15
N3970A UM-1
■ PO W E R ME T E R OP E R AT I O N
After instrument turn on, the meter will be calibrated at the last
used λ. To change parameters, push POWER METER, then:
To select a calibrated λ, push +/-. λis displayed on the top right
side of the display.
To display relative power, push ABS/REL. The display will
show dB R.
To store a new reference, push SET REFfor 3 seconds.
To display the stored reference value, keep ABS/REL depressed.
To change the dBm display between linear and log, access the
hidden keypad and push dBm/W.
If the meter detects a modulated signal, the display will change
to show the actual measured modulation frequency in Hz,
and if a standard tone is detected ( eg 270 Hz, 1 KHz,
2 KHz ), a buzzer will sound. This is useful for fiber
identification and signalling. The meter can also be used to
check the actual modulation frequency of test sources.
