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TG501

Function Generator

Service Manual

Book Part Number 48591-0130 - Issue 5

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Summary of Contents for TG501

Page 1: ...TG501 Function Generator Service Manual Book Part Number 48591 0130 Issue 5...

Page 2: ...adjustment replacement or maintenance and repair during which it shall be opened If afterwards any adjustment maintenance or repair of the opened instrument under voltage is inevitable it shall be ca...

Page 3: ...l Times 45ns Mark Space Ratio 1 1 1 to 100kHz 5 to 5MHz DC Range 10V from 50 Ohm OPERATING MODES Run Generator runs continuously at the selected frequency Triggered Generator is quiescent until trigge...

Page 4: ...m 50Ohm 10V into 50Ohm Attenuator Additional switch selectable attenu ation of 0 20 or 40dB Minimum output 20mV peak to peak from 50Ohm 10mV into 50Ohm DC Offset Control Range 10V from 50Ohm DC offset...

Page 5: ...positive going triangle slope When the comparator output is low the charge on the capacitor will fall linearly producing the negative going triangle slope The triangle amplifier has unity gain and buf...

Page 6: ...acitor multiplier circuit The TTL circuit buffers one of the comparator outputs to drive the TTL output socket The squarewave shaper converts the comparator output to a current signal and applies it t...

Page 7: ...wing the appropriate diagram below If a change is made the operating voltage label and fuse should also be changed For 220 240V operation use 200mA 250V time lag For 110 120V operation use 400mA 250V...

Page 8: ...ndard 3 terminal regulator IC22 The 5V rail is divided down from the 15V by R139 R140 and buffered by a darlington emitter follower Q32 and Q33 Waveform Generation Summing Amplifier and Current Source...

Page 9: ...to give a low impedance voltage source on pin 9 of IC10 This voltage can be varied between approximately 1 2V by VR11 corresponding to the triangle peaks giving 90o of phase control To release the cla...

Page 10: ...provides a small amount of positive feedback to ensure jitter free operation Some comparators oscillate with the dial at 0 005 this can be prevented by fitting C66 One of the comparator outputs is ro...

Page 11: ...et the flip flop IC14b which releases the waveform clamp The flip flop now waits for a rising edge on its clock input this occurs when the triangle wave changes from a negative slope to a positive slo...

Page 12: ...es a long tailed pair driven almost into cut off and converts the clipped triangle wave into a sinewave VR19 adjusts the gain of the long tailed pair to bring them close to cut off and therefore minim...

Page 13: ...description of the HF amplifier simplified Q24 and Q26 are complementary emitter followers to provide low drive impedance to the complementary class A amplifier stage Q28 and Q29 Level shifting is ach...

Page 14: ...bration points are Dial calibration high frequency 5 0 end 10k range VR3 Dial calibration low frequency end 005 VR2 Waveform symmetry high frequency end of dial 5 0 VR9 Waveform symmetry at the low fr...

Page 15: ...correct operation of the instrument Gold plated test pins are provided and a gold plated 2 way header on the end of the leads to the DVM is recommended to make a good connection and help to avoid ther...

Page 16: ...e switch Before commencing the vernier calibration procedure turn the dial fully clockwise and check that the 005 mark aligns with the mark on the front panel If not remove the cap in the centre of th...

Page 17: ...are top soldered The circles teardrops show track pins and the squares show which lead of a component is top soldered Insulating washers are fitted to IC22 Q32 Q34 and Q39 Heatsink compound is applie...

Page 18: ...R13 4K3J W25 CF 23187 2430 R14 4K3J W25 CF 23187 2430 R15 750RF W25 MF 23202 1750 R16 3K3J W25 CF 23185 2330 R17 47RJ W25 CF 23185 0470 R18 47RJ W25 CF 23185 0470 R19 2K7F W25 MF 23202 2270 R20 2K7F W...

Page 19: ...5 MF 23202 3143 R48 220RF W25 CF 23185 1220 R49 681RF W25 MF 23202 1681 R50 124RF W25 MF 23202 1124 R51 124RF W25 MF 23202 1124 R52 681RF W25 MF 23202 1681 R53 220RF W25 MF 23202 1220 R54 14K3F W25 MF...

Page 20: ...F 23187 2750 R83 7K5J W25 CF 23187 2750 R84 68RJ W25 CF 23185 0680 R85 7K5J W25 CF 23187 2750 R86 100RJ W25 CF 23185 1100 R87 47RJ W25 CF 23185 0470 R88 10KJ W25 CF 23185 3100 R89 5K6F W25 MF 23202 25...

Page 21: ...19 10RJ W25 CF 23185 0100 R120 47RJ W25 CF 23185 0470 R121 47RJ W25 CF 23185 0470 R122 3K3J W25 CF 23185 2330 R123 10RJ W25 CF 23185 0100 R124 10RJ W25 CF 23185 0100 R125 10RJ W25 CF 23185 0100 R126 1...

Page 22: ...5 2470 R154 10KF W25 MF 23202 3100 R155 10KF W25 MF 23202 3100 R156 22KJ W25 CF 23185 3220 R157 8K2J W25 CF 23185 2820 R158 3K9J W25 CF 23185 2390 R159 1K8J W25 CF 23185 2180 R160 2K2J W25 CF 23185 22...

Page 23: ...77 2100 VR16 Preset 10K 23377 3100 VR17 Preset 470R 23377 1470 VR18 Preset 4K7 23377 2470 VR19 Preset 100R 23377 1100 VR20 Preset 2K2 23377 2220 VR21 Preset 100R 23377 1100 VR22 Preset 4K7 23377 2470...

Page 24: ...3427 0325 C15 10NZ 63V Cer 23427 0325 C16 47PG 63V Cer 23427 0329 C17 18PG 63V Cer 23427 0337 C18 22PG 63V Cer 23427 0323 C19 82PG 63V Cer 23427 0349 C20 82PG 63V Cer 23427 0349 C21 3N3F 160V P S 2364...

Page 25: ...3V Cer 23438 0007 C50 1000UF 63V Elec 23557 0244 C51 1000UF 63V Elec 23557 0244 C52 100NS 63V Cer 23438 0007 C53 100PG 63V Cer 23427 0322 C54 100PG 63V Cer 23427 0322 C55 100UF 25V Elec 23557 0650 C56...

Page 26: ...0901 D13 Dio 1N4148 25021 0901 D14 Dio BZX79C11 25130 0910 D15 Dio BZX79C11 25130 0910 D16 Dio 1N4148 25021 0901 D17 Dio 1N4148 25021 0901 D18 Dio 1N4148 25021 0901 D19 Dio BZX83C11 25130 0908 D20 Dio...

Page 27: ...25341 0214 Q15 Tran 2N3904 25381 0404 Q16 Tran ZTX239 25380 0229 Q17 Tran 2N3904 25381 0404 Q18 Tran 2N3904 25381 0404 Q19 Tran ZTX313 25380 0230 Q20 Tran 2N3904 25381 0404 Q21 Tran 2N3904 25381 0404...

Page 28: ...6 0621 IC3 LF441CN 27106 0621 IC4 LF441CN 27106 0621 IC5 LF441CN 27106 0621 IC6 LF441CN 27106 0621 IC7 TL071CP 27106 0604 IC8 TL071CP 27106 0604 IC9 TL071CP 27106 0604 IC10 CA3019 27164 0600 IC11 TL07...

Page 29: ...12 off 22573 0041 Zero ohm resistors LK1 to LK69 inc J1 J2 J3 J4 73 off 23185 0000 Socket IC 8 pin 13 off 22574 0118 Socket IC 14 pin 6 off 22574 0119 Socket IC 16 pin 22574 0120 Bracket potentiomete...

Page 30: ...f 22588 0700 LED 25061 0200 Adhesive pad for LED 10300 0313 Sleeve for LED wire 10232 0303 Solder tag shakeproof for earth wire 20037 0400 Rear Panel Assy TG501 Description Part No Rear Panel 33331 08...

Page 31: ...pper 33537 0240 Case Lower 33537 0250 Bracket side 2 off 31547 0140 Screw M3 x 8mmL mushroom head case upper lower to side brackets 8 off 20237 0001 Screw M3 x 5mmL Taptite PCB securing 4 off 20062 05...

Page 32: ...and rear The front panel earth wire connection by the shakeproof solder tag was no longer required A new carton was also introduced to accomodate the new case The old and new parts which are not inter...

Page 33: ......

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