Agilent Technologies AGILENT U2761A Instrukcja Obsługi Pobierz pdf (Strona 55)

Calibration 3

U2761A Service Guide 41

Amplitude Flatness (+20 dB Range) Adjustment

This procedure calibrates the AC amplitude flatness for high

frequency using +20 dB amplifier. This calibration is

performed using Sine wave at nominal amplitude of

400 mVrms across 50

Ω load.

1 Connect the power meter to measure the output

amplitude of the U2761A as shown in Figure 3- 4.

2 Set the power meter Filter Mode to Auto if you have

previously set it to Manual.

3 Use the power meter to perform a 100 kHz AC power

measurement at the output terminal for setup 89 in

Table 3- 19. Setup 89 establishes the power reference for

all the remaining setups in Table 3- 19. You must always

perform setup 89 before any of the following setups.

4 On the power meter, use the Relative Power function to set

the current reading as the reference value. This will allow

you to make future measurement result in dB.

5 Set the power meter Offset to Offset

+20dB

value previously

calculated in Table 3- 14. The power meter will directly

read the flatness error specification relative to 1 kHz.

6 Enter the measured value to the U2761A as described in

“Calibration Procedure” on page 30.

NOTE

This is the final adjustment procedure for the U2761A.

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Agilent Technologies AGILENT U2761A Instrukcja Obsługi Strona 55