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Example: Controlling
Microwave Relays
This example shows one way that the Form C Switch can be used to control
an (external) microwave relay. Figure 3-2 shows an Agilent 33311B
Microwave Relay connected to channel 00 of a Form C Switch. The + 5V
source for the microwave relay is provided via channel 15 of the Form C
Switch (via JM148, JM145, and the channel 15NO terminal).
With this configuration, the Form C Switch provides a ground path for the
coil current of the microwave relay. For example, with the Form C Switch
channel 00 relay open (NC connected to C), a ground path (via the channel
0NC terminal, the channel 00 relay, JM102, and JM150) is provided for the
NC side of the microwave relay.
When the microwave relay NC contact is closed, + 5V is applied to the
microwave NC coil and the coil is energized. The same actions occur for the
NO side of the microwave relay if the Form C Switch channel 00 relay is
closed (NO connected to C). To close channel 00, execute:
CLOSE (@100) Close channel 00 relay (connect
NO to C). 1 is the card number and
00 is the channel number.
To open channel 00, use OPEN (@100).
NOTES:
1. Channel 15 is dedicated to supplying + 5V to the microwave relay. The + 5V supply can be used to supply
other external relays connected to the channel 15NO terminal.
2. For this configuration, power to the external relays is limited to 4A maximum, 1A typical per Form C
Switch. You can use separate, external power supplies to supply more than 4A or to supply voltages other than
Figure 3-2. Example: Controlling Microwave Relays
Chapter 3 Using the Agilent E1364A Form C Switch 27