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.
Absolute Stability
Max. % Change in
Resistance Value
Power Rating
Watts
Max. Power
Rating
Watts
Absolute Maximum
Tolerance Absolute
Resistance Values
Model
No.
Fig.
%
TC
ppm/°C
2
Load Life Shelf Life
Total Pkg.
1
RA
RB
RC
RD
RA
RB
RC
RD
3
4
1787-31
999.9 Ω 99.9 Ω
9.9 Ω
9.9 Ω
10 Ω
10 Ω
9 Ω
0.9 Ω
0.9 Ω
1 Ω
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.25
0.50
0.50
0.50
0.50
0.50
0.50
0.75
0.75
0.75
0.75
0.75
0.75
1.0
1.0
1.0
1.0
1
1
2
2
3
3
3
4
4
4
5
5
0.25
0.10
0.25
0.10
0.25
0.10
0.05
0.25
0.10
0.05
0.25
0.10
80
80
0.05
0.03
0.05
0.03
0.04
0.02
0.02
0.04
0.02
0.02
0.05
0.03
0.03
0.02
0.03
0.02
0.02
0.01
0.01
0.02
0.01
0.01
0.03
0.02
1787-312 999.9 Ω 99.9 Ω
1787-41 1,000 Ω 100 Ω
1787-412 1,000 Ω 100 Ω
1.0
1.0
1.0
80
1 Ω
1.0
1.0
80
1787-5
999 Ω
999 Ω
999 Ω
99 Ω
99 Ω
99 Ω
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
0.75
0.75
0.75
0.75
0.75
0.75
1.0
50
1787-53
1787-535
1787-6
9 Ω
50
9 Ω
50
1,000 Ω 100 Ω
1,000 Ω 100 Ω
10 Ω
10 Ω
10 Ω
0.9 Ω
0.9 Ω
50
1787-64
50
1787-645 1,000 Ω 100 Ω
50
1787-13
99.9 Ω
99.9 Ω
9.9 Ω
9.9 Ω
100
100
1787-132
1.0
1.0
1
2
4
Absolute Tolerance:
Absolute Temperature Coefficient:
Temperature coefficient of RA, RB, RC, or
RD from 0°C to +70°C, referenced to
+25°C.
ShelfLife: StabilityofRA, RB, RC, orRD for
six months at shelf conditions.
Tolerance of RA, RB, RC, or RD when
measured in accordance with proper
Figure No.
Storage Temperature: -55°C to +85°C.
3
Load Life: Stability of RA, RB, RC, or RD
with full power applied individually for
2,000 hours at +70°C.
Applications Engineering
17271 North Umpqua Hwy.
Roseburg, Oregon 97470-9422
Phone: (541) 496-0700
Sales and Corporate Office
1717 Chicago Avenue
Riverside, California 92507-2364
Phone: (951) 788-1700
e-mail: caddock@caddock.com • web: www.caddock.com
For Caddock Distributors listed by country see caddock.com/contact/dist.html
Fax: (541) 496-0408
Fax: (951) 369-1151
© 2004 Caddock Electronics, Inc.
28_IL119.1004