Tail Pulse Generator BNC Model BL-2

The Model PB-5 replaces the BH-1. Along with a suite of features and modes, the PB-5 is widely respected for its 155 uV amplitude resolution

FEATURES

  • Fast, Linear, Stable
  • 5 ns Minimum Width
  • 3 ns Minimum Rise Time
  • Double Pulse Capability
  • Adjustable Rise and Decay Times
  • Repetition Rates up to 50 MHz

DESCRIPTION

The Model BL-2 is a versatile, tail pulse generator capable of simulating the outputs from a wide range of detectors, photomultiplier tubes, and related electronics. It offers good linearity and stability, and fast, narrow pulse capability. Having a broad range of rise and decay times, the Model BL-2 can simulate the shorter pulses of plastic scintillators and lead glass as well as the longer pulses of NaI, many liquid scintillators, and amplifier outputs. The Model BL-2 enables the user to check electronics for linearity, resolution, rise time effects, count rate effects, and overload effects. Of particular interest to those that wish to check pulse pair resolution and count rate effects is that the BL-2 can operate in a double-pulse mode, with a pair of pulses having an adjustable separation that can be as low as 10 ns. Since repetition rates are variable to 50 MHz, a 100 MHz repetition rate is possible by double pulsing. The high repetition rates enable the user to quickly accumulate the large number of counts needed for good statistics.

 

Other features include an:

  • External Reference input, where an incoming signal controls the output pulse amplitude
  • External Trigger mode, where an incoming pulse triggers an output pulse
  • External Drive mode, where an incoming pulse controls both output pulse width and timing.

 

 

INPUTS and OUTPUTS

External Trigger: 1 V positive pulse triggers a pulse (single or double), with internal delay and width controls operative. 50 Ohms input impedance, +/- 5 V maximum input.

Drive: 1 V positive pulse generates an output pulse with a width equal to the width of the incoming pulse, internal delay and width controls are operative. 50 Ohms input impedance, +/- 5 V maximum input.

Internal / External Reference: With Internal Reference, the output pulse amplitude is controlled only by the Amplitude and Normalize controls.

With External Reference, an applied positive level controls the output pulse amplitude.

Input: +5 V max, 5 k input impedance.

Output Amplitude:

Flat Top: 0.0 V to 2 V into 50 Ohms, 0.0 V to 4 V into high impedance, continuously adjustable with ten-turn potentiometer. 50 Ohm source impedance.

Tail Pulse: 0.0 V to 1.5 V into 50 Ohms, 0.0 V to 3 V into high impedance, continuously adjustable with ten-turn potentiometer. 50 Ohm source impedance.

Polarity: Simultaneous positive and negative pulses are available.

Trigger Out: Positive 3 V pulse, 10 ns rise time, 50 Ohms output impedance. 

 

GENERAL

Amplitude Characteristics:

Temperature stability: less than 1% variation from 0-50 oC.

Duty cycle variations: Less than 1%up to 90% duty factor.

Linearity: less than 1% integral nonlinearity.

Power Requirements: +12V at 500 mA, -12V 400 mA, +6V at 80 mA, -6 V at 425 mA.

 

CONTROLS

Single cycle: One pulse occurs each time the push button is depressed.

Normalize: Multi-turn potentiometer will vary the amplitude up to 50%.

Rise Time (10-90%):

Tail Pulse: 3 ns to 250 ns in six steps.

Flat Top: 4 ns to 250 ns in six steps.

Decay Time Constant (100-37%): 5 ns to 10 µs in eight steps.

Frequency: A: 10 Hz to 50 MHz, continuously adjustable with coarse and fine controls. B: External trigger, 0 Hz to 50 MHz

Delay: 10 ns - 10 ms, continuously adjustable with coarse and fine controls.

Width: 5 ns - 5 ms, continuously adjustable with coarse and fine controls.

Flat Top / Tail Pulse: Toggle switch selects the output pulse shape. The width controls are functional only in the flat top mode.

Single/Double Pulse:  In the single-pulse mode, a single output pulse occurs which is delayed from the Trigger Out  by an amount determined by the Delay controls. In the double-pulse mode, two equal-width out pulses occur. The first pulse is simultaneous with the Trigger Out. Pulse separation set by delay controls.

 

PHYSICAL

Size: Triple width NIM module 4.05" wide x 8,70" high in accordance with TID-20893 (Rev. 3).

Weight: 4.5 lbs. (2 kg) net; 7lbs. (3.2 kg) shipping.