Read out Mode In Read out mode, the bot tom text line in the Status box in di cates what type of
cali bra tion fac tors are be ing used. At any time, if any thing other than the fac -
tory sup plied cal data is ap plied, the Status box dis play shows a warn ing ‘*’
sign on the Cal Fac tor line to show that non- standard cali bra tion is be ing ap -
plied. For ex am ple:
CAL F = fre quency cal fac tors us ing fac tory de fined ta ble
CAL V = volts per GHz cal fac tors us ing fac tory de fined ta ble
CAL M = man ual cal fac tor
CAL *F = fre quency cal fac tors em ploy ing a user de fined ta ble
CAL *V = volts per GHz cal fac tors em ploy ing a user de fined ta ble
This is be cause the ap pli ca tion of user cal fac tors can com pletely change the
cali brated re sponse of the Sen sor.
5-15 OPTIMIZING
READINGS
This sec tion pres ents in for ma tion on how to get the fast est read ings from the
ML2400A Se ries power me ter when op er at ing un der GPIB con trol. Re fer to
Chap ter 6, GPIB Op era tion, for spe cific com mand de scrip tions.
The fol low ing GPIB speeds do not ap ply when op er at ing in CDMA mode. In
CDMA mode, read ings are avail able at approximately 10 read ing per sec ond.
Mea sure ment speed de pends greatly on the type of mea sure ments be ing taken,
the power level, and the amount of set tling used.
Us ing the de fault sys tem set up (system pre set), the “O 1” (page 6-58 ) com -
mand is used to re trieve one read ing from chan nel 1 ten times (chan nel 1 =
Sen sor A).
C code ex am ple:
/* Re set the unit */
Send(0, 13, “* RST ”, 4L, NLend );
/* Ask for 10 read ings */
for( i=0; i<10; i++)
{
Send(0, 13, “O 1”, 3L, NLend );
Re ceive(0, 13, buffer[ i], 20, STOPend );
}
Set tling (%) Power Level (dBm) Read ings/Sec ond
0.1 0 150
0.1 –30 150
10.0 –30 150
There are, how ever, meth ods of im prov ing the speed of the mea sure ment with -
out hav ing to change the power level or set tling time.
ML2400A OM 5-21
PROCEDURES OPTIMIZING READINGS
NOTE
All re sults shown in this
sec tion are from DOS
pro grams run ning on a
200 MHz con trol ler us -
ing IEEE 488.2 GPIB
func tion calls. The tim -
ings (read ings/sec ond)
pre sented in this sec -
tion are for il lus tra tive
pur poses only.
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