B&K PRECISION BK5493CGPIB [38/57] Percent

5.3 Limit

The limit test allows the user to perform a Pass/Fail test. By setting the upper and lower limit values,

the results will display the amount of Low and High failures. Use the softkeys to adjust Lower and

Upper limits. Set the limits by using the cursor navigation keys and button.

5.4 dB Calculation

The dB and dB math functions apply to DC V and ACV measurements only. This function allows

measurements to be scaled relative to a reference value.

Each dB measurement is the difference between the input signal and the stored reference value (both

converted to dBm): dB = reading in dBm – reference value in dBm

The relative value must be between -200 and +200 dBm (default is 0). You can measure this value by

pressing ‘Measure Ref Value’ or input a specified value using the softkeys.

5.5 dBm Calculation

The dBm function is a logarithmic expression that compares the power delivered to the reference

resistance, relative to 1 mW:

dBm = 10 x log

(reading

/ reference resistance / 1 mW)

5.6 mX+b

The calculation of reading X on screen is performed as follows:

    

Where,

X is the normal display reading on the screen

m and b are the user-entered values

Y is the displayed result

5.7 Percent

If the percent calculation is selected, a reference value must be specified. The percentage calculation

is performed as follows:

 





 

 Input is the measured reading

 Reference is the user-entered constant

 Percent is the displayed result