2308-900-01 Rev. A / July 2008
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Section Topics
2-19
Model 2308 Portable Device Battery/Charger Simulator User’s Manual
Section 2: Basic Power Supply Operation
Measurement configuration
The NPLC RATE #2 and AVER READINGS #2 for DVM measurements can be checked or
changed from the menu (which is accessed by pressing the
MENU
key). Select Channel #2 by
pressing the or keys.
These two measurement configuration menu items are the same ones used for SINGLE V AND I
measurements (see
Measurement configuration
for details on NPLC rate and average readings).
SCPI programming - DVM
The commands to perform V AND I measurements on the charger channel (#2) are also used to
perform DVM measurements. These commands are documented in
Table 2-3
.
The “DVM measurements” programming example at the end of this section demonstrates how to
use these commands to measure the DVM input.
Sink operation
Either channel can sink current if its load is at a higher voltage then the channel’s output. This
enables a channel to simulate a discharged battery, and the second channel to simulate a charger
so that a device’s charger-control circuitry can be tested.
Figure 2-5
Charger Control Circuit Testing
Sink operation allows the power supply to be used as a constant current load. To function
as a constant current load, the power supply must be in compliance (current limit). When operating
as a sink, the power supply is dissipating power rather than sourcing it.
Figure 2-6
shows an
example of how the power supply can be made to operate as a sink. An external source, such as a
battery charger circuit, whose voltage is higher than the programmed power supply voltage, is
connected as shown. If the supply is operated in remote sense and
NOTE
Table 1-3
shows the menu structure. Rules to navigate the menu follow the
tables.
NOTE
For Channel 1 to simulate a discharged battery (by sinking current), and for
Channel 2 to simulate a charger, program the Channel 2 voltage to be greater
than the Channel 1 voltage.
▲
▲
Channel 1
DUT
Channel 2
Program V
chan2
> V
Chan1
to force Channel 1 to sink current
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