Boonton 4240 RF Power Meter - Manual (Page 27)

Boonton 4240 Series RF Power Meter
Table 3-1 Operating Controls, Indicators and Connections
(continued)
Reference #
Front Rear Nomenclature Function
4
◄ and ► Keys In entry mode, pressing ◄advances the cursor to the left. In the measurement
mode of operation pressing the ◄ key sets the Active channel to Linear
measurement units (Watts, %). In entry mode, pressing ►advances the cursor to
the right. In the measurement mode of operation pressing the ►key sets the
Active channel to Log measurement units (dBm, dBr).
5
▲ and ▼ Keys Used for incrementing or decrementing numeric parameters, selecting from lists,
or scrolling through multi-line displays. In the measurement mode of operation
pressing the ▲ key moves the Active Channel cursor up on the display. For
example if the active channel is set to 2, pressing the ▲key will cause channel 1
to be the active channel. Pressing the ▼ key moves the Active Channel cursor
down on the display. If the active channel is set to 1, pressing the ▼ key will
cause channel 2 to be the active channel.
6 Enter Key In entry mode, initiates the procedure to change a parameter. In parameter entry
mode, terminates the current command and changes the parameter to the last
displayed value. In the measurement mode, display the active channels
CHANNEL menu.
7
Power Switch Turns the instrument off and on.
8
<Menu> Key Displays and allows editing of the instrument's operating parameters. Returns
instrument to local mode when operating in the bus remote mode. Escapes back
to measurement screen from any menu.
9
<Sensor> Key Displays the serial number of the installed sensors and allows for editing of the
sensor parameters.
10
<FREQ> Key Selects the operating frequency display.
11 <AVG> Key Selects the filter averaging display for the measurement value.
12
<Zero/CAL> Key One Key Press Operation. When measuring low level signals it is important to
zero the channel prior to measuring the signal. When the Active Channel is
measuring levels below approximately -50 dBm, depressing the <Zero/Cal> key
will use the measured reading as the zero offset. This allows for fast zeroing of
the most sensitive range of the channel so that the needed measurement can be
performed faster.
The user may also perform a 0 dBm Fixed Calibration by one key stroke of the
<Zero/Cal> button. Simply connect the sensor to a 0 dBm source and press the
<Zero/Cal> key. The instrument detects that a 0 dBm signal is present and sets a
calibration factor accordingly to indicate 0.00 dBm.
The Zero/Cal menu can be displayed by first pressing the <Menu> key followed
by the <Zero/Cal> key. From there the user chooses the function (Zero, Fixed
Cal, Auto Cal) and the channel to perform the calibration on.
Getting Started
3-3