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Table 3. NI 5606 RF Downconverter Front Panel Connectors
Connector
Use
RF IN
Connects to the analog RF input signal to be measured by the vector signal
analyzer. The maximum RF input is +30 dBm.
Note
The NI 5606 downconverter module has no internal DC
block. High-frequency components in the NI 5606 can be
damaged when DC signals are applied directly to the RF IN
connector. The NI 5606 ships with a 2.92 mm 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 16 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 16 kHz
to maximize the accuracy of the device. 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 NI 5606 RF IN
connector, use a torque wrench set to a maximum torque of
1.65 N · m (15 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 NI 5624R module front panel.
This connector is the output terminal for the frequency-translated IF signal.
LO1 IN
Connects to the LO1 OUT connector on the NI 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).
LO2 IN
Connects to the LO2 OUT connector on the NI 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).
LO3 IN
Connects to the LO3 OUT connector on the NI 5653 module front panel.
This connector is the input terminal for the LO3 (800 MHz) source. LO3
IN is an SMA connector with an impedance of 50 Ω (nominal).
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NI PXIe-5668R Getting Started Guide