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Keithley 237

Keithley 237
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APPENDIXF
236/237
Performance
Verification
7.
Set
the
Model263
to
output
+0.90000nA
on
the
2nA
range,
and
set
the
Model
'236/237
compliance
limit
to
lnA
on
the
lnA
measurement
range.
larity
and
verify
that
the
reading
is
within
the
limits
specified
in
the
table.
8. Verify
that
the
reading
is
within
the
limits
specified
in
the
table.
10.
Using
Table
F-7
as
a
guide,
check
the
lOnA
through
lOrnA
measurement
ranges
of
the
Model
'236/237.
9.
On
the
Model263,
change
the
output
to
negative
po-
0
0
Ground
Unk
Removed
l
~~o~=kp
263 Source
(Source
I)
Note
: 263 GUARD enabled
6172
2·Siot
to 3-Lug
Female Triax adapter
7078-TRX
Cable
11.
Place
the
Model263
in
standby.
236/237 (Measure
I}
FigureF-6.
Setup
for
Low
Current
Measure
Ranges
Verification
(1nA
to
10mA)
Table
F-6.
Allowable
Reading
Calculations
for
Low
Current
Measure
Verification
(lJ.lA
to
lOmA)
236/237
Measure
Range
1~
10~
100~
lmA
lOrnA
Allowable
Reading**
Typical
Reading
Calculations*
Lower
Limit
Upper
Limit
Limits***
+lo.9v.A
± [ (0.0004)
Io.911A
+
60pA]
=
+_.
_____
~
+_.
_____
~
+0.90000~
±870pA
-Io.911A
± [ (0.0004)
Io.9v.A
+
60pA
]
=
-
_.
_____
J..lA
--·-----~
-0.90000~
±870pA
+l911A
± [ (0.00035)
l9v.A
+
700pA]
=
+_.
____
~
+_.
____
~
+9.0000~
±8nA
-I911A
± [ (0.00035)
I911A
+
700pA
]
=
--·----~ --·----~
-9.0000~
±8nA
+l9011A
± [ (0.00035)
l9011A
+
6nA
]
=
+
__
·---~
+
__
·---~
+90.000~
±83nA
-I9011A
± [
(0.00035)
I9011A
+
6nA
]
=
---·---~
---·---~
-90.000~
±83nA
+Io.9mA
± [
(0.00035)
Io.9mA
+
60nA]
= + _ _
____
mA
+ _ _
____
mA
+0.90000mA ±800nA
-Io.9mA
± [
(0.00035)
Io.9mA
+
60nA
]
=
--
-----
mA
--
-----
mA
-0.90000mA
±800nA
+l9mA
± [ (0.00038)
19mA
+
600nA
]
=
-I9mA
± [ (0.00038)
19mA
+
600nA
]
=
+
_____
mA
-
_____
mA
+_.
____
mA
-
_____
mA
+9.0000mA
±9.4~
-9.0000mA±9.4~
*
lo.9J!A,
lgpA,
ICJOp.A,
lo.9mA
and
19mA
are
obtained from Table F-3.
**
Allowable reading limits
are
to
be
transferred
to
Table F-7.
***
The
calculated allowable readings
should
be
within
the
listed typical limits. These limits
are
based
on
the
90-day
specifications
of
the
Model263
and
193A. A calculated allowable
reading
that
does
not
fall
within
these limits indicates a calculation
error,
or
that
the
Model
263
and/
or
Model193A
is
out
of
specification.
+
F-13

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