2303, 2304a
High Speed Power Supplies
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, wire-
less communication devices such as cellular
phones that undergo substantial load changes
for very short time intervals . These power sup-
plies 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 charac-
teristics 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-oper-
ated 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
designed to simulate the current drive capacity
Model 2303 or 2304a rear panel
of a battery . The power supplies simulate a bat-
tery’s response during a large load change by minimizing the maximum drop in voltage and recover-
ing 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 bat-
tery’s voltage will decrease by the value of the voltage drop across the battery’s low internal resist-
ance, 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
quickly enough, the performance of the device-
500mV/Div.
under-test will be compromised by the power
Power Supply Voltage
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 .
GND
0.5 A/Div
Fast transient response power supplies
•
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
500mV/Div.
Power Supply
Voltage
GND
0.5 A/Div
GSM Phone Current
100µs/Div.
GSM Phone Current
100µs/Div.
Typical Power supply. Transient response
with 4.5m (15 ft) of cable and 1W/lead
between source and GsM phone load.
Keithley’s High speed Power supply. Transient
response with 4.5m (15 ft) of cable and 1W/
lead between source and GsM phone load.
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 way, the power supplies ensure maximum
production throughput when testing portable
devices .
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A Greater Measure of Confidence
DC POWER SUPPLIES
Fast transient response power supplies
2303, 2304a
High Speed Power Supplies
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 criti-
cal . 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 meas-
urement 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 measurement
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 electron-
ic 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 oper-
ated remotely from the more accessible location .
aCCEssorIEs aVaIlablE
2304-DISP
CS-846
CablEs
7007-1
7007-2
SC-182
Remote Display
Mating Output Connector
Shielded IEEE-488 Cable, 1m (3 .3 ft)
Shielded IEEE-488 Cable, 2m (6 .6 ft)
Low-Inductance Coaxial Cable (42nH/ft)
ordering Information
2304a
2303
High speed Precision
readback Power
supply (100W)
High speed Precision
readback Power
supply (45W)
High speed Precision
readback Power supply
(45W, 500ma range
replaces 5ma range)
Fast transient response power supplies
2303-PJ
accessories supplied
user and service manuals,
Cs-846 output connectors
mating terminal
+
V
out
-
+
V
in
DVM
0–20V DC
-
Model 2303/2304a block Diagram showing
DC DVM measurement capability
The Models 2303/2304a perform a continu-
ous integration to make peak, average, and
baseline measurements on complex load
current waveforms. Integration times can be
programmed with 33.3µs resolution.
raCK MouNT KITs
4288-1
Single Fixed Rack Mount Kit
4288-2
Dual Fixed Rack Mount Kit
IEEE-488 INTErfaCEs
KPCI-488LPA
IEEE-488 Interface/Controller for the PCI Bus
KUSB-488B
IEEE-488 USB-to-GPIB Interface Adapter
DC POWER SUPPLIES
Trigger
Level
i
High
Average
t
33.3µs is the
narrowest (shortest)
time interval
Low
sErVICEs aVaIlablE
2303-3Y-EW
1-year factory warranty extended to 3 years
from date of shipment
2303-PJ-3Y-EW 1-year factory warranty extended to 3 years
from date of shipment
2304A-3Y-EW
1-year factory warranty extended to 3 years
from date of shipment
C/2303-3Y-ISO 3 (ISO-17025 accredited) calibrations within 3
years of purchase for Models 2303, 2303-PJ*
C/2304A-3Y-ISO 3 (ISO-17025 accredited) calibrations within 3
years of purchase for Model 2304A*
*Not available in all countries
I
Low
= i dt
High
Average
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(U.S. only)
www.keithley.com
A Greater Measure of Confidence
Fast transient response power supplies
2303, 2303-PJ
2303, 2304a
High Speed Power Supplies
DC General
MEASUREMENT TIME CHOICES:
0 .01 to 10 PLC
7
, in 0 .01PLC steps .
AVERAGE READINGS:
1 to 10 .
READING TIME
1, 8, 9
:
31ms, typical .
DC Voltage output (2 Years, 23°C ± 5°C)
OUTPUT VOLTAGE:
0 to +15V DC .
OUTPUT ACCURACy:
±(0 .05% + 10mV) .
PROGRAMMING RESOLUTION:
5mV .
READBACK ACCURACy
1
:
±(0 .05% + 3mV) .
READBACK RESOLUTION:
1mV .
OUTPUT VOLTAGE SETTLING TIME:
5ms to within stated accuracy .
LOAD REGULATION:
0 .01% + 2mV .
LINE REGULATION:
0 .5mV .
STABILITy
2
:
0 .01% + 0 .5mV .
TRANSIENT RESPONSE TO 1000% LOAD CHANGE:
Transient Recovery Time
3,4
:
<40µs to within 100mV of previous level .
<80µs to within 20mV of previous level .
Transient Voltage Drop:
<100mV, typical .
3
<200mV, typical .
4
RIPPLE AND NOISE (20Hz to 20MHz):
3mV rms/8mV p-p, typical .
REMOTE SENSE:
Automatic 1V max . drop in each lead . Add 2mV to the voltage load regulation
specification for each 1V change in the negative output lead due to load current change .
Pulse Current Measurement operation
TRIGGER LEVEL:
2303:
5mA to 5A, in 5mA steps .
2303-Pj: 5A Range:
0mA to 5A, in 5mA steps .
500mA Range:
0mA to 500mA, in 0 .5mA steps .
TRIGGER DELAy:
0 to 100ms, in 10µs steps .
INTERNAL TRIGGER DELAy:
25µs .
HIGH/LOW/AVERAGE MODE:
Measurement Aperture Settings:
33 .3µs to 833ms, in 33 .3µs steps .
Average Readings:
1 to 100 .
BURST MODE:
Measurement Aperture:
33 .3µs .
Conversion Rate:
3600/second, typical .
Number of Samples:
1 to 5000 .
Transfer Samples Across IEEE Bus in Binary Mode:
4800 bytes/second, typical .
LONG INTEGRATION MODE: Measurement Time
6
:
850ms (840ms) to 60 seconds in 16 .7ms
(20ms) steps .
Model 2303, 2303-PJ specifications
DC Current (2 Years, 23°C ± 5°C)
OUTPUT CURRENT:
0–9V: 5A max . >9V–15V: 3A max . (not intended to be operated in parallel) .
SOURCE COMPLIANCE ACCURACy:
±(0 .16% + 5mA)
5 .
PROGRAMMED SOURCE COMPLIANCE RESOLUTION:
1 .25mA .
READBACK ACCURACy
5A range:
±(0 .2% + 400µA) .
5mA range:
±(0 .2% + 1µA) .
2303
1
:
2303-Pj
1
: 5A range:
±(0 .2% + 400µA) .
500mA range:
±(0 .2% + 40µA) .
READBACK RESOLUTION
2303:
5A range:
100µA .
5mA range:
0 .1µA .
2303-Pj: 5A range:
100µA .
500mA range:
10µA .
CURRENT SINK CAPACITy:
0–5V: 2A max . 5V–15V: Derate 0 .1 A per volt above 5V .
LOAD REGULATION:
0 .01% + 1mA .
LINE REGULATION:
0 .5mA .
STABILITy
4
:
0 .01% + 50µA .
GENEral
ISOLATION (low-earth):
22V DC max .
PROGRAMMING:
IEEE-488 .2 (SCPI) .
USER-DEFINABLE POWER-UP STATES:
5 .
REAR PANEL CONNECTOR:
8-position quick disconnect terminal block for output (4), sense
(2), and DVM (2) .
TEMPERATURE COEFFICIENT (outside 23°C ±5°C):
Derate accuracy specification by (0 .1
×
specification)/°C .
OPERATING TEMPERATURE:
0° to 35°C (Full power) .
0° to 50°C (Derate to 70%) .
STORAGE TEMPERATURE:
–20° to 70°C .
HUMIDITy:
<80% @ 35°C non-condensing .
POWER CONSUMPTION:
150VA max .
REMOTE DISPLAy/KEyPAD OPTION:
Disables standard front panel .
DIMENSIONS:
89mm high
×
213mm wide
×
360mm deep (3½ in
×
8½ in
×
14
3
⁄
16
in) .
SHIPPING WEIGHT:
5 .4kg (12 lbs) .
INPUT POWER:
100V–120VAC/220–240VAC, 50 or 60Hz (auto detected at power-up) .
EMC:
Conforms with European Union Directive directive 89/336/EEC EN 55011, EN 50082-1,
EN 61000-3-2, and 61000-3-3, FCC part 15 class B .
SAFETy:
Conforms with European Union Directive 73/23/EEC EN 61010-1, UL 3111-1 .
AC LINE LEAKAGE CURRENT:
450µA @ 110VAC, typ .; 600µA @ 220VAC, typ .
RELAy CONTROL jACK:
1-channel, sink 150mA max ., 15V max . 5V output, 100mA max ., also
available on jack . Accepts 0 .173 in Bantam-type plug (CS-1003-1) .
Digital Voltmeter Input (2 Years, 23°C ± 5°C)
INPUT VOLTAGE RANGE:
0 to +20V DC .
INPUT IMPEDANCE:
10
10
W
typical .
MAXIMUM VOLTAGE (either input terminal) WITH RESPECT TO OUTPUT LOW:
–3V, +22V .
READING ACCURACy
1
:
±(0 .05% + 3mV) .
READING RESOLUTION:
1mV .
NoTEs
1
2
3
4
5
6
7
8
9
1.888.KEITHLEY
(U.S. only)
www.keithley.com
A Greater Measure of Confidence
DC POWER SUPPLIES
PLC = 1 .00 .
Following 15 minute warm-up, the change in output over 8 hours under ambient temperature, constant load,
and line operating conditions .
Remote sense, at output terminals, 1000% load change; typical .
Remote sense, with 4 .5m (15 ft) of 16 gauge wire and 1W resistance in each source lead to simulate typical test
environment, up to 1 .5A load change .
Minimum current in constant current mode is 6mA .
60Hz (50Hz) .
PLC = Power Line Cycle . 1PLC = 16 .7ms for 60Hz operation, 20ms for 50Hz operation .
Display off .
Speed includes measurement and binary data transfer out of GPIB .
Model 2303, 2303-PJ specifications
2304a
High Speed Power Supply
DC General
MEASUREMENT TIME CHOICES:
0 .01 to 10 PLC
7
, in 0 .01PLC steps .
AVERAGE READINGS:
1 to 10 .
READING TIME
1, 8, 9
:
31ms, typical .
DC Voltage output (1 Year, 23°C ± 5°C)
OUTPUT VOLTAGE:
0 to +20V DC (for Normal Output Response) .
0 to +15V DC (for Enhanced Output Response) .
OUTPUT ACCURACy:
±(0 .05% + 10mV) .
PROGRAMMING RESOLUTION:
5mV .
READBACK ACCURACy
1
:
±(0 .05% + 10mV) .
READBACK RESOLUTION:
1mV .
OUTPUT VOLTAGE SETTLING TIME:
5ms to within stated accuracy .
LOAD REGULATION:
0 .01% + 2mV .
LINE REGULATION:
0 .5mV .
STABILITy
2
:
0 .01% + 0 .5mV .
TRANSIENT RESPONSE TO 1000% LOAD CHANGE:
NORMAL MODE:
<50µs to within 100mV of previous level .
Transient Recovery Time
3
:
<100µs to within 20mV of previous level .
ENHANCED MODE:
Transient Recovery Time
3,4
:
<40µs to within 100mV of previous level .
<80µs to within 20mV of previous level .
Transient Voltage Drop:
<100mV, typical .
3
<200mV, typical .
4
REMOTE SENSE:
Automatic, 2V max . drop in each lead . Add 2mV to the voltage load regulation
specification for each 1V change in the negative output lead due to load current change .
PulsE CurrENT MEasurEMENT oPEraTIoN
TRIGGER LEVEL:
5mA to 5A, in 5mA steps .
TRIGGER DELAy:
0 to 100ms, in 10µs steps .
INTERNAL TRIGGER DELAy:
25µs .
HIGH/LOW/AVERAGE MODE:
Measurement Aperture Settings:
33 .3µs to 833ms, in 33 .3µs steps .
Average Readings:
1 to 100 .
BURST MODE:
Measurement Aperture:
33 .3µs .
Conversion Rate:
3600/second, typical .
Number of Samples:
1 to 5000 .
Transfer Samples Across IEEE Bus in Binary Mode:
4800 bytes/second, typical .
LONG INTEGRATION MODE
11
: Measurement Time:
850ms (840ms) to 60 seconds in 16 .7ms
(20ms) steps .
Model 2304A specifications
GENEral
ISOLATION (low-earth):
22V DC max .
PROGRAMMING:
IEEE-488 .2 (SCPI) .
USER-DEFINABLE POWER-UP STATES:
5 .
REAR PANEL CONNECTOR:
8-position quick disconnect terminal block for output (4), sense
(2), and DVM (2) .
RELAy CONTROL jACK:
2-channel, sink 150mA max ., 15V max . Accepts 0 .173 in . Bantam-
type plug (CS-1003-1) .
TEMPERATURE COEFFICIENT (outside 23°C ±5°C):
Derate accuracy specification by (0 .1
×
specification)/°C .
OPERATING TEMPERATURE:
0° to 50°C (50W
10
normal response, 25W
10
enhanced response) .
0° to 35°C (100W
10
normal response, 75W
10
enhanced response) .
STORAGE TEMPERATURE:
–20° to 70°C .
HUMIDITy:
<80% @ 35°C non-condensing .
POWER CONSUMPTION:
200VA max .
REMOTE DISPLAy/KEyPAD OPTION:
Disables standard front panel .
DIMENSIONS:
89mm high
×
213mm wide
×
360mm deep (3½ in
×
8½ in
×
14
3
⁄
16
in) .
SHIPPING WEIGHT:
5 .4kg (12 lbs) .
INPUT POWER:
100V–240V AC, 50 or 60Hz (auto detected at power-up) .
EMC:
Conforms with European Union Directive directive 89/336/EEC EN 55011, EN 50082-1,
EN 61000-3-2, and 61000-3-3, FCC part 15 class B .
SAFETy:
Conforms with European Union Directive 73/23/EEC EN 61010-1 .
DC Current (1 Year, 23°C ± 5°C)
OUTPUT CURRENT:
5A max . (not intended to be operated in parallel) .
COMPLIANCE ACCURACy:
±(0 .16% + 5mA)
5 .
PROGRAMMED COMPLIANCE RESOLUTION:
1 .25mA .
READBACK ACCURACy
1
5A range:
±(0 .2% + 1mA) .
5mA range:
±(0 .2% + 1µA) .
READBACK RESOLUTION
5A range:
100µA .
5mA range:
0 .1µA .
CURRENT SINK CAPACITy:
3A max . (for Normal Output Response) .
1A
6
(for Enhanced Output Response) .
LOAD REGULATION:
0 .01% + 1mA .
LINE REGULATION:
0 .5mA .
STABILITy
4
:
0 .01% + 50µA .
Digital Voltmeter Input (1 Year, 23°C ± 5°C)
INPUT VOLTAGE RANGE:
0 to +20V DC .
INPUT IMPEDANCE:
10
10
W
typical .
MAXIMUM VOLTAGE (either input terminal) WITH RESPECT TO OUTPUT LOW:
–3V, +22V .
READING ACCURACy
1
:
±(0 .05% + 10mV) .
READING RESOLUTION:
1mV .
NoTEs
DC POWER SUPPLIES
PLC = 1 .00 .
Following 15 minute warm-up, the change in output over 8 hours under ambient temperature, constant load,
and line operating conditions .
3
Remote sense, at output terminals, 1000% load change; typical .
4
Remote sense, with 4 .5m (15 ft) of 16 gauge wire and 1W resistance in each lead to simulate typical test
environment, up to 1 .5A load change .
5
Minimum current in constant current mode is 6mA .
6
15W typical . 0°–35°C . Derate 1W/°C up to 50°C .
7
PLC = Power Line Cycle . 1PLC = 16 .7ms for 60Hz operation, 20ms for 50Hz operation .
8
Display off .
9
Speed includes measurement and binary data transfer out of GPIB .
10
Max . continuous .
11
60Hz (50Hz) .
1
2
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(U.S. only)
www.keithley.com
A Greater Measure of Confidence
Model 2304A specifications
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