Keithley 237

2.
Set
the
Model193A to
the
2V
de
range.
3. Zero
the
Model 193A
by
shorting its
input
(VOLTS
m
to
LO),
and
enabling
ZERO.
4.
Remove the
short
from
the
input
of
the Model193A
and
set
the
calibration source (Models 343A
and
2500E) to
output
OmA.
5. Place
the
Model236/237
in
operate
and
record
the
voltage measurement from
the
Model193A
in
the
space below:
VOmA
=
-------
V
6.
Calculate
the
actual current
through
the
resistor as
follows:
VOmA
lornA=
--
=
mA
R10a
-------
7.
Verify
that
the
current reading
(b)
on
the
Model
236/237 is
within
the
following limits:
1236
=
lornA
±6J.IA
8.
Set
the
calibration source to
output
+90mA.
9.
Record
the
voltage from the Model193A
and
calcu-
late
the
a<rtual
current.
v
+90mA
=
------
v
l+90mA
=
v
+90mA
=
mA
Rtoa
-------
10.
Verify
that
the
current reading
(!236)
on
the
Model
236/237 is
within
the
following limits:
1236
=
I+90mA
±{(0.0008)
I.90mA
+6J.IA}
11. Set
the
calibration source to
output
-90mA.
12. Record the voltage from the Model193A
and
calcu-
late the actual current.
v.J}QmA=
______
v
v.J}QmA
mA
~
=
_R_t_oa_
--------
+
+
APPENDIXF
236/237
Perfonnance
Verification
13. Verify
that
the
current reading
(1236)
on
the
Model
236/237 is
within
the
following limits:
1236
=
I.J}QmA
±{
(0.0008)
l-90mA
+6J.IA}
14.
Place
the
Models 343A
and
236/237
in
standby.
F.5.9
1
OOmA
Source
Range Verification
Set
up
the
equipment
as
shown
in
Figure F-9. The
100
re-
sistor (R-185-10) is installed
in
the
test socket.
This
procedure
requires
the
characterized value of the
100
resistor for current calculations. The characterized
value
of
this resistor
was
previously recorded
in
step 43
of
paragraph
F.5.1
and
also
used
in
the previous para-
graph. Transfer
that
resistance value to
the
space pro-
vided
below:
Rtoa
=
-------0
Perform
the
following steps to verify the
lOOmA
source
range:
1.
While
in
standby, set the
Model236/237
to source
OmA
on
the
100mA
source range
and
set compliance
to 1.1V.
2.
Set
the
Model193A to
the
2V de range.
3. Zero
the
Model193A
by
shorting its
input
(VOLTS
I-ll
to
LO),
and
enabling
ZERO.
4.
Remove
the
short from
the
input
of
the
Model193A.
5. Place
the
Model236/237
in
operate
and
record
the
voltage measurement from
the
Model 193A
in
the
space below:
VOmA
=
-------
V
6.
Calculate
the
actual current
through
the
resistor as
follows:
lornA=
VOmA
--
=
_______
mA
Rtoa
7.
Verify
that
the
actual current
(lornA)
is
within
the fol-
lowing limits:
lOmA
=
OmA
±20J.IA
8. Set
the
Model236/237
to
output
+90mA.
F-19