Electrical specification
27
The ‘Wire colour’ columns in the tables below are for your
convenience if you have to make up cables. All 1902 sockets
are drawn as the user sees them, i.e. viewed from outside. This
is also the view of the backs of their mating plugs as seen while
wiring them up!
The 1902 Mk IV is fitted with a 6-pin
DIN socket with a metallic shell that acts
as a screen. To conform with safety
requirements, mating plugs must be of the
type with a plastic outer sleeve; the inner
metallic body must be fully inserted into
the plastic sleeve whenever the plug is in
use.
1
1 Input +ve Left leg
2 Input –ve Left arm
3 Buffer input / +iso power
2
Right arm
4 Buffer output / –iso power
2
Vagus
5 Common
4
6 Common Common
Shell Cable screen
3
Cable screen
3
Notes
1 The ECG lead configurations are leads:
I, II, III, aVR, aVL, aVF and V.
2 Buffer I/O available with the CED1902-4-B buffer option
(see page 39). Iso power is a factory-fitted build option.
3 The cable screen is AC-coupled to mains earth by 1 nF
(6 kV continuous rating).
4 Connected to Common except in older ECG 1902s having
the right-leg drive option fitted.
Note: wire colours
& socket drawings
Isolation input
6-pin DIN socket
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