How To Set A Reference To A Specific Amplitude; Ref Set; How To Set A Reference To A Specific Amplitude (In Units Of Db Relative; For Example, Dbf Or Dbv) - HP 8642A Operating Manual

Synthesized signal generator

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Model 8642A/B

Relative Amplitude (cont'd)

REF SET Example 2

Configure the display to read each subsequent amplitude in dBf (that is, dB relative to

1 femtowatt: 0 dBf = -1 20 dBm).

First select I INSTR P R E S E T ! to put the instrument in a known state, then:

APRS - 1 2 0 DM

, ' 0 0.0 0 0 0 0 0 I T / Z

The AMPTD REL annunciators indicate the displayed amplitude is relative to a

reference amplitude. The displayed amplitude is -20.0 dB (dBf, in this case). The

actual output amplitude is the displayed amplitude plus the amplitude reference;

therefore, - 2 0 dB + (-120 dBm) = - 140 dBm.

How to Set a Reference to a Specific Amplitude

(In units of dB relative; for example, dBf or dBV)

If the output amplitude has already been set to be displayed in relative units (for

example, dBf or dBV), use the following procedure to set a specific

rAMPTD I followed by the value of the desired reference amplitude (in relative dB

units) and REL ZERO ( 1 SHIFT 1 I AMPTDl )

REF SET Example 3

Configure the front panel to display all amplitude output values as an offset from a

20 dBf amplitude reference.

First set the display to read amplitude in dBf using the Relative Zero function as

described in "REF SET Example 2" above, then proceed with the following example:

A P 2 0 D B A P R Z

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