Agilent Technologies E1401-90493

340 Chapter 2

Performance Verification Tests

42. Tracking Generator Absolute Amplitude and Vernier Accuracy: Agilent E4402B, E4403B,

E4404B, E4405B, E4407B, and E4408B (Option 1DN)

42. Tracking Generator Absolute Amplitude

A calibrated power sensor is connected to the tracking generator output

to measure the power level at 50 MHz.

The power meter is set to relative mode so that future power level

readings are in dB relative to the reference power level setting. The

output power level setting is decreased in 1 dB steps and the power

level is measured at each step. The difference between the ideal and

actual power levels is calculated at each step.

Since a power sweep is accomplished by stepping through the vernier

settings, the peak-to-peak variation of the vernier accuracy is equal to

the power sweep accuracy.

The related adjustment for this performance test is the front panel

Align Now, TG (Ext Cable) under the System, Alignments menu.

Equipment Required

Power meter, compatible with power sensor

Power sensor, 50 Ω

Procedure

1. Press Preset on the analyzer. Press the Factory Preset softkey, if it is

displayed. Set the analyzer by pressing the following keys:

FREQUENCY, Center Freq, 50 MHz

SPAN, Zero Span

AMPLITUDE, 0 dBm

System, Alignments, Auto Align, Off

Source Amptd, Amplitude (On), –20 dBm

Source Amptd, Attenuation (Man), 16 dB

Single Sweep

2. Zero and calibrate the power meter and power sensor in log mode

(power reads out in dBm), as described in the power meter operation

manual. Enter the 50 MHz Cal Factor of the power sensor into the

power meter.

3. Connect the 50 Ω power sensor to the RF output as shown in Figure

2-60.

Figure 2-60 Absolute Amplitude, Vernier, and Power Sweep Accuracy Test