Keithley 237 - PRECAUZIONI DI SICUREZZA

Model 238 Source Measure
Unit
Specifications
SOURCE-MEASURE
UNIT: Sources voltage while measuring current,
or
sources current while measuring voltage.
FUNCTION:
Can
be
used as DC source
or
meter, sweep source,
or
full
source-measure unit.
SOURCE-DELAY-MEASURE
CYCLE:
Source
Value
j
___
_
Source-Delay-Measure Cycle
_L
I
Default
Delay
I
I
Measure
Delay
Integration
Time
Default Delay: Fixed delay for instrument settling.
I
User
Delay: Additional delay for device
under
test
or
system capaci-
tance.
MEASURE:
Integration Time:
Fast
Medium
Line Cycle
416
JlSeC·
4
msec.
16.67 msec.
(60
Hz)
20.00
msec.
(50
Hz)
4-digit resolution
5-digit resolution
5-digit resolution
Elapsed Time: Measures
and
stores time from sweep trigger to mea-
surement complete for each step of sweep.
RANGING:
Source: Auto-ranging through keypad entry; fixed range selection using
rotary dial
and
SELEcr
keys (DC function). Fully programmable in
SWEEP
function.
Measure: Auto
or
fixed range. Fixed range selection
made
by
choice of
COMPLIANCE value.
FILTER: Takes n measurements, calculates
and
outputs average (n
=
2,
4,
8,
16,
or
32, selectable).
SUPPRESS: Subtracts
displayed measurement from subsequent readings.
MENU:
DC Measurement Delay, Default Delay
On/Off, Local/Remote
Sense,
50/60Hz,
IEEE
Address, Self Tests.
DATA ENTRY: Numeric keypad
or
detented rotary dial.
TRIGGER:
Input
and
Output:
Set for
any
phase
of
SOURCE-DELAY-MEASURE
sequence
or
trigger
output
at
end
of
sweep.
Origin:
Internal, External (including front panel
MANUAL
TRIGGER
button),
IEEE-488
bus
(TALK,
GET,
"X").
MEMORY: Stores
one full sweep
(up
to 1000 points)
of
source, delay,
and
measure values, elapsed times,
and
sweep parameters. Lithium battery
backup.
INTERLOCK: Use
with test fixture
or
external switch. Normally closed;
open puts instrument in standby.
Specifications subject to change without notice.
VOLTAGE
SOURCEV
MEASUREV
RANGE
ACCURACY
ACCURACY'
(Max.
STEP
(1
Year,
RESOLUTION
(1
Year,
Value)
SIZE 18°-28°C)
4-Digit 5-Digit
18°-28°C)
±1.5000V 100
!LV
±(0.033%
+
80011V
100
11V
10
11V
±(0.028%
+
450!1V
+
[1
0
/I.,J
X
60011
V)2
+
[I
0
/I.J
X
60011
V)
2
±15.000V
lmV
±(0.033%+
2.7mV)
lmV
100
11V
±(0.025%+
1.3mV)
±llO.OOV
lOmV
±(0.033%+
24mV)
lOmV
lmV
±(0.025%+ lOmV)
1
0
=
Output current
I.,;
=
Full scale
on
selected
current
range
1
Specifications
apply
for 5-digit resolution. For 4-digit resolution
add
lOOppm
of
range.
Assumes
remote
sense for I
>
lOOJ.IA.
2
On
the
lA
range
use
[1
0
/I.,J
x
250!1V.
COMPLIANCE: Bipolar current limit set with single value.
Maximum:
±lA
(±lOOmA
on
the
llOV
range).
Minimum:
±1%
of selected voltage range.
Accuracy,
Step Size:
Same as current source.
NOISE
(p-p typical):
Range
0.1-10Hz
110
V
<
3ppm
of range
15
V
<
3ppm
of
range
1.5
V
<10ppm
ofrange
WIDEBAND
NOISE:
0.1
to 20MHz, 8mV p-p typical.
OVERSHOOT:
<0.01%
(110V
step, lOrnA range).
SETTLING
TIME:
<500Jlsec. to
0.01%
(110V
step, lOrnA range).
NMRR: >60dB
at
50
or
60Hz (LINE
CYCLE
integration time selected).
CMRR: > 120dB
at
DC,
50
or
60Hz
(LINE
CYCLE
integration time selected).
INPUT IMPEDANCE (as a voltmeter):
>10
14
0
paralleled
by
<20pF.
CURRENT
SOURCE
I MEASURE I
RANGE
ACCURACY
ACCURACY'_.
(Max.
STEP
(1
Year,
RESOLUTION
(1
Year,
Value)
SIZE 18°-28°C)
4-Digit 5-Digit
18°-28°C)
±1.0000
nA
100 fA
±(0.3
%+
450 fA) 100
fA
10
fA ±(0.3
%+
100
fA)2
±10.000
nA
1
pA
±(0.3
%+
2pA)
lpA
100
fA ±(0.3
%+
1pA)
±100.00
nA
lOpA
±(0.21
%+
20
pA)
10pA
1pA
±(0.21
%+
6pA)
±1.0000
J.IA
100pA
±(0.05%+ 200
pA)
100pA
10pA
±(0.04
%+
60
pA)
±10.000
J.IA
1
nA
±(0.05%+
2nA)
lnA
100pA
±(0.035%+ 700
pA)
±100.00
J.IA
10
nA
±(0.05%+ 20
nA)
10nA
1nA
±(0.035%+
6nA)
±l.OOOOmA
100
nA
±(0.05%+ 200
nA)
100nA
lOnA
±(0.035%+
60
nA)
±10.000mA
lJ.IA
±(0.05%+
2
J.IA)
1J.IA
lOOnA ±(0.038%+600
nA)
±100.00mA
10
J.IA
±(0.1
%+
20
J.IA)
10
J.IA
liLA
±(0.1
%+
6!1A)
±1.0000 A
100
J.IA
±(0.12%+
700
J.IA)
100
J.IA
10
J.IA
±(0.12 %+300
J.IA)
1
Specifications
apply
for
5-digit
resolution. For 4-digit resolution,
all
offset
terms
are
200ppm
of
range.
2
0ffset
specification
applies
for
23°C ±
l°C
with
suppression.
Temperature
coefficient
50fA;oc.
COMPLIANCE: Bipolar voltage limit set with single value.
Maximum:
±llOV
(±15V
on
the
lA
range).
Minimum:
±1%
of selected current range.
Accuracy,
Step
Size:
Same as voltage source.
NOISE
(p-p
of
range):
0.1-10Hz:
<3ppm
(<20ppm
on
lnA,
lOnA
and
lA
ranges).
OVERSHOOT:
<0.01%
typical (lOrnA step,
1\
=
10k0).
SETTLING
TIME:
<500J1SeC.
to
0.01%
(lOrnA
step,
1\
=
lOkO).
OUTPUT R,
C:
>10
14
0
paralleled
by
<20pF (on
lnA
range).