28
|
ni.com
|
NI PXIe-5694 Calibration Procedure
4.
Set RF source 1 to the first frequency listed in the
RF Source 1 Frequency
column of
Table 8 corresponding to the configured device instantaneous bandwidth.
5.
Set the RF source 1 output power to the appropriate characterized power recorded in
Table 2 for the configured RF source 1 frequency and a device under test (DUT) input
power of 0 dBm.
6.
Set RF source 2 to the frequency listed in the
RF Source 2 Frequency
column of Table 8
corresponding to the configured RF source 1 frequency.
7.
Set the RF source 2 output power to the characterized power recorded in Table 3
corresponding to the configured RF source 2 frequency and a DUT input power of 0 dBm.
8.
Use the following equation to compute the IF OUT power and record the result in the
corresponding cell in the
IF OUT Power
column in Table 8.
IF OUT Power
=
P
SA
-
P
CORR
where:
P
SA
= Power reported by the spectrum analyzer
P
CORR
= Characterized correction (dB) recorded in Table 4 for the frequency
193.6 MHz
9.
Repeat steps 3 through 8 for each of the remaining combinations of device instantaneous
bandwidth, RF source 1 frequency, and RF source 2 frequency listed in Table 8.
10. Calculate the TOI-OB for the configured RF source 1 and RF source 2 frequencies using
the following formula. Record the result in the corresponding cell in the
TOI-OB
cell in
Table 8.
where:
TOI
OB
= TOI out-of-band in dBm
P
IN
= Configured DUT input power, in this case 0 dBm
P
OIMD
= The greater of the two values recorded in the
IF OUT Power
column in
Table 8 for the configured device instantaneous bandwidth
G
K
= The value recorded in the
Path Gain
column in Table 6 for the configured
device instantaneous bandwidth with step gain disabled
11. Repeat step 10 for each combination of frequencies listed in Table 8.
12. Reconfigure the NI 5694, enabling step gain.
TOI
OB
P
IN
P
IN
P
OIMD
G
K
–
(
)
–
2
--------------------------------------------------
+
=
