Technical data

3 Calibration
26 U2761A Service Guide
Amplitude Flatness (0 dB Range) Verification
This procedure verifies the high frequency AC amplitude
flatness above 100 kHz on the 0 dB range relative to 1 kHz.
1 Connect the power meter to measure the output
amplitude of the U2761A as shown in Figure 3- 4.
2 Set the U2761A based on the following.
• Load impedance: 50 Ω
• Function: Sine wave
• Frequency: 100 kHz
• Amplitude: 350 mVrms (+3.892 dBm)
3 Set the power meter Filter Mode to Auto if you have
previously set it to Manual.
4 On the power meter, use the Relative Power function to set
the current reading as the reference value. This will allow
you to compare future measurement result in dB.
5 Set the power meter Offset to Offset
0dB
value previously
calculated in Table 3- 6. The power meter will directly
read the flatness error specification relative to 1 kHz.
6 Set the U2761A to each output listed in the Table 3- 8.
Measure the output amplitude using the power meter (the
relative measurement in dB).
7 Compare the measured output with the test limits shown
in the Table 3- 8.