For greater ac cu racy, cali bra tion fac tors are in ter po lated for set -
tings that are be tween the cali bra tion fac tor data pro vided in the
sen sor EEPROM. For ex am ple, if cali bra tion fac tors ex ist for 1
and 2 GHz , then the cali bra tion fac tor ap plied for 1.5 GHz will be
a value mid way be tween the two.
Sen sor linearity ad just ments for tem pera ture are also in ter po -
lated; If the correction fac tor for 1.5 GHz at 25
° C is 1 dB, and for
35
° C is 1.1 dB, then at 30 ° C a value of 1.05 dB will be used.
Man ual Set
Al lows man ual cor rec tion of sen sor data ei ther as a per cent age or
a fixed dB value. An in put fre quency is also re quired to al low the
cor rect lin ear ity cor rec tion fac tors to be ap plied.
V/ GHz
Most mod ern syn the sized sources have a rear panel BNC con nec -
tor which out puts a volt age pro por tional to the syn the sized fre -
quency. The V/ GHz is sup plied to the rear panel in put con nec tor
of the ML2400A Se ries. The
SETUP sub menu has con trols for
cus tom iz ing the volt age and fre quency re la tion ship.
FREQ
[CFFRQ]
When the Cal Fac tor source is set to Fre quency or manual, en ter
the in put sig nal fre quency in GHz or MHz. The cor rect sen sor
cali bra tion fac tor is auto mati cally in ter po lated and ap plied to the
dis played power read ing.
USE TA BLE
[CFUSEL
CFUTBL
CFUUSE
CFUVLD]
De fines which cal i bra tion fac tor ta ble is to be used. Can be set to
Fac tory, ta ble num ber 1-10, or Fac tory + ta ble num ber. The max -
i mum num ber of ta bles avail able is dis played on the screen, and
is never greater than 10. If a se lected ta ble has not been used be -
fore, the user will be prompted to CLEAR or PRESET the ta ble,
or can cel the se lec tion. If a ta ble is CLEARED, all en tries are
cleared ex cept for a sin gle en try of 100% @ 50 MHz. If a ta ble is
PRESET - the fac tory de fined cal i bra tion fac tor ta ble is cop ied
into the spec i fied user cal i bra tion fac tor ta ble. The CLEARED or
PRESET ta ble is saved di rectly to the sen sor. PRESET clears the
ID string, while CLEAR leaves the ID string as cur rently set.
The num ber of ta bles avail able is de fined by the fre quency range
of the sen sor and the amount of fac tory cal i bra tion data stored.
De lete
De letes the cur rently dis played ta ble number.
ML2400A OM 4-7
OPERATION SENSOR MENU
NOTE
User de fined Cal Fac -
tor ta bles are avail able
for ap pli ca tions where
user-supplied cal i bra -
tion points are re quired.
Ad di tional cal fac tor
fre quen cies can be en -
tered in a user ta ble
and used in con junc -
tion with the fac tory ta -
ble.
NOTE
You will see a live up -
date of the Cur rent Cal
Fac tor only if that sen -
sor is be ing used on a
chan nel. For ex am ple:
If you are ed it ing the
Cal Fac tor Fre quency
on Sen sor B, but you
only have chan nel 1 set
to A and chan nel 2 off,
you will not see the
"Cur rent Cal Fac tor"
be ing up dated.
NOTE
When the MA2499B Anritsu
Sen sor Adapter or the
MA2497A HP Sen sor Adapter
are used, the in put fre quency
should be set to 50 MHz ir re -
spec tive of the mea sure ment
fre quency. Lin ear ity cor rec -
tion fac tors are not ap plied
when the adapt ers are be ing
used.
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