Related Manuals for Polar Instruments T1500A
Summary of Contents for Polar Instruments T1500A
- Page 1 Polar Instruments Ltd. T1500A Garenne Park St. Sampson SERVICE Guernsey Channel Islands MANUAL GY2 4AF ENGLAND Fax: +44 (0)1481 52476 MAN159–9604...
- Page 3 INSTRUMENTS LTD and not having been altered in any way or subject to misuse, negligence or damage, and not having been repaired or attempted to be repaired by any other than POLAR INSTRUMENTS LTD or its authorized distributors. EXCEPT FOR THE FOREGOING EXPRESS WARRANTY OF...
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Page 4: Declarations
This product is in conformity with the protection requirements of EC Council Directive 89/336/EEC on the approximation of the laws of the Member States relating to electromagnetic compatibility. A declaration of conformity with the requirements of the Directive has been signed by POLAR INSTRUMENTS (UK) LTD 11 College Place London Road Southampton... -
Page 5: Safety
T1500A SERVICE MANUAL 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 6: Operation
The unit is designed for use indoors in an electrical workshop environment at a stable work station comprising a bench or similar work surface. 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 7: Specifications
T1500A SERVICE MANUAL SPECIFICATIONS Open Circuit Voltage Short Circuit Current ASA Test Ranges Junction 500µA Logic 150mA High Hi-Cap (1Hz fixed) 150mA Low-Cap (2kHz fixed) 20µA ASA Test Frequencies 95Hz Medium 500Hz High 2kHz Internal CRT Display ENVIRONMENTAL OPERATING CONDITIONS... -
Page 8: Physical Characteristics (Excluding Accessories)
1.5 kg (3.3 lb.) SYMBOLS REFER TO MANUAL These sockets are for connecting only Polar Instruments probes and connectors for use as described in the Operator Manual. To prevent damage to this product and to ensure its safe use observe the specifications given in this manual when connecting to terminals marked with this symbol. -
Page 9: Table Of Contents
SECTION 2 – CALIBRATION..................2-1 CALIBRATION PROCEDURE .................. 2-1 Equipment required ....................2-1 Calibration procedure .................... 2-1 SECTION 3 – CIRCUIT DESCRIPTION ..............3-1 T1500A CIRCUIT DESCRIPTION ................3-1 Sine generator ....................... 3-1 Sine drivers......................3-1 Switching ....................... 3-2 Amplifier ........................ 3-3... - Page 10 Low voltage supplies ..................3-4 X and Y-plate drivers ..................... 3-4 SECTION 4 – DISMANTLING INSTRUCTIONS ............4-1 DISMANTLING THE T1500A ................... 4-1 SECTION 5 – LINE VOLTAGE AND FUSE CHANGING ..........5-1 LINE VOLTAGE SELECTION AND FUSE CHANGING ........... 5-1 Changing the line voltage ..................
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Page 11: Section 1 - Performance Check
SECTION 1 – PERFORMANCE CHECK MAINTENANCE AND CALIBRATION OF INSTRUMENTS For most of Polar Instruments’ products there are two maintenance procedures — the Performance Check and the Adjustment Procedure. 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 12: Performance Check
T1500A SERVICE MANUAL PERFORMANCE CHECK Procedure 1. Connect the T1500A to a suitable source of power, turn on and allow to warm up for 20 minutes. 2. Short A to COM and adjust the position controls to confirm their operation. Set the trace for a “+” display. Check that the ends of the traces can be seen —... -
Page 13: Section 2 - Calibration
SECTION 2 – CALIBRATION CALIBRATION PROCEDURE WARNING: Hazardous voltages are exposed on the PCB when the cover is removed with power applied and for up to five minutes after power is removed. This procedure should only be performed by a technically qualified person aware of the hazards and taking all reasonable care. - Page 14 T1500A OPERATOR MANUAL 7. Adjust R27 to set the trace length of the horizontal trace so that both ends are just visible. 8. Adjust R32 to align the trace with the horizontal graticule line. 9. Adjust the front panel Trace Rotation control to rotate the trace if necessary to align with the horizontal graticule line.
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Page 15: Section 3 - Circuit Description
T1500A CIRCUIT DESCRIPTION Sine generator Refer to the T1500A Sine Generator schematic Oscillator U10B runs at 2MHz and is controlled by crystal X1. This forms the master clock which sets the frequency of all outputs and system timing. Binary counter U11 reduces the clock to the four source frequencies for the sine wave generator, 1MHz, 250kHz, 62.5kHz, and 488Hz. -
Page 16: Switching
FREQUENCY LEDs. The voltages at the outputs are sensed by the Input Amplifiers (refer to T1500A Amplifier schematic) whose R resistors are selected by the switches. Note that there... -
Page 17: Amplifier
C55 but protection is provided by D69 for start up and switch off transients. Power supplies Refer to the T1500A Power Supplies schematic High voltage supply All supply voltages are obtained from the mains transformer. Diode capacitor arrangements supply the regulators for the low voltage and +180V supply but the high voltage is generated by a multiplier from the 150 volt winding producing about –1500V,... -
Page 18: Low Voltage Supplies
R51 and R30 set the current into the LED of opto-coupler ISO1 (refer to T1500A CRT schematic) to set the intensity while U7A and B produce pulses at the edges of the... -
Page 19: Section 4 - Dismantling Instructions
SECTION 4 – DISMANTLING INSTRUCTIONS DISMANTLING THE T1500A • Ensure the power cord is removed and the unit has been turned off for at least five minutes. • Remove the CRT base and then the four screws holding the shield to the front panel. -
Page 20: Section 5 - Line Voltage And Fuse Changing
SECTION 5 – LINE VOLTAGE 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 5 minutes after power is removed until internal capacitors discharge. -
Page 21: Section 6 - Fault Diagnosis
SECTION 6 – FAULT DIAGNOSIS WARNING: Hazardous voltages are exposed on the PCB when the cover is removed. These procedures should only be performed by a technically qualified person aware of the hazards and taking all reasonable care. TROUBLESHOOTING HINTS •... -
Page 22: Section 7 - Maintenance And Cleaning
If it becomes necessary to repair the instrument, in the first instance contact the Polar Instruments distributor in your country. In case of difficulty contact Polar Instruments Ltd. at the address at the front of this manual. Do not send the... -
Page 23: Section 8 - Replacement Parts
Note: Parts marked with an asterisk (*) have been subject to modification in later instruments. Safety critical parts (listed in bold type) must be replaced with parts obtained from Polar Instruments Ltd. or your Polar Instruments distributor to ensure continued safe operation. -
Page 24: Crt Board Parts
T1500A SERVICE MANUAL CRT BOARD PARTS PART Nº Quantity Description Circuit Reference CVD139 470pF 2KV CERAMIC DZA306 91V ZENER DIODE D14, D69 ICA247 OPTO-ISOLATOR ISO1 MPC177 PCB to D692-6 MQX181 CRT BASE RCC110 1000V 4M7 R104 RCF000 LINK RCF100K RESISTOR 100K 1/4W... - Page 25 REPLACEMENT PARTS PART Nº Quantity Description Circuit Reference DSP101 1N4148 D2, D3, D7, D8, D9, D40, D41, D42, D43 DSP102 1N4007 D1, D4, D5, D6, D10, D11, D12, D13, D14, D15, D16, D17, D20, D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D51, D52, D53, D54, D55, D56 DSP104...
- Page 26 T1500A SERVICE MANUAL PART Nº Quantity Description Circuit Reference MNS117 M3 x 10 Pan Head Screw MNS125 M3 Lockwasher MNS174 M3 Washer MPCD1028 Main PCB MPCD1029 Panel PCB MPCD1030 Pots PCB MPP143 Heatsink Insulators MPP158 Spindle MPP200 LED Spacers MQX299...
- Page 27 REPLACEMENT PARTS PART Nº Quantity Description Circuit Reference RCF470R Resistor 1/4W R202, R203 RCF47K Resistor 1/4W R97, R100 RCF4K7 Resistor 1/4W R8, R11, R41 RCF7K5 Resistor 1/4W R9, R10, R25, R26 RCF820R Resistor 1/4W R92, R93, R103, R104 RCT100K Resistor 1/4W R80, R81 RCT10K...
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Page 28: Mechanical Parts
T1500A SERVICE MANUAL MECHANICAL PARTS PART Nº Quantity Description LDD102 MCA138 Case Top MCA139 Case Bottom MCA162 Front Moulding MKB127 Knob Cap MKB128 Knob MKB129 Button caps MKB153 Power Switch Button MMP121 Safety Label MMP166 CRT Shield MNS107 K30 x 6 Self Tap... -
Page 29: Section 9 - Schematic Diagrams
SECTION 9 – SCHEMATIC DIAGRAMS...
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