ETC 1787-412

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.
• 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.
Model
No.
1
Power Rating
Watts
Resistance Values
Max. Power
Rating
Watts
Total Pkg.
Fig.
RA
RB
RC
RD
RA
RB
RC
RD
1787-31
999.9 Ω
99.9 Ω
9.9 Ω
0.9 Ω
0.25
0.25
0.50
1.0
1.0
1
1787-312
999.9 Ω
99.9 Ω
9.9 Ω
0.9 Ω
0.25
0.25
0.50
1.0
1.0
1787-41
1,000 Ω
100 Ω
10 Ω
1Ω
0.25
0.25
0.50
1.0
1787-412
1,000 Ω
100 Ω
10 Ω
1Ω
0.25
0.25
0.50
1.0
Absolute Stability
Absolute Maximum
Max. % Change in
Tolerance Absolute
Resistance Value
TC
%
1
ppm/°C Load Life Shelf Life
2
3
4
0.25
80
0.05
0.03
1
0.10
80
0.03
0.02
1.0
2
0.25
80
0.05
0.03
1.0
2
0.10
80
0.03
0.02
1787-5
999 Ω
99 Ω
9Ω
N/A
0.25
0.25
0.75
N/A
0.75
3
0.25
50
0.04
0.02
1787-53
999 Ω
99 Ω
9Ω
N/A
0.25
0.25
0.75
N/A
0.75
3
0.10
50
0.02
0.01
1787-535
999 Ω
99 Ω
9Ω
N/A
0.25
0.25
0.75
N/A
0.75
3
0.05
50
0.02
0.01
1787-6
1,000 Ω
100 Ω
10 Ω
N/A
0.25
0.25
0.75
N/A
0.75
4
0.25
50
0.04
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
1,000 Ω
100 Ω
10 Ω
N/A
0.25
0.25
0.75
N/A
0.75
4
0.05
50
0.02
0.01
1787-13
99.9 Ω
9.9 Ω
0.9 Ω
N/A
0.25
0.50
1.0
N/A
1.0
5
0.25
100
0.05
0.03
1787-132
99.9 Ω
9.9 Ω
0.9 Ω
N/A
0.25
0.50
1.0
N/A
1.0
5
0.10
100
0.03
0.02
2
3
4 Tolerance:
5
6
7
Absolute
Tolerance of RA, RB, RC, or RD when
measured in accordance with proper
Figure No.
1
1
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Fax: (541) 496-0408
© 2004 Caddock Electronics, Inc.
2
2
3
3
4
5
6
7
Absolute
Temperature
Coefficient:1
Temperature coefficient of RA, RB, RC, or
RD from 0°C to +70°C, referenced to
+25°C.
2
3
4
5
6Life:
7
Shelf
Stability of RA, RB, RC, or RD for
six months at shelf conditions.
Storage Temperature: -55°C to +85°C.
4
5 Life:
6
7
Load
Stability of RA, RB, RC, or RD
with full power applied individually for
2,000 hours at +70°C.
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 2 - Model Nos. 1787-41 and 1787-412
Figure 1 - Model Nos. 1787-31 and 1787-312
1.150 ±.020
(29.21 ±.51)
1.150 ±.020
(29.21 ±.51)
.090
(2.29)
MAX.
CADDOCK
MODEL 1787-312
0421
.580 ±.020
(14.73 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
9Ω
900Ω 90Ω
1
2
RC
RB
RA
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.
0.9Ω
4
3
RD
.200 (5.08)
.400 (10.16)
.700 (17.78)
installation and accurate
* Correct
measurement of the networks'
.075
(1.91)
.900 (22.86)
1.000 (25.40)
6
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
.250 ±.050
(6.35 ±1.27)
.075
(1.91)
.900 (22.86)
1.000 (25.40)
9Ω
900Ω 90Ω
0.1Ω
5
.580 ±.020
(14.73 ±.51)
PIN 1
.250 ±.050
(6.35 ±1.27)
.200 (5.08)
.400 (10.16)
.700 (17.78)
.090
(2.29)
MAX.
CADDOCK
MODEL 1787-412
0422
1
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.
2
1Ω
4
3
RC
RB
RA
RD
6
5
Model Nos. 1787-31 and 1787-312 Measurement Connections
Model Nos. 1787-41 and 1787-412 Measurement Connections
Resistances
Resistances
Kelvin Connections
"R"
Total
Value
Sense
Lead
P1
RA
999.9 Ω
Pin 1
Pin 1
Pin 5
*
Pin 6
*
Current
Lead
C1
Current
Lead
C2
Sense
Lead
P2
Kelvin Connections
"R"
Total
Value
Sense
Lead
P1
RA
1,000 Ω
Pin 1
Pin 1
Pin 5
Pin 6
Current
Lead
C1
Current
Lead
C2
Sense
Lead
P2
RB
99.9 Ω
Pin 1
Pin 2
Pin 5
*
Pin 6
*
RB
100 Ω
Pin 1
Pin 2
Pin 5
Pin 6
RC
9.9 Ω
Pin 1
Pin 3
Pin 5
*
Pin 6
*
RC
10 Ω
Pin 1
Pin 3
Pin 5
Pin 6
RD
0.9 Ω
Pin 1
Pin 4
Pin 5
*
Pin 6
*
RD
1Ω
Pin 1
Pin 4
Pin 5
Pin 6
Figure 3 - Model Nos. 1787-5,
1787-53, and 1787-535
.850 ±.020
(21.59 ±.51)
.580 ±.020
(14.73 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.200 (5.08)
.400 (10.16)
.700 (17.78)
.075
(1.91)
900Ω 90Ω
RB
.250 ±.050
(6.35 ±1.27)
RC
4
CADDOCK
MODEL 1787-6
0421
.580 ±.020
(14.73 ±.51)
.200 (5.08)
.400 (10.16)
.700 (17.78)
.075
(1.91)
RB
.250 ±.050
(6.35 ±1.27)
RC
.090
(2.29)
MAX.
CADDOCK
MODEL 1787-132
0405
.580 ±.020
(14.73 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
.250 ±.050
(6.35 ±1.27)
.200 (5.08)
.500 (12.70)
.700 (17.78)
.800 (20.32)
1
4
installation and accurate
*Correct
measurement of the networks'
.100
(2.54)
90Ω
10Ω
3
2
RA
1.000 ±.020
(25.40 ±.51)
.025 ±.002
(.64 ±.05) DIA.
Tinned Copper
PIN 1
1
Figure 5 - Model Nos. 1787-13 and 1787-132
.090
(2.29)
MAX.
900Ω 90Ω
9Ω
3
2
RA
.850 ±.020
(21.59 ±.51)
.090
(2.29)
MAX.
CADDOCK
MODEL 1787-5
0406
1
Figure 4 - Model Nos. 1787-6,
1787-64, and 1787-645
9Ω
0.9Ω
2
RA
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.
3
RB
RC
0.1Ω
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
Resistances
Kelvin Connections
Resistances
Current
Lead
C1
Current
Lead
C2
Sense
Lead
P2
"R"
Total
Value
"R"
Total
Value
"R"
Total
Value
Sense
Lead
P1
RA
999 Ω
RA
1,000 Ω
RA
99.9 Ω
Pin 1
Pin 1
Pin 4
*
Pin 5
*
RB
99 Ω
RB
100 Ω
RB
9.9 Ω
Pin 1
Pin 2
Pin 4
*
Pin 5
*
RC
9Ω
RC
10 Ω
RC
0.9 Ω
Pin 1
Pin 3
Pin 4
*
Pin 5
*
DIMENSIONS IN INCHES AND (MILLIMETERS)
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