A1 Bulkhead (Diode Sensors); A2 Power Sensor Board Assembly - Agilent Technologies 8480 Series Operating And Service Manual

Coaxial power sensors

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Table 3-1

CAUTION

Step 1. Disconnect all cables from the Power Sensor.

Step 2. Remove the clamp holding the two gold wires.

Step 3. Connect the Precision 30dB Attenuator to the 1mW Power Reference connector on

Step 4. Connect the Power Sensor to the Precision 30dB Attenuator.

NOTE

Step 5. Turn on the 1mW Power Reference, and measure the voltage across the two gold

Bulkhead Assembly Resistance

Model

8481A, 8481B, 8481H, 8485A, 8487A:

8482A, 8482B, 8482H:

8483A:

If the resistance value is incorrect (failure is usually indicated by an open circuit),

then the A1 Bulkhead Assembly is defective. If the resistance is correct then

continue to test the A2 Power Sensor Board Assembly.

A1 Bulkhead (Diode Sensors)

Disconnect the gold wires from the A2 assembly before measuring the voltage. Be

extremely careful when measuring across the gold wires. They are delicate and can

be damaged easily.

the power meter.

Models 8485A and 8487A require 3.5mm and 2.4mm adapters respectively.

wires. The voltage should be between 0.9mV and 1.5mV. If the voltage is incorrect,

then the A1 Bulkhead Assembly is defective. If the voltage is correct then continue

to test the A2 Power Sensor Board Assembly.

It is extremely rare for the A2 Assembly to fail. Eliminate the power meter, the

sensor cable, and the A1 Bulkhead Assembly before suspecting the A2 Assembly.

Measured Resistance

200 Ohms ± 10 Ohms

245 Ohms ± 12.5 Ohms

375 Ohms ± 17.5 Ohms

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