This example is intended to illustrate the technical documentation of an electronic design produced by AIRBORN ELECTRONICS. Most of the technical drawings in this page have been reduced in resolution so they can be viewed easily. The full sized diagrams may be downloaded from our circuit collection.
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RCM710 ELECTRONIC SCALE
Technical Design Manual
RCM Weighing
SCALES & ENGINEERING SUPPLIES
Contents:
Document Part 1
- Specification
- Circuit diagrams: RCM710 Main CPU
- Parts List
- Parts Key and Packages
- Specific Parts notes
- Front Panel art
Document Part 2
- RCM710 Interboard connector (CN15 Lead)
- Factory only adjustment #5
- RCM710 Connector pinouts
- 87C552 Pinout definition, as used in RCM710 project
- Drilling diagram: RCM710 CPU
- Overlay diagram: RCM710 CPU
- Circuit diagram: RCM710 Keyboard/Display PCB
- Parts List: Keyboard/Display PCB
- Drilling diagram: RCM710 Keyboard/Display
- Overlay diagram: RCM710 Keyboard/Display
- Overlay diagram: RCM710 CPU, colour
RCM710 Digital indicator specification (Revised)
Standard Features
- The RCM710 setup functions and calibration sequences are programmed through the in-built keyboard and display. Setup and calibration may be disabled by an internal hardware jumper.
- Displayed resolution: Up to 1 part in 10,000.
- Automatic zero maintenance: Maintains a stable zero.
- Push-button zero: Zeros the gross value to within plus/minus 2% of the capacity of the scale
- Digital filter: Provides the ability to digitally compensate for extreme motion or vibration.
- Automatic weight identification: Net, Gross and Zero indication is provided via the display.
- Keyboard enterable Tare.
Specifications
- Display:
- 6 digits or 5 digits with a leading minus sign. The display is a blue-green vacuum fluorescent type, with characters 13mm high.
- Decimal point location:
- Setup through the keyboard to display:
XXXXX0
XXXXXX
XXXXX.X
XXXX.XX
XXX.XXX
XX.XXXX
- Increment size ('Count by'):
- X1,X2,X5,X10,X20 or X50 (Maximum set by Full Scale Increments)
- Full Scale Increments:
- Choice of: 1000,2000,2500,3000,4000,5000,6000,8000 and 10000.
- Zero Indication:
- "Zero" indicator illuminates when scale is within +/-0.25 increment of gross zero.
- Over capacity:
- Display will blank if scale is over 2 increments above programmed scale capacity.
- Under zero display:
- Display will blank if scale is 2 increments under zero.
- Initial/Span range:
- Initial range is 0 to 20 millivolts; span range is 5 to 30 millivolts, both referenced to a 30 millivolt load cell output. The span range may be increased to 45 millivolts for use with 3mv/V load cells through an internal shorting jumper.
- Sensitivity:
- 0.50 microvolts per increment minimum.
- Resolution:
- Up to 1 part in 10,000 displayed, Up to 1 part in 100,000 internal.
- Load Cell Excitation:
- Provided for up to six 350 ohm or eight 725 ohm load cells. Load cell excitation voltage is nominal 12.5 volts.
- Stability:
- [To be determined by NSC test]
- Operating range:
- [To be determined by NSC test]. Target: -10 to 40 degrees Celsius at 10 to 95% relative humidity, non-condensing.
- Motion detection:
- The Zero and Tare functions are inhibited while the weight display is changing.
- Automatic zero maintenance:
- Weight indication within +/- 0.1 increments of the centre of zero is compensated to zero. Total compensation range is 4% of full scale. Weight variations which occur at a rate of 0.1 increments per second or slower will be compensated.
- Digital Filter:
- Selectable (through the keyboard) to reduce the effects of vibration and extreme motion. 4 settings are available.
- Display Verification:
- Depressing the "test" button causes a test pattern to appear on the display, testing all segments, decimal points and arrows for correct operation.
- Tare:
- Tare entry and operation may be disabled by programming.
- Power requirements:
- 240VAC 50Hz. Power consumption is 15 watts (or less).
Revised RCM710 Digital indicator specification. 24 February 1994
RCM710 CPU Board Parts list
RCM1_1.PCB 22:28 17-8-1996 PCB Parts List
A1 LOGO1
BR1 1A 100V WO-1
BR2 1A 100V WO-1
BR3 1A 100V WO-1
BR4 1A 100V BR WO-1
C1 0.2UF FILM RAD0.3
C2 47NF FILM RAD0.3
C3 22NF FILM RAD0.3
C4 0.15 P1840 RAD0.4
C5 22UF16V TN RB.1/.2
C17 22UF16V TN RB.1/.2
C18 22UF16V TN RB.1/.2
C6 220PF RAD0.1
C7 100PF RAD0.1
C8 100PF RAD0.1
C9 0.1UF RAD0.1
C10 0.1UF RAD0.1
C11 0.1UF RAD0.1
C12 0.1UF RAD0.1
C13 0.1UF RAD0.1
C26 0.1UF RAD0.1
C27 0.1UF RAD0.1
C28 0.1UF RAD0.1
C34 0.1UF RAD0.1
C35 0.1UF RAD0.1
C36 0.1UF RAD0.1
C14 470UF 63V RB.3/.6
C15 2200UF 35V RB.4/.8
C16 4700UF 16V RB.4/.8
C19 10UF25V TN RB.1/.2
C20 10UF25V TN RB.1/.2
C21 10UF25V TN RB.1/.2
C22 10UF35V RB.2/.4
C23 33NF RAD0.2
C24 33NF RAD0.2
C25 2.2UF 50V RB.1/.2
C29 22PF RAD0.2
C30 22PF RAD0.2
C31 2.2UF 16V RB.1/.2
C32 3.3NF RAD0.2
C33 0.5F SUPER SUPERCAP
CN1 TRANSFORMER PHOENIX10H
CN2 LOAD CELL PHOENIX8H
CN3 BUS COM'S PHOENIX3H254
CN4 FEATURE PCB SIP8
CN5 RELAY PCB SIP8
CN6 PRINTER PCB SIP6
CN7 ANCILL RS232 PCB SIP8
CN8 SYSTEM RS232 PCB SIP8
CN9 I2C CONN A SIP5
CN10 I2C CONN B SIP5
CN11 PRINT SW PHOENIX4H254
CN12 ANOUT SIP4
CN13 CHASSIS POST SPADE
CN14 ALT LC PCB SIP10
CN15 DISPLAY-KEYBOARD IDC26
CN16 VTEST SIP2
D1 BAW62 DIODE0.3
D2 BAW62 DIODE0.3
D10 BAW62 DIODE0.3
D11 BAW62 DIODE0.3
D12 BAW62 DIODE0.3
D14 BAW62 DIODE0.3
D17 BAW62 DIODE0.3
D18 BAW62 DIODE0.3
D19 BAW62 DIODE0.3
D4 6.8V 400MW DIODE0.4
D5 15V 1.3W DIODE0.7
D6 15V 1.3W DIODE0.7
D7 LM385Z2.5 TO-92A
D8 1N4002 DIODE0.4
D9 1N4002 DIODE0.4
D13 5.6V 400MW DIODE0.3
D15 10V 1.3W DIODE0.4
D16 5.6V 1.3W DIODE0.4
IC1 LTC1051 DIP8
IC2 LTC1051 DIP8
IC3 LTC1051 DIP8
IC4 TLC2274 DIP14
IC5 LM339 DIP14
IC6 4051 DIP16
IC7 4053 DIP16
IC8 74HCT74 DIP14
IC9 87C552 PLCC68SKT
IC10 PCF8583A DIP8
IC11 PCF8582A DIP8
IC12 75176 DIP8
J1 LDCELL LNK SIP3
J2 PROG LINK SIP3
J3 TERMIN LNK SIP3
LED1 RED DIAG LED LED5
LED2 GRN DIAG LED LED5
R1 100K 0.1% AXIAL0.4
R2 100K 0.1% AXIAL0.4
R5 100K 0.1% AXIAL0.4
R8 100K 0.1% AXIAL0.4
R3 1K AXIAL0.4
R4 1K AXIAL0.4
R11 1K AXIAL0.4
R12 1K AXIAL0.4
R19 1K AXIAL0.4
R21 1K AXIAL0.4
R44 1K AXIAL0.4
R46 1K AXIAL0.4
R59 1K AXIAL0.4
R60 1K AXIAL0.4
R6 750E 0.1% AXIAL0.4
R7 750E 0.1% AXIAL0.4
R9 3K 0.1% AXIAL0.4
R10 475K AXIAL0.4
R14 475K AXIAL0.4
R13 59K AXIAL0.4
R15 243K AXIAL0.4
R16 10K AXIAL0.4
R20 10K AXIAL0.4
R28 10K AXIAL0.4
R33 10K AXIAL0.4
R17 ?? 0.1%15P AXIAL0.4
R18 30K EST. AXIAL0.4
R22 500K AXIAL0.4
R23 500E AXIAL0.4
R24 5K AXIAL0.4
R25 4.7K AXIAL0.4
R26 4.7K AXIAL0.4
R38 4.7K AXIAL0.4
R72 4.7K AXIAL0.4
R27 1M AXIAL0.4
R76 1M AXIAL0.4
R34 27K AXIAL0.4
R35 22K AXIAL0.4
R36 22K AXIAL0.4
R37 22K AXIAL0.4
R58 22K AXIAL0.4
R68 22K AXIAL0.4
R69 22K AXIAL0.4
R70 22K AXIAL0.4
R71 22K AXIAL0.4
R73 22K AXIAL0.4
R74 22K AXIAL0.4
R75 22K AXIAL0.4
R39 1.2K 1% AXIAL0.4
R54 1.2K 1% AXIAL0.4
R40 110E 1% AXIAL0.4
R49 110E 1% AXIAL0.4
R51 110E 1% AXIAL0.4
R53 110E 1% AXIAL0.4
R41 1.8E AXIAL0.4
R42 1.5E AXIAL0.4
R43 180E AXIAL0.4
R45 47K 1% AXIAL0.4
R47 47K AXIAL0.4
R48 47K AXIAL0.4
R50 3K 1% 0.5W AXIAL0.4
R52 330E 1% AXIAL0.4
R56 56K AXIAL0.4
R57 2.2M AXIAL0.4
R61 220E AXIAL0.4
R62 100E AXIAL0.4
R63 10E FUSIBLEX3 AXIAL0.4
R64 10E FUSBLE AXIAL0.4
R65 10E FUSBLE AXIAL0.4
R66 1.5K AXIAL0.4
R67 1.5K AXIAL0.4
R77 10K 0.1% AXIAL0.4
R78 10K 0.1% AXIAL0.4
R79 10K 0.1% AXIAL0.4
R80 30K 0.1% AXIAL0.4
R81 30K 0.1% AXIAL0.4
R82 30K 0.1% AXIAL0.4
SIP1 10K SIP9
TR1 BC337 TO-92A
TR2 BD140 TO-126
TR3 BC549C TO-92A
TR4 BC549C TO-92A
TR5 MPSA13 TO-92A
VDR2 D223512-22 TO-92A
VR1 LM317T TO-220
VR2 LM317T TO-220
VR3 LM317T TO-220
VR4 LT1021 DIP8
VR5 LM317LZ TO-92A
XTAL1 11.0592MHZ XTAL1
XTAL2 32.768KHZ XTAL32
Total Components = 183
Additional parts:
- 68 pin PLCC socket, pin grid array type, gold flash for part 87C552
- 8 pin DIP IC socket, turned pin machine screw type for part 75176
- Shorting plugs for each of the "Jxx" jumpers, 0.1 inch pitch two pin gold plated
- Mating connectors for CN1, CN2, CN3, CN11 as detailed in "Specific parts notes"
- Cable assembly per "CN15 interboard connector" specification
- PCB Laminates, RCM710 CPU AB9301027 and Keyboard-display AB9301027
- Transformer, per "RCM710 Transformer specification"
- Mains Filter Roxburgh RX730AE or equivalent
- Mains VDR Philips 2322 595 52716 or equivalent
- 4 Way covered mains wiring block
- 15 Amp 32mm fuse holder, chassis mount
- 1 Amp 240v 32mm fuse
Part Key:
- BRxx
- Bridge Rectifier
- Cxx
- Capacitor
- CNxx
- Connector
- Dxx
- Diode
- ICx
- Integrated circuit
- Jxx
- Selection jumper (3 0.1 inch pitch posts and one shorting plug)
- LEDxx
- Light emitting diode
- Qxx
- Transistor
- Rxx
- Resistor
- Sxx
- Switch
- SIPxx
- SIP resistor network (Resistors to one common terminal, pin 1)
- TRxx
- Transistor
- VRxx
- Voltage regulator
- XTALxx
- Crystal
Packages:
- Axial0.4
- Axial package, lead pitch 0.4 inches when formed
- Diode0.3
- Polarised axial package, lead pitch 0.3 inches when formed
- Diode0.4
- Polarised axial package, lead pitch 0.4 inches when formed
-
- Diode0.7
- Polarised axial pack, lead pitch 0.7 inches, body width 5.5mm
- DIP8
- 8 pin dual in line package
- DIP14
- 14 pin dual in line package
- DIP16
- 16 pin dual in line package
- DIP18
- 18 pin dual in line package
- FIP6A13A
- NEC Fluro display, 0.1 inch lead pitch, 20 pin, special pack
- IDC26
- 26 Way 0.1 x 0.1 inch dual row horizontal connector for IDC
- IRRX
- Special IR rx package, 3 pin (like TO-92) 0.1 inch lead pitch
- LDR
- Special LDR package, radial, 5mm lead pitch
- LED5
- 5mm diameter 2.5mm pitch LED (Note 3mm dia LEDs also fit holes)
- Key-Sw
- 12mm square tactile push button, 5mm x 12.6mm mounting pitch
- Phoenix3H
- 3 Way 0.2 inch pitch horizontal connector (Can take an unpluggable screw terminal connector if required)
- Phoenix4H
- 4 Way 0.2 inch pitch horizontal connector (Can take an unpluggable screw terminal connector if required)
- Phoenix8H
- 8 Way 0.2 inch (Note: Not 5mm) pitch horizontal connector (Can take an unpluggable screw terminal connector if required)
- Phoenix10H
- 10 Way 0.2 inch (Note: Not 5mm) pitch horizontal connector
- PLCC68Skt
- 68 pin PLCC socket, 0.1 x 0.1 inch pitch pin grid
- RAD0.1
- Radial leaded package, lead pitch 2.5mm
- RAD0.2
- Radial leaded rectangular package, 5mm lead pitch
- RAD0.3
- Radial leaded rectangular package, lead pitch 0.3 inches
- RAD0.4
- Radial leaded rectangular package, lead pitch 0.4 inches
- RB.1/.2
- Polarised radial package, diameter 5mm or less, lead pitch 2.5mm
- RB.2/.4
- Polarised radial package, diameter 10mm or less, lead pitch 5mm
- RB.3/.6
- Polarised package, diameter 15mm or less, lead pitch 0.3 inches
- RB.4/.8
- Polarised package, diameter 20mm or less, lead pitch 0.4 inches
- SIP2
- 2 Way 0.1 inch pitch single row package
- SIP3
- 3 Way 0.1 inch pitch single row package
- SIP4
- 4 Way 0.1 inch pitch single row package
- SIP5
- 5 Way 0.1 inch pitch single row package
- SIP6
- 6 Way 0.1 inch pitch single row package
- SIP7
- 7 Way 0.1 inch pitch single row package
- SIP8
- 8 Way 0.1 inch pitch single row package
- SIP9
- 9 Way 0.1 inch pitch single row package
- SIP10
- 10 Way 0.1 inch pitch single row package
- Spade
- PCB Mount 5mm pitch two prong mounting brass spade terminal
- Supercap
- Polarised package, 21mm diameter, lead pitch 5mm
- TO-92A
- Standard TO-92 package mounted on 0.1 x 0.1 inch pitch pads
- TO-126
- Standard TO-126 package, mounted on 0.1 inch pitch lead spacing
- TO-220
- Standard TO-220 package, 0.1 inch pitch leads, M3 mounting screw
- VR1
- 10 turn horizontal long body preset pot, 12.6mm pin spacing
- WO-1
- Bridge rectifier, 10mm diameter, lead pitch 0.2 x 0.2 inch
- XTAL1
- Standard HC49 crystal can, vertical mount (horizontal if space)
- XTAL32
- Watch crystal
Specific parts notes:
- Capacitors suffixed by "Tn" are tantalum type.
- Capacitors C14, C15 and C16 should not exceed 32mm in length or 16mm in diameter
- Capacitors with higher voltages may be substituted, provided they physically fit
- Do not substitute P1840 capacitor. Each brand requires approval.
- Parts 0.5F supercap, 32khz crystal and PCF8583A are only required for Clk option
- PCF8583A is a Philips part
- CN1 is to be 0.2 inch pitch wafer connector, not 10 way screw terminal
- Kit both PCB mount socket and screw terminal plug for CN2, CN3, CN11
- See connector pinouts for suggested connector part numbers, details are:
- CN1 10 Way 0.2 inch pitch wafer connector
- CN2 8 Way 0.2 inch pitch Weidmuller-Klippon SL8-H or equivalent
- CN3 3 Way 0.2 inch pitch Weidmuller-Klippon SL3-H
- CN11 4 Way 0.2 inch pitch Weidmuller-Klippon SL4-H
- CN15 26 Way 0.1 x 0.1 inch Insul. Displacement connector, Fujitsu FCN744P034AUR
- CN4,5,6,7,8,9,10,12,14,16,J1,J2,J3 0.1 inch pitch gold plated single row posts
- Diodes that specify just voltage and wattage (e.g. "15V 1.3W") are zener type
- Diode type 1N4002 may be replaced with 1N4003-1N4007
- Device 87C552 needs to be programmed prior to insertion into the 68 pin PLCC pin grid array socket
- LEDs should be water clear package super/ultra bright or high intensity
- All resistors are 1% 0.25w metal film type unless otherwise specified
- Substitution of standard resistors where fusible types are specified could cause a fire hazard or damaged circuitry under fault conditions
- VDR2 D223512-22 is a Murata part
- All ICs are DIP plastic package types, unless otherwise specified
- LT1021 is a linear technology voltage reference part - type LT1021CN-8
- LTC1051 is a linear technology chopper amplifier part - type LTC1051CN-8
- TLC2274 is a Texas Instruments premium op-amp part - type TLC2274ACN
- LM339 should be substituted with LM339AN where possible
- PCF8582A is a Philips 256 x 8 i2c EEPROM, or Arizona 85C82P. Do not use 93C56.
- 75176, use SN75176AP or LTC485, but is only necessary for RS485 option
- Each brand of 4051/4053 may have to be tested for RON variation before approval
- 11.0592MHz crystal is an AT-cut part
- 32.768kHz crystal is a standard watch part
- FIP6A13A is made by NEC
- SA594 may be substituted with NE594, HA16617P, (M54564P with link changes)
- Key-Sw is type SKHKAA, many types are physically compatible
- IRRX is type Sharp IS1U60, but is only necessary for IRRX option
- Piezo is murata PKM22EPP-4001 or physically compatible sounder (NOT buzzer)
- LDR is NSL19-MS51 type, but is only necessary for LDR option
- Dew sensor is two gold plated 0.1 inch posts mounted with epoxy on plastic sheet with flying leads, and is only necessary for dew sensor option
- Tilt switch is Farnell part number 170855, and is only necessary for tilt option
- NTC is Philips part number 2322-640-66472, and is only necessary for NTC option
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