Model 6487 Reference Manual
Measurement Concepts and Connections
2-15
The 2V analog output signal is not corrected during calibration. Gain errors of up to 2.5%
may appear at this output, depending on range.
The output impedance is <100¾. To minimize the effects of loading, the input impedance
of the device connected to the ANALOG OUT should be as high as possible. For example,
for a device that has an input impedance of 1M¾, the error due to loading will be approxi-
mately 0.01%. High capacitance connected to the analog output will increase the rise time.
An internal 1k¾ resistance is connected between COM and analog common for protec-
tion. The effects of this resistance on analog output accuracy are negligible.
Rel and the result of mX+b, m/X+b, or LOG have no affect on the analog output. The 2V
analog output is scaled only to the actual input.
Figure 2-11
Typical analog output connections
Te
st
Lea
d
120
LINE RATING
50, 60Hz
50 VA MAX
INPUT
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU)
IEEE-488
CAT
I
TRIGGER LINK
RS-232
MADE IN
U.S.A.
ANALOG OUT
DIGITAL I/O
INTERLOCK
505V
MAX
V-SOURCE OUTPUT
505V PK TO CHASSIS
LO
HI
!
!
FUSE
LINE
400mAT
(SB)
100 VAC
120 VAC
200mAT
(SB)
220 VAC
240 VAC
505V PK
505V PK
505V PK
*
1k
Ω
inclu
d
e
d
f
o
r
p
r
o
t
ec
t
ion.
Vi
rt
ually 0
Ω
f
o
r
accu
r
acy pu
r
po
s
e
s
.
Mo
d
el 6487 Rea
r
Panel
R
L
= Inpu
t
Re
s
i
st
ance o
f
mea
s
u
r
in
g
d
evice
Inpu
t
fr
om
P
r
e
s
cale
r
COM
A
+
-
A
<100
Ω
Mea
s
u
r
in
g
Device
(i.e. Cha
rt
r
eco
rd
e
r
)
Analo
g
Ou
t
pu
t
A. Connec
t
ion
s
LO
HI
B. Equivalen
t
Ci
r
cui
t
Mo
d
el 6487
1k
Ω∗
