Installation 1250 Frequency Response Analyzer
2-4 CWB / 1250_Op / Issue 9A
2.3 CONNECTING THE AC MAINS
2.3.1 SAFETY PRECAUTIONS: EARTHING
For reasons of safety an earth connection is essential whenever measurement and
control circuits are connected, even if the 1250 is switched off. Earthing is achieved by
connecting the 1250 to a mains outlet, or other suitable earthing point. This earth
should be capable of carrying 25A and conform to the regulations in 'British Standard
Code of Practice CP1013 1965. Earthing'.
2.3.2 PROCEDURE
The 1250 is powered from 115V or 23OV ac mains. Before connecting the supply:
1. Ensure that the mains voltage selector switch on the rear panel is set at 115V or
230V as appropriate. Also on the rear panel, check that the mains fuse rating is
correct: 2A SLO BLO for 115V. 1A SLO BLO for 230V.
2. Ensure that the Power On/Off switch in the bottom left-hand corner of the Front
Panel is Off.
3. Connect the mains lead.
An ac supply cable, complete with a mating connector socket for the IEC plug on the
1250, is supplied. This cable should be connected to the user's ac supply in accordance
with the following colour code:
BROWN : LINE
BLUE : NEUTRAL
GREEN/YELLOW : EARTH
If the user already has available a supply cable terminated with an IEC socket, then this
can be plugged directly into ac supply plug on the 1250. It should be ensured. however,
that the socket is correctly wired, as shown in Fig. 2. 1.
Figure 2.1 - IEC power socket connections
4. Press the Power switch to On.
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