- 8 dB flatness verification
This test checks high frequency AC amplitude flatness on the -8 dB attenuator range.
1. Connect the multimeter with a 50 Ω feedthrough to the channel output as shown below.
2. Set the instrument to each output in the table below and configure the multimeter to AC mode. Measure the out-
put voltage with the multimeter. This will become the reference measurement. Set the output impedance to 50
Ω. Be sure the output is enabled.
Waveform Generator
Measurement
Output Load
Function
Amplitude
Frequency
Nominal
Error
50 Ω
Sine
1.200 Vrms
1.00 kHz
1.200 Vrms
±0.024354 Vrms
3. The measured value in Step 2 is the flatness reference point at 1 kHz.
4. Convert multimeter error to ratio using equation below. This value is required for next measurement point.
Reference point accuracy @1 kHz (dB) = 20 x log(multimeter measurement in Vrms / amplitude setting)
5. Set the instrument to the output described in the table below and measure the amplitude by using multimeter.
Without resetting and setting the instrument, remove the multimeter and connect power meter and power
sensor to the channel output as shown below. Then, measure the amplitude by using power meter and power
sensor. Crossover error between both instruments are required to be find out in the following step.
Waveform Generator
Measurement
Output Load
Function
Amplitude
Frequency
Nominal
Error
50 Ω
Sine
1.200 Vrms
100.000 kHz
0 dB
±0.10 dB
20
Keysight EDU33210 Series Service Guide
