Test 2-5: AC Flatness - 250 kHz Filter (cont’d)Test Procedure
(cont’d)
3. Set the AFG output to the reference frequency (1 kHz):
FREQ 1000 Set frequency
4. Measure the amplitude with the DMM and convert the reading to
dBm. Note the result for use in step 6:
Reference Level (dBm) = 20 × log ïReading (volts)ï+13.0103
Perform steps 5 - 6 for each frequency listed in Table 2- 5:
5. Set the AFG output:
FREQ <frequency> Set frequency
where <frequency> is the value sp ecified in Table 2-5.
6. Measure the amplitude with the DMM and convert the reading to
dBm. Calculate and record the erro r relative to the reference level
calculated in step 4:
Reading (dBm) = 20 × log ïReading (volts)ï+13.0103
Error (dB) = Reading (dBm) − Reference Level (dBm)