UHF-CNT Pulse Counter
The UHF-CNT Pulse Counter features analysis of up to 4 pulse trains in parallel, enabling event based measurements, e.g. photon detection using photo-multiplier tubes. There are five distinct modes of operation and each channel offers an adjustable discriminator. The maximum count rate is 225 MHz. Measurement results from the pulse counters can be conveniently analyzed with the LabOne® toolset, which features time domain and histogram display. Through the cross-domain trigger engine, branching conditions for the UHF Arbitrary Waveform Generator can be defined based on counter values, enabling ultra-fast feed-forward loops for quantum error correction.
UHF-CNT Key Features
4 counter modules
225 MHz maximum count rate
5 modes: manual, triggered, free, gated and pulse tagging
4 signal inputs with adjustable discriminator level
Background subtraction using 2 counter modules
Count integration
UHF-CNT Applications
Quantum optics
Trapped ion experiments
Diamond N/V center experiments
Phosphorescence Lifetime Imaging (PLIM)
UHF-CNT Upgrade and Compatibility
Option upgradeable in the field
Compatible with all other UHF options
UHF-CNT Functional Diagram
UHF-CNT Description
The UHF-CNT Pulse Counter enables measurement of randomly distributed pulses and can operate with the following modes:
- Free running mode: the counter runs in repeated periods defined by the a configurable timer. At the beginning of each period the counter is reset, and at the end, the accumulated number of counts is output.
- Gated mode: the counter is controlled with the gate input signal. The counter is enabled at the rising edge of the gate input signal and disabled at the falling edge. The accumulated number of counts is output on the falling edge of the Gate Input signal.
- Gated free running mode: similar to the free running mode, but additionally the Gate Input signal controls when the counter is allowed to run. The counter as well as the timer is reset when the Gate Input signal is low.
- Time tagging: every single event is counted and transmitted to the host computer along with a time tag.
All modes feature background subtraction, i.e. taking into account measurement values from two separate counters, and count integration over time. Via the 1GbE or USB interface, the counter data can be streamed to the host PC where they can be analyzed using the LabOne toolset.
In combination with the UHF Arbitrary Waveform Generator the UHF-CNT features advanced cross-triggering functionality for complex pulsed experiments in quantum optics. Counters can be initiated and reset by the UHF AWG, and vice versa, counter values can serve as a trigger or branching conditions for the UHF AWG.
UHF-CNT Specifications
General
signal inputs
4 Trigger Inputs, 32 DIO
# counter modules
4
counter value depth
32 bit (4.29 Gcounts)
maximum count rate
225 MHz
time resolution
4.44 ns
run modes
manual, triggered, free-running, gated, pulse-tagging
signal input impedance
50 Ω/1 kΩ
dead time between periods
<30 ns
signal input (discriminator) range
–2.5 V to +2.5 V (50 Ω input impedance)
–5 V to +5 V (1 kΩ input impedance)signal input (discriminator) resolution
<0.2 mV
signal input (discriminator) hysteresis
100 mV
描述 [描述] UHF-CNT脉冲计数器可同时分析多达4个脉冲序列,从而实现基于事件的测量,例如使用光电倍增管的光子检测。有五种不同的操作模式,每个通道提供一个可调鉴别器。最大计数率是225MHz。