Fluke 8588A Operator's Manual page 91

The displayed reading can also be altered by selecting a Unit parameter. The
Unit parameter affects how the reading is displayed after the Math Setup formula
is calculated. Measurement Units, for example "V", will not be displayed when
Math Unit is set to ON.
Use the navigation keys to scroll down to Unit and push . The unit choices
and resultant display are
%: When set, the displayed reading is shown as a percentage of the reading (R)
at the time % was enabled. The displayed reading is given by
Display = ((Reading - R)/R * 100.
dB, Ref 1mW into 50 ohm: When set, the displayed reading is the power
delivered to a 50 ohm resistance referenced to 1mW based on a reading (R).
The displayed reading is given by
Display = 10 * log
dB, Ref 1mW into 75 ohm: When set, the displayed reading is the power
delivered to a 75 ohm resistance referenced to 1mW based on a reading (R).
The displayed reading is given by
Display = 10 * log
dB, Ref 1mW into 600 ohm: When set, the displayed reading is the power
delivered to a 600 ohm resistance referenced to 1mW based on a reading (R).
The displayed reading is given by
Display = 10 * log
dB, Ref unity: When set, the displayed reading is a ratio in decibels relative to 1.
The displayed reading is given by
Display = 20 * log
The Unit choices of dB, Ref 1mw are available only in DCV and
ACV.
To reset all Math constants and settings to their default values, push
 and  (Reset Instrument).
(R 2 /50)/1mW)
10
(R 2 /75)/1mW)
10
(R 2 /600)/1mW)
10
(R)
10
Note
Note
Reference Multimeter and 8 ½ Digit Multimeter
Features
87