Encore 635-002 Manual

Strain gage amplifier

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MANUAL

MODEL 635-002

STRAIN GAGE AMPLIFIER

INDEX

2...................DESCRIPTION

3...................I. SPECIFICATIONS: AMPLIFIER MODULE

5...................II. SPECIFICATIONS: RACK ADAPTER ASSEMBLY

6...................III. SPECIFICATIONS: POWER SUPPLY

7...................PCB JUMPER ASSIGNMENTS

8...................BRIDGE MODES, FIGURE 1

9...................CIRCUIT DESCRIPTION

10-13............PIN-OUT TABLES

14.................SET-UP PROCEDURE

16.................ACCEPTANCE TEST PROCEDURE

17.................ACCEPTANCE TEST DATA SHEET

19.................SCHEMATIC: AMPLIFIER MODULE D13555

20.................SCHEMATIC: POWER SUPPLY C13597

21.................FRONT RACK: ASSEMBLY 4007-137

22.................REAR RACK: ASSEMBLY 4007-137

Reviewed 3.24.03 mbz

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Summary of Contents for Encore 635-002

Page 1 MANUAL MODEL 635-002 STRAIN GAGE AMPLIFIER INDEX 2....DESCRIPTION 3....I. SPECIFICATIONS: AMPLIFIER MODULE 5....II. SPECIFICATIONS: RACK ADAPTER ASSEMBLY 6....III. SPECIFICATIONS: POWER SUPPLY 7....PCB JUMPER ASSIGNMENTS 8....BRIDGE MODES, FIGURE 1 9....CIRCUIT DESCRIPTION 10-13....PIN-OUT TABLES 14....SET-UP PROCEDURE 16....ACCEPTANCE TEST PROCEDURE 17....ACCEPTANCE TEST DATA SHEET 19....SCHEMATIC: AMPLIFIER MODULE D13555...
Page 2: Description
CONSTRUCTION: The amplifier uses modular construction. Seven modules can be accommodated in a rack adapter, Encore Model 4007-137. The rack also accommodates a Model 843 power supply module. This module provides unregulated +,-24VDC for the amplifier circuitry, plus seven isolated +,-24VDC outputs for the bridge excitation circuits.
Page 3: I. Specifications: Amplifier Module
MODEL 635 I. SPECIFICATIONS: AMPLIFIER MODULE MECHANICAL: The amplifier plug-in module is 7"H x 2"W x 12"D and weighs 16 oz. BRIDGE EXCITATION: Front panel adjustable, +1.0 to +15VDC with ON/OFF switch. A separate transformer- isolated, unregulated + ,-24VDC power source is provided to each module. BRIDGE CONFIGURATION: Front panel switch selectable for 1/4 STATIC, 1/2 STATIC, 1/4 DYNAMIC, FULL and EMF as follows: 1/4 STAT POSITION: Single active gage in a bridge configuration.
Page 4 DC: The input circuit is DC coupled. DC CAL: A front-panel-selected internal calibration resistor is connected from -P to +S or -P to -S (Jumper Selectable).Values are 11.88K, 19.88K, 49.00K and 99.00K. ZERO: Used with front panel trimpot to null the amplifier with zero-input signal. INPUT SIGNAL: The sum of the DC and AC signals should not exceed +,-10Vdivided by the gain setting.
Page 5 II. SPECIFICATIONS: MODEL 4007-137 RACK ADAPTER ASSEMBLY RACK CONFIGURATION: The rack adapter assembly is 19"W x 16 1/2"D x 7"H. It accommodates one Model 843 power supply module and seven Model 635 amplifier modules. REAR PANEL CONNECTORS: There are five types of termination on the rear of the rack, as follows: TAPE OUTPUT: One insulated BNC per amplifier channel.
Page 6: Specifications
III. SPECIFICATIONS MODEL 843 POWER SUPPLY MODULE DESCRIPTION: Both the input and output connections are made with a PC edge connector at the rear of the module. A fully shielded, toroidal power transformer allows the PS module to operate adjacent to a high-gain amplifier module without inducing 60Hz pick-up noise.
Page 7: Pcb Jumper Assignments
Connects +P to R for 1/4 or 1/2 STAT modes when using 2-wire gages. Remove for 3-wire gages. *Disconnect J7, 8, 10 and 11 to allow for remote sensing and calibration. (Use Encore Model 4007-139 Rack Adapter which is fitted with 10-pin bridge-input connectors.)
Page 9: Circuit Description
CIRCUIT DESCRIPTION MODEL 635 Reference is made to the circuit schematic D13555. The amplifier module provides both a main AC/DC channel and an auxiliary DC channel. Each channel incorporates a precision monolithic instrumentation amplifier in the first stage. The first stage of the main amplifier (U1) is followed by gain adjust stages (U2,U3), filter stage (U4) and output buffer stages U5, U6, and U7.
Page 10 MODEL 635 RACK BRIDGE/AMPLIFIER INPUT CONNECTOR (PT02A-10-6S) ASSIGNMENT +P BRIDGE -P BRIDGE R BRIDGE/SHIELD +S BRIDGE -S BRIDGE CHASSIS GROUND *MATES WITH PT06A-10-6P (SR) DC CHANNEL OUTPUT CONNECTOR ASSIGNMENT DC OUTPUT COMMON SHIELD GROUND *MATES WITH PT06A-8-3S (SR)
Page 11 MODEL 635 MODULE PCB EDGE CONNECTOR FINGER ASSIGNMENT FINGER ASSIGNMENT CHASSIS GND (F.P.) BUSS---------------------------------------------A C GND PLANE +S SENSE +P SENSE -P SENSE 10 MONITOR OUT 11 DC OUT 12 ----------------------------BUSS---------------------------------------------N GND PLANE (AMP COM) 13 BAL. 14 TAPE OUT 15 -24 AMP BUSS--------------------------------------------------------------S 16 COM AMP BUSS-----------------------------------------------------------T 17 +24 AMP BUSS-------------------------------------------------------------U...
Page 12 RACK MONITOR OUTPUT CONNECTOR PT02A-14-18S ASSIGNMENT CHANNEL 1 MONITOR OUTPUT HIGH " " " " " " " " " " " " " " " " " " " " CHANNEL 7 MONITOR OUTPUT HIGH OUTPUT COMMON CHASSIS GROUND CHANNEL 1 BRIDGE +P "...
Page 13 MODEL 843 POWER SUPPLY MODULE (USED IN 635 RACK) FINGER ASSIGNMENT FINGER ASSIGNMENT 1 AC HOT AC NEUT 3 PWR GND ISO +24 (1) 4 ISO -24 (1) ISO COM (1) 5 ISO -24 (2) ISO +24 (2) ISO COM (2) 7 ISO -24 (3) ISO +24 (3) ISO COM (3)
Page 14: Setup Procedure
MODEL 635 SET-UP PROCEDURE 1. Allow the amplifier (RACK) to warm-up for at least one-half hour. 2. Connect bridge and select the BRIDGE configuration, ie: 1/4 STAT, with the front panel rotary switch. Select the required bridge completion resistors, either 120Ω or 350Ω with the front panel toggle.
Page 15 8. With the excitation ON, press the auto-balance button. The BAL LED should extinguish and the DC outputs of both the main and DC channels should be zero volts. (Not applicable in the 1/4 DYN mode.) 9. With the amplifier in the DC CAL mode and the excitation set to the selected level, adjust the gain for the desired full-scale output voltage.
Page 16: Acceptance Test Procedure
ACCEPTANCE TEST PROCEDURE FOR MODEL 635 TURN-ON: With the bridge excitation voltage set to 5V & on, the bridge mode switch at "FULL," gain at X1000, gain- trim fully CW, and a 120 ohm full bridge connected to the bridge-input connector and monitor the OUTPUT BNC with an oscilloscope and DVM.
Page 17: Acceptance Test Data Sheet
MODEL 635 ACCEPTANCE TEST DATA SHEET SN:____________ BY:___________ DATE :____________ 1.0 NOISE: 2.0 ZERO: MONITOR OUTPUT:_______________ _______________ TAPE OUTPUT:_______________ _______________ DC OUTPUT:_______________ _______________ 3.0 AUTO-BALANCE CHECK: TURN-ON POWER PRESET AMPLIFIER AUTO-BALANCES UNSUCCESSFUL BALANCE INDICATION AUTO-BALANCE WITHIN _________mV 4.0 GAIN: 1 2 5 10 20 50 100 200 500 1K 2K 5K MAIN CHANNEL: DC CHANNEL:...
Page 18: Mechanical Inspection
9.0 BRIDGE COMPLETION VALUES: 120 OHM POSITION:__________________ 350 OHM POSITION:__________________ 10.0 CAL RESISTOR VALUES:* 11.88K POSITION: ____________________ 19.88K POSITION: ____________________ 49.00K POSITION: ____________________ 99.00K POSITION: ____________________ *MAY VARY SLIGHTLY DUE TO OTHER CIRCUITRY 11.0 GAIN VERNIER: GAIN CW GAIN CCW 12.0 MECHANICAL INSPECTION:...