Boonton 4240 RF Power Meter - Manual (Page 28)

Boonton 4240 Series RF Power Meter
Table 3-1 Operating Controls, Indicators and Connections
(continued)
Reference #
Front Rear Nomenclature Function
13 <REF Level> Key Often relative measurements are required especially when measuring system gains
and losses. One key press of the Ref/Level key makes this easier and faster to
perform. Simply connect the active channel’s sensor to the input signal of the
system under test. Press the Ref/Level key and the reference level is set! Next
connect the sensor to the system output and read the gain or loss directly from the
reference level measurement.
The REF Level menu can be displayed by first pressing the <Menu> key followed
by the <REF Level> key. From there the user may LOAD or SET the reference
level on either channel.
14 Recorder Provides a DC voltage proportional to the measured values for use by an external
recorder.
15 RS232 9-pin D-sub connector for connecting the power meter to the remote control Serial
Bus. Communication parameters can be configured through the <SETUP <RS232>
menu.
16 GPIB 24-pin GPIB (IEEE-488) connector for connecting the power meter to the remote
control General Purpose Instrument Bus. GPIB parameters can be configured
through the <SETUP <IEEE> menu.
17 AC Line Input A multi-function power input module is used to house the AC line input, main
power switch, and safety fuse. The module accepts a standard AC line cord,
included with the power meter. The power switch is used to shut off main
instrument power. The safety fuse may also be accessed once the line cord is
removed. The instrument’s power supply accepts 90 to 264VAC, so no line voltage
selection switch is necessary.
Caution Replace fuse only with specified type and rating:
0.5 A-T (time delay type), 250VAC
Getting Started
3-4