Electrical specification
33
The 1902 must be powered from a CED-approved power
supply if it is to meet the EN 60601-1-1:2000 safety and
EN 60601-1-2:2001 EMC standards. The Powerbox™ model
PMP55-32-J12 is the current (April 2008) approved supply.
This power supply accepts mains voltages from 100 V AC to
240 V AC at frequencies from 50 Hz to 60 Hz, without needing
adjustment by the user. The 1902 power supply draws typically
30 VA.
There is electrical earth continuity from the mains plug and
mains cable, through the power supply and DC cable, to the
1902 can and case, and all connector bodies apart from the
isolation amplifier. (The ‘Cable screen’ pin of the isolation
connector is AC-coupled to mains earth through a 1 nF, 6 kV
working capacitor.) The 1902 power supply must be plugged
into a mains socket with a good earth.
For applications that do not need EN 60601-1 isolation, the
1902 can be powered from another suitable source of stable
power. Any such power supply must have a mains earth
through-connection. The 1902 requires approximately 220 mA
at +5 V, 75 mA at +15 V and 20 mA at –15 V, plus whatever
current is required for external transducers (see page 28).
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