Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 195 / 813

R&S
®
ZVA/ZVB/ZVT Trace Menu
1145.1084.12 4.33 E-6
V. If R
DUT
the power consumption of the resistor can be neglected so that P
DC
= 1/ R * U(DC
MEAS 10 V) * U(DC MEAS 1 V), hence the Constant k must be set equal to 1/ R. The unit
field shows the SI unit of an inverse resistance (W/V
2
). The input field for c is disabled (c is not
used)
.
•
U
DC
= const., P
R
= U (DC INP2)
2
/R —> P
DC
= c * U (DC MEAS 1 V) + k * U (DC MEAS 1
V)^2. Assume that the DC power supply provides a constant voltage U
DC
and that the current
through the DUT is measured by means of a precision resistor R connected in series and DC
INP 2. P
DC
= U
DUT
/ R * U(DC MEAS 1 V) = (U
DC
– U
R
)/ R * U(DC MEAS 1 V) = U
DC
/ R *
U(DC MEAS 1 V) – 1 / R * U(DC MEAS 1 V)
2
, hence the Constant c must be set equal to
U
DC
/ R and k must be set equal to 1/R. The unit fields for c and k show the SI units of a current
(W/V) and an inverse resistance (W/V
2
), respectively.
Models 1 and 4 provide the exact DC power supplied to the DUT, the two other models are based on
the approximation P
R
= 0.
Remote control: [SENSe<Ch/Tr>:]PAE:EXPRession
[SENSe<Ch/Tr>:]PAE:C
[SENSe<Ch/Tr>:]PAE:K
Power Sensor...
Opens a configuration dialog for the measurement of wave quantities using an external power meter.
Power Sensor measurement example
The simplest test setup for a Power Sensor measurement involves one analyzer source port and a
power sensor. The power sensor is connected e.g. to the analyzer's USB port and provides the (scalar)
wave quantity results.
•
The controls in the Power Meter panel show the configured power meters, open the System
Configuration – External Power Meters dialog for adding and configuring external power
meters, and start Auto Zeroing for the selected power meter.