6-14
Performance Tests – Option 011
5. Receiver Channel Noise Floor Level (Only for Analyzers without Option 006)
In Case of
Difficulty
WARNING These servicing instructions are for use by qualified personnel only.
To avoid electrical shock, do not perform any servicing unless you are
qualified to do so.
WARNING The opening of covers or removal of parts is likely to expose
dangerous voltages. Disconnect the instrument from all voltage
sources while it is being opened.
WARNING The power cord is connected to i nternal capacitors that may remain
live for five seconds after disconnecting the plug from its power
supply.
1Check the R sampler assembly by substituting it with the A sampler assembly.
2Move the flexible RF cable (currently connected to the R sampler assembly) to
the A sampler assembly.
3Use a 10 dB attenuator between the RF OUT and the analyzer receiver input A.
4Repeat the test. In Step 4, press MEAS, INPUT PORTS, A.
5If the test still fails, suspect the A11 phase lock board assembly.
5. Receiver Channel Noise Floor Level (Only for Analyzers without Option 006)Perform this test to determine the analyzer receiver cha nnel noise floor levels.
Required
Equipment
Attenuator, 20 dB. . . . . . . . . . . . . . . . . . . . . . . . . . . Agilent 8491A Option 020
Termination (2), 50Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ag ilent 908A
Cable, 50Ω, Type-N, 24 inch . . . . . . . . . . . . . . . . . . . . . . . . . . .Agilent 11851B
Procedure
1Connect the equipment as shown in Figure 6-7.