If noise-related errors are suspected, please consider the following countermeasures.
- Noise Countermeasures for Programming Fixtures
- Twist the signal and ground lines beyond the probe hard(PHX4xx) into a twisted pair.
- Connect all available GND lines on the probe hard(PHX4xx) to reinforce the ground path.
- Do not bundle multiple signal lines together with cable ties (this can cause crosstalk).
- Keep wiring as short as possible; limit any cable beyond the probe hard(PHX4xx) to within 30 cm.
- Use a regulated power supply (for example, from KIKUSUI) instead of a noisy switching power supply.
- Keep noise sources (such as motors) at a distance from the programming fixture.
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Separate the AC power sources for the programmer and for noise-generating equipment, and install reliable EMI-filter (e.g. Denki Seiki Noise Cut Transformers).
URL: https://www.denkenseiki.co.jp/products_category/nct/ - Consider changing the grounding method depending on the noise generation situation.
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For information on noise generated when the target power supply is turned on/off and countermeasures, please refer to the FAQ at the following link:
[FAQ: Regarding the effect of power noise and programmmer malfunction when turning the target power ON/OFF]
2. Ethernet Noise Countermeasures
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Use a switching hub with a metal chassis and built-in power supply that allows reliable grounding.
Recommended model: Allied Telesis AT-FS710/8
URL: https://www.allied-telesis.co.jp/products-list/at-fs710-8/ - Plug the hub’s 3-prong power cord into a grounded power strip.
- Use shielded Ethernet cables (STP or Category 7 and above).
- Avoid excessively long cables.
- Do not bundle multiple cables together with ties.
- Attach the ferrite core supplied with the AFX100 to the Ethernet cable.