Operating Controls - Aim TTi LD300 Fonctionnement

This section of the manual is a brief introduction to the controls of the instrument and is intended
to be read before using the load for the first time.
In this manual, front panel controls and connections are shown in capitals, e.g. LEVEL
CONTROL.
Switching On, Load Enable On/Off
The line POWER (
check that the line operating voltage of the unit (marked on the rear panel) is suitable for the local
supply and that the INPUT ENABLE switch is in the released (Off) position.
Switch the power on (
Caution: If, while the load is enabled (the INPUT ENABLE switch is depressed), the line power
is disconnected and then re-connected, the instrument will restart and conduct load current
(unless a transient condition causes the fault latch to trip).
Metering
The two 4-digit meters have multiple functions depending on the setting of the METERS switch at
top right of the panel. The following combinations are available:
WATTS & OHMS
The load power and the equivalent resistance are displayed. These values are calculated from
the present measured values of voltage and current.
VOLTS & AMPS
The present measured values of voltage and current are displayed.
LEVEL A & LEVEL B
The settings of the two LEVEL controls are displayed. The measurement units, which depend
upon the selected operating mode, are indicated above the readout.
FREQUENCY & DUTY CYCLE
The left meter displays the frequency of the internal oscillator (in Hz or kHz) and the right meter
shows the percentage of each cycle that LEVEL B is active.
SLEW RATE & DROPOUT VOLTAGE
The left meter shows the slew rate setting. The measurement unit, which depends on the
selected operating mode, is indicated above the readout and is either per-millisecond or
per-second as indicated by a second annunciator.
The right meter shows the dropout voltage setting (below which the load will cease to conduct).
This will always be zero in Constant Voltage mode.
Load Mode Switch
The LOAD MODE switch selects the operating mode and range.
Level A and Level B Controls
The two 10-turn controls marked LEVEL A and LEVEL B set the two operating levels, which can
be selected by the LEVEL CONTROL switch or the transient signal.
) switch is at the bottom left of the front panel. Before switching on (
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) ; the fan should be heard to start and the meter displays should light.

Operating Controls

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