Type 1787 Current Sense Resistor Networks
Page 1 of 2
Accurate Current Sensing in Multi-Range Instrumentation
Type 1787 Current Sense Resistor Networks utilize
Caddock's Micronox
®
resistance films and advanced high
thru-put laser manufacturing capabilities to achieve many
vital advantages in precision current measurement circuits,
including laboratory and bench-type digital instrumentation:
•
The thin-profile single-package configuration replaces as
many as four discrete current sense resistors.
simplify installation.
•
The monolithic construction and standardized lead spacing
•
Caddock Micronox
®
resistance films provide exceptional
stability for improved long-term measurement accuracy.
Twelve standard models in five network arrangements
provide the specific accuracy and resistance values required
for a wide range of current measuring instruments and
circuits.
Prototype quantities of most models of the Type 1787
Current Sense Resistor Networks are available either from
stock or within 6 weeks after receipt of order.
Model
No.
Resistance Values
Power Rating
Watts
R
A
999.9
Ω
999.9
Ω
1,000
Ω
1,000
Ω
999
Ω
999
Ω
999
Ω
1,000
Ω
R
B
99.9
Ω
99.9
Ω
100
Ω
100
Ω
99
Ω
99
Ω
99
Ω
100
Ω
R
C
9.9
Ω
9.9
Ω
10
Ω
10
Ω
9
Ω
9
Ω
9
Ω
10
Ω
R
D
0.9
Ω
0.9
Ω
1
Ω
1
Ω
N/A
N/A
N/A
N/A
R
A
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
R
B
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
R
C
0.50
0.50
0.50
0.50
0.75
0.75
0.75
0.75
R
D
1.0
1.0
1.0
1.0
N/A
N/A
N/A
N/A
Max. Power
Rating
Watts
Total Pkg.
1.0
1.0
1.0
1.0
0.75
0.75
0.75
0.75
Fig.
Absolute Stability
Absolute Maximum
Max. % Change in
Tolerance Absolute
Resistance Value
%
TC
1
ppm/°C Load Life Shelf Life
2
3
4
1787-31
1787-312
1787-41
1787-412
1787-5
1787-53
1787-535
1787-6
1
1
2
2
3
3
3
4
0.25
0.10
0.25
0.10
0.25
0.10
0.05
0.25
80
80
80
80
50
50
50
50
0.05
0.03
0.05
0.03
0.04
0.02
0.02
0.04
0.03
0.02
0.03
0.02
0.02
0.01
0.01
0.02
1787-64
1,000
Ω
100
Ω
10
Ω
N/A
0.25
0.25
0.75
N/A
0.75
4
0.10
50
0.02
0.01
1787-645
1787-13
1787-132
1,000
Ω
99.9
Ω
99.9
Ω
100
Ω
9.9
Ω
9.9
Ω
10
Ω
0.9
Ω
0.9
Ω
N/A
N/A
N/A
0.25
0.25
0.25
0.25
0.50
0.50
0.75
1.0
1.0
N/A
N/A
N/A
0.75
1.0
1.0
4
5
5
0.05
0.25
0.10
50
100
100
0.02
0.05
0.03
0.01
0.03
0.02
1
2
3
4
5
6
7
Absolute Tolerance:
Tolerance of R
A
, R
B
, R
C,
or R
D
when
measured in accordance with proper
Figure No.
1
2
3
4
5
6
7
Absolute Temperature Coefficient:
1
Temperature coefficient of R
A
, R
B
, R
C,
or
R
D
from 0°C to +70°C, referenced to
+25°C.
4
6
Load
5
Life:
7
Stability of R
A
, R
B
, R
C,
or R
D
with full power applied individually for
2,000 hours at +70°C.
2
3
4
5
7
Shelf
6
Life:
Stability of R
A
, R
B
, R
C,
or R
D
for
six months at shelf conditions.
Storage Temperature:
-55°C to +85°C.
1
2
3
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
CADDOCK
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL119.1004
Type 1787 Current Sense Resistor Networks
Page 2 of 2
Figure 1 - Model Nos. 1787-31 and 1787-312
1.150
±.020
(29.21
±.51)
CADDOCK
MODEL 1787-312
0421
Figure 2 - Model Nos. 1787-41 and 1787-412
1.150
±.020
(29.21
±.51)
CADDOCK
MODEL 1787-412
0422
.090
(2.29)
MAX.
.580
±.020
(14.73
±.51)
.090
(2.29)
MAX.
.580
±.020
(14.73
±.51)
PIN 1
.025
±.002
(.64
±.05)
DIA.
Tinned Copper
PIN 1
.025
±.002
(.64
±.05)
DIA.
Tinned Copper
.200 (5.08)
.400 (10.16)
.700 (17.78)
.250
±.050
(6.35
±1.27)
.900 (22.86)
1.000 (25.40)
.075
(1.91)
*
Correct installation and accurate
measurement of the networks'
characteristics requires that
Pins 5 and 6 be shorted within
.100" (2.54 mm) of the body of the
network. All measurements must
be made at this point.
.200 (5.08)
.400 (10.16)
.700 (17.78)
.075
(1.91)
.900 (22.86)
1.000 (25.40)
.250
±.050
(6.35
±1.27)
900Ω 90Ω
9Ω
0.9Ω
0.1Ω
900Ω 90Ω
9Ω
1Ω
1
2
3
4
R
A
R
B
R
C
R
D
5
6
Model Nos. 1787-31 and 1787-312
are normally to be used in series
with a customer purchased 0.1Ω
wirewound resistor with Kelvin
terminations.
1
2
3
4
R
A
R
B
R
C
R
D
5
6
Model Nos. 1787-31 and 1787-312 Measurement Connections
Resistances
"R"
R
A
R
B
Kelvin Connections
Model Nos. 1787-41 and 1787-412 Measurement Connections
Resistances
Kelvin Connections
Total
Value
999.9
Ω
99.9
Ω
Sense
Lead
P
1
Pin 1
Pin 1
Current
Lead
C
1
Current
Lead
C
2
Pin 5
Pin 5
Sense
Lead
P
2
Pin 6
Pin 6
"R"
R
A
R
B
Total
Value
1,000
Ω
100
Ω
Sense
Lead
P
1
Pin 1
Pin 1
Current
Lead
C
1
Current
Lead
C
2
Sense
Lead
P
2
Pin 1
Pin 2
*
*
*
*
Pin 1
Pin 2
Pin 5
Pin 5
Pin 6
Pin 6
R
C
R
D
9.9
Ω
0.9
Ω
Pin 1
Pin 1
Pin 3
Pin 4
Pin 5
Pin 5
*
*
Pin 6
Pin 6
*
*
R
C
R
D
10
Ω
1
Ω
Pin 1
Pin 1
Pin 3
Pin 4
Pin 5
Pin 5
Pin 6
Pin 6
Figure 3 - Model Nos. 1787-5,
1787-53, and 1787-535
.850
±.020
(21.59
±.51)
CADDOCK
MODEL 1787-5
0406
Figure 4 - Model Nos. 1787-6,
1787-64, and 1787-645
.850
±.020
(21.59
±.51)
CADDOCK
MODEL 1787-6
0421
Figure 5 - Model Nos. 1787-13 and 1787-132
1.000
±.020
(25.40
±.51)
CADDOCK
MODEL 1787-132
0405
.090
(2.29)
MAX.
.580
±.020
(14.73
±.51)
.025
±.002
(.64
±.05)
DIA.
Tinned Copper
.090
(2.29)
MAX.
.580
±.020
(14.73
±.51)
.025
±.002
(.64
±.05)
DIA.
Tinned Copper
.090
(2.29)
MAX.
.580
±.020
(14.73
±.51)
PIN 1
PIN 1
PIN 1
.200 (5.08)
.500 (12.70)
.700 (17.78)
.800 (20.32)
.025
±.002
(.64
±.05)
DIA.
Tinned Copper
.250
±.050
(6.35
±1.27)
.200 (5.08)
.400 (10.16)
.700 (17.78)
.075
(1.91)
.250
±.050
(6.35
±1.27)
.200 (5.08)
.400 (10.16)
.700 (17.78)
.075
(1.91)
.250
±.050
(6.35
±1.27)
.100
(2.54)
*
Correct installation and accurate
measurement of the networks'
characteristics requires that
Pins 4 and 5 be shorted within
.100" (2.54 mm) of the body of the
network. All measurements must
be made at this point.
900Ω
90Ω
9Ω
900Ω
90Ω
10Ω
90Ω
9Ω
0.9Ω
0.1Ω
1
R
A
2
R
B
3
R
C
4
1
R
A
2
R
B
3
R
C
4
1
R
A
2
R
B
3
R
C
4
5
Model Nos. 1787-13 and 1787-132
are normally to be used in series
with a customer purchased 0.1Ω
wirewound resistor with Kelvin
terminations.
Model Nos. 1787-13 and 1787-132 Measurement Connections
Resistances
"R"
Total
Value
Resistances
"R"
Total
Value
Resistances
"R"
Total
Value
Sense
Lead
P
1
Kelvin Connections
Current
Lead
C
1
Current
Lead
C
2
Pin 4
Pin 4
Pin 4
Sense
Lead
P
2
Pin 5
Pin 5
Pin 5
R
A
999
Ω
R
A
1,000
Ω
R
A
99.9
Ω
Pin 1
Pin 1
Pin 2
Pin 3
*
*
*
*
*
*
R
B
R
C
99
Ω
9
Ω
R
B
R
C
100
Ω
10
Ω
R
B
R
C
9.9
Ω
0.9
Ω
Pin 1
Pin 1
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
CADDOCK
DIMENSIONS IN INCHES AND (MILLIMETERS)
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
28_IL119.1004
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