Agilent Technologies N6700 manual Series Connections, Effect on Specifications, Recovery Time

2 Installation

On mainframes with earlier version firmware, first program both outputs to the desired output voltage. Then program the current limit point of each output. The current limit of the paralleled outputs will be the sum of both individual current limit points.

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 Load transient specifications are typically twice the single output.

Recovery Time

Series Connections

	SHOCK HAZARD Floating voltages must not exceed 240 VDC. No output
WARNING
	terminal may be more than 240 VDC from chassis ground.
	Only connect outputs that have identical voltage and current ratings in series.
CAUTION
	To prevent currents from damaging the power system when the load is
	connected, always turn series-connected outputs on and off together.
	Do not leave one output on while the other is off.
	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 figures show how to connect two outputs in series to a
	single load. 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.

32 Series N6700 User’s Guide