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PXIe-5185/5186 Calibration Procedure
19. Calculate the splitter imbalance for each frequency point using the following equation:
splitter imbalance
=
splitter output 2 power
-
splitter output 1 power
20. Disconnect the 50
Ω
BNC terminator (f) from splitter output 2. Refer to the remaining
assembly as the
power sensor assembly
. The power sensor assembly will be used in the
Verifying 1 M
Ω
AC Amplitude Accuracy and Bandwidth
procedure.
Verification
This section provides instructions for verifying the PXIe-5185/5186 specifications. Refer to
Table 4 for a list of the verification tests and the equipment needed for each test.
Verifying DC and Programmable Vertical Offset Accuracy
To verify the DC and programmable vertical offset accuracy of the PXIe-5185/5186, compare
the voltage measured by the device and the value sourced by the voltage standard. Table 5 lists
the settings for each channel.
1.
Connect the calibrator test head directly to the channel 0, 50
Ω
input of the
PXIe-5185/5186.
2.
Configure the PXIe-5185/5186 with the following settings:
•
Vertical coupling
: DC
Table 4.
Verification Tests
Test Type
Specification
Recommended
Equipment
50
Ω
1 M
Ω
DC Accuracy
±(2% of Input +
0.35% FS +
0.7 mV)
±1.2% of Offset
Setting
±(2% of Input +
0.9% FS + 1.3 mV)
±1.2% of Offset
Setting
Fluke 9500B
Fluke 9530
AC Amplitude
Accuracy
±0.35 dB
±0.5 dB
Rohde & Schwarz
SMA100A
Rohde & Schwarz
NRP-Z91
Bandwidth (-3 dB)
3 GHz
(PXIe-5185)
5 GHz
(PXIe-5186)
425 MHz
Rohde & Schwarz
SMA100A
Rohde & Schwarz
NRP-Z91
Timebase
Accuracy
±25 ppm
Fluke 9500B
Fluke 9530
*
1 M
Ω
input available on PXIe-5185 module part number 152962
x
-0
z
L and PXIe-5186 module part
number 152961
x
-0
z
L, where
x
is any letter and
z
is any number.