Keithley 2302 Instruction Manual page 324

E-6 Applications Guide
NOTE
Two methods are used to determine the impedance value of the cell or battery pack. The first
method uses data from the battery manufacturer or another source and is simply entered into the
Model 2306 from the front panel or over the GPIB bus. The second method involves a simple
series of measurements as follows.
Figure E-6
Li ion voltage drop during the transmit portion of the pulse
NOTE
Figure E-6
battery. Using the pulse current mode of the battery channel, the measured current during the
transmit portion of the data frame is I
I = 0.082A. To estimate R
L
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Figure E-5 contains the effect of the variable output impedance control of the
Model 2306 on the current and voltage performance of a GSM handset.
Figure E-6 shows the voltage drop during the transmit portion of the pulse of a GSM
phone with the supplied Li ion.
shows the transient voltage response at the battery terminals with the handset
from the measured voltage in
i
V V
H – L
≅
R
------------------- -
=
I I
i
–
H L
V H – V L = 0.348 V
= 1.536A and the idle portion of the data frame is
H
Figure
0.348V
Ω
0.239
---------------- -
=
1.454A
E-6, use: