8508A
Users Manual
Recall Division Constant
Z?
adj237f.eps
Recall Division Constant
Z?
(Nr3) Recalls the defined value of z.
Decibel Calculations
Decibel operations calculate, and express in decibels, the ratio of the reading to one of
four standard references: unity, and 1 mW in either 50 Ω, 75 Ω or 600 Ω. As the dB
calculation is set as the final part of any calculation, it is also possible to use the other
Math operations to alter the effective reference value.
Enable dB Calculation
Selects the decibel operation to be performed on the measurement. This operation
computes the dB ratio of a corrected A-D result and a stored reference value "R".
DB ON
OFF
phs
adj238f.eps
Enable dB Calculation
ON / OFF
Displays the result of the calculation 20log[(Reading)/dB Ref].
Power On and Reset Conditions
OFF.
Set dB Reference Value
The user defines the value of the reference R, to be used in dB calculation. All selections
are mutually exclusive.
DB_REF UNITY
R50
R600
phs
R75
adj239f.eps
Set dB Reference
UNITY
Selects a dB reference of unity, in whole units of the active function.
Each of the following commands selects the dB reference voltage (as shown in
parenthesis), which corresponds to 1 mW in the given impedance. These are only
available for use in voltage functions
R50 50 Ω (i.e., 0.223606800V)
R75 75 Ω (i.e., 0.273861280V)
R600 600 Ω (i.e., 0.774596670V)
Power On and Reset Conditions
UNITY.
4-30
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