Bnc 1201 - 6 1/2 Digit Digital Multimeter Manual do Utilizador descarregar pdf (Página 88)

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:

ref

1/log10















※ Note:

V is the input signal voltage.

ref

Z is the reference resistance.

※ Note: Change of reference resistance will not affect the stored relative

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Bnc 1201 - 6 1/2 Digit Digital Multimeter Manual do Utilizador Página 88