BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 88)

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Observe the displayed reading.
Figure 4-22 shows the locations of these buttons with red rectangle
frames.
※ Note: Press SHIFT+NULL again to disable this feature. The “MATH”
anunnciator on the display indicates the state of a mathematical feature.
Figure 4-22
Remote Interface Operation
Use the following commands from your PC terminal to make the dB
measurement:
CALCulate:FUNCtion DB
CALCulate:STATe {OFF|ON}
CALCulate:STATe?
CALCulate:DB:REFerence {<value>|MINimum|MAXimum}
B. dBm
Definition
With dBm selected, a voltage measurement is displayed as the level of
power, relative to 1 milliwatt, dissipated through a reference resistance.
The reference resistance is adjustable in 1201. The calculation of dBm is
defined as below:
mW
Z
V
dB
ref
in
m
1 / log 10
2






 
※ Note:
in
V is the input signal voltage.
ref
Z is the reference resistance.
※ Note: Change of reference resistance will not affect the stored relative
or