TEXIO DL-1060, Instruction Manual, Page: 80 / 146

74
Figure 3-27
※
Note:To disable the dB function, you always need to go to Math submenu and
select “OFF” or press other measurement buttons. The
“
MATH” annunciator
should not be lit when disabled.
Remote Interface Operation
Use the following commands from your PC terminal to make the dB measurement:
CALCulate:FUNCtion DB
CALCulate:STATe {OFF|ON}
CALCulate:STATe?
CALCulate:DB:REFerence {<
value >|MINimum|MAXimum}
B. dBm
Definition
With dBm selected, a voltage measurement is displayed as the level of power, relative
to 1 milliwatt, dissipated through a reference resistance. The reference resistance is
adjustable in DL-1060. The calculation of dBm is defined as below:
mW
Z
V
dB
ref
in
m
1 / log 10
2






 =
※
Note 1:
in
V
in
V
is the input signal voltage.
ref
Z
ref
Z
is the reference
resistance.
※
Note 2: Change of reference resistance will not affect the stored relative reference
value.
※
Note 3: The Zref is adjustable with a range from 50Ω to 8 000 Ω. The default value
is 600 Ω.
※
Note 4:The defined selected reference value is storedin a volatile memory and will
becleared after the multimeter has been power-off.
※
Note 5: This feature is available for DCV and ACV only.
ref
Z