MKS 270C Instruction Manual
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MKS 270C Instruction Manual

MKS 270C Instruction Manual

High accuracy signal conditioner
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  • Page 1 (217) 352-9330 | Click HERE Find the MKS Instruments 270C-4 at our website:...
  • Page 2 !IL • M K S Instruction Manual TYPE 270C HIGH ACCURACY SIGNAL CONDITIONER S I X S H A T 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...
  • Page 3 TABLI O F CONT' NTS ct ion Descr otio Section Section O p e r a t i o n Section of Operatio Sectio M a i n t e n a n c e and Troubleshooting Section Lists LIST OF F GORE. Fig ire I n t e r c o n n e c t i o n Cables e I Control Panel Controls...

  • Page 4: Section 1 General Description

    MODEL DIFFERENCES 270B TO 270C The 270B has been replaced by the 270C. The only differences between the two units is found in the power input components. The changes are: 1. T h e power line input connector, line voltage selector switch and fuse holder have been replaced by a single Power Entry Module which is UL/CSA and VDE approved.

  • Page 5: Specifications

    SPECIFICATIONS Input: Accepts signals from 398, 390, 370, 310, 315, and 317 pressure sensors, 25K to 1 mmHg. Ranges: X1, X0.1 and X0.01 of full range of the pressure sensor. Output Voltage: 0 to +10V into 10K ohms or greater, available at rear connectors. Display: 41/2 Digit in 270-4 51/2 Digit in 270-5, 7 segment red LED's, 0.5 inches high.

  • Page 6: Section 2 Installation And Operation

    Section 2 INSTALLATION AND OPERATION INSTALLATION THE 270 MUST BE MOUNTED IN SUCH A MANNER AS TO PROVIDE ADEQUATE AIR CIRCULATION 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 instruments.
  • Page 7 INTERCONNECTION DATA J401 ACCESSORY CONNECTOR Pin No. Pin No. 8. DC Output Return 1. DC Output Voltage 9. N.C. 2. N.C. 10. N.C. 3. Digital Common 4. X1 Range ID 11. N.C. 12. N.C. 5. X0.1 Range ID 13. N.C. 6.
  • Page 8 49. + 5 Volt Ground 16. 1 0 33. 8000 50. CH.2 ID 17. Enable Digit 1 34. Enable Remainder *Used only by MKS. 270-5 BCD OUTPUT CONNECTOR (51/2 DIGIT DPM) 1. 8000 18. + 5 V 0 2 5 mA 35.

  • Page 9: Data Ready

    OVERRANGE OUTPUT ON THE 51/2 DIGIT DPM The panel meter used by MKS overranges at 130000 counts. This would normally cause it to flash on and off. Since this would not allow the proper full scale reading in mbars, Kpa or cmH20 the flashing feature has been disabled.

  • Page 10: Section 3 Operation

    Section 3 OPERATION FRONT PANEL CONTROLS (See Figure B) RANGE SELECT (A) This switch controls the measurement mode of the instrument. The Remote, X1, X0.1 and X0.01 positions are active measurement ranges while the System Check, Null and Full Scale are functional check positions. NULL (B) When the range switch is placed in the NULL position, the input to the 270 is placed at ground level.
  • Page 11 DISPLAY UNITS SELECTOR (K) This switch selects the type of units used to display pressure on the front panel display. X10-3 LAMP (L) Since it is not possible to display the decimal point to the left of the MSD, a Full Scale reading of +.10000 is displayed as +100.00 and the X10-3 lamp is illuminated.
  • Page 12 FIGURE B FRONT PANEL CONTROLS T Y P E 2 7 0 P R E S S U R E 010.1 x l a sacova CONDITIONER REMOTE ZERO mmHg R o l m 11( 1 0 0 n 1-1 1-1 1-1 P H I °...
  • Page 13 Figure B-item D&E. Should these controls lack the range for this adjustment, refer to the Zero and Span adjustment section in the MKS Instruction Manual for 170 Series Sensors. NOTE: SHOULD A MULTIPLEX UNIT BE IN USE, THE ABOVE CONTROLS ARE BYPASSED AND THE ZERO CORRECTION IS DONE AT THE MULTIPLEX UNIT.
  • Page 14 • REMOTE RANGE SELECTION The X1, X0.1 & X0.01 ranges can be remotely selected by placing the Range Select in the Remote position and applying the proper logic levels to the Remote interface connector. RANGE TO BE SELECTED R E M O T E CONNECTOR J402-3 J 4 0 2 - 4 0.01 NC•...

  • Page 15: Section 4 Theory Of Operation

    Section 4 THEORY OF OPERATION The first portion of this section will deal with the signal flow through the instrument while later portions will cover the operation of specific circuits in more detail. Referring to Figure D, it is seen that the 270 interfaces with the pressure sensor via the sensor connector. This connector also provides the preamp voltage, heater voltage and oscillator voltage to run the pressure sensor.
  • Page 16 ,1-:15 i r i i i 1111-2-11-11- )11--a • • Pressure Input Demodu- Divider Zero Signal Selector AC amp lator .•••••••110.1 Circuit AC amp Circuit (Sensor) Switch Pressure Signal Accessory (mux) Connector Response Range System Selection Time Check Circuit Circuit Display CAC and Pre Amp...
  • Page 17 At the output of each supply there is a jumper bus. This bus doubles as a test point and a means of isolating the power supply when troubleshooting the circuit. CAUTION: To avoid damage to internal circuits, never operate the instrument with one power supply disconnected.
  • Page 18 The rectified signal then passes through to the input of the DC integrator U11 which filters and amplifies the waveform to produce a noise free DC output signal. The signal is adjusted to the proper full scale of 10 volts with the coarse span adjust R70 and is filtered once more by L1 and C37 and then applied to the proper output connectors.

  • Page 19: Section 5 Maintenance And Troubleshooting General

    Should any difficulties be encountered in the use of your instrument, it is recommended that you contact any author- ized MKS Sales Office or Home Office for repair instructions. IF IT IS NECESSARY TO RETURN THE INSTRUMENT TO MKS FOR REPAIR, PLEASE CONTACT MKS' CUSTOMER SERVICE REPRESENTATIVE AT THE NEAREST MKS SERVICE CENTER FOR AN ERA NO.
  • Page 20 TEST A LOCALIZING MALFUNCTION TO CABLE OR ELECTRONICS UNIT Equipment required: VOM 1. Disconnect the sensor from the 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 pin H (2)* SENSOR CABLE VOLTAGE CHECKS SENSOR CABLE...
  • Page 21 6. Connect a short circuit across the 1K resistor and place the RANGE SELECTOR in the X0.01 position. Adjust the COARSE zero control. It should be possible to adjust this control ± 40% of full scale. TEST B LOCALIZING MALFUNCTIONS TO ELECTRONICS UNITS 1.

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