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| 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(R) 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(R) 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 RA 999.9 999.9 1,000 1,000 999 999 999 1,000 RB 99.9 99.9 100 100 99 99 99 100 RC 9.9 9.9 10 10 9 9 9 10 RD 0.9 0.9 1 1 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 1,000 100 10 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 99.9 99.9 100 9.9 9.9 10 0.9 0.9 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 0C to +70C, referenced to +25C. 4 6 Load5 Life: 7 Stability of RA, RB, RC, or RD with full power applied individually for 2,000 hours at +70C. 2 3 4 5 7 Shelf6Life: Stability of RA, RB, RC, or RD for six months at shelf conditions. Storage Temperature: -55C to +85C. 1 2 3 Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 (c) 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) 900 90 9 0.9 0.1 900 90 9 1 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 0.1 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 99.9 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 1,000 100 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 0.9 Pin 1 Pin 1 Pin 3 Pin 4 Pin 5 Pin 5 * * Pin 6 Pin 6 * * RC RD 10 1 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. 900 90 9 900 90 10 90 9 0.9 0.1 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 0.1 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 RA 1,000 RA 99.9 Pin 1 Pin 1 Pin 2 Pin 3 * * * * * * RB RC 99 9 RB RC 100 10 RB RC 9.9 0.9 Pin 1 Pin 1 Applications Engineering 17271 North Umpqua Hwy. Roseburg, Oregon 97470-9422 Phone: (541) 496-0700 Fax: (541) 496-0408 (c) 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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