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2 Installation
NOTE
Load Transient
Recovery Time
Additional Load Considerations
42
To program outputs connected in series, first program the current
limit of each output to the total desired current limit point. Then
program the voltage of each output so that the sum of both voltages
equals the total desired operating voltage. The simplest way to
accomplish this is to program each output to one half of the total
desired operating voltage.
The operating mode of each output is determined by the output's programmed
settings, operating point, and load condition. Because these conditions may
change during series operation, the operating status indicators on the front
panel will reflect these changes. This is normal. Momentary status changes are
also normal.
Effect on Specifications
Specifications for outputs operating in series can be obtained from
the specifications for single outputs. Most specifications are
expressed as a constant or a percentage (or ppm) plus a constant.
For series operation, the percentage portion remains unchanged
while constant portions or any constants are changed as indicated.
Voltage
All series specifications referring to voltage are twice the single output
specification except for programming resolution, which is the same as for a
single output.
Current
All series specifications referring to current are the same as for a single
output except for CC load effect, CC load cross regulation, CC source effect,
and CC short term drift. These are twice the current programming accuracy
(including the percentage portion) at all operating points.
Load transient specifications are typically twice the single output.
Response Time with an External Capacitor
When programming with an external capacitor, voltage response time
may be longer than that for purely resistive loads. Use the following
formula to estimate the additional up-programming response time:
nse Time = (Added Output Capacitor)X(Change in Vout)
Respo
Note that programming into an external output capacitor may cause
the DC Power Analyzer to briefly enter constant current or constant
power operating mode, which adds additional time to the estimation.
(Current Limit Setting)−(Load Current)
Model N6705 User's Guide
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