Keysight Technologies M1749B, Руководство по началу работы, Страница: 25 / 43

Getting Started Guide 25
Exterior Features
DUT-Facing Side
Figure 3-3 M1749B, DUT-facing features
The features are described in the following table.
When attaching cables to threaded connectors on this panel, use a torque
wrench as described in
“Connector Care” on page 15
.
The Cal jumper (see item 2 in the table) should be left permanently in place.
Do not remove the DC input plug from the M1749B while it is in an active state.
Make sure the Status LED on the DUT-facing side of the M1749B is dark
before disconnecting the DC input.
Port/LED Description
(1) RF Tx/Rx 1
(3) RF Tx/Rx 2
These 2.4 mm ports are functionally interchangeable, because the internal switching of the M1749B
can be configured so that either port is the RF output from the Tx upconverter, or the RF input to the
Rx downconverter. These ports communicate with the DUT through an over-the-air interface (OTA),
typically within a test chamber. Torque wrench required.
(2)
Cal
The labeled Cal connector at the upper right is a 2.4 mm port provides a switched output from RF
level detectors within the M1749B; these outputs are used during the calibration process. Torque
wrench required.
The path to the Cal port is routed through an exterior jumper on the front panel; leave it in place.
(4)
RF Tx/Rx1
(6)
RF Tx/Rx 2
These LEDs are lit when the named port is in use.
(5)
Status
This LED is lit to indicate that the M1749B is in an active state (this is determined by inputs received
at the Control port on the instrument-facing side of the M1749B).