User manual Manual

ADVANCED MEASUREMENT
59
Select reference
resistance
To change the reference resistance,
press the Up/Down key. The new
resistance appears in the 2nd display.
The following is the resistance list.
2
4
8
16
50
75
93
110
124
125
135
150
250
300
500
600
800
900
1000
1200
8000
View result in
Watts
When the reference resistance is less than 50Ω, it is
possible to calculate the watt value. If the reference
resistance is greater than 50Ω then this step can be
ignored.
To calculate the power, press the
Shift key followed by the
/
key
again.
/ EXITSHIFT
/
dBm
Watt result
appears
W
dB
SDC
m
W
W
Indicates W measurement
16Ω
2nd display indicates the reference
resistance
Deactivate
dBm/W
measurement
To cancel the dBm/W
measurement, press the Shift key
followed by the
/
key, or simply
activate another measurement.
/ EXITSHIFT
/
dBm
Measure dB
Background
dB is defined as [dBm−dBmref]. When the dB
measurement is activated, the GDM-8261A calculates the
dBm using the reading at the first moment and stores it
as dBmref.
Activate dB
Press the Shift key followed by the
Hz/P key. The 1st display shows dB,
and the 2nd display shows the
current Voltage reading.
/ EXITSHIFT
Hz/P
dB