OHM-Stat CT-8900 Owner's Manual page 17

Multiple meters may be connected to one computer via Static Solution's numerous mult-istation options which include RS232 to
wired Ethernet converters, RS232 to wireless Ethernet converters, or multi RS232 port PCI cards in a computer. The specific
hardware installation and setup instructions of these options are included in separate manuals that are supplied with each of these
options.
Some of these options require the meter to be connected to a remote computer located quite some away, in which case the following
section applies.
Long distance wiring warning advisory
The following advisory only applies to meters that are connected to remote computers via long cables:
As with any long distance wiring, proper grounding precautions should be considered. If the building in which the test stations are
located is improperly wired, or contains ground faults, or if the computer power supply is faulty, a shock hazard may exist.
If the tester is connected to the computer via a cable, and if the computer is located outside the local area, a voltage potential
difference could arise if the computer ground is not at the same voltage potential as the local ground near the test station. For
example, if the computer ground differed by 40 volts from a light switch cover plate on the wall located near the test station, and if an
employee touched the light switch while pressing the test station test button or standing on the test station foot plate, a mild electrical
shock hazard might arise. The tester has internal 20K limiting resistors to mitigate such a problem, but not eliminate it.
Thus it is advisable

not to locate the test station within reach of a metal object that might be grounded

and/or connect the meter ground (i.e. the power supply connector outer ground terminal ) to the local ground
When finished installing the test stations, be sure to test, and periodically retest, the voltage potential from the CT8900 combo tester
push button to the nearest local ground. If the building is properly wired, there should normally be no more than a few volts
difference.
Neither Static Solutions Inc, nor its distributors, accepts any liability for such hazards, as stated in the liability disclaimer.
Static Solutions CT-8900 Combo Tester Instructions
Multi-station hardware setup
17 7/22/2009