2308 KEITHLEY, 2308 Datasheet - Page 3

• Manufacturer Part Number: 2308
• Description: 58T8428
• Manufacturer: KEITHLEY

Specifications of 2308

• No. Of Outputs: 2
• Output Voltage: 15V
• Output Voltage 2: 15V
• Output Current: 5A
• Output Current 2: 5A
• Load Regulation: 0.01%
• Length: 411mm
• Width: 213mm
• Height: 89mm
• Weight: 3.2kg
• Power Supply Output Type: Variable
• Power Rating: 50W

2308
ranges (5mA, 50mA, 500mA, and 5A) allows measuring load currents
with exceptional resolution and accuracy.
Measure sleep and standby currents with
the accuracy of integrating A/D technology
The Model 2308 is designed for fast and accurate measurements of devices
in low power modes such as the sleep, hibernate, or standby state. It can
resolve currents down to 100nA and measure them with 0.2% accuracy.
The Model 2308 uses an integrating A/D converter that continuously
acquires the signal rather than capturing discrete samples; this provides a
more accurate measurement than other A/D techniques. In addition, the
averaging effect built into integrating A/D converters reduces noise and
delivers highly stable current readings. You can measure low and high
currents at the same speed with no degradation in accuracy, so the Model
2308 is equally well-suited for the test line and the design lab.
Measure load currents from pulsed-output devices
Devices like GSM-, EDGE-, WLAN-, and WiMAX-based mobile phones gen-
erate pulsed outputs. Determining their total power consumption requires
measuring both the baseline current and the peak of the pulsed load
current. The Model 2308 can capture peak currents of pulses as short as
50µs and as long as 833ms. Programmable trigger levels allow controlled
capture of the pulse, then the Model 2308’s programmable measurement
delay and acquisition times make it easy to avoid rising edge transients so
the pulse peak can be measured accurately. The instrument can also meas-
ure the pulse baseline current and the pulse average load current.
A long integration current mode supports measuring pulse trains with
periods longer than 850ms. In this mode, the Model 2308 can measure
average current on a load current waveform with a period from 850ms to
60 seconds.
The Model 2308 can measure peak pulse currents, average currents,
and baseline currents.
Take multiple measurements on start-up sequences or
on current levels at different voltage operating levels
Need to analyze a device’s circuitry during the power-up phase as it transi-
tions from a sleep mode or an off-state? The Model 2308’s pulse step cur-
rent function has the speed needed to measure the load current start-up
levels in a single device start-up so that the measurements can be per-
formed in production without an increase in test time.
The pulse step current function also offers a fast way to determine load
currents of different operating states. For example, as source voltage levels
are varied over a device’s operating range, the corresponding operating
current levels can be measured without executing multiple commands for
High current level
Trigger level
Low current level
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(out to 60s with long integration)
High
Time
Average Time
(U.S. only)
Low Time
Portable Device Battery/Charger Simulator
A
With a single command, the Model 2308’s high speed pulse step
current function can quickly capture varying load current levels to
speed test throughput.
a significant time-savings when testing integrated circuits over their allow-
able range of Vcc levels.
Capture the complete load current waveform
Two built-in analog outputs help designers of device’s verify design perfor-
mance and ensure its current draw conforms to design specifications with-
out the need to connect any sensing circuitry in the power supply circuit.
Once these outputs are connected to an oscilloscope or a data acquisition
module, the load current waveform can be displayed or digitized and ana-
lyzed in a computer. When the Model 2308 is connected to a data acquisi-
tion module, the data acquisition module can sample the waveform at any
sampling rate to create a record of any length desired.
Test under realistic conditions with true battery simulation
When a portable battery-operated device transitions from one load current
level to another, the battery voltage supplying the current will drop by
the product of the change in current and the battery’s internal resistance.
During the load current pulse, the device must operate with a voltage
reduced by the battery’s internal resistance. The Model 2308 allows simu-
lating this resistance so its output is almost identical to a battery’s output,
allowing design or production test engineers to test devices or components
under realistic conditions. This patented
resistance to be programmed between 0W and 1W with 10mW resolution.
You can also decrease the voltage and increase the output resistance while
the output is on to simulate the discharge of the battery.
The Model 2308’s programmable output resistance (right) allows it to
simulate the output of a real battery (left), a capability conventional
power supplies do not have. The 2308 output is identical to the
battery’s response.
1. U.S. Patent Number 6,204,647 B1
G R E A T E R
(50mV/
(1A/
div)
div)
V
I
I
1
130mΩ Internal Resistance
I
Lithium Ion Battery with
2
M E A S U R E
Time
I
3
100µs/div
Trigger Levels
I
O F
4
C O N F I D E N C E
I
5
1
technique permits the output
Model 2308 with Output Resistance
Programmed to 130mΩ
Load Currents
I
Time
6
100µs/div
I
7
I
8