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Test 2-6: AC Flatness - 10 MHz Filter (cont’d)
Test Procedure
(cont’d)
10. Calculate the correction factor that will be used to reference the
Power Meter to the DMM:
Correction Factor =
DMM reading at 100 kHz (step 6)
Power Meter reading at 100 kHz (step 9)
Repeat 11 - 14 for each frequency in Table 2-6:
11. Set the AFG output to the frequency specified in Table 2-6. If the
frequency is less than 10.8 MHz, use the following command:
FREQ <frequency>
where <frequency> is the value specified in Table 2-6. If the
frequency is 10.8 MHz, use the following register commands to set
the output frequency:
DIAG:POKE #HE000A1,8,0
DIAG:POKE #HE000A3,8,126
DIAG:POKE #HE000A5,8,95
DIAG:POKE #HE000A7,8,64
DIAG:POKE #HE0008D,8,0
12.
Set the Power Meter expected frequency to the AFG output frequency.
13. Measure the amplitude with the Power Meter, convert the reading to
volts, and multiply by the correction factor.
Reading (volts) =(
√
ïReading (watts) ï × 50 )
Corrected Reading (volts) = Reading (volts) × C.F. (step 10)
14.
Convert the reading to dBm. Calculate and record the error relative
to the reference level calculated in step 4:
Reading (dBm) = 20 × log ïCorrected Reading (volts)ï +13.0103
Error (dB) = Reading (dBm) − Reference Level (dBm)
54 Verification Tests Agilent E1445A Service Manual