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MKS Instruments 270C-4

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Summary of Contents for 270C

Page 1: ...underutilized and idle equipment along with credit for buybacks and trade ins Custom engineering so your equipment works exactly as you specify Critical and expedited services Leasing Rentals Demos I...

Page 2: ...Instruction Manual I I i I TYPE 270C HIGH ACCURACY SIGNAL CONDITIONER SIX S H AT T U C K R O A D A N D O V E R M A S S A C H U S E T T S 0 1 8 1 0 x 5 0 8 9 7 5 2 3 5 0 T E L E X 9 1 0 2 4 0 9 0 0 5 F...

Page 3: ...Troubleshooting 5 1 Section P a r t s Lists LIST OF F GORE Fig ire I n t e r c o n n e c t i o n Cables 2 i Fig o n t e I Control 3 3 Fig C R e a r Panel Controls 3 3 Fi i r e D 2 7 0 Block Diagra 4...

Page 4: ...CCURACY SIGNAL CONDITIONER Section 1 GENERAL DESCRIPTION The 270 is a complete signal conditioner and 41 2 or 51 2 digit display packaged in the standard MKS 1 2 rack mount unit This unit contains the...

Page 5: ...logic Decimal points channel ID and range ID outputs are buffered TTL levels All outputs can drive 1 TTL load 1 2rack size cabinet 8 lbs Operating Temperature 1 5 to 40 C Operating Voltage Power Consu...

Page 6: ...ULATION ABOUT THE UNIT The 270 can be mounted in a panel cutout or a 19 rack when supplied with the RM 6 Rack Mount option FIGURE A shows the cables necessary to connect between the 270 and other inst...

Page 7: ...C 4 100 17 N C 5 10 18 N C 6 1 19 N C 7 N C 20 N C 8 CH 1 ID Input 21 Remote Read 9 CH 2 ID Input 22 Digital Ground 10 CH 3 ID Input 23 Digital Ground 11 Multiplex Select 24 N C 12 N C 25 Chassis Grou...

Page 8: ...t 2 8 1 9 N C 10 100 11 200 12 40 13 400 14 20 15 1000 16 10 17 Enable Digit 1 Used only by MKS 270 4 BCD OUTPUT CONNECTOR 41 2 DIGIT DPM 18 5 V 025 mA 19 HOLD 20 Good Data 21 Decimal 4P 22 Decimal 3P...

Page 9: ...d when the DATAREADY line goes high When these lines are left open or connected to 5V then all of the BCD outputs are open This is done when several meters are connected in parallel to a common bus Ea...

Page 10: ...he Sensor Coarse Zero to provide an approximate zero setting SENSOR ZERO FINE E This control is used in conjunction with the 270 Coarse Zero to provide high resolution in the zero setting HEATER F Thi...

Page 11: ...in this connector to receive excitation heater power etc POWER ENTRY MODULE D This module contains 1 RFI power line filter 2 IEC power line connector 3 Line voltage selector 4 Power line fuses 2 The f...

Page 12: ...R 1 S T D SLOW R E S P O N S E O 010 1 x l a T Y P E 2 7 0 sacova CONDITIONER 11 1 0 0 1 OAPS mmHg R o l m P H I 1 A P B a S S E N S O R R A N G E D I S P L A Y U N I T S REW TE X I M O W x l 1 X 01 O...

Page 13: ...item H to the STD position This provides the best all around response vs noise for pressure measurement When using a series 200 controller use the FAST position The SLOW position is used when low noi...

Page 14: ...2 4 1 HI HI 0 1 LO HI 0 01 HI LO REMOTE RANGE SELECTION 114 NC I q ray 10 it le The X1 X0 1 X0 01 ranges can be remotely selected by placing the Range Select in the Remote position and applying the p...

Page 15: ...e oscillator to block quadrature signals The DC amplifier acts as an integrator and filters the input signal to produce a smooth DC output signal This circuit also has a Response Speed Selector switch...

Page 16: ...p Divider Circuit Heater Controls 13v 13v 1 3 Ana Gnd 13 5v G n d Digital Gnd 40v 40v CAC and Zero XFMR Range Selection Circuit 2nd AC amp Demodu lator 10 KHz Oscil lator Multiplex Connector Digital I...

Page 17: ...temperature regulated precision reference VR2 This reference voltage is applied to the positive input of the integrating amplifier U14 The negative input of this amplifier is connected to precision h...

Page 18: ...ranges The command to select the X0 1 or X0 01 range by the range switch is done by applying a ground closure via S1 while the REMOTE position is left in the hi state to LOCKOUT any commands from the...

Page 19: ...overranged 11V or otherwise suspect make the checks listed below Check to be sure that all vacuum fittings are tight and that the sensor is properly pumped down Low range absolute sensors 100mmHg and...

Page 20: ...sensor cable 2 Place the RANGE SELECTOR in the system check position 3 Place the REG switch in the OFF position 4 Use the VOM to check the voltages at the sensor end of the cable Reference the VOM to...

Page 21: ...ecessary to perform the following calibration check 1 Adjust the NULL for a zero setting 2 Place the DIPSLAY UNITS SELECTOR in the mmHg position 3 Switch the RANGE SELECTOR to the F S position and adj...

Page 22: ...uipment Have surplus equipment taking up shelf space We ll give it a new home Learn more Visit us at artisantg com for more info on price quotes drivers technical specifications manuals and documentat...

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