Boonton 9240 RF Voltmeter - Manual (Page 45)

Boonton 9240 Series RF Voltmeter
Press the <REF Level> key to enter a value or to use the current channel measurement for the reference level. The
measurement units will automatically change to dBr for logrythmic units or % for linear units for subsequent measurements.
An example of the instrument's display is shown in Figure 3-19.
R E F E R E N C E L E V E L
C H 1 C H 2
d B > + 0 0 . 0 0 + 2 5 . 0 0
M O D E L O A D S E T
Figure 3-19. Zero and Calibration Display
Table 3-9 Reference Level Menu Functions
Function Description
Parameters Defaults
dBm
Reference level value in Preset -99.99 to 99.99 dBm 0
mode.
MODE
Reference level mode. "LOAD" LOAD, SET, OFF OFF
makes the current channel
measurement as the reference level.
The Set mode is used to select the
entered reference level. The Off mode
disables the reference level
adjustment.
To set a reference level, depress the <REF Level> key to display the REFERENCE LEVEL menu. Move the cursor to the
reference value for the appropriate channel. (Channel 1is default.) Depress the <Enter> key to initiate the editing process. Use
the arrow keys to edit the reference value in dBm. Once the desired value has been selected, depress the <Enter> key to leave
the editing function. To use this value as the reference, depress the <Down> arrow key to MODE, depress the <Enter> key for
mode selection and using the <Up> or <Down> arrow keys, select SET. Depressing the <Enter> key will place the appropriate
channel to the "dBr" mode of operation using the set value as the reference.
The instrument can also load the current measured value as the reference level. To do this, depress the <REF Level> key to
display the REFERENCE LEVEL sub-menu. Navigate the cursor using the arrow keys to the MODE selection of the desired
channel. Depress the <Enter> key for mode selection and using the <Up> or <Down> arrow keys, select LOAD. Depressing
the <Enter> key will place the appropriate channel to the dBr mode of operation using the measured value as the reference
level.
Getting Started
3-19