Basic Power Supply Operation 2-19
Measurement configuration
The NPLC RATE #1/#2 and AVER READINGS #1/#2 for DVM measurements can be
checked or changed from the menu (which is accessed by pressing the MENU key). The “#1”
(battery channel active) or “#2” (charger channel active) will appear on the top line of the dis-
play. (Use
▲
or
▲
keys to toggle the active channel.)
NOTE T
able 1-3 shows the menu structure. Rules to navigate the menu follow the tables.
These two measurement configuration menu items are the same ones used for actual V and I
measurements. See “Measurement configuration” on page 2-15 for details on NPLC rate and
average readings.
SCPI programming — DVM
The commands to perform actual V and I measurements 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
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 2-3
shows an example of how the power supply can be made to operate as a sink. An external
sou
rce, such as a battery charger circuit, whose voltage is higher than the programmed power
sup
ply voltage, is connected as shown. If the supply is operated in remote sense and
V
Charger
> V
Supply
+ I
sink
R
cable
, is satisfied, current I
sink
flows into the positive (+) terminal of
the power supply. Current readback is negative.
CAUTION Exceedin
g current sink capacity (0–5V: 3A max. 5V–15V: Derate 0.2A per volt
above 5V) could cause damage to the power supply that is not covered by the
warranty.
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
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