Scaling - DATATEC EDU34450A Guia Del Usuario

Scaling

There are two Scaling operations available: dB Scaling and dBm Scaling. The scaling operation applies to voltage
measurements only.
dB Scaling
Each dB measurement is the difference between the input signal and a stored relative value, with both values
converted to dBm. When enabled, the dB operation computes the dBm value for the next reading, stores the dBm
result into the relative value register, and immediately produces the dB calculation. The formula used for calculating
dB measurements is:
dB = Reading in dBm – Relative Value in dBm
The relative value can take any value between 0 dBm and ±120.000 dBm. The default relative value is 0 dBm. You
can either let the instrument automatically measure this value, or you can enter a specific value.
The first displayed reading is always precisely 000.00 dB.
Front Panel Operations
Press [Shift] > [Null] | Math > Function Scaling > Scaling ON | OFF. Then press Scaling Function and select dB to
enable the dB Scaling operation.
The reading before the math formula is applied is shown in the secondary display.
To change the dB reference value, press dB Reference Value. Use the arrow keys to set a desired value. Press [Enter]
when done.
70 Keysight EDU34450A User's Guide