Product Manual

291, 292, 294
Users Manual
shc0003f.gif
Figure 1-1. Mains transformer connections
5. To comply with safety standard requirements the operating voltage marked on the
rear panel must be changed to clearly show the new voltage setting.
6. Change the fuse to one of the correct rating; see below.
2- and 4-channel instruments models 292 and 294
These instruments have a universal input range and will operate from a nominal 100 V,
115 V or 230 V mains supply without adjustment. Check that the local supply meets the
AC input requirement given in the specification.
Fuse
Ensure that the correct mains fuse is fitted for the set operating voltage. The correct
mains fuse types are:
230V operation: 100V or 115V operation:
single-channel instrument: 500 mA (T) 250 V HRC 1 A (T) 250 V HRC
2- and 4-channel instruments: 2 A (T) 250 V HRC 2 A (T) 250 V HRC
To replace the fuse, disconnect the mains lead from the inlet socket and withdraw the
fuse drawer below the socket pins. Change the fuse and replace the drawer.
The use of makeshift fuses or short-circuiting of the fuse holder is prohibited.
Mains Lead
When a three core mains lead with bare ends is provided it should be connected as
follows:
Brown Mains Live
Blue Mains Neutral
Green / Yellow Mains Earth
Warning
To avoid the possibility of electric shock:
This instrument must be earthed.
Any interruption of the mains earth conductor inside or
outside the instrument will make the instrument
dangerous. Intentional interruption is prohibited. The
protective action must not be negated by the use of an
extension cord without a protective conductor.
A-2