HP 70340A, User Manual

Page: 90 / 445

The signal generator no w uses the atness correction data to adjust the RF output
amplitude so that the displa y ed p o w er lev el is the lev el at the external p ort, not at the
RF Output connector . The correction is active for an y p o w er lev el and an y frequency
within the calibrated frequency range.
17. Disconnect the p o w er meter and p o w er sensor from the external signal path.
Notes
1. The data stored in non-v olatile memory is only b e v alid for the curren t
external signal path. If the external signal path is c hanged, the
CALIBRA TE FLA TNESS CORRECTION routine m ust b e run again.
2. Y ou can ab ort the CALIBRA TE FLA TNESS CORRECTION while it is
running b y selecting the
NNNNNNNNNNNNNNNNN
ABORT softkey .
Programming Example
During the atness correction routine, the signal generator m ust act as a con troller.
Therefore, it is not p ossible for another system con troller to initiate a atness correction
routine. The follo wing program can b e used to gather atness correction data externally , then
load the collected data in to one of the signal generator atness correction tables.
10 DIM Frequencies(1:401) Dimensions fr e quency arr ay.
20 DIM Losses(1:401) Dimensions c orr e ction factor arr ay.
30 signal generator=719 Sets signal gener ator addr ess variable to 719.
40 Power_meter=713 Sets p ower meter addr ess variable to 719.
50 PRINT "CHOOSE THE START FREQUENCY IN GHZ (1.654321 FOR
EXAMPLE)"
60 ENTER KBD;Start_freq
Enters start fr e quency into variable Start fr e q.
70 PRINT "CHOOSE THE STOP FREQUENCY IN GHZ (15.123456 FOR
EXAMPLE)"
80 ENTER KBD;Stop_freq
Enters stop fr e quency into variable Stop fr e q.
90 PRINT "CHOOSE THE NUMBER OF POINTS (2 TO 401)"
100 ENTER KBD;Points
Enters numb er of p oints into variable Points.
110 PRINT "CHOOSE THE LEVEL CORRECTION TABLE TO STORE DATA
INTO (1 TO 4)"
120 ENTER KBD;Table_num
Enters c orr e ction table numb er into variable T a-
ble num.
130 PRINT "CHOOSE THE SIGNAL GENERATOR POWER LEVEL TO USE
DURING ";
140 PRINT "THE LEVEL CORRECTION"
150 PRINT "( 03.32 FOR EXAMPLE)"
160 ENTER KBD;Power_level
Enters p ower level into variable Power lev.
170 OUTPUT signal generator; "*RST" Pr esets the signal gener ator.
180 OUTPUT signal generator; "POW ";Power_level Sets signal gener ator p ower level to the enter e d
value.
190 OUTPUT Power_meter; "*RST" Pr esets the p ower meter.
200 OUTPUT Power_meter; "FM 32 EN" Sets numb er of aver ages.
210 OUTPUT Power_meter; "TR0" Sets p ower meter to trigger hold mo de.
220 Step_freq=(Stop_freq-Start_freq)/(Points-1) Calculates the fr e quency step.
230 Current_freq=Start_freq Sets rst fr e quency in arr ay to start fr e quency.
240 FOR I=1 TO Points
250 Frequencies(I)=Current_freq
Stor es curr ent fr e quency in arr ay.
260 OUTPUT signal generator; "FREQ ";Current_freq;" GHZ" Sets signal gener ator fr e quency to the curr ent
fr e quency in arr ay.
270 OUTPUT Power_meter; "FR ";Current_freq;" GZ" Sets p ower meter fr e quency to the curr ent fr e-
quency in arr ay.
280 OUTPUT Power_meter; "TR2" Sets p ower meter to trigger with delay.
290 WAIT 5 Waits ve se c onds for p ower meter to settle.
3-38 Generating Signals
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