Cooper Instruments & Systems DFI 250X Digital Weight Indicator User Manual
Page 9
CF 146
7
V- Rev. 1.0 - 003R-620-100
6.5.1 Cable Shield Connection and Earthing
•
Care should be taken when connecting shields to maximize EMC or RFI immunity and minimize earth loops
and crosstalk (interference) between instruments.
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For full EMC or for RFI immunity, termination of the cable shields at the earth lug is very important. The earth
lug of the instrument must be separately connected to ground potential via a reliable link.
•
The instrument should only be connected to earth via a single reliable link to avoid earth loops.
•
Where each instrument is separately earthed, interconnecting cable shields should be connected at one end
only.
•
Caution: Some load cells connect the cable shield directly to the load cell (and therefore the scale base).
Connection of the load cell cable shield in this situation may be site specific.
6.6 Regulatory Sealing Requirements
To comply with regulatory sealing requirements for each instrument, (i.e. to ensure instruments are not accidentally
or deliberately tampered with), it is important that proper sealing procedures be adhered to.
6.6.1 Sealing
Affix sealing stickers to the rear of the instrument, over one or more screws in the locations indicated.
Also affix a sealing sticker over the load cell cable where the cable-tie strain relief is attached, as indicated.
Affix stickers in the locations indicated.
7.0 INSTRUMENT SETUP
7.1 Calibration Counter
The built-in calibration counter(s) monitor the number of times trade critical settings are altered. Refer to Trade
Critical Settings below for more information and to the OPTION:USE setting section 7.6.
The table below describes when the counter(s) will increment.
Industrial or OIML: The Calibration Counter increments when trade critical settings are changed. An example of
the counter is C.00019.
NTEP: Two counters display.
The Calibration Counter increments when trade critical settings in the Calibration (CAL) menu are changed. An
example of the counter is C.00010.
The Configuration Counter increments when other trade critical settings (i.e. not in the CAL menu) are changed.
An example of the counter is F.00009.