Section 1: Verification procedures 3390 50 kHz Arbitrary Waveform / Function Generator Verification and Adjustment Manual
1-10
3390-905-01Rev. B / May 2016
Ch10 dB range flatness
This procedure checks the high frequency AC amplitude flatness above 100 KHz on the +10 dB
attenuator range. Flatness is relative to 1 KHz.
1. Connect the power meter to measure the output amplitude of the instrument.
2. To set up the function generator press
Utility,
select
Output setup
, and make the following
settings:
Output impedance: 50 Ω
Waveform: Sine
Frequency: 100 KHz
Amplitude: 13 dBm
3. Make sure that the output is enabled.
4. On the power meter, use the Relative Power function to set the current reading as the reference
value. This allows you to compare future measurement results in dB.
5. Set the power meter offset to equal the 100kHz_10dB_offset value previously calculated. This
sets the power meter to read the flatness error specification relative to 1 kHz.
100kHz_10dB_offset is calculated on the Amplitude and Flatness Verification Worksheet.
6. Set the 3390 to each output described in the table below and measure the output amplitude with
the power meter (the relative measurement in dB).
Keithley Instruments 3390
Measurement
Output setup
Function
Amplitude
Frequency
Nominal
Error
50 Ω
Sine wave
+12 dBm
100.000 KHz
0 dB
±0.1 dB
50 Ω
Sine wave
+12 dBm
500.000 KHz
0 dB
±0.15 dB
50 Ω
Sine wave
+12 dBm
1.000 MHz
0 dB
±0.15 dB
50 Ω
Sine wave
+12 dBm
5.000 MHz
0 dB
±0.15 dB
50 Ω
Sine wave
+12 dBm
10.000 MHz
0 dB
±0.3 dB
5
0 Ω
Sine wave
+12 dBm
15.000 MHz
0 dB
±0.3 dB
50 Ω
Sine wave
+12 dBm
17.000 MHz
0 dB
±0.3 dB
50 Ω
Sine wave
+12 dBm
20.000 MHz
0 dB
±0.3 dB
50 Ω
Sine wave
+12 dBm
25.000 MHz
0 dB
±0.5 dB
50 Ω
Sine wave
+12 dBm
29.000 MHz
0 dB
±0.5 dB
50 Ω
Sine wave
+12 dBm
37.000 MHz
0 dB
±0.5 dB
50 Ω
Sine wave
+12 dBm
47.000 MHz
0 dB
±.5 dB
50 Ω
Sine wave
+12 dBm
50.000 MHz
0 dB
±0.5 dB
7. Compare the measured output to the test limits shown in the table.
