User`s guide
3- 20 Agilent B2900 User’s Guide, Edition 2
Installation
Installing the Interlock Circuit
Procedure 1. Mount two mechanical switches onto your shielding box, so that the switches
close when the access door is closed, and open when the door is opened. See
Figure 3-13 and Figure 3-14 for the switch dimensions.
2. Mount an LED onto your shielding box. See Figure 3-12 for the LED
dimensions.
The LED is used as a high voltage indicator which is lit when B2900 is in the
high voltage output status.
3. Mount a D-sub connector onto your shielding box.
4. Use a wire and short the following pins of the D-sub connector. See Figure 3-11
for a connection example.
For the negative logic: Pins 24 and 25
For the positive logic: Pins 16 and 17
5. Use a wire and connect the two switches in series between the following pins of
the D-sub connector. See
Table 3-1 for the Digital I/O pin assignment.
For the negative logic: Pins 16 and some ground pins
The ground pins are pin numbers 15 and 17 to 21.
For the positive logic: Pins 24 and some +5 V pins
The +5 V pins are pin numbers 22, 23, and 25.
6. Use a wire and connect the LED between pin 14 and some ground pins of the
D-sub connector. Then set pin 14 to HIGH VOLTAGE LAMP. See
“DIO
Configuration dialog box” on page 4-46.
Figure 3-12 Dimensions of the LED (Agilent part number 1450-0641)
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