Keithley 236 Service Manual

Table 1-3.
Model
263 I-Source
Characteristics
SECTION 1
Performance
Verification
263
I-Source
Programmed Characterized
I-Source
Entry Range
Value ISource
Value Value
Limits*
2iiA
O9OOOOiA
IO9iA =_________
O.911A
±45OpA
2
2OjiA
9.0000iiA
I 9 iA
9IiA
±4.3nA
3 2OOiA
90.000jiA
I9O
90!iA
±45nA
4
2mA
O.90000mA
Io.&
O.9mA
±43OnA
5 2OmA
9OOOOmA I =_________
9mA
±54!iA
The characterized
Isource values
should
be
within
the
listed limits.
These limits
arc based
on
90-day
specifications
of the
Models
263 and
193A. A characterized
value
that
does
not fall
within these limits
indicates
a
calculation error, or that
the
Model 263
and/or
Model
193A is
out of specification.
Place
the Model
263 in standby.
Set
the Model
193A
to the 2V
range.
Set
the
Model 263
to source 9.0000j.tA
on
the 20j.tA
range
and
enable OPERATE,
13.
As performed
in
steps
8 and 9, measure
the
voltage
across the
lOOk2 resistor and
calculate
the current.
19.
Set
the Model 193A to
DCV
and the
200mV
range,
and
disable
ZERO,
20.
To
cancel any
offset,
zero
the Model 193A
by short
ing
its
input
(VOLTS
HI to
LO)
and
enabling
ZERO.
21. Remove
the short
from the
input of the
Model 193A
and
set
the Model
263
to
source
9O.OOOiA
on the
200j.tA
range
and
enable
OPERATE.
22.
Record the
voltage
measurement
from the
Model
193A and
caiculate the
current.
Vk2 -______________
mV
I9pA
IS
the characterized
current for
the 20j.tA
range of
the
Model
263.
lt is used
to
check the
lOjiA measure
ment
range
of the
Model
236/237.
Using
a
pencil,
re
cord the
calculated
value
of
I9LA
in Entry 2
of
Table I-3.
14. Place
the Model
263
in standby.
15.
In the test
fixture, remove the
1OOk2
resistor
and in-
stall
the
lk2
resistor
(R-263-lk).
6.
On
the Model
193A, select
the Ohms
function,
2k2
range
and
disable
ZERO.
17. Repeat step 3 to
zero the
Model W3A.
18. Measure
and record
the value
of
the
lki2 resistor.
V 1k2
I9OA
11kQ
I9OA
IS
the characterized
current
for the
2OO.tA range
of the
Model
263.
lt is used to
check
the
1OO.tA meas
urement
range ofthe
Model 236/237.
Using
a pendil,
record the
calculated
value of
I9OA
in
Entry
3
of
Table 1-3.
23.
Place the
Model
263
in standby.
24.
Set
the
Model 193A
to
the 2V range.
25.
Set the
Model
263
to
source
O.90000mA
on the 2mA
range, and
enable OPERATE.
26.
Record
the
voltage
measurement
from the Model
193A
and
caiculate
the
current.
IO.9mA
IS
the
characterized
current
for the
2mA range
of
the Model
263.
lt is used to
check
the
1mA meas
urement range
ofthe
Model
236/237.
Using
a pencil,
10.
11
12.
VlOOk2
=
_________________________
V
VlOOk2
I9=
=
Riooi
R=
1c12
15

Keithley 236 Specifications

General

Brand	Keithley
Model	236
Category	Measuring Instruments
Language	English