U9361C/F/G/M RCal Receiver Calibrator Measurement Guide
5
RCal I/O
RCal I/O
The typical RCal use case requires three connections: USB Power & Control, Ext Ref In, and RF Out.
USB Power & Control
RCal has a USB Type-C connector, which must be connected to the signal analyzer for both power
and control. Since RCal needs ample current to operate correctly, be sure to use one of the
following ports:
— The signal analyzer front-panel USB 2.0 port, marked with a lightning bolt symbol (bottom front
panel USB connector closest to RF input connector) or marked in blue (for the N9042B).
— A signal analyzer rear-panel USB 3.0 port, identified with “SS” or having a blue connector.
When plugged in, the RCal module will boot up, accompanied by an LED boot sequence. When
boot-up is complete, the LEDs will settle to Status = Green. For more information about RCal’s LED
codes, see
“LED Indicators on RCal Module” on page 7
External 10 MHz Reference
RCal’s signals are synthesized from an internal 100 MHz clock. For the best possible measurement
accuracy, it is recommended that RCal be connected to the external
10 MHz Ref Out
from the
signal analyzer, or another reference that both RCal and the analyzer are locked to. The default
setting of the RCal is
Ref = External
.