Models 236 and 237 Source Measure
Units Specifications
SOURCE-MEASURE
UNIT: Sources voltage while measuring cur-
rent,
or
sources current while measuring voltage.
FUNCTION:CanbeusedasDCsourceormeter,sweepsource,orfull
source-measure
unit
SOURCE-DELAY-MEASURE
CYCLE:
Source
Value
j_
Source-Delay-Measure Cycle
_L
I
o;::t
I
Delay
I
In~~ime
I
Default Delay: Fixed delay for instrument settling.
User Delay: Additional delay for device
under
test
or
system ca-
pacitance.
MEASURE:
Integration Time:
Fast 416
JlSeC.
Medium 4 msec.
Line Cycle 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
measurement complete for each step
of
sweep.
RANGING:
Source:
Auto-ranging through keypad entry; fixed range selection
using rotary dial
and
SELECT
keys
(DC
function). Fully
pro-
grammable
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 read-
ings.
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.
lith-
ium
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)
±1.1000V2
100
~tV
±(0.033%+650
~tV
100
~tV
10
~tV
±(0.028%
+
300~tV
+
IIofi.J
X
450!1V)
+
[Io/I.J
X
450!1V)
±ll.OOOV
lmV
±(0.033%+
2.4mV)
lmV
100
~tV
±(0.025%+
lmV)
±llO.OOV
lOmV
±(0.033%+
24mV)
lOmV
lmV
±(0.025%+
lOmV)
±llOO.OV'
100
mV
±(0.04 %+240mV) lOOmV
lOmV
±(0.035%+ 100m
V)
I,=
Output
current
IPS
=
Full scale
on
selected current range
1
Specifications
apply
for 5-digit resolution. For 4-digit resolution
add
lOOppm
of
range.
2
Assumes remote sense for
I
>
100!1A.
'llOOV
range available
on
Model237 only.
COMPLIANCE: Bipolar current limit set
with
single value.
Maximum:
±lOOmA
(except
±lOrnA
on
llOOV
range in Model237).
Minimum:
±0.1%
of
range, except
0.5%
of
1.1
V
range.
Accuracy,
Step Size:
Same as current source.
NOISE
(p-p): Range
0.1-lOHz
llOV-llOOV
<
3ppm
of
range
11
V
<
3ppm
of
range
1.1
V <10ppm
of
range
WIDEBAND
NOISE:
0.1
to
20MHz, 8mV
p-p typicaL
OVERSHOOT:
<0.01%
(llOV step,
lOrnA
range).
SETTLING
TIME:
<500J1Sec.
to
0.01%
(llOV 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
!2
paralleled
by
<20pF.
CURRENT
RANGE
(Max.
Value)
±1.0000
nA
±10.000
nA
±100.00
nA
±1.0000
I1A
±10.000
I1A
±100.00
I1A
±l.OOOOmA
±lO.OOOmA
±lOO.OOmA
SOURCE
I
STEP
SIZE
ACCURACY
(1
Year,
18•-28•C)
100
fA ±(0.3 %+450
fA)
1
pA
±(0.3
%+
2 pA)
10
pA
±(0.21
%+
20
pA)
100
pA
±(0.05%+200
pA)
1
nA
±(0.05%+
2 nA)
10
nA
±(0.05%+ 20
nA)
100
nA
±(0.05%+200
nA)
lilA
±(0.05%+ 2!1A)
10
I1A
±(0.1
%+
20
ItA)
MEASURE
I
RESOLUTION
4-Digit 5-Digit
ACCURACY'
(1
Year,
18•-28•C)
100
fA
lpA
lOpA
lOOpA
InA
lOnA
lOOnA
lilA
lO!lA
10
fA
±(0.3
%+100
fA)
2
100
fA
±(0.3
%+
1 pA)
1
pA
±(0.21
%+
6 pA)
10
pA
±(0.04
%+
60
pA)
100
pA
±(0.035%+700
pA)
1
nA
±(0.035%+
6 nA)
10
nA
±(0.035%+ 60 nA)
100
nA
±(0.038%+600 nA)
lilA
±(0.1
%+
6!1A)
1
Specifications
apply
for 5-digit resolution. For 4-digit resolution,
all
offset terms
are
200ppm
of
range.
2
Offset
specification applies for
23•c
± 1
•c
with
suppression. Temperature
coefficient
SOfA/"C.
COMPLIANCE: Bipolar voltage limit set
with
single value.
Maximum:
±llOOV (except
±llOV
on
lOOmA
range in Model237).
Minimum:
±0.1%
of selected current range.
Accuracy, Step Size:
Same as voltage source.
NOISE
(p-p
of
range):
0.1-lOHz:
<3ppm
(<20ppm
on
lnA
and
lOnA
ranges).
OVERSHOOT:
<0.01%
typical (lOrnA
step,
1\
=
lOkn).
SETTLING
TIME:
<500J1Sec.
to
0.01%
(lOrnA
step,
1\
=
lOkn).
OUTPUT
R,
C:
>10
14
!2
paralleled
by
<20pF
(on
lnA
range).
VOLTAGE
BURDEN (as
an
ammeter):
<lm
V.
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