Agilent Technologies 6629A User's Guide download pdf (Page 6)

On the N67xxA models, the OV

trip point can be programmed

up to 60 V on all 50 W and 100 W

output modules. When over-

voltage protection is enabled,

the power supply will turn off

its output if the output voltage

reaches the programmed over-

voltage limit. The voltage is

measured at the output termi-

nals. There is no SCR crowbar

nor is there a fixed overvoltage

threshold in any of the N67xxA

models. When an overvoltage

occurs, the OV enunciator will

appear next to the channel

number in the bottom left corner

of the display and the OV status

bit is set for that output.

662xA OV Trigger Connections

Each output of the 662xA

power supplies has two OV

terminals on its rear panel

terminal block labeled +OV

and –OV. By connecting these

terminals in parallel, an over-

voltage shutdown on any one

output will also trigger the

overvoltage on the remaining

outputs. Up to eight terminals

can be strapped together.

The N67xxA Modules lack

these OV terminals, but not the

functionality. The functionality

is achieved in firmware by

using the “OUTPut:PROTection:

COUPle <on, off, 0, 1>” com-

mand. This command enables/

disables output coupling for

protection faults. When enabled,

ALL output channels are dis-

abled when a protection fault

is triggered. When disabled,

only the affected output channel

is disabled when a protection

fault is triggered. This eliminates

the need for physical OV

terminals. The standard RI/DFI

on each N6700A mainframe

extends this functionality to

more than one mainframe.

Please refer to the Digital

Control Connections section

of the N67xxA User’s Guide for

more information on configuring

the digital port for RI/DFI.

Overcurrent Protection

662xA: When the Overcurrent

protection feature is enabled,

and the output is sourcing cur-

rent and enters +CC operating

mode, the output will be

disabled (set to zero volts and

minimal current) and the word

OVERCURRENT will appear

on the front panel display. The

OC status bit is set for that

output.

N67xxA: When over-current

protection is enabled, the

power supply will turn off its

output (set minimum voltage,

minimum current, and goes

into a high-impedance state) if

the output current reaches the

programmed current limit. The

output current is measured

across a current shunt resistor

on the inboard side of the

output terminals. When an

overcurrent condition occurs,

the OC enunciator will appear

next to the channel number in

the bottom left corner of the

display and the OC status

bit is set for that output.

Unregulated Output,

Overtemperature, and Errors

Operation and handling

is the same between the

662xA and the N67xxA.

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