212/212X Installation & Technical
8200-M639-O1 Rev D 09/14
RFI Immunity
The operation of sensitive electronic equipment can be adversely
affected by RF (Radio Frequency) radio transmissions. Digital
weight indicators are one such type of equipment. Radio
transmissions come from things like hand-held radio transmitters
and cell phones. One symptom of RFI (Radio Frequency
Interference) in a digital weight indicator is weight indication
instability during a radio transmission.
Cardinal digital weight indicators are designed with special
grounding and RFI shielding to achieve a high degree of immunity
to common RFI. To maximize the digital weight indicator’s
immunity to radio transmissions, follow these guidelines:
1. ALWAYS use shielded cable for all I/O (Input/Output)
connections to the digital weight indicator.
2. NEVER operate any radio transmitter within 2 meters (~6ft.) of
the weight indicator.
3. NEVER connect un-terminated serial, digital, or analog I/O
cables to the internal printed circuit boards of the digital weight
indicator.
4. KEEP the intended external I/O devices connected to I/O cables
interring the digital weight indicator.
5. ALWAYS connect the shield of the shielded cable to the
indicator back panel gland connector or other closest ground
terminal inside the indicator.
6. ALWAYS connect the shield of the shielded I/O cable at the
indicator end only. Leave the shield unconnected at the I/O
device.
To Next Page
Loading...
Need help?
General
