Technical data

User’s and Service Guide 67
87050A Option K22 Theory of Operation
When a port is not connected, it is automatically terminated in 50 Ω. Only one test port can
be connected to any one of the A i/p ports and only one test port can be connected to any
one of the B i/p ports at any given time.
The test set consists of twelve 1×2 switches, six 1×6 switches, and two 1×4 switches. The
1×2 switches divide each of the input ports (1 through 12) into two separate paths. One of
these paths is open and the other is separated into either the A i/p path or B i/p path.
Two 1×6 switches combine each of the other four 1×6 switches into four banks. These four
banks are divided into two for the forward path ports and two for the reverse path ports.
Finally, the two 1×4 switches recombine the four banks into either the A i/p port or B i/p
port paths.
All switches are mechanical and are biased according to the necessary switching path. A
user interface through the GPIB and parallel ports converts the necessary input signals
from the user to the necessary control signals to control the switching paths.
Connector Replacement
The 50 Ω 3.5 mm connectors are available separately as part number 5062-6618. It is
possible to replace them in the field. A possible alternative to repairing a damaged
connector would be just to replace the center pin components. The components are:
When replacing just the pin and bead, a liquid thread-locking adhesive such as part
number 0470-1590 will be needed. Re-use any shims and spacers from the connector being
replaced. For best results, use a connector gauge to verify pin depth. See Figure 13 on page 44
for proper pin-depth. Add or subtract spacers as required. Spacers and shims are also
available from Agilent Technologies.
Component Agilent
Part Number
3.5 mm Connector RF (complete) 5062-6618
3.5 mm Pin and Bead Assembly (only) 5061-5394