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Section IV
Model3490A
SAMPLE/HOLD MEASUNEMENl
SEOUENC€. NOT
OFAWN
TO
TIME
Oß VOLTAGE
SCA!E.
MAIN
TIME BITS C 8A
{TO
N SWrrCHrNG)
NOBMAL MESUßEü€NT
SAMPLE/HOLD MEASUßEMENT
NOTE
3
HOLO
HOLDACOMMANO
IHHDAI TRÄCX
c8a
@
11i
011
il!
IO
il0
r10
0r0
0t0
111
INPUI
AMPLIFI€R
SHORTEO
Ll--
rrpur
lueuFrER sHoRTEo
I
HOLD BCOMMAND
IHHDBI
IRACK/HOLD
9H IRIGGER
42701
GATE
VAAYING INPUT
VOLTAGE
I
I
-F--
ill
Ul
--j
i
s
+enrune
rlME=4mBüAX
R€F!RErcE
VOLTAGE
MLIED
AT THIS
POINT
STEP INPUT
NOr€S
RESPONSE
HOLD
FEF.
ll
It
*$-c-3$a
r
SAMPLE/HOLD
WILL ACCEPf
AN
EXTEFNAT
TRIGGER
COMMANO
AT ANY
TIME
DURING
THIS PERIOO.
PEFIOD
ENOS
ANO HOLD
MOOE
BEGINS
N SHOWN.
2. tf
g$a
rs
t(
HoLD
tFoß
€XAMPL€,
SAM.
pLE
FATE
s€T
To aoLD'
aND aN
ExTEANAL
ENCODE
COMMAND
WAS NOT
APPIIEO
DUR-
rNG
TH€ PBEVTOUS
pERlOO.
A9OA WAtS aO8
AN
ENCOOE
COMMANO
SEFOBE
GOING TO
NEXT PERIOO
AND PfiOCEEDING
WITH MEA.
SUREMENT.
3, MAIN
TIME
SIT
STATES
SHOWN
FOR
NOA.
MAL
MEASUFEMENT
ARE THE
STAfES
OF
TXES€
SIGNALS
AS APPLIEO
TO THE
SAMPLE/
HOLO
L@IC.
TIME
8IT SE@ENCE IS
THEN
MODIFIEO
IO THE
SfATES
SHOWN FOR
SAM,
PL€/HOIO
MEASUR€MENTS.
ortoroo.,
I
J
l- oruY
--Jl
;
ri--
Figurb 4-30.
Sample/Hold
Measurement
Sequence.
j-tE