![](/assets/images/picto-drapeau-france-3a76576a5d60a512053b4612ab58dae5.png)
4. Zero detectors
In so-called "zero" measurement methods, bridge equilibrium corresponds to the cancellation of a potential difference between two well-defined points of the circuit when it is energized. The voltmeter, which measures this potential difference, plays a vital role. It must enable this balance to be achieved as accurately as possible. To this end, it must possess certain specific characteristics, essentially linked to the fact that we're dealing here with AC measurements, and be used with certain precautions. In particular, it must be able to detect the useful signal, which becomes very weak in the vicinity of equilibrium, while remaining as insensitive as possible to any parasitic signals and noise, which can then become predominant. This is why we recommend always working at frequencies slightly offset from those of the power supply or its harmonics. There are currently two main approaches...
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference
This article is included in
Electronic measurements and tests
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Zero detectors
Bibliography
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
EGG Signal Recovery :
Zurich Instruments :
https://www.zhinst.com/europe/fr
Stanford Research Systems :...
Statistical and economic data
The specifications of some synchronous detectors are given in table 1 .
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
![](/assets/images/logo-eti-286623ed91fa802ce039246e516e5852.png)
The Ultimate Scientific and Technical Reference