Test 2-6: AC Flatness - 10 MHz Filter (cont’d)
Test Procedure
(cont’d)
10. Calculate the correction factor that wi ll be use d to r e fer e nc e 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 foll ow ing command:
FREQ <frequency>
where <frequency> is the value sp ecified 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 t o the AFG output frequency.
13. Measure the amplitude with the Power Me te r , 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. Calculat e 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 Te sts Agilent E1445A Serv ice Manual