Keithley 236 Service Manual

SECTION
2
Calibration
13. As performed
in steps 8
and
9,
measure the
voltage
across the lOOk2 resistor
and
caiculate
the current.
VlookO
=
VlookO
I9A
=
R100kQ
v
22.
Record
the voltage
measurement
from the Model
193A and caiculate
the
current.
Vko
Vlk2
I9OtA
=
Rlk2
mV
I9RA
IS the characterized
current for the 2OjiA
range
of
the Model
263.
lt is
used to calibrate
the
lOjiA
range
of
the Model
236/237.
Using a pendil,
record the
cal
culated value of
I9LA
in Entry
2
of
Table 2-3.
14.
Place
the Model
263
in standby.
15. In the
test
fixture,
remove the
lOOk2
resistor
and
in-
stall the lk2
resistor
(R-263-lk).
16. On the Model
193A,
select the
Ohms
function,
2k2
range and disable
ZERO.
17.
Repeat step 3
to zero
the Model
193A.
18. Measure and record
the value of
the lk2 resistor.
R 1 =
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
90.000jaA
on
the
200jiA
range and enable
OPERATE.
I9OA
15
the characterized
current
for
the
2OOiA range
of
the
Model 263.
lt is used to
calibrate
the
1OOtA
range
of the
Model
236/237.
Using
a
pendil, record
the
calculated
value
of
I9OA
in
Entry
3
of Table 2-3.
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.
Vike
VlkO
IO9mA
RlkO
v
IO9mA
]S
the characterized
current
for
the 2mA
range
of the
Model 263.
lt is used to
calibrate
the
bnA
range
of
the
Model 236/237,
Using
a
pencil,
record
the
calculated
value
of
IO9mA
in
Entry
4 of Table 2-3.
27. Place
the
Model 263
in standby.
28.
In the
test
fixture,
remove
the
1ki
resistor
and install
the
1OO2
resistor
(R-249-100),
Table 2=3,
Model
263
ISource
Characterization
263
I-Source
Programmed
Characterized
ISource
Entry
Range
Value
ISource
Value
Value
Limits*
1
2jiA
O,9OOOO.tA
IO 9
O,9iA
±45OpA
2
2OjiA
9.000jiA
I 9 A
9iA
±4.3nA
3
200jiA
90,000jaA
I 9 O
9OjiA
±45nA
4
2mA
O,9000mA
Iou
O,9mA
±43OnA
5
2OmA
9.0000mA I 9 mA
The characterized
Isource
values should
be
within
the
listed
limits, These
limits
are
based
on
the
90-day
specifications
of the
Model
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.
25

Keithley 236 Specifications

General

Brand	Keithley
Model	236
Category	Measuring Instruments
Language	English