| A tester that employs a non-contact type voltage sensor to simply and easily detect the ingress routes and spectra of electrical noise
Recently, electronic inverters have come into common use in many products to facilitate efficient control and energy savings. However, such electronic products are frequently recognized to be sources of electrical noise.
In addition, many electronic devices are now linked to form networks for efficient data communications. However, when noise ingress occurs on a network, the affected area can be large. Furthermore, the increasing speed and density, and decreasing operating voltage of semiconductors employed in electronic products exacerbate their susceptibility to noise.
Measure and Display the Noise Spectrum
The HIOKI NOISE SEARCH TESTER 3144 is being introduced into this environment as a new type of instrument that can simply measure and display the spectrum and relative level of electrical noise affecting products under actual, on-site operating conditions, including the capability for long-term measurement data recording.
Conducted interference is one type of noise that can cause problems with electronic products such as communications equipment. It propagates through communications and telephone lines and other conductors as common-mode electromagnetic noise relative to ground.
Pair with Model 9741 Sensor (included)
Used together with CLAMP ON NON-CONTACT VOLTAGE SENSOR 9741, Model 3144 can measure this common-mode noise under actual operating conditions. The design of this tester eliminates the problems with previous voltage detection methods that generated their own noise by requiring direct contact with the system under test to obtain the test voltage, or required shutting down the network to isolate devices from the noise.
Large LCD
The large LCD on Model 3144 displays noise spectral components captured by the clamp-on sensor as seven graphic level meters covering the range of 500 Hz to 30 MHz.
Typical Noise Sources
Typical major sources of noise that enters equipment through cables are:
- Mains frequency to 1 kHz: Noise ingress from power transmission lines and electric railways
- Several kHz to several hundred kHz: Noise ingress from electronic switching inverter devices
- Several hundred kHz to several MHz: Noise ingress from medium wave (AM) broadcast transmitters
- 10 MHz to several hundred MHz: Noise ingress from CB and amateur radio transmitters
Such noise sources can be distinguished according to the noise spectrum displayed on the Model 3144.
Logging Function
Model 3144 includes a logging function that records up to 64,000 measurement points in internal memory.
The measurement interval can be set from one second to 60 minutes in 13 steps, so the measurement time and level in each frequency range can be recorded over long periods. Supplied software enables recorded data to be transferred to a PC via USB interface for graphical display and capture as BMP bitmap files.
The instrument also includes an analog output for monitoring noise voltage waveforms by connecting an oscilloscope.
As described above, the compact and light weight Model 3144 is a practical, user-friendly device for detecting electrical noise very simply and safely by making measurements that previously required an expensive spectrum analyzer and direct connection to obtain the test voltage. It is certain to enhance efficiency of noise immunization tasks.
The commercial development of this product is based on technology of the Technological Cooperation Center of NTT East, a Japanese telecommunications company. |
