Multiple Unit Connections; Parallel Connections - Agilent Technologies N8900 series Operating Manual

Autoranging system dc power supply

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Multiple Unit Connections

Share Connections

Group Connections

Series Connections

SHOCK HAZARD Turn off AC power before making rear panel connections.

HAZARDOUS VOLTAGES All models generate voltages in excess of 60 VDC, with some

models rated at up to 1,500 VDC! Ensure that all instrument connections, load wiring,

and load connections are either insulated or covered so that no accidental contact

with lethal output voltages can occur.

All output connections must be made with the unit turned off, and must be performed

by qualified personnel who are aware of the hazards involved. Improper actions can

cause fatal injury as well as equipment damage.

Never touch cables or connections immediately after turning off the unit. Depending on the model,

lethal voltages can remain at the output terminals for 10 seconds or more after turn-off. Verify that

there is no dangerous voltage on the output or sense terminals before touching them.

Parallel Connections

Equipment Damage Only connect power supplies that have identical voltage and current ratings

in parallel.

Connecting power supplies in parallel provides a greater current capability than can be obtained from a single unit. The

figure below shows how to connect three units in parallel. If desired, up to 10 units may be connected in parallel.

If remote sensing is desired to compensate for the lead drops, connect the remote sense leads of the unit closest to the

load directly to the load. Although the illustration shows remote sensing being used, it is recommended, but not

required for parallel operation.

Bus bars can be used instead of cables to parallel the output terminals in a stacked configuration. Place the bus bars on

the inside of the output terminals. Keep the wiring from the power supply to the load as short as possible and twist or

bundle the leads to reduce lead inductance and noise pickup. The goal is to always minimize the loop area or physical

space between the + and - output leads from the power supply to the load.

SHOCK HAZARD Using bus bars negates the safety function of the safety covers, as the

exposed portion of the bus bar creates a shock hazard.

Agilent N8900 Series Operating and Service Guide

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