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Using the Preselector
2–2
NOTE. To operate the Preselector remotely, you need to consult the documenta-
tion for your controller to determine how to send commands and interpret
received messages in your controller's programming language.
Use the Preselector remotely as follows:
1. Plug the Preselector into a power source (90–250 VAC, 48–63 Hz).
2. Connect the spectrum analyzer input to the RF OUTPUT connector on the
Preselector's front panel.
3. Connect a GPIB 24-pin cable to the IEEE STD 488 PORT connector on the
rear panel of your Preselector and to the GPIB network.
4. Verify that the bus address on the rear-panel ADDRESS switch is not used by
any other device on the network. If the address is used by another device, use
the switch to select a new address. The Preselector will use the new address
when it is turned on.
5. To make sure that your GPIB network will operate reliably, verify that:
H Each device on the network has a unique device address.
H The network has fewer than 16 devices.
H No more than 2 meters (6 feet) of cable separates any two devices, and
that the entire network uses less than 20 meters (65 feet) of GPIB cable.
H At least two-thirds of the devices on the network are turned on when the
network is operating.
H The network uses a star or linear configuration, not a loop or parallel
configuration.
6. Turn on the Preselector. The front-panel LEDs will light sequentially. When
the BYPASS LED lights, the unit is ready to use.
NOTE. If the LEDs do not light, refer to Chapter 3, Performance Verification.
Pressing the REMOTE/LOCAL switch will not turn on remote operation; it only
turns remote operation off.
7. Turn on the spectrum analyzer.
8. Turn on the controller and start the GPIB communications software.
9. Connect the RF source to the RF INPUT connector on the Preselector's front
panel.
2706 RF Preselector
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