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Table 3.
PXIe-5603 or PXIe-5605 RF Downconverter Module Front Panel Connectors
Connector
Use
RF IN
Connects to the analog RF input signal to be measured by the PXIe-5665.
Note
The PXIe-5603 or PXIe-5605 downconverter module has no
internal DC block. High-frequency components in the
PXIe-5603 or PXIe-5605 can be damaged when DC signals are
applied directly to the RF IN connector. The PXIe-5665 ships with an
SMA DC block attached to the RF IN connector to prevent damage
to the device when a DC input signal is present. The DC block must
be removed to make measurements below 10 kHz. NI recommends
that you keep the DC block attached to the RF IN connector for all
measurements at frequencies greater than or equal to 10 kHz to
maximize the accuracy of the device. If the RF attenuation is set to
0 dB with the DC block attached, an input DC voltage greater than
±2 V may damage the internal components of the downconverter. To
prevent damage to the downconverter, ensure that the DC voltage at
the RF IN connector is between -2 VDC and +2 VDC. With the DC
block removed, the maximum allowed voltage is 0 VDC.
Caution
To reinstall the DC block on the PXIe-5603 or PXIe-5605
RF IN connector, use a torque wrench set to a maximum torque of
0.79 N · m to 1.02 N · m (7 lb · in. to 9 lb · in.). Using more than the
recommended amount of torque may damage the RF IN connector.
IF OUT
Connects to the IF IN connector on the PXIe-5622 module front panel.
This connector is the output terminal for the frequency-translated IF signal. The
IF OUT connector is rated at +22 dBm maximum, 0 VDC. The maximum safe
voltage is 24 VDC.
LO1 IN
Connects to the LO1 OUT connector on the PXIe-5653 module front panel.
This connector is the input terminal for the LO1 (3.2 GHz to 8.3 GHz) source.
LO1 IN is an SMA connector with an impedance of 50 Ω (nominal) and a
maximum safe power level of +15 dBm. The maximum safe voltage is 25 VDC.
LO2 IN
Connects to the LO2 OUT connector on the PXIe-5653 module front panel.
This connector is the input terminal for the LO2 (4 GHz) source. LO2 IN is an
SMA connector with an impedance of 50 Ω (nominal) and a maximum safe
power level of +15 dBm. The maximum safe voltage is 25 VDC.
PXIe-5665 Getting Started Guide
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© National Instruments
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