2 Installation
26 Series N6700 User’s Guide
Effect on Specifications
Specifications for outputs operating in parallel can be obtained from
the specifications for single outputs. Most specifications are
expressed as a constant or as a percentage (or ppm) plus a constant.
For parallel operation, the percentage portion remains unchanged
while constant portions or any constants are changed as indicated
below. For current readback accuracy and temperature coefficient of
current readback, use the minus current specifications:
Current All parallel specifications referring to current are twice the single output
specification except for programming resolution, which is the same for both
single output and parallel output operation.
Voltage All parallel specifications referring to voltage are the same as for a single
output except for CV load effect, CV load cross regulation, CV source effect,
and CV short term drift. These are all twice the voltage programming accuracy
(including the percentage portion) at all operating points.
Load Transient
Recovery Time
Load transient specifications are typically twice the single output.
Series Connections
WARNING
SHOCK HAZARD Floating voltages must not exceed 240 VDC. No output
terminal may be more than 240 VDC from chassis ground.
CAUTION
Only connect outputs that have identical voltage and current ratings in series.
Each output has reverse voltage protection diodes across its output terminals.
The current conducted by this diode is not internally limited by the output.
Never connect an output in such a way that the diodes will conduct current in
excess of the rated current of the output since damage could result.
Connecting outputs in series provides a greater voltage capability
than can be obtained from a single output. Because the current is the
same through each element in a series circuit, outputs connected in
series must have equivalent current ratings.
The following figure shows an example of how to connect two
outputs in series to a single load with local sensing.. Connecting the +
S terminal of output 2 to the - S terminal of output 1 and removing
the sense jumper (between + S and + V) on output 2 compensates for
the IR drop in the load lead from output 2 to output 1.
If voltage drop in the load leads is a concern, connect the sense leads
of output 1 and output 2 for remote sensing as shown in the figure on
the right. Note that the + sense lead of output 2 must remain
connected to the -sense terminal of output 1. The outputs may be set
as previously described.
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