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Digital Multimeter Operation
2
Math Operations
U3606A User’s and Service Guide
59
dBm measurements
The logarithmic dBm (decibels relative to 1 mW) scale is often used in RF
signal measurements. The U3606A takes a measurement and calculates the
power delivered to a reference resistance (typically 50
Ω
, 75
Ω
, or 600
Ω
).
Voltage measurement is then converted to dBm.
The dBm function is logarithmic, and is based on a calculation of power
delivered to a reference resistance, relative to 1 mW. The formula used for
calculating dBm measurements is:
You can select the reference resistance value through the utility menu. The
default settings is 600
Ω
. See
“Selecting a dBm reference resistance
on page 121 for more information.
Enabling the dBm operation
Press
Shift
>
dBm
to enable the dBm operation.
The dBm annunciator is illuminated and the dBm function is enabled.
Press
Shift
>
dBm
again or
Shift
>
Exit
to exit the dBm mode.
N O T E
This math operation applies to voltage measurements only.
dBm
10 log
10
reading
2
reference
resis
ce
tan
(
)
⁄
1
mW
(
)
⁄
(
)
×
=
dBm annunciator
Содержание U3606A
Страница 1: ...Keysight U3606A Multimeter DC Power Supply User s and Service Guide ...
Страница 2: ......
Страница 12: ...12 U3606A User s and Service Guide ...
Страница 128: ...3 DC Power Supply Operation Remote Sensing 106 U3606A User s and Service Guide ...
Страница 160: ...4 System Related Operation Remote Operation 138 U3606A User s and Service Guide ...
Страница 198: ...5 Verification and Performance Tests Additional Verification Tests 176 U3606A User s and Service Guide ...
Страница 242: ...6 Calibration Procedures Adjustments procedures 220 U3606A User s and Service Guide ...
Страница 291: ...List of Error Messages 9 Error Messages U3606A User s and Service Guide 269 ...