Keithley Instruments 2304A Data Sheet

2303, 2304A High Speed Power Supplies

Power Supply

Voltage

100µs/Div.

0.5 A/Div

500mV/Div.

GSM Phone Current

GND

Power Supply Voltage

100µs/Div.

0.5 A/Div

500mV/Div.

GSM Phone Current

GND

• Optimized for battery-powered

device testing

• Ultra-fast transient response to

load changes

• 5A continuous output

• Pulse peak, average, and

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

•

Typical Power Supply

4.5m (15 ft) of cable and 1
source and GSM phone load.

ransient response with

. T

Ω/lead between

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 batter

y for

testing chargers and charger-control circuitry.

Output Capacity

5A

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. F

or 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
quickly enough, the performance of the device-

-test will be compromised by the power

under
supply. If the power supply voltage drops below
the threshold of the phone’s low-battery detec­tion circuitr

y for a sufficient amount of time, the
phone will turn off during testing, giving a false
indication of a failed device.

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

eithley’s High Speed P

K
response with 4.5m (1
1

Ω/lead between source and G

ower Supply

5 ft) of cable and

ransient

. T

SM phone load.

way, the power supplies ensure maximum pro­duction throughput when testing portable
devices.

Fast transient response power supplies

1.888.KEITHLEY (U.S. only)

www.keithley.com

A GR

TER M

EA

EASU

RE OF CONFIDENCE

CIALIZED POWER SUP P LIES
E

SP

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

DVM

+

-

+

-

V

out

V

in

0–20V DC

Ordering Information

2304A
High Speed Precision Readback

ower Supply (100W)

P
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

Fast transient response power supplies

F

ast 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 60

µs. 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 in 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 instr

ument
controls, so that the power supply can be oper
ated remotely from the more accessible location.

-

1.888.KEITHLEY (U.S. only)

SPECIALIZED POWER SUP PLIE S

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

-182

SC

RACK MOUNT KITS

4288-1 Single Fixed Rack Mount Kit
4288-2

ER

TH

O

2303-EW
2304-EW 1 Year Warranty Extension
2304A-EW 1 Year Warranty Extension
KPCI-488 IEEE-488 Interface/Controller for the PCI Bus
KUSB-488 IEEE-488.2 USB-to-GPIB Interface Adapter

estPoint Test Development Software

T

Shielded IEEE-488 Cable, 2m (6.6 ft)
Low-Inductance Coaxial Cable (42nH/ft)

arranty Extension

ear W

ack Mount Kit

Dual Fixed R

1 Y