Changing Settings; Removing The Top Cover; Setting Up Control Output Signal And Dc Isolated Input Signal; Using External Power Source - Agilent Technologies 4286A User Manual

When you use the internal pull-up resistor and apply voltage to the control
output signal from an external power source, the permissible voltage range is
between 5 and 15V.
If your current settings are default settings or if you wish to change your settings, follow the
steps below.

Changing Settings

You need to change your settings depending on the signal output format (open-collector,
internal voltage output, or external voltage output) of your handler interface. Two switches
are provided for changing settings. The setting of both switches can be changed on the top
shield. (See \Handler Interface Board Switches".)
See \Electrical Speci cation of Handler Interface" rst to become familiar with electrical
characteristics of each signal and operations of the interface board and I/O circuits before
changing your settings.
Also, check the default settings in \Checking Default Settings". If you need to change the
default setting, follow the steps below.

Removing the Top Cover

1. Turn OFF the 4286A, disconnect the power cable, and wait for a few minutes to allow
capacitors in the 4286A to discharge.
Warning
The 4286A internal circuits carry high voltage during operation and
immediately after it has been turned OFF. To prevent injuries due to
electrical shocks, be sure to wait for at least few minutes before removing
the cover to make sure that capacitors in the 4286A discharge completely
.
2. Remove 4 back legs that hold the top cover and rear panel together.
3. Fully loosen the screw behind the top cover.
4. Slide the top cover backward and lift it up to remove it. Find the top shield, which shows
the locations and default settings of SW1 and SW2.

Setting up Control Output Signal and DC Isolated Input Signal

Select either external or internal power source for supplying voltage to the control output and
DC isolated input signals.
Set SW1 as follows:

Using External Power Source.

1. Select whether to use the internal pull-up resistor or to mount a pull-up resistor at the
handler side of the board.
Table 4-3. SW1 Setting
Power Source
External Source Switch it over toward the rear panel.
Internal Source Switch it over toward the front panel.
Set SW2(1) through SW2(3) and SW2(6) and SW2(8) as follows:
SW1
4286A with Chip Handler 4-13