LD300 AIM-TTI INSTRUMENTS, LD300 Datasheet - Page 3

• Manufacturer Part Number: LD300
• Description: DC ELECTRONIC LOAD
• Manufacturer: AIM-TTI INSTRUMENTS

Specifications of LD300

• Voltage Measuring Range Ac: 0V To 80V
• Meter Display Type: LED
• Operating Temperature Range: +5°C To +40°C
• Lead Free Status / RoHS Status: na

Constant voltage mode is used
for load testing of constant cur-
rent power supplies. The unit
operates as a high power shunt
regulator.
Constant power mode simu-
lates a load whose power con-
sumption is independant of the
applied voltage. This is true of
many types of equipment that
incoporate switchmode regula-
tors.
This mode may be particularly
suitable for testing power
sources of portable devices
such as Lithium-ion batteries.
Constant current mode is used
for load testing of normal volt-
age-source power supplies
and for constant current dis-
charge testing of batteries.
This mode provides rapid mea-
surement of power source reg-
ulation (V/I characteristics).
Multiple modes of operation
CI, CR, CG, CV and CP modes
Constant
Constant
Constant
Voltage
Current
Power
transient generator, variable slew rate
Constant resistance mode
simulates a standard resistive
load by providing a current
drain proportional to voltage.
Settings are displayed in Ohms
or milli-Ohms.
Unlike fixed resistors or rheo-
stats, the load provides a pre-
cisely controllable resistance
with high power dissipation
over a wide value range.
Constant conductance (CG)
mode is also incorporated. As
well as showing settings in
amps per volt, this mode pro-
vides better resolution when
setting very low equivalent re-
sistance values.
Adjustable voltage
drop-out
Some power sources, such as
rechargeable batteries, can be
damaged if their output voltage
falls below a certain level.
The LD300 provides automatic
protection by incoprorating
fully variable voltage dropout
(CI, CR, CG and CP modes).
Resistive discharge
(conductance mode)
with voltage dropout.
Note that in CR mode
the load performs the
equation I = (V -Vd)/R
where Vd is the drop-
out voltage.
If the voltage applied to the
load falls below a preset level,
the load current is rapidly re-
duced to zero.
Conductance
Resistance
Constant
Constant
Transient generator and variable slew
The LD300 incorporates a full variable frequency, variable duty
cycle transient generator.
Switching between the two preset levels can be done at any fre-
quency between 0.1Hz and 10kHz.
The transient generator can be
used in all operating modes.
The rate of change between levels
(slew rate) is controllable over a
wide range.
Slew rate control applies to all changes of level including remote
control and manual changes between level A and level B.
A slow-start function can be selected for situations where latching
would otherwise occur at switch-on.
High resolution setting & measurement
The levels for each operating mode are set using high quality ten
turn potentiometers for both level A and level B.
Levels are displayed using four digit meters which provide resolu-
tion down to 1mA, 1mV and 1m .
Settings for slew rate, transient frequency, duty cycle and drop-
out voltage can also be displayed.
In measurement mode the meters have an accuracy of 0.1% for
voltage and 0.2% for current.
Remote control
The LD300 incorporates analogue remote control for all modes of
operation. When "external voltage" is selected the level becomes
linearly proportional to the voltage applied to the remote control in-
puts on the rear panel.
Any waveform can be used as the control voltage allowing com-
plex load conditions to be simulated using, for example, an arbi-
trary waveform generator.
Alternatively, a logic signal can be used to switch between levels.
When "external TTL" is selected, the level is switched between the
two preset levels in response to an external logic signal.
The remote control inputs have a wide common mode range al-
lowing the control voltage to be referenced independently of the
load terminal voltages.
Current waveform monitor
It is often important to be able to observe the load current wave-
form on an oscilloscope. The LD300 provides a calibrated monitor
output for this purpose as well as a sync output from the transient
generator.
The monitor output has several volts of compliance with respect to
the load input, thus allowing it to be connected to a grounded oscil-
loscope without current divertion.