14
4.1.2.
SETUP 2/3: Configuration of the measurement parameters
: configures the filter, the impedance, the reference in dBm and in power
W.
: configures the type of input, current or voltage, the ratio indicated on the
clamp, and the unit (default is A).
: configures the type of measurement assigned to the mathematical
channel and the values and unit of A and B of the function Ax+B.
Measurement 1/2: Configuration of the measurement parameters
: 300 MHz MLI filter for measure on variator
: choice of desired input impedance
10 M
only in 100mV
DC
and 1000mV
DC
As default, 10mV range = 10M
, 1,000mV range = 10M
:
adjustment of the reference in dBm Adjustment of the
reference resistance (dBm REF) between 1
and 10000
, for
measurements in dBm from voltage V
AC
or V
AC
+
DC
-
Selection of a digit by the navigation key and modification of the
digit
-
Validation of the reference resistance in dBm and exit from the
menu by "Ok"
The dBm measurement calculates the power delivered to a reference resistor, referred to 1 mW. It is calculated as
follows:
𝑃 =
(𝑉
𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑
)²
𝑅
. Pref = 1 mW
𝑑𝐵𝑚 = 10 log(
𝑃
𝑃
𝑟𝑒𝑓
) = 10log (
1000 × 𝑉
𝑚𝑒𝑎𝑠𝑢𝑟𝑒𝑑
2
𝑅𝑒𝑓𝑒𝑟𝑒𝑛𝑐𝑒 𝑟𝑒𝑠𝑖𝑠𝑡𝑎𝑛𝑐𝑒
)
Default value 600
.
Reminder: a measurement of 0dBm with a reference resistance of 600
is made using a voltage of 0.7746 V
AC
.
