73
Remote Interface Operation
Use the following commands to enable and configure MX+B function:
CALCulate:FUNCtion MXB
CALCulate:STATe {OFF|ON}
CALCulate:STATe?
CALCulate:MXB:MMFactor {<
value
>|MINimum|MAXimum}
CALCulate:MXB:MMFactor? [MINimum|MAXimum]
CALCulate:MXB:MBFactor {<
value
>|MINimum|MAXimum}
CALCulate:MXB:MBFactor? [MINimum|MAXimum]
3.3.6 dB/dBm
A. dB Definition
The dB feature takes a DC or AC voltage measurement and displays it in decibel unit
in correspondence to a relative reference value. The calculation of dB is listed below:
dB = (Input signal in dBm)
–
(Relative value in dBm)
The dB measurement is applied to DC and AC voltage only. The relative value is
adjustable and is stored in a volatile memory. The range for the relative value is
between 0 dBm and 200 dBm, and the default value is 0 dBm.
How to use dB feature
You can either manually select a number for the relative reference or let the
multimeter take the first reading (0 dB) as the relative reference.
Front Panel Operation (to set the relative reference)
1.
Select a measurement function by pressing DCV or ACV button as shown in
Figure 3-27
.
2.
Do the procedure SHIFT + NULL > dB > ENTER > dB REL to access the setting.
3.
Use
◁
and
▷
to move through the digits and
△
and
▽
buttons to increase or
decrease the numbers to your desired value. Press ENTER to set the value.
4.
Press ENTER on “RUN” to start measurement.
