Teledyne T3DMM6-5, Руководство пользователя

Страница: 94 / 121

93
dBm
The dBm function is logarithmic and based on a calculation of power delivered
to a reference resistance, relative to 1 milliwatts. This function only applies to
an AC voltage and DC voltage measurements.
Press →
【
dB/dBm
】
→
【
On
】
and select
【
Function dBm
】
to enter the
interface shown in the following diagram.
Diagram 2- 45 dBm Function Interface
Table 2- 12 dB Measurement Function Menu Function Description
Function
Menu Settings Description
dB/dBm On/Off Turn on or turn off dB or dBm function.
Function
dBm Open the dBm function and the lower right corner of
the main display will show “dBm”.
Ref R Set the parameter via direction keys: 50Ω ~8000Ω.
Done Save all changes and return to the higher level menu.
The computation method for dBm:
When the dBm function is turned on, the measured value of voltage is
transformed into dBm according to the below formula.
dBm = 10 x Log
10
【
(Reading
2
/R
REF
)/0.001W
】