Related Manuals for Polar Instruments CITS100
Summary of Contents for Polar Instruments CITS100
- Page 1 Polar Instruments Ltd. CITS100–500s Service Manual Polar Instruments Ltd. Garenne Park St. Sampson Guernsey Channel Islands GY2 4AF ENGLAND http://www.polar.co.uk Fax: +44 (0)1481 252476 Email: mail@polar.co.uk MAN 143-9910...
- Page 2 CITS SERVICE MANUAL POLAR INSTRUMENTS LTD. HARDWARE WARRANTY Product Warranty. Product hardware is warranted to be free from defects in material and workmanship during the Warranty Period (as defined below). Product hardware is warranted to conform substantially to Polar’s then current (as of the date of Polar’s product shipment) published user...
- Page 3 DECLARATIONS European Community Directive Conformance Statement Refer to the Operator Manual to determine conformance with European Community Directives. DECLARATIONS • • • • i CITS Service Manual...
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Page 4: Safety
SAFETY WARNING The service instructions contained in this manual are for use by qualified electronic service personnel only. WARNING The LIVE and NEUTRAL lines on this unit are BOTH fused. When the unit is connected to its supply, the opening of covers or removal of panels is likely to expose dangerous voltages. -
Page 5: Power Supply
Use only the accessories (e.g. test probes and clips) provided by Polar Instruments. The instrument must be maintained and repaired by a skilled electronics technician in accordance with the manufacturer’s instructions. -
Page 6: Caution
CAUTION Electrical Isolation Always disconnect the board under test from the local mains supply (including ground) before using this instrument. Static Sensitive Devices This unit contains Static Sensitive Devices. Static discharge can damage some electronic components. Care must be taken when handling these components. Observe appropriate precautions to avoid damage. -
Page 7: Specifications
SPECIFICATIONS Test parameters Controlled Impedance Measurement Range 0 – 300Ω Measurement Accuracy 1% at 50Ω Measurement Accuracy CITS500s (32 bit) 1% at 50Ω 1.25% at 75Ω 1.5% at 28Ω and 100Ω Vertical Display Ranges 1, 2, 5, 10, 20, 50Ω/division Horizontal Display Ranges Automatically set by software Testable Trace Lengths... -
Page 8: Environmental Operating Conditions
ENVIRONMENTAL OPERATING CONDITIONS The instrument is designed for indoor use only under the following environmental conditions: Altitude Up to 2000m Temperature +5°C to +40°C ambient Relative humidity RH 80% maximum at 31°C — derate linearly to 50% at 40°C Mains borne transients As defined by Installation Category II (Overvoltage Category II) in IEC664 Pollution Degree... -
Page 9: Symbols
SYMBOLS CAUTION No external voltage should be applied to these terminals. CAUTION Static sensitive devices — observe static precautions. On later instruments a wrist strap is provided with the CITS (connect the wrist strap to the stud on the CITS rear panel). Note: The CITS contains static sensitive devices —... -
Page 11: Table Of Contents
SYMBOLS PERFORMANCE CHECKING MAINTENANCE AND CALIBRATION OF INSTRUMENTS .....1 Performance Check ...............1 Calibration Procedure ............1 Recommendations for Routine Maintenance......1 CITS100/200 PERFORMANCE CHECK PERFORMANCE CHECK (QUICK) ..........3 Equipment required ...............3 Procedure ................3 Quick performance check test file listings......4 PERFORMANCE CHECK (FULL)............5 Equipment required: ..............5... - Page 12 CITS100/200 CALIBRATION PROCEDURE CALIBRATION PROCEDURE ............9 Equipment required............... 9 Procedure ................9 Impedance Check ..............9 Instrument Power Up Check ..........10 Adjust +12V supply on Main board ........10 Zero offset adjust (coarse) ..........10 Set up for Testing Operation with the PC......11 Configuring the system ............
- Page 13 CITS500s (32-bit) CALIBRATION PROCEDURE CALIBRATION PROCEDURE............27 Equipment required .............27 Instrument Power Up Check..........27 Adjust +12V supply on main board ........27 Check –12V supply on main board ........28 Set up for Testing Operation with the PC ......28 Run the CITS software ............28 Configure system..............28 Static Damage check............29 Zero offset adjust (fine)............29...
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Page 15: Performance Checking
PERFORMANCE CHECKING MAINTENANCE AND CALIBRATION OF INSTRUMENTS For most of Polar Instruments’ products there are two maintenance procedures — the Performance Check and the Calibration. Some instruments may have a single (combined) procedure. Performance Check The Performance Check (or Checkout Procedure) is used to verify the basic functions of the instrument. -
Page 17: Cits100/200 Performance Check
Check that a PASS is reported. 7. Repeat this step with the 75 Ω track using TEST75.TST. 8. Repeat again using the 100 Ω track and TEST100.TST. CITS100/200 PERFORMANCE CHECK • • • • 3 CITS Service Manual... -
Page 18: Quick Performance Check Test File Listings
100 Ω IMPEDANCE TOLERANCE PROBE LENGTH 45 Inches TEST FROM 3.5 Inches TEST TO 7 Inches DISTANCE UNITS Inches OHMS PER DIV LOSS COMPENSATION Default Default DIFFERENTIAL TEST METHOD Normal 4 • • • • CITS100/200 PERFORMANCE CHECK CITS Service Manual... -
Page 19: Performance Check (Full)
2. Select OK to confirm the settings. Test Airline 1. Select the test file AIRLINE.TST. 2. Use the foot pedal to perform a test. 3. Check that the test passes. CITS100/200 PERFORMANCE CHECK • • • • 5 CITS Service Manual... -
Page 20: Zero Offset Check
1. Connect a single SMA cable from one output of the CITS200 to the other. 2. Select the test file TERM.TST and perform a test. 3. Check that test results are displayed and PASS is reported. 6 • • • • CITS100/200 PERFORMANCE CHECK CITS Service Manual... -
Page 21: Full Performance Check Test File Listings
DIFFERENTIAL TEST METHOD Normal TERM.TST 50 Ω IMPEDANCE TOLERANCE PROBE LENGTH TEST FROM TEST TO DISTANCE UNITS Metres OHMS PER DIV LOSS COMPENSATION Default Default DIFFERENTIAL TEST METHOD Normal CITS100/200 PERFORMANCE CHECK • • • • 7 CITS Service Manual... -
Page 23: Cits100/200 Calibration Procedure
(For the CITS200 use the left hand connector which is labelled MAIN). 3. Check this is within the range 49.5 – 50.5 Ω. TP1030 R1042 CITS100/200 Front end CITS100/200 CALIBRATION PROCEDURE • • • • 9 CITS Service Manual... -
Page 24: Instrument Power Up Check
2. Set the oscilloscope as follows: • CH1 200mV/div vertical • DC coupling • 50 µs/div horizontal 3. Adjust trigger for a stable display similar to that shown below. 600mV 10 • • • • CITS100/200 CALIBRATION PROCEDURE CITS Service Manual... -
Page 25: Set Up For Testing Operation With The Pc
50 Ω IMPEDANCE TOLERANCE PROBE LENGTH 36 Inches TEST FROM 5.5 Inches TEST TO 7.5 Inches DISTANCE UNITS Inches OHMS PER DIV LOSS COMPENSATION Default Default DIFFERENTIAL TEST METHOD Normal CITS100/200 CALIBRATION PROCEDURE • • • • 11 CITS Service Manual... -
Page 26: Zero Offset Adjust (Fine)
5. Perform a test using the foot pedal to initiate testing. Check that a waveform similar to that shown in the diagram below is displayed and the software reports PASS. 12 • • • • CITS100/200 CALIBRATION PROCEDURE CITS Service Manual... -
Page 27: Calculate Calibration Constant
49.90 Ω ) on the calibration constant label on the CITS rear panel. Select Config from the Options menu and adjust as follows:– Instrument: CITS100 or CITS200 as appropriate Calibration: Autocal Reference Impedance: Enter the calculated Calibration Constant CITS100/200 CALIBRATION PROCEDURE • • • • 13 CITS Service Manual... -
Page 29: Cits500 Calibration Procedure
CITS500 CALIBRATION PROCEDURE CALIBRATION PROCEDURE Equipment required Calibrated Digital Multimeter Calibrated Oscilloscope PC with current CITS Windows S/W (FSW152) Calibrated 50 Ω airline 50 Ω terminator SMA cable, 50 Ω , labelled 1 mtr (WMA258) CITS500 Status Port Tester Impedance Check Check the CITS500 line setting and connect to correct supply. -
Page 30: Adjust +12V Supply On Main Board
Adjust +12V supply on main board Set the DMM for 20V DC and connect it across C9031. This is located at the rear of the main board — see the diagram below. Adjust trimmer pot R9032 for +12.0V. R9032 +12V –12V C9035 U9030... -
Page 31: Set Up For Testing Operation With The Pc
600mV Set up for Testing Operation with the PC 1. Connect the CITS500 to the PC with an RS232 cable. 2. Plug a footpedal into the CITS500. 3. Connect the airline to the UUT front panel with the SMA cable. 4. -
Page 32: Zero Offset Adjust (Fine)
Note: In the remaining steps the instrument must stand horizontally with top and bottom panels fitted before making measurements Zero offset adjust (fine) 1. Next double click on Cal on Demand in the status bar at the bottom of the main screen. A dialogue box will appear. -
Page 33: Calculate Reference Impedance
Calculate Reference Impedance Perform 5 further tests and note the average measured value (from the statistics box on the PC screen) of each test. The difference between the highest and lowest reading should not be more than 0.2 Ω . Calculate the average of the 5 readings and use this as the average measured value to calculate the reference impedance: Reference impedance = Starting impedance + True impedance of airline –... -
Page 34: Check Reference Impedance
Check reference impedance Connect the airline and perform another 5 tests noting the average measured value of each test. The average of these values must be within ± 0.1 Ω of the airline impedance. If it is not then repeat sections Calculate Reference Impedance and Set Horizontal Offset but with the Starting impedance in the equation as the current value of the reference impedance. -
Page 35: Cits500S (16-Bit) Calibration Procedure
CITS500s (16-bit) CALIBRATION PROCEDURE CALIBRATION PROCEDURE Equipment required Calibrated Digital Multimeter Calibrated Oscilloscope 15V Power Supply Unit PC with current CITS Windows S/W (FSW159) Calibrated 50 Ω airline 50 Ω terminator SMA cable, 50 Ω , labelled 1 mtr (WMA258) CITS500 Status Port Tester Top and bottom panels. -
Page 36: Instrument Power Up Check
Use the DMM to measure the resistance between test point TP1030 on the front end board to the centre conductor of the SMA connector marked main on the front of the CITS500s. Check this is within the range 49.5 to 50.5 Ω . Instrument Power Up Check Power up the instrument and check the green "BUSY"... -
Page 37: Configure System
Configure system 1. Select Config from the Options menu, click on the System tab and adjust as follows:– • Calibration: Cal on Demand 2. Select OK and confirm your changes. 3. Select Help About. Double-click on the CITS icon at the top left of the screen. -
Page 38: Zero Offset Adjust (Fine)
In the following steps the instrument must stand horizontally with top and bottom panels fitted before making measurements Zero offset adjust (fine) 1. Next double click on Cal on Demand in the status bar at the bottom of the main screen. A dialogue box will appear. -
Page 39: Calculate Reference Impedance
Calculate Reference Impedance Perform 5 further tests and note the average measured value (from the statistics box on the PC screen) of each test. The difference between the highest and lowest reading should not be more than 0.2 Ω . Calculate the average of the 5 readings and use this as the average measured value to calculate the reference impedance: Reference impedance = Starting impedance + True impedance of airline –... -
Page 40: Check Reference Impedance
Check Reference Impedance Connect the airline and perform another 5 tests noting the average measured value of each test. The average of these values must be within ± 0.1 Ω of the airline impedance. If it is not then repeat sections Calculate Reference Impedance and Set Horizontal Offset but with the Starting impedance in the equation as the current value of the reference impedance. - Page 41 CITS500s (32-bit) CALIBRATION PROCEDURE CALIBRATION PROCEDURE Equipment required Calibrated Digital Multimeter Calibrated Oscilloscope PC with current CITS500s (32bit) Software (FSW165) Pre-Calibration Procedure Test File SMA cable (WMA258) TP1030 R1042 CITS Front End Board Re-connect JP6. Instrument Power Up Check Power up the instrument and check the green BUSY LED comes on for about a second then goes off again.
- Page 42 Check –12V supply on main board Connect the DMM across C9035 and measure the –12V supply voltage. Check that this is in the range –11.8V to – 12.2V. R9032 +12V –12V C9035 U9030 +12V C9031 Set up for Testing Operation with the PC Connect the UUT to the PC with an RS232 cable.
- Page 43 Static Damage check Set the oscilloscope as follows: CH1 100mV / DIV vertical DC coupling 50 us / DIV horizontal Connect a 1x probe to CH1 of the oscilloscope. Probe the centre conductor of the SMA connector on end of the SMA cable.
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Page 44: Impedance Measurement Calibration
IMPEDANCE MEASUREMENT CALIBRATION Equipment required PC with current CITS500s (32-bit) Software (FSW165) Two calibrated 28 Ω airlines * Two calibrated 50 Ω airlines * Two calibrated 75 Ω airlines * Two calibrated 100 Ω airline * 50 Ω termination Two new SMA cables (WMA258) * Alternative is ACC229 CITS Verification Kit NOTE: Run the CITS for at least 1 hour to stabilise ensuring that the power is NOT removed before proceeding and that... -
Page 45: Calibrating Instrument
Calibrating Instrument 1. Press ‘Set Internal Reference’. 2. For each pair of airlines: 28 Ω , 50 Ω , 75 Ω and 100 Ω • Connect the airlines to the SMA cables. • Select ‘Single Ended Ohm’. <XX> • Press Check and enter value of MAIN airline. •... -
Page 47: Dismantling Instructions
DISMANTLING INSTRUCTIONS To free the covers, first prise off the caps in the recesses in the side mouldings. Remove the screws and lift away the mouldings. Note: the CITS covers are attached to the main body of the instrument by safety ground cables. To disconnect the safety ground cables detach the push-on connector from the tab bolted to the cover. -
Page 49: Line Voltage Selection And Fuse Changing
LINE VOLTAGE SELECTION AND FUSE CHANGING WARNING: There are hazardous voltages inside the instrument when connected to its power supply. REMOVE THE POWER CORD before touching any part of the line input circuit. Note that high voltages may continue to be present for 2 minutes after power is removed until internal capacitors discharge. -
Page 50: Replacing Fuses
REPLACING FUSES Line Fuse If a line fuse failure is suspected: Disconnect the power cord. On early instruments locate the line fuse on the rear of the instrument. On later instruments remove the top cover and locate the line and neutral fuses on the Power Supply printed circuit board. -
Page 51: Maintenance And Cleaning
Do not spray cleaners directly onto the instrument. TECHNICAL SUPPORT For technical support contact your local Polar Instruments distributor or Polar Instruments Ltd. at the address at the front of this manual. INSTRUMENT REPAIR If it becomes necessary to repair the instrument, in the first instance contact the Polar Instruments distributor in your country.
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