Filter
Top Products
Model3490A
g.
Set
oscilloscope
main sweep to .5 ms/div.
h. Adjust
function
generator
frequency
to
200H2,
output level
to
2
V
peak-to-peak.
i.
Set
349OARANGE
to
I V.
j.
Adjust intensified trace to
approximately
I
ms
after the negative-going
edge of
square wave.
Note
reading, which should
be near zero.
k.
Adjust intensified
trace to
approximately
500
ps
after the
negative-going
edge
of square
wave.
Reading
should
be within
t
0.001 V of
reading noted
in step
j.
536.
RATI0
PEBF0BMANCE
(0ption
080).
5-37.
The dc
and ac
voltage
measurement performance
of the
3490A
must
be
within
specifications
before
proceeding
with
the
ratio performance
tests.
Refer
to
Paragraphs
5-9
and 5-l
l.
$38. DC/DC
Ratio
Accuracy
Tests.
5-39.
Preferred
Method.
Two
dc standards
(-hp-
7a0B)
are
necessary
for
this
method,
making
it possible
to
check performance
at various
levels
of EXT
REF
voltage
and INPUT
voltage.
Both
dc standards
must
be floating,
since
IMUT
Low and EXT
REF
Low
terminals
are
connected
internally.
If
only one
dc standard
is
availa-
ble,
go
to
Paragraph
540.
a.
Set 3490A
RATIO
switch
to
EXT
REF
I
V.
Connect
a
dc
standard
to
3490A
INPUT
terminals
and
adjust
standard
output
to
+
0.10000 V.
b.
Set 349OA
FUNCTION
to
DC,
RANGE
to
1
V.
Connect
a second
dc standard
to
3490A
IMUT
termi_
nals
and
adjust standard
output
to
+
g.lgggg
V. 3490A
display should
be
+
0.99955 to
+
1.00045.
c.
Select
EXT
REF
and
INPUT
ranges
and
voltages
listed
in
Table
5-7. Display
should
be within limits
shovm
in each case.
540. Alternate
Method.
A dc standard (-hp-
74OB)
and
a second
voltage
source
having
an output
of
l0
V
+
5
%,
stable
to
within I
mV/hr,
are required
for
this
method.
Both
the
dc
standard
and the
second
voltage
source
must
be
floating.
A
9.8 V
mercury
battery
(Mallory
TN77)
is
.e
satisfaQtory
source.
The
following procedure
will
refer
"
to
the secgnd
voltage
source
as the
battery.
a.
Set
34904
RATIO
switch
to INT
REF.
FUNC_
TION
to
DC,
RANGE
to
10
V.
PERFOHMANCE
CHECKS
Section
V
FUNTION
GENERATOR
hp
3310A/B
OSCILLOSCOPE
hp lSOD
PLI.JG
IN
PLUG
IN
hp
l80lA
hp
l82lA
OELAYED
GATE
OUTPUI
TO
SAMPLE/HOLD
AC
TRIGGER
INPUT
Figure
$7.
Sample/Hold
Response
Test.
Table 5-7.
DC/DC
Ratio Accuracy
Test.
Ext
Ref
Range
Ext
Ref
Voltage
Input
Range
Input
Voltage
Display
Limits
1V
1V
1V
1V
1V
1V
1V
10v
10v
10v
10v
+
0.10000 v
'+
0.50000
v
+
1.00000v
+
1.00000
v
-
1.00000 v
-
1.00000 v
+
1.20000
v
+
1.00000 v
+
5.00000
v
+
10.0000
v
+
12.0000
v
1V
1V
1V
1V
1V
1V
1V
10v
10v
100
v
100
v
+
0.10000
v
+
0.50000
v
+
1.00000 v
-
1.00000 v
-
1.00000 v
+
1.00000
v
+
1.00000
v
+
1.00000
v
+
5.00000 v
+
100.000
v
+
100.000
v
+
0.99955
to
+
1.00045
+
0.99979
to
+
1.00021
+
0.99982
to
+
1
.00018
-
0.99982to-
1.00018
+
0.99982
to
+
1.00otg
-
0.999821o-
1.00018
+
0.83316
to
+
0.83350
+
09.9955
to
+
10.0045
+
09.9979
to
+
10.0021
+
099.979
to
+
100.021
+
083.31
3
to
+
083.353
5-7