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Thanks Jim !!! This case is very strange. The receptor is capacitive touch. At 600KHz there aren't radiated pohenomena, so i filtered every channel with low pass filter. I used a single point ground, even GND trace guard. I connect to microcontroller only Vcc and GND, but the fault is the same...
Thanks Jim. I used Y capacitors (4.4nF) from each line to GROUND (product chassys). I used many filter in well-know configurations, with many cells (low pass, common and differential mode). But without variations. The injected current is common mode in each power line and should go from AC power...
Thank you!! I was very lucky and I will treasure what happened. I'll buy two DC block (working voltage 200V each) connected in series to the RF spectrum analyzer.
Thanks to all. I connect the instrument main supply to AC main network. After one hour I turned on the instrument. It seems to work properly. After calibration, all
work fine. I am very happy!
I think at the time of the fault, the instrument is going into protection. A colleague remembered...
Thanks to all. You give me hope of not having to throw it all away.
I don't understand the reason why the line voltage (220Vac) of my tested PCB passes from RF INPUT connector to internal switching power supply (and RF input survive) ...
During a measurement on a PCB with high and low voltage, an unexpected and unpredictable failure,
connected the mains voltage (220Vac) in RF input on my spectrum analyzer N932OB AG**ENT. I suppose the damage is (obviously) really serious. I am waiting next week to contact a service. I am very...
I have a problem with the test "Injected current" (under standard 61000-4-6).
The source of disturbance (AM wave modulated), is injected along the 115 Vac power line and propagates along the entire chain of supply (+12 V, +5 V and GND) of PCB. I tried to filter it with a common mode inductors...
Yes, the X2 capacitor is 0.15uF (150nF). This is an AC power line filter, and in gereral is used in opposite direction, to limit the conducted emission from devices to AC mains (opposite direction). It may not work peroperly.
Interference power from 30MHz to 300MHz on mains lead, measured by means of the absorbing clamp, is provided in CISPR 14-1: Requirements for household appliances, electric tools and similar apparatus. Is this related to measure of power in cable act as transmission line or measure of VSWR ?
Can...
Hi, ferrite bead for low frequency application (below 20MHz) available on the market, do not have high impedance (few tens of Ohm) and therefore do not have advantages over other components normally used as filters (R-L-C).
Hi Sirs,
i need information about ieee802.15.1 standard. Does anyone know if a device classified as a bluetooth 2.0 can be declared compliant ieee802.15.1 ?
Regards
Dear Sir,
i work in an electronic design company. We're reorganizing the various departments. I would like to hear from you, where to put EMC engineer in the design flow. I'm thinking of a versatile figure, taking over from start-up to final draft of the measures, which primarily diagnose and...
I am a hardware designer of home appliances. I am doing tests of immunity to electrical fast transients (BURST) of a PCB. On board there is a microcontroller, switching power supply, relays and cables connected to other devices. During the test (at any level), the microcontroller goes to fault...
Clock traces and GND
In general, clock/high speed traces on PCB, are made in microstrip and stripline topology. Sometimes i find speed traces with GND plane very close on same layer (near traces), sometimes far away. Why ?
Regards
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