Description
Model 75PA-088 is a benchtop attenuator assembly containing 2 relay step attenuators with 75 Ohm impedance. The attenuators have attenuation range 0 to 95.5 by 0.5dB steps and operate DC-1000 MHz. The attenuators can be controlled manually or remotely. It is available with 75 Ohm F female coaxial RF connectors. The RF connectors are located on the front panel. The attenuators are bi-directional. We label the RF connectors as input/output as a naming convention only.
Default Settings
Attenuator assemblies with Ethernet/RS-232 remote control are shipped from JFW with the network interface set to DHCP mode and the serial baud rate set at 57600. These settings can be changed manually with the keypad or remotely using the NET or SERIAL remote commands. The display on the front panel shows the current settings for network mode, IP address and baud rate.
Manual Attenuator Control
The manual control menu allows you to set each attenuator address to an attenuation setting. If you scroll through the attenuator address numbers, the current dB settings will be shown.
Remote Attenuator Control
This attenuator assembly can be remotely controlled via an Ethernet connection or a serial connection (i.e. RS-232). The network settings can be changed manually with the keypad or remotely using the NET remote command. The network interface can be set to either DHCP mode or Fixed Address mode. A RS-232 connection to the test system is made using a null modem type serial cable. Baud rates up to 155200 baud are available. The baud rate can be changed manually with the keypad or remotely with the SERIAL remote command.
Remote Command Set
The firmware manual for our latest generation firmware is available for download. This manual lists all of our remote commands with command syntax and examples. Our firmware uses simple ASCII formatted remote commands. If you are connected to a JFW test system and send the HELP command, it will respond back with a list of all remote commands for that specific test system.
