2303, 2304A High Speed Power Supplies
• Optimized for battery-powered
device testing
• Ultra-fast transient response to
load changes
• 5A continuous output
• Pulse peak, average, and
Fast Transient Response Power Supplies
baseline current measurements
• 100nA DC current sensitivity
MODEL 2304A
• 100W output (20V @ 5A)
• Sinks up to 3A
MODEL 2303
• 45W output (15V @ 3A, 9V @ 5A)
• Sinks up to 2A
500mV/Div.
Power Supply
Voltage
0.5 A/Div
GND
GSM Phone Current
100µs/Div.
Typical Power Supply. Transient response with
4.5m (15 ft) of cable and 1Ω/lead between
source and GSM phone load.
The Model 2303/2304A Power Supplies provide
both voltage control and power consumption
monitoring for automated testing of portable,
battery-operated devices. These power supplies
are optimized for testing battery-operated, wireless communication devices such as cellular
phones that undergo substantial load changes
for very short time intervals. These power supplies exhibit outstanding voltage stability during
pulse load changes and can simultaneously
measure load currents, even if they are short
pulses. In addition, this family of power supplies
can sink current and, thus, take on the characteristics of a discharged, rechargeable battery for
testing chargers and charger-control circuitry.
5A Output Capacity
Both the 100W Model 2304A and the 45W Model
2303 can supply 5A (at 20V for the Model 2304A
and 9V for the Model 2303) to serve the peak
pulse loading requirements of battery-operated
devices. In both instruments, the maximum current of 5A can be delivered continuously. The
Model 2304A can supply up to 20V DC while the
Model 2303 can supply up to 15V.
Fast Response to Load Changes
Keithley’s High Speed Power Supplies are
Model 2303 or 2304A rear panel
designed to simulate the current drive capacity of
a battery. The power supplies simulate a battery’s
response during a large load change by minimizing the maximum drop in voltage and recovering to
within 100mV of the original voltage in 40µs or less.
When a portable device such as a cellular phone switches from standby mode to the full power mode
of operation, the current draw on the power supply can change by as much as 1000%. While a battery’s voltage will decrease by the value of the voltage drop across the battery’s low internal resistance, a conventional power supply will have a significant voltage drop (more than one volt) and take
milliseconds to recover to the original voltage level. For portable devices that operate at full power
only for short intervals, the full power event is over before a conventional power supply can recover.
For example, cellular phones designed in accordance with the GSM cellular phone standard transmit
and receive information in 576µs pulses. If the
power supply used to test them cannot recover
500mV/Div.
Power Supply Voltage
quickly enough, the performance of the device-
under-test will be compromised by the power
supply. If the power supply voltage drops below
the threshold of the phone’s low-battery detec-
tion circuitry for a sufficient amount of time, the
phone will turn off during testing, giving a false
indication of a failed device.
0.5 A/Div
GND
GSM Phone Current
100µs/Div.
The Models 2303/2304A’s fast transient response
to large load changes will enable test engineers
to test their portable products properly and
eliminate false failures due to conventional
power supplies with slow response times. In this
Keithley’s High Speed Power Supply. Transient
response with 4.5m (15 ft) of cable and
1Ω/lead between source and GSM phone load.
way, the power supplies ensure maximum pro-
duction throughput when testing portable
devices.
164
1.888.KEITHLEY (U.S. only)
SPECIALIZED POWER SUPPLIES
www.keithley.com
A GREATER MEASURE OF CONFIDENCE
Trigger
Level
33.3µs
High Low
Average
t
1
t
2
Low
High
Average
I = q(t)dt
t
1
t
2
2303, 2304A High Speed Power Supplies
Ordering Information
2304A
High Speed Precision Readback
Power Supply (100W)
2303
High Speed Precision Readback
Power Supply (45W)
2303-PJ
High Speed Precision Readback
Power Supply (45W, 500mA
range replaces 5mA range)
Extended warranty, service, and
calibration contracts are available
Accessories Supplied
User and service manuals,
CS-846 output connectors mating
terminal
+
V
out
-
+
V
in
DVM
0–20V DC
-
Fast Measurements for
Power Consumption Analysis
As manufacturers of portable devices strive to
extend battery life and the length of time
between recharges, power consumption has
become an important performance indicator.
Therefore, in production testing, accurate peak
power and average power measurements are critical. These measurements are complicated by the
fact that wireless telecommunication devices
draw full load current in short pulses. The Models 2303/2304A’s pulse readback measurement
mode makes it possible to capture peak and average values on pulses as short as 60µs. This allows
the power supply to power a device-under-test
.
and determine its current consumption to qualify
the device for its specified power consumption.
In addition to making measurements on short
pulses, the 2303/2304A power supplies can
measure a current pulse peak or a current pulse
train that is as long as 833ms. For random pulse
trains that have periods longer than 833ms, the
power supplies have a special long integration
mode that can make an average current measurement on up to 60s of data. To capture low
current pulses from very low power devices, the
Model 2303-PJ provides pulse measurement on
both the 5A and 500mA ranges.
Accurate Low Current Measurements
The Models 2303/2304A are well-suited for making fast, accurate measurements of sleep and
standby mode currents because they are based
on Keithley’s expertise in low current measure-
Model 2303/2304A
Block Diagram showing DC DVM measurement capability
ment technologies. With 100nA resolution, the
power supplies offer the precision needed to
monitor the low sleep mode currents in today’s
products and future products. They can also
measure these low currents with 0.2% basic
accuracy.
High Current Sinking Capacity
Keithley’s power supplies can act as an electronic load and sink as much as 3A (Model 2304A)
and 2A (Model 2303), so they can simulate a discharged rechargeable battery. Therefore, they
can be used to verify the performance of a
portable device’s charger. The power supplies’
current dissipation capacity allows them to test
even high-current fast chargers.
Independent Digital Voltmeter Inputs
While many programmable power supplies offer
output readback capabilities, Keithley’s power
supplies are the only instruments available that
also offer a set of DVM inputs. These inputs allow
the Model 2304A to measure signals from 0 to
+20V (0 to +15V for the Model 2303) anywhere
in the test system with the same rated accuracy as
the voltage readback. The DVM and the power
source can operate simultaneously. For many
applications, the power supplies’ built-in DVM
eliminates the expense and space that a separate
voltage measurement instrument would require.
Remote Display Option
If the Model 2303 or 2304A must be mounted in
a location in which the display is not readily visible, an optional Model 2304-DISP Display
Module can be mounted at a more convenient
point, then plugged into the power supply unit.
The display module also includes all instrument
controls, so that the power supply can be operated remotely from the more accessible location.
Fast Transient Response Power Supplies
1.888.KEITHLEY (U.S. only)
www.keithley.com
The Models 2303/
2304A perform
a continuous integration to make peak,
average, and baseline
measurements on
complex load current
waveforms. Integration times can be
programmed with
33.3µs resolution.
A GREATER MEASURE OF CONFIDENCE
ACCESSORIES AVAILABLE
2304-DISP Remote Display
CABLES
7007-1 Shielded IEEE-488 Cable, 1m (3.3 ft)
7007-2 Shielded IEEE-488 Cable, 2m (6.6 ft)
SC-182 Low-Inductance Coaxial Cable (42nH/ft)
RACK MOUNT KITS
4288-1 Single Fixed Rack Mount Kit
4288-2 Dual Fixed Rack Mount Kit
OTHER
2303-EW 1 Year Warranty Extension
2304-EW 1 Year Warranty Extension
2304A-EW 1 Year Warranty Extension
KPC-488.2 IEEE-488.2 Interface Card for the ISA Bus
KPCI-488 IEEE-488 Interface/Controller for the PCI Bus
KUSB-488 IEEE-488.2 USB-to-GPIB Interface Adapter
TestPoint Test Development Software
SPECIALIZED POWER SUPPLIES
165
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