BNC 1201 - 6 1/2 Digit Digital Multimeter - Manual (Page 89)

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reference value.
The Zref is adjustable with a range from 50Ω to 8000 Ω. The default
value is 600 Ω.
The user selected reference value is stored in a volatile memory and
will be cleared after the multimeter has been power-off.
This feature is available for DCV and ACV only.
How to set the reference resistance
User can set the reference resistance either through the front panel
operation or the remote interface operation.
Front Panel Operation
Press CONFIG + SHIFT + MIN/MAX, then use ◁ and ▷ to move
through the digits and △ and ▽ to increase or decrease the numbers to
a desired value. Press ENTER to set the value. The locations of the
buttons are shown with red rectangle frames in Figure 4-23.
Figure 4-23
How to make a dBm measurement
Select a measurement function by pressing DCV or ACV button. The
dBm feature is only available for DCV and ACV only.
To enable dBm, press SHIFT + MIN/MAX buttons.
After enabling the dBm operation, user can select the reference
resistance as mentioned above. The default for the reference