Operation - Aim TTi AC1000 Manual De Instrucciones

Connections
With the POWER switch off (
provided.
With the LOAD POWER switch set to DIRECT, connect the load to the AC socket on the front
panel; the unit should have been supplied with a socket suitable for local appliance connectors.
If the load is being measured through a HA1600 Power and Harmonics Analyser, connect the
fixed LOAD POWER lead of the HA1600 to the front panel socket of the AC1000.
Switching On Supply Power
It is strongly recommended that the LOAD POWER switch on the AC1000 should be set to the
DIRECT position whenever the load is switched on or off. In this condition the correction circuit is
bypassed and the load is connected directly to the incoming AC line; this avoids the possibility of
any voltage or current surge associated with switching the load causing damage to the power
output amplifier.
With the LOAD POWER switch set to DIRECT, turn on the AC1000 by setting the POWER switch
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to ; this also supplies power to the load. When the power is first switched on, an internal relay
bypasses the correction circuit while it settles to the supply conditions, so the load receives power
from the uncorrected supply. The buzzer sounds a pulsed tone until the unit is ready to supply
corrected power. If a HA1600 is connected to the AC1000 it will also phase lock to the supply at
this time. The load should then be switched on with its own switch, allowing any current surge to
pass through the DIRECT connection of the AC1000.
Switching To CORRECTED Load Power
A few seconds after the POWER switch has been turned on (
indicating that the correction circuit has stabilised. The LOAD POWER switch may then be set to
CORRECTED, providing the load with a corrected supply which is harmonically pure. There is a
brief interruption of the AC supply to the load (<2ms) at switch-over; this, however, is well within
the minimum interruption period (10ms) that equipment must withstand to comply with other
aspects of EMC immunity, so should present no problem.
The LOAD POWER may be switched between DIRECT and CORRECTED as required, to see
the effect of the correction on the behaviour of the load.
Return the LOAD POWER switch to the DIRECT position before switching off the load. This is
particularly important with an inductive load, to minimise the risk of the voltage surge causing
damage to the unit.
Use with a Variac
If a Variac is to be used to make small adjustments to bring the actual output voltage to the
nominal value required by the measurement then the Variac may be connected to the power input
of the AC1000. It is important to ensure that at all times the Variac delivers a voltage within the
rated supply range of the AC1000 (see the Specification for the different versions available).
If larger variations of output voltage are required then the Variac (or a transformer) must be
connected between the output of the AC1000 and the load being tested. In this case it is
particularly important to ensure that the LOAD POWER switch is in the DIRECT position when the
power is initially switched on, as the Variac will take a substantial surge current at switch-on. After
the unit has stabilised the LOAD POWER switch may be set to CORRECTED and the Variac
adjusted as required. Note that the impedance of the Variac may re-introduce distortion on the
output waveform, depending on the characteristics of the load current waveform. The HA1600
load circuit input should be connected to the Variac output, and will verify the waveform quality.
Return the switch to the DIRECT position before switching the power off, as there may be a
voltage surge from the Variac.
), connect the AC1000 to the AC supply using the mains lead

Operation

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) the buzzer tone will cease,
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