INSTALLATION
2-5
AC operation
Connecting to supply
The instrument is a Safety Class 1 product and therefore must be earthed. Use the supplied power
cord or an appropriate replacement. Make sure that the instrument is plugged into an outlet socket
with a protective earth contact.
Ensure that the AC supply is correctly connected to the POWER SUPPLY socket. For supplies in
the range 100−120 V and 210−240 V the PSU automatically selects the appropriate range. There
is no manual voltage range selection provided.
Disconnecting device
The detachable power cord is the instrument’s disconnecting device, but if the instrument is
integrated into a rack or system, an external power switch or circuit breaker may be required.
Whatever the disconnecting device, make sure that you can reach it easily and that it is accessible
at all times.
AC fuse
For the AC voltage range of 90 to 264 V the fuse rating is 2 A-T (time lag). The AC fuse is a
cartridge type measuring 20 mm x 5 mm.
The fuse-holder is integral with the rear panel 3-pin supply plug. For access to change the fuse,
use a screwdriver to lever out the holder.
Internal fuse
Note that there is an additional, non-operator-replaceable internal, fuse fitted in the switched mode
power supply (not applicable to instruments fitted with Option 2, DC operation, which have a
different power supply).
DC operation (Option 2)
Connecting to supply
Before connecting the instrument to a DC supply, for an instrument fitted with Option 2, check
that the DC supply is within the following range:
11 to 32 V
If, however, the DC supply is to provide a back-up for the AC supply, the following DC supply
range must be used:
18 to 32 V
DC fuse
For the DC voltage range of 11 to 32 V the fuse rating is T10AH250V. Fuses are cartridge type
measuring 20 mm × 5 mm.
DC supply cable
Connection is made to a 3-pin polarized plug on the instrument (see Fig. 2-1). Note that the
negative (−) connector is internally connected to the chassis of the instrument. A suitable lead is
available as a supplied accessory (see ‘Versions and Accessories’ at the end of Chapter 1).
Fig. 2-1 DC input socket showing connector polarity (viewed from rear of instrument)
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