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 f or 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
RA
999.9 Ω
999.9 Ω
1,000 Ω
1,000 Ω
999 Ω
999 Ω
999 Ω
1,000 Ω
RB
99.9 Ω
99.9 Ω
100 Ω
100 Ω
99 Ω
99 Ω
99 Ω
100 Ω
RC
9.9 Ω
9.9 Ω
10 Ω
10 Ω
9Ω
9Ω
9Ω
10 Ω
RD
0.9 Ω
0.9 Ω
1Ω
1Ω
N/A
N/A
N/A
N/A
RA
0.25 0.25
0.25
0.25
0.25
0.25
0.25
0.25
RB
0.25 0.25
0.25
0.25
0.25
0.25
0.25
0.25
RC
0.50 0.50
0.50
0.50
0.75
0.75
0.75
0.75
RD
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 RA, RB, RC, or RD when measured in accordance with proper Figure No.
1
2
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. 4 6 Load5 Life: 7 tability of RA, RB, RC, or RD S with full power applied individually for 2,000 hours at +70°C.
2
3
4
5 7 Shelf6Life: Stability of RA, RB, RC, or RD 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
RA
RB
RC
RD
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
RA
RB
RC
RD
5
6
Model Nos. 1787-31 and 1787-312 Measurement Connections
Resistances "R"
RA
RB
Kelvin Connections
Model Nos. 1787-41 and 1787-412 Measurement Connections
Resistances
Kelvin Connections
Total Value
999.9 Ω
99.9 Ω
Sense Lead P1
Pin 1
Pin 1
Current Lead C1
Current Lead C2
Pin 5 Pin 5
Sense Lead P2
Pin 6 Pin 6
"R"
RA
RB
Total Value
1,000 Ω
100 Ω
Sense Lead P1
Pin 1
Pin 1
Current Lead C1
Current Lead C2
Sense Lead P2
Pin 1 Pin 2
* *
* *
Pin 1 Pin 2
Pin 5 Pin 5
Pin 6 Pin 6
RC RD
9.9 Ω 0.9 Ω
Pin 1 Pin 1
Pin 3 Pin 4
Pin 5 Pin 5
* *
Pin 6 Pin 6
* *
RC RD
10 Ω 1Ω
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
RA
2
RB
3
RC
4
1
RA
2
RB
3
RC
4
1
RA
2
RB
3
RC
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 P1
Kelvin Connections Current Lead C1 Current Lead C2
Pin 4 Pin 4 Pin 4
Sense Lead P2
Pin 5 Pin 5 Pin 5
RA
999 Ω
RA
1,000 Ω
RA
99.9 Ω
Pin 1
Pin 1 Pin 2 Pin 3
* * *
* * *
RB RC
99 Ω 9Ω
RB RC
100 Ω 10 Ω
RB RC
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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