HP 75000 C Series Service Manual page 41

15. Set the HP E1426A controls as follows:
Reset HP E1426A
...............................................
*RST
Time base
to
2psec
...............................
T I M W G 2E-6
Turn on channel 1
...................................
VIEW CHANl
.....
Turn off unused channels BLAN CHAN2,CHAN3,CHAN4
Channel
1
to DC
at 50Q
.......................
CHAN1:COUP DCF
Trigger source to channel
1
................
TR1G:SOUR CHANl
.....................
Acquisition type to average ACQ:TYP AVER
Acquisition count to 32
.............................
ACQ:COUN 32
Channel
1
range to 40 mV
...................
CHAN1:RANG 4E-2
Measure channel
1
.........................
MEAS:SOUR CHANl
Digitize channel 1
.....................................
DIG CHANl
Measure peak-to-peak voltage
.......................
MEAS:VPP?
16. Record the measured peak-to-peak voltage.
V
1
MHz
=
17. Set the Power Meter controls as follows:
..................
Calibration Factor
to
power sensor
1
MHz value
................................
Press dB REF to set a 0 dB reference
...............
Calibration Factor
to
power sensor 500 MHz value
18. Set the Signal Generator frequency to 500 MHz, then a 4 u s t the output
level for a power meter reading a s close as possible to 0.0 dB (REL).
Record the reading.
Power Meter
=
19. Set the HP E1426A controls as follows:
.............................
Time base to 5 nsec..
T1M:RANG 5E-9
.....................................
Digitize channel 1 DIG CHANl
.......................
Measure peak-to-peak voltage MEAS:VPP?
20. Record the measured peak-to-peak voltage.
V 500 MHz =
21. Calculate the response from the measured results in steps 16 and 20
using the following formula:
VSOOMHZ
response(dB)
-
20
loglo
-
2obgl0
I
dB
V1 MHz
22. Correct the result from step 21 with any difference in the power meter
reading from step 18 using the following formula. Observe signs.
( step21)-( step18)-
dB
23. Verify the result in step 22 is H . 5 dB.
24. Connect the power splitter to next channel being tested. Repeat steps
14 through 24 for channels 2,3, and 4.
25. Disconnect test equipment.
4-16
Verification Tests