de ter mine the at ten u a tion fac tors and use them in ad di tion to the Fac tory cal
fac tors. The num ber of fre quency/cal fac tor data pairs in the fac tory de fined
ta ble de pends on the sen sor be ing used.
The cal fac tor ta bles for a par ticu lar sen sor are not main tained by the me ter,
but are held in the sen sor. This means that when mov ing a sen sor (per haps
with an as so ci ated attenua tor or cali bra tion rec ord) from one me ter to an other,
the cali bra tion stays valid. It is not nec es sary to re- setup the new me ter.
The first time a sen sor is used with the ML2400A Series, a slight de lay may be
ex pe ri enced when the sen sor is first plugged in. This is caused by the firm ware
preparing the sen sor to ac cept user cal fac tor ta bles. Af ter first ini tiali za tion,
user cal fac tor ta bles will have only a sin gle en try at 50 MHz, 100%.
Cal fac tor ta bles are ac cessed through the
Sen sor| Cal Fac tor |USE TABLE front
panel menus (Chap ter 4), or through GPIB com mands (Chap ter 6).
Ex am ple Pro ce dure
Use the key sequence
Sensor|Cal Fac tor|E DIT to get to the table edit menu.
Use the
TABLE key to select the ta ble, then the EDIT key to edit that table.
Press the
INSERT key to enter frequency and cal factor data pairs.
For ex am ple, in or der to en ter the fre quency/cal fac tor pairs 1 GHz @ 100%, 2
GHz @ 101%, 3 GHz @ 98% and 4 GHz @ 98%, step through the keys in the
fol low ing sequence:
FREQ , 1, GHz .Entr
FAC TOR, 100, %
FREQ , 2, GHz . Entr
FAC TOR, 101, %
FREQ , 3, GHz . Entr
FAC TOR, 98, %
FREQ , 4, GHz . Entr
DONE
The fre quency/cal fac tor pairs can be en tered in any or der. Each time a new
fre quency is en tered, a new data pair is formed. As the data pairs are en tered,
they are sorted into fre quency as cend ing or der.
5-20 ML2400A OM
USER CAL FACTORS PROCEDURES
ML2400A
Sensor CalFactor -more-
USE TA BLE
%/dB
EDIT
Figure 5-4. Cal Fac tor Ta ble Key Sequence
NOTE
A * in the dis played sta -
tus box by the Cal Fac -
tor in di ca tor, sig ni fies
User Cal Fac tors are
ac tive.
User Cal Fac tors are
main tained in the sen -
sor.
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