Mains Operating Voltage and Frequency
Check that the instrument operating voltage and frequency marked on the rear panel are correct
for the local supply; these are factory set and cannot be changed by the user.
There are 6 combinations of supply voltage and frequency: 230V/50Hz, 230V/60Hz, 115V/50Hz,
115V/60Hz, 100V/50Hz and 100V/60Hz; the Specification section gives the operating range for
each version. To operate correctly the AC1000 requires an accurate and stable input frequency.
It is not designed to operate from portable generators or battery inverters and it will not function
when powered from a source that has a high impedance at 1kHz such as an isolating transformer
with a split bobbin.
The AC1000 does not function as an uninterruptable power supply (UPS), a transient suppressor,
a wideband noise filter, or a voltage stabilizer. It is intended to provide a clean supply to a load
being tested to the harmonics standard EN61000-3-2, assuming that the load has a reasonable
expectation of passing the requirements. Any load which has a repetitive peak current above the
10Apk rating of this unit is very unlikely to meet the requirements, and is outside the intended use
of the product.
Fuse
The AC fuse is located in the fuse drawer in the lower part of the IEC inlet connector. To change
the fuse remove the line cord and open the fuse drawer with a suitable tool.
The correct fuse type for all operating voltages is 20 x 5mm 5A(T) 250V HBC time-lag.
Make sure that only fuses with the required current rating and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuseholders are prohibited.
Mains Lead
Connect the instrument to the AC supply using the mains lead provided. Should a mains plug be
required for a different type of mains outlet socket, use a suitably rated and approved 3-core
mains lead set which is fitted with the required wall plug and an IEC60320 C13 connector for the
instrument end. This instrument requires a lead rated at 6A for all mains supply voltages.
Any interruption of the mains earth conductor inside or outside the instrument will make the
instrument dangerous. Intentional interruption is prohibited.
Ventilation, Protection and Audible Warnings
The AC1000 relies on forced air cooling via a fan and ventilation slots. Care should be taken to
avoid restricting the airflow around the fan and exit vents; adequate ventilation can usually be
achieved by leaving a 75mm gap around the unit.
The power source is thermally protected. If the load is too high for the ambient temperature the
correction circuit will be bypassed (i.e. switched to DIRECT, regardless of the setting of the
DIRECT/CORRECTED switch) and the buzzer will sound a continuous tone. When the unit has
cooled sufficiently it will automatically switch back to corrected mode but if the same overload
conditions are present then the unit will cycle safely between DIRECT and CORRECTED at a
rate dependent on the amount of overload.
The power source is fitted with a 5A(T) fuse at the inlet which additionally protects the unit against
high load currents and internal faults.
When the power source is first switched on ( POWER switch set to
tone for a few seconds until the correction circuit has stabilised. If the supply voltage falls below
the level at which the unit can successfully correct the input the buzzer again sounds a pulsed
tone.
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WARNING! THIS INSTRUMENT MUST BE EARTHED.
Installation
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) the buzzer sounds a pulsed