Random Pulse Generator

The Model DB-2 is a pulse generator which accurately simulates the random and pile-up characteristics of pulses from a radiation detector. It provides pulses which are mono-energetic over a broad range of average count rates. Under high count rate conditions, the pulses will pile up as shown in the diagram below. This characteristics is useful in determining pile-up or count-rate effects and in measuring the resolution of high count rate spectroscopy systems. Besides random pulse, the Model DB-2 also provides mono energetic repetitive pulses. In this mode, the DB-2 is an excellent general purpose pulser. When the EXT REF input is used with an external ramp, the DB-2 provides sliding pulses to quickly check system or component linearity.

##### [Features](#features-section)

##### [Specifications](#specifications-section)

##### [Tech Resources](#technical-resources-section)

##### [Downloable Resources](#downloadable-section)

##### [Price List](#pricelist-section)

#### Overview

##### Features

- Random Tail pulses for MCA, PHA Pile-up and Dead-time Testing
- Continuously Adjustable Rates from 10 Hz to 1 MHz

#### Specifications

**Rep Rate (Count Rate)**

10 Hz to 1 MHz \[ Continuously Adjustable\]

**Mode**

Random or Repetitive

**Random Distribution**

Poisson for intervals greater than 1.4 µs

**Pulse Shape**

Tail Pulse

**Rise Time of Outputs (10-90%)**

0.1-20 µs ( 8 steps )

**Decay Time Constant (100-37%)**

5-1000 µs ( 8 steps )
Rise and Decay time independent of each other for Decay Time/ Rise Time > 10.

**Pulse Amplitude (STEP) Characterization**

**Amplitude Shift with Count Rate**: < 0.05% from 10 Hz to 100 kHz
**Jitter (resolution)**: 0.01% RMS
**Temperature Coefficient**: 0.02%/˚C

**Frequency Jitter** (Repetitive Mode)

< 0.1%

**External Trigger Input**

Requires 1 V Positive Pulse
1 kΩ input impedance

**Trigger Output**

3 V 100 ns Pulse Width
20 ns rise time
50 Ω Output impedance

**Output Amplitude Ranges**

**Repetitive**: 0 to 10 V 
**Random**: 0 to 1 V 
Adjustable by 10-turn Potentiometer from zero to maximum.

**Normalize**

40% to 100% of Amplitude via 10-Turn Potentiometer

**Pulse Output Polarity**

Positive or Negative

**Attenuation**

4 Step Attenuators \[x2, x5, x10, and x10\] combination to make maximum of x1000

**External Reference Input**

0 to 10 VDC; 10kΩ Input impedance

**Power Requirements**

\+ 24 V at 65 mA
– 24 V at 65 mA
+12V at 140 mA
-12 V at 40 mA
**\***See BNC _**[Model AP-3](/model-ap-3)**_ for portable applications

**Dimension**

Double-width NIM module; 2.70″ wide by 8.70″ high in accordance with TID-20893 (Rev. 3)

**Weight**

3.5 lbs. net; 7 lbs. shipping

**Shipping Dimensions**

18x12x9″

**Shipping Weight**

10 lbs

#### Technical Resources

[ Model DB-2 Datasheet](https://www.berkeleynucleonics.com/download/27272/?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#nim-datasheets)
- [Product Firmware](/downloads#nim-firmware)
- [Product Software and Drivers](/downloads#nim-softwaredrivers)
- [Product Manuals](/downloads#nim-manuals)

#### Price Lists

 [ Berkeley Nucleonics Price List 2026](https://www.berkeleynucleonics.com/download/19881/?tmstv=1778700939)



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