4-Channel Multi-Range Precision Digital Quench Detection System

Configurable Multi-Tap and Multi-Range Precision Digital Quench Detection System (QDS) for Superconducting magnet protection applications with 10/100/1000 Mbit Ethernet connectivity

  • Overview
  • Features
  • Technical specifications
  • Ordering options
  • Documentation
  • Software/Firmware


The easiest and most configurable way to dectect a quench in your superconducting magnet!

The QDS (“Quench Detection System”) is the new solution for any type of quench detection on superconducting magnets. It is composed by 4 independent channels, each one floating up to 100 V, that can be connected to voltage taps. The quench detection can be performed both in an absolute or differential way and the detection window can be configured from 1 ms to 1 s.

Each channel has eleven (11) different full-scale ranges, the largest one up to ±20 V (2.4 uV resolution) and the smallest one up to ±20 mV (2.5 nV resolution). The range of each channel can be set independently.

Each channel can float up to 100 V from ground and it is fed to a signal conditioning network that converts it with a 24-bit resolution and a 100-kHz sampling rate.

Interlock signals as well as output status signals are available for different uses – e.g. interfacing to a power supply for the superconducting magnet.

Multi-tap ABSOLUTE and DIFFERENTIAL measurements and configurable detection windows from 1 ms to 1 s.

The embedded FPGA can perform quench detection over different-scaled time windows (from 1 ms to 1 s).

A 10/100/1000 Mbit Ethernet connection (TCP-IP or UDP) allows for very fast data transmission and easy instrument control with several operating systems and programming languages. The internal firmware can be remotely updated, please check our website www.caenels.com in order to have the last available version installed on your QDS device.

GUI for device configuration monitoring and 12 V and 24 V driver for Persistent Switch available

A software application is provided with the QDS unit: the configuration of different time windows as well as absolute and relative quench thresholds can be set straighforward.

Two power outputs, one rated at 12 V and the other one at 24 V, can be used to drive a Persistent Switch.


  • 4-channel simultaneous sampling
  • Integration time configurable from 1 ms to 1 s
  • 11 full-scale ranges for each channel, ranging from ±20 V to ±20 mV
  • 24-bit ADC internal conversion
  • Absolute and differential quench thresholds
  • 10/100/1000 Ethernet Connectivity
  • 12-V and 24-V persistent switch drivers
  • Interlocks and output status signals
  • Firmware Remote Update
  • Auto-ranging functionality
  • On-board FPGA and soft-processor computations
  • Compact mechanical dimensions
  • Oscilloscope software available

Technical specifications




Input Channels


Input Polarity


Input Channel Type

Floating - up to 100 V

Voltage Measuring Range

RNG0: ±20 V
RNG1: ±10 V
RNG2: ±5 V
RNG3: ±2.5 V
RNG4: ±1.25 V
RNG5: ±625 mV
RNG6: ±312.5 mV
RNG7: ±156.25 mV
RNG8: ±78.125 mV
RNG9: ±39.0625 mV
RNG10: ±19.53125 mV

Voltage Resolution (LSB)

RNG0: 2.4 uV
RNG10: 2.5 nV

Internal Sampling Frequency

100 kHz

Sampling Resolution

24 bit

Integration Time (T)

from 1 ms to 1 s

Equivalent Input Bandwidth

(T =10 ms) 45 Hz
(T =50 ms) 9 Hz
(T =100 ms) 5 Hz
(T =500 ms) 1 Hz
(T =1 s) 0.55 Hz

Temperature Coeffi cient

0.0025 %/FS/K

Communication Interface

Ethernet 10/100/1000 TCP-IP or UDP

Internal Processing Unit

FPGA and soft-processor

External Signals

2 x External Interlocks
12-V and 24-V persistent switch power
Magnetic Relay

Input Connectors

Twin (“Twinax”) BNC

Interlock/Status Connector

Weidmueller 1290260000
(mating: Weidmueller 1277900000)

Additional Features

Firmware Remote Upgrade
Confi gurable Integration Time
Confi gurable absolute and differential quench thresholds


Blower Fan


174 x 175 x 44 mm


< 850 g

Supply Voltage

+12 V

Status Indicators

5 LEDs

Ordering options

Ordering code




4-channel Quench Detection System with Persistent Switch Heater – Ethernet-controlled


Last reviewed: 2023-02-09 ⓘ More infoRevision: 0.4

Last reviewed: 2022-12-09 ⓘ More infoRevision: 0.1

Last reviewed: 2023-02-03 ⓘ More infoRevision: 1.0

Last reviewed: 2023-02-09 ⓘ More infoRevision: 1.1

Last reviewed: 2024-02-05 ⓘ More infoRevision: 1.2


Updated: 2024-02-28 - 44.16 MB ⓘ More info Version: 2.2.1
OS: Linux

Updated: 2024-02-28 - 42.43 MB ⓘ More info Version: 2.2.1
OS: Windows

Copyright CAEN ELS s.r.l.