Atec 2302, 2306D User Manual
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Battery 2302/2306
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2302
2306, 2306-PJ
• Ultrafast response to transient
load currents
• Choice of single- or dual-
channel supplies
• Optimized for development
and testing of battery-powered
devices
• Variable output resistance
for simulating battery response
(U.S. Patent No. 6,204,647)
• Pulse peak, average, and
baseline current measurements
• 100nA DC current sensitivity
• Current step measure function
• Sink up to 3A
• Open sense lead detection
• Built-in digital voltmeter
SERVICES AVAILABLE
2302-3Y-EW 1-year factory warranty extended to 3 years
from date of shipment
2306-3Y-EW 1-year factory warranty extended to 3 years
from date of shipment
2306-PJ-3Y-EW 1-year factory warranty extended to 3 years
from date of shipment
C/2302-3Y-ISO 3 (ISO-17025 accredited) calibrations within 3
years of purchase for Model 2302*
C/2306-3Y-ISO 3 (ISO-17025 accredited) calibrations within 3
years of purchase for Models 2306, 2306-P*
*Not available in all countries
Battery Simulator
Battery/Charger Simulators
The single-channel Model 2302 Battery
Simulator and dual-channel Model 2306 Battery/
Charger Simulator were designed specifically for
development and test applications of portable,
battery-operated products, such as cellular and
cordless telephones, mobile radios, and pagers.
These precision power supplies have ultrafast
transient response so they can have output
characteristics identical to actual batteries.
These supplies employ a unique variable output
resistance so the voltage output can emulate a
battery’s response (U.S. Patent No. 6,204,647).
They provide stable voltage outputs, even when
a device-under-test (DUT) makes the rapid transition from the standby (low current) state to the
RF transmission (high current) state. In addition,
they can monitor DUT power consumption by
meas uring both DC currents and pulse load currents. The Model 2302’s and the Model 2306’s
battery-simulator channel can be programmed
to operate like a discharged rechargeable battery, sinking current from a separate charger or from the
Model 2306’s charger- simulator channel.
Maximize Test Throughput with Accurate Battery Simulation
The battery-output channels of the Models 2302 and 2306 are designed to simulate the output
response of a battery. This capability, combined with their fast transient response, makes it possible
to power the device during testing in exactly the
same way as a battery will power the device
during actual use. The output resistance of the
Model 2302’s and the Model 2306’s battery channel can be programmed (with 10mΩ resolution)
over the range from 0Ω to 1Ω so that the output resistance can be set to the same level as the
output resistance of the battery that powers the
device. See Figure 1.
Portable wireless devices make great demands
on their battery power sources. The battery must
source load currents that can jump virtually
instantaneously from a standby current level
(100–300mA) to a full-power RF transmission
current level (1–3A). In other words, the load
current on the battery can increase rapidly by
a factor of 700–1000%. As a result, the battery
voltage drops by an amount equal to the value
of the current change multiplied by the battery’s
internal resistance. The Models 2302 and 2306
power supplies enable test systems to duplicate
this voltage drop by programming their output
resistance to be equivalent to that of the battery
that will power the device. This allows wireless device manufacturers to test their products
under the same power conditions that they will
encounter in actual use. (See Figure 2.)
Figure 1. Simplified schematic of a battery
and the 2302/2306.
ACCESSORIES AVAILABLE
CABLES
7007-1 Shielded IEEE-488 Cable, 1m (3.3 f t)
7007-2 Shielded IEEE-488 Cable, 2m (6.6 f t)
SC-182 Low-Inductance Coax ial Cable (42nH/f t)
RACK MOUNT KITS
4288-1 Single Fi xed Rack Mount Kit
4288-2 Dual Fi xed Rack Mount Kit
IEEE-488 INTERFACES
KPCI- 488LPA IEEE- 488 Interface/Control ler for the PCI Bus
KPXI-488 IEEE- 488 Interface Board for the PXI Bus
KUSB- 488A IEEE- 488 USB-to- GPIB Interface Adapter
Fast transient response power supplies
1.888.KEITHLEY
www.keithley.com
(U.S. only)
A GREATER MEASURE OF CONFIDENCE
SPECIALIZED POWER SUPPLIES
High current level
Trigger level
Average current level
High
Time
Low current level
Low Time
Average Time
(out to 60s with long integration)
2302
Battery Simulator
2306, 2306-PJ
Ordering Information
2302 Battery Simulator
2306 Dual-Channel Battery/
2306-PJ Dual-Channel Battery/
Accessories Supplied
User and service manuals,
CS-846 output connectors
mating terminal
Conventional Power Supplies
and Wireless Device Testing
During production testing, supplying
power to a device that undergoes large,
instantaneous load current changes can be
extremely difficult. Changes like this force
a conventional power supply’s output voltage to fall instantaneously. When the power
supply’s control circuitry senses the error
Fast transient response power supplies
condition (the difference in voltage between
the programmed level and the actual
level), it attempts to correct or restore the
voltage to the programmed level. During
this time, the voltage will fall or droop
substantially, with the amount of the droop
depending on the size of the load current
change. The recovery time depends on the
transient response of the power supply’s
control loop. Conventional power supplies
have transient voltage drops of >1V when
confronted with load current changes of
up to 1000%, and take up to a millisecond
to recover to the programmed voltage. For
portable devices such as cellular phones
that operate at full power for only short
intervals, the full power event is over before
the conventional power supply can recover.
For example, a cellular phone designed to
the GSM cellular phone standard transmits
and receives information in 576µs pulses. If
the power supply used to test these types of
phones cannot recover quickly enough, the
performance of the phone during testing
will be compromised by the power supply.
If the power supply voltage drops below the
threshold of the phone’s low battery detection circuitry for long enough, then the
phone will turn off during testing, giving a
false indication of a failed device.
1.888.KEITHLEY
SPECIALIZED POWER SUPPLIES
www.keithley.com
Charger Simulator
Charger Simulator
with 500mA Range
(U.S. only)
Battery/Charger Simulators
Figure 2. Comparison of the voltage outputs of a lithium-ion battery (with an internal resistance of
260mΩ) and the Model 2306’s battery channel (programmed with an output resistance of 260mΩ )
when powering a cellular telephone as it makes the transition from standby mode to transmit mode.
In response to large load changes, the Model
2302 and the battery channel of the Model 2306
have transient voltage droops of less than 100mV
and transient recovery times of less than 60µs,
even when the test leads between the power
supply and the DUT are long. This fast transient
response, combined with the supplies’ variable output resistance, allows engineers to test
their portable products under the most realistic
operating conditions and eliminate false failures
due to conventional power supplies with slow
response times. (See the sidebar titled “Conventional Power Supplies and Wireless Device
Testing.”) These supplies also eliminate the large
stabilizing capacitors needed at the DUT to compensate for the large droop that occurs when
testing with conventional power supplies. By
varying the output resistance, which can be done
while the output is turned on, test engineers can
simulate the operation of different battery types,
as well as batteries nearing the end of their
useful lives.
The Models 2302 and 2306 ensure maximum
production throughput when testing portable
Figure 3. Built-in pulse current measurement functions allow test engineers to measure peak,
average, and baseline load currents.
A GREATER MEASURE OF CONFIDENCE
devices by minimizing false failures, minimizing
the number of test setups by performing multiple tests with the same power supply, and minimizing test fixture complexity by eliminating the
need for voltage-stabilizing capacitors.
Measure Load Currents for
Power Consumption Verification
or Analysis
As manufacturers of portable devices strive to
extend their products’ battery life, measuring
load currents accurately has become increasingly
essential in both design and production test in
order to ensure the product meets its demanding
specifications. Comprehensive testing of these
devices requires measuring peak currents, average currents, and baseline currents in various
operation modes. When testing these devices,
these measurements are complicated by the pulsating nature of load currents, such as the transmit and receive load currents of digital cellular
phones. The Models 2302 and 2306 can measure
the peak and average currents of pulses as short
as 60µs and as long as 833ms. (See Figure 3.)
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Trigger Levels
Load Currents
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Battery Channel Charger Channel
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charger
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battery
Battery
Terminals
Charger
Terminals
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II
DVM
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–5V to +30V DC
RI Sense
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2302
Battery Simulator
2306, 2306-PJ
Battery/Charger Simulators
Measure Long-Period Waveform Currents
For pulse trains with periods longer than 850ms, the Models 2302 and
2306 offer a unique, long integration current measurement mode. This
mode can provide an average measurement of a current waveform from
850ms up to 60 seconds long.
Measure Low Currents Accurately
The Models 2302 and 2306 are based on Keithley’s expertise in low current
measurement technologies, so they’re well-suited for making fast, accurate
measurements of sleep and standby mode currents. With 100nA resolution
and 0.2% basic accuracy, they provide the precision needed to monitor the
low sleep mode currents of both today’s battery-operated products and
tomorrow’s.
Verify Load Currents in All Operating States
The Models 2302 and 2306 employ a unique pulse current step function
for measuring the load current at each level of a device’s operational
states. (See Figure 4.) For example, if a cellular phone is ramped up and
down through as many as 20 discrete power consumption states, the
Models 2302 and 2306 can measure the load currents in synchronization
with the current steps. This capability allows a test engineer to verify
performance at each operational state and simultaneously acquire power
consumption information. The fast current measure capability is another
way the Models 2302 and 2306 power supplies save test time and production costs.
Figure 5. For charger control circuit testing applications, the Model
2306 and 2306-PJ can provide the functions of both a charger-simulating source and a discharged battery simulator.
the output voltage does not change from the programmed level, which
could cause production devices to be improperly calibrated, the user can
set high and low limits around the desired voltage level.
Independent Digital Voltmeter Inputs
Many programmable power supplies offer output readback capabilities, but
the Model 2302 and 2306 also offer DVM inputs. Both instruments allow
measuring signals from –5V to +30V DC anywhere in the test system with
the same rated accuracy as the voltage readback. The Model 2306 has two
sets of DVM inputs; the Model 2302 has one. The DVMs and the power
sources can operate simultaneously. For many applications, these built-in
DVMs eliminate the expense and space required to add a separate voltage
measurement instrument.
Fast transient response power supplies
Figure 4. These power supplies can obtain a load current profile
synchronized to the transitions of a DUT as it is stepped through its
operating states.
Simulate a Discharged Battery for Charger Testing
The Models 2302 and 2306 can sink up to 3A continuously, just like
an electronic load. This allows these supplies to simulate a discharged
rechargeable battery for use in testing the performance of battery chargers
or battery charger control circuitry.
The Model 2306 Battery/Charger Simulator combines the functionality of
both the charging current source (the charger channel) and the current
sinking to simulate the recharging of a discharged battery (the battery
channel) in a single enclosure. (See Figure 5.)
Open-Sense Lead Detection
The Model 2302 and 2306 have an automatic open–sense lead detection
capability, which indicates if there is a broken remote sense lead or an
open connection from a remote sense lead to the test fixture. To ensure
1.888.KEITHLEY
www.keithley.com
(U.S. only)
Figure 6. Model 2302 and Model 2306 Battery Channel Block Diagram.
The Model 2306 charger channel is identical except it does not have
the variable output resistance.
SPECIALIZED POWER SUPPLIES
A GREATER MEASURE OF CONFIDENCE
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