Agilent Technologies 856290216 service manual Using the TAM, Adjustment Indicator

Using the TAM

The HP 85629B TAM, in conjunction with the HP 8562E/TAM Interface Software (TAM I/F SW), can be used to perform approximately half of the spectrum analyzer adjustment procedures. Table 2-4 lists the TAM adjustments and their corresponding manual adjustments. Refer to Chapter 7, “General Troubleshooting,” for information on loading and running the TAM I/F SW.

The TAM adjustments do not include procedures for choosing factory-selected components. If an adjustment cannot be made and a factory-selected component must be changed, refer to the corresponding manual adjustment.

To select an adjustment, press (m) to display the TAM main menu, then press AMUST. Position the pointer next to the desired adjustment using either the knob or step keys. Press EXECUTE, then follow the instructions displayed on-screen.

Test Equipment

During the TAM adjustments, instructions for setting test equipment controls are displayed.

Table 2-5 lists the test equipment needed to perform each TAM adjustment. Required models must be used. Substitutions may be made for recommended models. Substitute sources must operate over the frequency ranges indicated. Recommended substitutes are listed in the configuration menu. If you must substitute the source with a user-defined model, the adjustments run faster using a synthesized source rather than an unsynthesized source.

Note	When connecting signals from	the HP 8340A/B (or any microwave source)
	to the adjustment, setup, use a high-frequency test cable with minimum
	attenuation to 26.5 GHz. HP	part	number 8120-4921 is recommended for its
	ruggedness, repeatability, and	low	insertion loss.

Adjustment Indicator

To aid in making adjustments, the TAM displays an “Analog Voltmeter Display Box” along the left-hand side of the display. A horizontal line moves inside the box to represent the needle of an analog voltmeter. A digital readout appears below the box. Tick marks are often displayed on the inside edges of the box indicating the desired needle position. (The tick marks and needle are intensified when the needle is within this acceptable region.) During some adjustments, an arrow appears along the right edge of the box. This arrow always indicates the highest position the needle has reached. The arrow is useful when a component must be adjusted for a peak response; if the peak is overshot, the arrow indicates where the peak was. The component can be readjusted until the needle is at the same position as the arrow.

Adjustment Procedures 2-9