Specifications

Calibration Switches

SHOCK HAZARD Only qualified, service-trained personnel who are aware of the haz-

ards involved should remove instrument covers. Always disconnect the power cable

and any external circuits before removing the instrument cover.Some circuits are act-

ive and have power for a short time even when the power switch is turned off.

Two switches control the access to calibration commands. The switches are on the interface board located at the back

of the unit and are accessible by removing the top cover. To access the calibration switches:

Accessing the Calibration Switch

1. Remove the instrument cover as described under Disassembly.

2. The calibration switch is on the top of the interface board. To change the calibration switch settings, use a small

screwdriver to move the switches.

3. Replace the top cover when finished.

Do not use a pencil to move the switches. Any graphite dust that gets on the switches will conduct

electricity.

Switches shown

in ON position

Switch Functions

Switches 1 and 2 set the calibration configuration as follows

Switch 1 Switch 2 Description

Normal ON ON

This is the default or as-shipped switch setting. The cal-

ibration functions are accessible after entering a numeric

password. The default password is 0 (zero).

Clear Password OFF ON

The admin/calibration password is reset to 0 when the

instrument is first powered on. Use this setting if you have

forgotten the password.

Inhibit Calibration OFF OFF

All calibration commands are disabled. This is useful where

calibration access is guarded by instrument seals.

Agilent N8900 Series Operating and Service Guide 149