Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
© 2004 Caddock Electronics, Inc.
CAD KDOC
65432
1
7
65432
1
7
65432
1
7
65432
1
7
Fig.
Resistance Values
Model
No.
Absolute Stability
Max. % Change in
Resistance Value
Shelf Life
Load Life
Max. Power
Rating
Watts
Total Pkg.
Maximum
Absolute
TC
ppm/°C
Absolute
Tolerance
%
RA
RBRCRD
1
2
3
4
Power Rating
Watts
RA
RBRCRD
1787-31
0.25
80
0.030.051.0
999.9 Ω
99.9 Ω
9.9 Ω0.9 Ω
1
0.25 0.25 0.50 1.0
1787-312
0.10
80
0.020.031.0
999.9 Ω
99.9 Ω
9.9 Ω0.9 Ω
1
0.25 0.25 0.50 1.0
1787-41
0.25
80
0.030.051.0
1,000 Ω
100 Ω
10 Ω
1 Ω
2
0.25 0.25 0.50 1.0
1787-412
0.10
80
0.020.031.0
1,000 Ω
100 Ω
10 Ω
1 Ω
2
0.25 0.25 0.50 1.0
1787-5
0.25
50
0.020.04
N/A
999 Ω
99 Ω
9 Ω
N/A
3
0.25 0.25 0.75 0.75
1787-53
0.10
50
0.010.02
N/A
999 Ω
99 Ω
9 Ω
N/A
3
0.25 0.25 0.75 0.75
1787-535
0.05
50
0.010.02
N/A
999 Ω
99 Ω
9 Ω
N/A
3
0.25 0.25 0.75 0.75
1787-6
0.25
50
0.020.04
N/A
1,000 Ω
100 Ω
10 Ω
N/A
4
0.25 0.25 0.75 0.75
1787-64
0.10
50
0.010.02
N/A
1,000 Ω
100 Ω
10 Ω
N/A
4
0.25 0.25 0.75 0.75
1787-645
0.05
50
0.010.02
N/A
1,000 Ω
100 Ω
10 Ω
N/A
4
0.25 0.25 0.75 0.75
1787-13
0.25
100
0.030.05
N/A
99.9 Ω
9.9 Ω0.9 Ω
N/A
5
0.25 0.50 1.0 1.0
1787-132
0.10
100
0.020.03
N/A
99.9 Ω
9.9 Ω0.9 Ω
N/A
5
0.25 0.50 1.0 1.0
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.
• The monolithic construction and standardized lead spacing
simplify installation.
• 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.
Absolute Tolerance:
Tolerance of RA, RB, RC, or RD when
measured in accordance with proper
Figure No.
Absolute Temperature Coefficient:
Temperature coefficient of RA, RB, RC, or
RD from 0°C to +70°C, referenced to
+25°C.
Load Life: Stability of RA, RB, RC, or RD
with full power applied individually for
2,000 hours at +70°C.
Shelf Life: Stability of RA, RB, RC, or RD for
six months at shelf conditions.
Storage Temperature: -55°C to +85°C.
Type 1787 Current Sense Resistor Networks
Page 1 of 2
28_IL119.1004
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
Fax: (951) 369-1151
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
© 2004 Caddock Electronics, Inc.
CAD KDOC
.580 ±.020
(14.73 ±.51)
1.150 ±.020
(29.21 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.250 ±.050
(6.35 ±1.27)
.400 (10.16)
.700 (17.78)
.900 (22.86)
1.000 (25.40)
.200 (5.08)
.090
(2.29)
MAX.
900Ω
90Ω
1
2
3
9Ω
1Ω
4 5
6
R
D
R
C
RB
RA
CADDOCK
MODEL 1787-412
042
2
.075
(1.91)
DIMENSIONS IN INCHES AND (MILLIMETERS)
.580 ±.020
(14.73 ±.51)
1.150 ±.020
(29.21 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.250 ±.050
(6.35 ±1.27)
.400 (10.16)
.700 (17.78)
.900 (22.86)
1.000 (25.40)
.200 (5.08)
.090
(2.29)
MAX.
0.1Ω
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.
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.
*
900Ω
90Ω
1
2
3
9Ω
0.9Ω
4 5
6
RD
RC
RB
RA
CADDOCK
MODEL 1787-312
042
1
.075
(1.91)
.580 ±.020
(14.73 ±.51)
.850 ±.020
(21.59 ±.51)
900Ω
1
2
90Ω
9Ω
3 4
RC
RB
R
A
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.250 ±.050
(6.35 ±1.27)
.400 (10.16)
.700 (17.78)
.200 (5.08)
.090
(2.29)
MAX.
CADDOCK
MODEL 1787-5
04
06
.075
(1.91)
.580 ±.020
(14.73 ±.51)
900Ω
1
2
90Ω
10Ω
3 4
RC
RB
R
A
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.250 ±.050
(6.35 ±1.27)
.400 (10.16)
.700 (17.78)
.200 (5.08)
.090
(2.29)
MAX.
CADDOCK
MODEL 1787-6
0421
.075
(1.91)
.850 ±.020
(21.59 ±.51)
.580 ±.020
(14.73 ±.51)
1.000 ±.020
(25.40 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.250 ±.050
(6.35 ±1.27)
.500 (12.70)
.700 (17.78)
.800 (20.32)
.200 (5.08)
.090
(2.29)
MAX.
*
90Ω
1
2
9Ω
0.9Ω
3 4
5
R
C
R
B
R
A
CADDOCK
MODEL 1787-132
04
05
.100
(2.54)
0.1Ω
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.
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.
Resistances
"R"
Total
Value
Sense
Lead
P1
Kelvin Connections
Current
Lead
C1
Current
Lead
C2
Sense
Lead
P2
RA
99.9 Ω
Pin 1 Pin 1
Pin 4 *Pin 5 *
R
B
9.9 Ω
Pin 1 Pin 2
Pin 4 *Pin 5 *
RC
0.9 Ω
Pin 1
Pin 3
Pin 4 *Pin 5 *
Resistances
"R"
Total
Value
RA
1,000 Ω
RB
100 Ω
RC
10 Ω
Resistances
"R"
Total
Value
R
A
999 Ω
R
B
99 Ω
RC
9 Ω
Resistances
"R"
Total
Value
Sense
Lead
P1
Kelvin Connections
Current
Lead
C
1
Current
Lead
C
2
Sense
Lead
P2
R
A
1,000 Ω
Pin 1
Pin 1 Pin 5 Pin 6
RB
100 Ω
Pin 1 Pin 2 Pin 5 Pin 6
RC
10 Ω
Pin 1
Pin 3 Pin 5 Pin 6
RD
1 Ω
Pin 1
Pin 4 Pin 5 Pin 6
Resistances
"R"
Total
Value
Sense
Lead
P1
Kelvin Connections
Current
Lead
C1
Current
Lead
C
2
Sense
Lead
P2
RA
999.9 Ω
Pin 1
Pin 1
Pin 5 *Pin 6 *
RB
99.9 Ω
Pin 1 Pin 2
Pin 5 *Pin 6 *
RC
9.9 Ω
Pin 1
Pin 3
Pin 5 *Pin 6 *
RD
0.9 Ω
Pin 1
Pin 4
Pin 5 *Pin 6 *
Figure 1 - Model Nos. 1787-31 and 1787-312
Model Nos. 1787-31 and 1787-312 Measurement Connections Model Nos. 1787-41 and 1787-412 Measurement Connections
Figure 2 - Model Nos. 1787-41 and 1787-412
Figure 3 - Model Nos. 1787-5,
1787-53, and 1787-535
Figure 4 - Model Nos. 1787-6,
1787-64, and 1787-645
Figure 5 - Model Nos. 1787-13 and 1787-132
Model Nos. 1787-13 and 1787-132 Measurement Connections
Type 1787 Current Sense Resistor Networks
Page 2 of 2
28_IL119.1004
