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2.2.2 Power Requirements
This instrument requires a power source of either 100 - 120 volts AC ± 10%, 50/60 Hz single phase
or 200 - 240 volts AC ± 10%, 50/60 Hz single phase. Please check the rear panel to be sure the
proper switch setting is selected for your line voltage requirements before turning your
instrument on. For operation at 115 and 230 Volts AC use a 6.3A for SE 7430, SE 7440 and SE 7441.
The max. rated power is 700VA. Use a 15A for SE 7450 and SE 7452, 250VAC fuse. The max. rated
power is 1300VA.
Do not switch the line voltage selector switch located on the rear panel
while the instrument is on or operating. This may cause internal damage
and represents a safety risk to the operator.
2.2.3 Basic Connections
Power Cable
Before connecting power to this instrument, the protective ground (Earth)
terminals of this instrument must be connected to the protective
conductor of the line (mains) power cord. The main plug shall only be
inserted in a socket outlet (receptacle) provided with a protective ground (earth) contact. This
protective ground (earth) must not be defeated by the use of an extension cord without a
protective conductor (grounding).
The instrument is shipped with a three-wire power cable. When the cable is connected to an
appropriate AC power source, the cable will connect the chassis to earth ground. The type of
power cable shipped with each instrument depends on the country of destination.
Return Connection
The output power supplies of this instrument are referenced directly to
earth ground. Any conductor that completes a path between the high
voltage and earth ground will form a completed circuit.
When the instrument Return is grounded, any internal and external stray leakage will be
monitored due to currents that flow from High Voltage to earth ground (such as from HV to the
chassis of the instrument). This current is inherent and will cause errors when trying to monitor
very low leakage currents in the micoamp range.
2.2.4 Environmental Conditions
This instrument may be operated in environments with the following limits:
Temperature…………. 0° - 40° C
Relative humidity ……20 - 80%
Altitude ………………6,560 feet (2,000 meters)
Use insulation resistance function before, should be warmed-up 30 minutes.
Storage and Shipping Environment
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