User`s guide

Agilent B2900 User’s Guide, Edition 2 3- 19

Installation

Installing the Interlock Circuit

The interlock circuit is a simple electric circuit, as shown in Figure 3-11. The circuit

electrically opens when an access door is opened, and closes when the door is

closed.

B2900 cannot apply high voltages over 42 V when the Digital I/O interlock

terminal is open. To perform high voltage measurements, the B2900 interlock

terminal must be connected to the interlock circuit installed in the measurement

environment such as the shielding box. The interlock circuit is important and

necessary to prevent electrical shock when the user touches the measurement

terminals.

WARNING Potentially hazardous voltages of up to 210 V may be present at the High

Force, High Sense, and Guard terminals when the interlock circuit is closed.

To prevent electrical shock, do not expose these lines.

Requirements • LED (Agilent part number 1450-0641), 1 ea.

• Mechanical switch (Agilent part number 3101-0302 or 3101-3241), 2 ea.

• 25-pin D-sub connector (for wiring, mounted on the shielding box), 1 ea.

• Connection wire

• 25-pin D-sub cable, 1 ea.

Figure 3-11 Interlock Circuit



Mechanical switches

Shielding box

LED

Access door

D-sub connector

Interlock circuit

B2900

Digital I/O

15, 19

17, 18

24, 25

Dsub cable

15, 19

22, 23

16, 17

Negative

Positive