Boonton 9240 RF Voltmeter Uživatelský manuál stáhnout pdf (Strana 29)

100

Boonton 9240 Series RF Voltmeter

Table 3-1 Operating Controls, Indicators and Connections

(continued)

Reference #

Front Rear Nomenclature Function

3 ◄ 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 (Volts, %). 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).

4 ▲ 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.

5 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.

6 Power Switch Turns the instrument off and on.

7 <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.

8 <Sensor> Key Displays the serial number of the installed probes and allows for editing of the

Voltage Probe parameters.

9 <FREQ> Key Selects the operating frequency display. NOTE: The probes are not provided with

frequency calibration factors. Changing this parameter has no affect on the

measurement.

10 <AVG> Key Selects the filter averaging display for the measurement value.

11 <Zero > 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 > 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 Zero menu can be displayed by first pressing the <Menu> key followed by

the <Zero > key. From there the user chooses the the channel to perform a Zero

operation on.

Getting Started

3-3

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