©
National Instruments Corporation
13
NI 5622 Calibration Procedure
Figure 2.
Connection Changes for Power Splitter Amplitude Imbalance Correction
6.
Measure the power (in watts) of the sine wave using the power meter.
This value is the
Measured Sine Wave Power of Port 2
used in step 7.
7.
Calculate the amplitude imbalance between the two output ports of the
power splitter using the following formula:
Splitter Power Correction
where
a
=
Measured Sine Wave Power of Port 1
b
=
Measured Sine Wave Power of Port 2
The
Splitter Power Correction
(in dB) is used in the
sections of this document.
Note
Make note of which output port of the power splitter is port 1 and which is port 2.
Refer to the power splitter documentation for information on port designations. Reversing
the connection in the adjustment and verification steps may invalidate the calibration of the
NI 5622.
1
50
Ω
Termination
2
Weinschel WA 1507R Splitter
3
To Signal Generator
4
R&S NRP-Z91 Power Meter
2
S
1
4
1
3
2
10 log
10
×
b
a
---
=
