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Summary of Contents for TTI TG550
- Page 1 TG550 5 MHz Precision Function Generator Service Manual Book Part Number 48591-0610 - Issue 1...
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Page 2: Table Of Contents
Table of Contents Specification Safety Installation General Functional Description Circuit Descriptions Calibration Parts List Component Layouts Circuit Diagram... -
Page 3: Specification
Specification Specifications apply at 18º - 28º after one hour warm-up, at maximum output into 50Ω. FREQUENCY Frequency Range: 0·005Hz to 5MHz in 7 overlapping decade ranges with adjustment by coarse and fine verniers. Vernier Range: 1000:1 on each range. Frequency Display: Auto-ranging reciprocal measurement giving 4-digit resolution down to 10Hz (to 1Hz on the 5Hz range);... -
Page 4: Amplitude Modulation
Amplitude Modulation Modulation Depth: Variable 0 to 100% typical. Modulation Frequency: 400Hz internal. DC to 100kHz external. External Modulation: By signal applied to COUNT/AM IN socket. OUTPUTS 50Ω Main Out Output Impedance: 50Ω. Amplitude: 2mV to 20V peak-peak open circuit (1mV to 10V peak-peak into 50Ω) in four switch-selectable ranges with 20dB vernier control within each range. - Page 5 Count In The AM/COUNT IN socket is set to external frequency measurement when EXT COUNT is selected. Input Impedance: 1MΩ//25pF. Input Sensitivity: 50mVrms (sinewave). 50Vdc/50Vrms to 400Hz with respect to ground , reducing to Maximum Allowable Input Voltage: 1Vrms above 1MHz. DISPLAY FUNCTIONS The LCD shows generator frequency simultaneously with output amplitude/offset, together with various status annunciators.
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Page 6: Safety
Safety This instrument is Safety Class I according to IEC classification and has been designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended for operation from a normal single phase supply. -
Page 7: Emc
This generator has been designed to meet the requirements of the EMC Directive 89/336/EEC. Compliance was demonstrated by meeting the test limits of the following standards: Emissions EN50081-1 (1992) Generic emission standard for residential commercial and light industry. Test methods and limits used were: a) EN55022 Conducted, Class B b) EN55022 Radiated, Class B Immunity... -
Page 8: Installation
Installation Mains Operating Voltage The operating voltage of the instrument is shown on the rear panel. Should it be necessary to change the operating voltage from 230V to 115V or vice-versa, proceed as follows: Disconnect the instrument from all voltage sources. Remove the 4 screws which hold the upper and lower case halves together and lift off the case lower. -
Page 9: General
General Service Handling Precautions Service work or calibration should only be carried out by skilled engineers. Please note the following points before commencing work. The tracks on the printed circuit board are very find and may lift if subjected to excessive heat. Use only a miniature temperature controlled soldering iron and remove all solder (on both sides of the joint) with solder wick or suction before attempting to remove a components. - Page 10 Functional Block Diagram...
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Page 11: Functional Description
Functional Description The relationships between the major circuit elements are shown in the block diagram. The summing amplifier sums the voltages from the dial, the frequency lock DAC, sweep input and the internal sweep circuit and its output controls the magnitude of the complimentary current source and current sink. -
Page 12: Circuit Descriptions
Circuit Descriptions Power Supply - DC Regulation Diode bridge BR2 rectifies the full output of the transformer; C56 and C57 are the reservoir capacitors which supply the ± 15V regulators. Fine adjustment is provide by VR23 and VR24. The ± 12V rails are derived from the ± 15V rails with D31 and D32. The +6V rail is derived from the +15V rail with D33. -
Page 13: Digital Display
Output Amplifier Q21 and Q22 are complementary emitter followers and buffer the output of IC19. The DC Offset control is buffered by IC23A and IC23C and applied via R120 and R175. Amplitude Modulator When the AM button is depressed, the amplitude modulator is inserted between the preamplifier and the output amplifier. -
Page 14: Calibration
Calibration Equipment Required Oscilloscope Distortion Meter 4·5 digit Multimeter Reciprocal counting Frequency Meter Only the case lower need be removed to gain access to all adjustments. Allow 1 hour warm-up (with the case lower in place) before commencing. For best results, use the following procedure. Power Supply +15V ±... - Page 15 Sinewave Distortion Select sinewave, 5k range, 3kHz. Adjust VR10 and VR11 for minimum distortion. Adjust VR9 for the output to be symmetrical about 0V. 500k range, approximately 300kHz, sinewave, modulation to minimum, amplitude to maximum (20V pk-pk). Select AM, check output drops to half (10V pk-pk) adjusted by VR18. Modulation to maximum, adjust VR17 for 100% modulation.
- Page 16 Main Board – Calibration Points...
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Page 17: Parts List
Parts List PCB ASSY MAIN (44912-0450) Part No. Description Position 20205-0610 STUD M3 X 10 KFH-M3-10ET FOR PJ2 20613-0007 WASHER (SIL-PAD) TO220 PLAIN FOR IC25,26 20661-0801 SPACER TRANSISTOR MTG TO5 FOR Q21,22 20670-0040 HEATSINK TO5 48DEG C/W FOR Q21,22 20670-0135 CLIP GP02 FOR PCB MTG H/SINKS FOR IC25,26 20670-0320... - Page 18 PCB ASSY MAIN (44912-0450) continued/… Part No. Description Position 23202-1340 RES 340RF W25 MF 50PPM R106 23202-1402 RES 402RF W25 MF 50PPM R229 23202-1470 RES 470RF W25 MF 50PPM 23202-1510 RES 510RF W25 MF 50PPM R155,156 23202-1620 RES 620RF W25 MF 50PPM R24,25,75,76 23202-1680 RES 680RF W25 MF 50PPM...
- Page 19 Part No. Description Position 23202-3130 RES 13K0F W25 MF 50PPM R145,223 23202-3150 RES 15K0F W25 MF 50PPM R57,105,109,113 23202-3220 RES 22K0F W25 MF 50PPM R97,165,184,235 23202-3226 RES 22K6F W25 MF 50PPM R104 23202-3249 RES 24K9F W25 MF 50PPM R111 23202-3270 RES 27K0F W25 MF 50PPM 23202-3300 RES 30K0F W25 MF 50PPM...
- Page 20 Part No. Description Position 23424-0443 CAP 10NZ 1KV CER D10 P5 C55,130 23424-0459 CAP 4N7 250V AC CER STR/LNG Y C124,125 23427-0268 CAP 22PJ 100V CER NPO P2.5 C17,32,112,113,121 23427-0331 CAP 1N0K 63V CER HI K P5T C135 23427-0385 CAP 39PJ 100V CER NPO P2.5 C109 23427-0593 CAP 82PG 100V CER NPO P2.5...
- Page 21 Part No. Description Position 25377-0700 TRAN NPN 2N2219A 25377-5490 TRAN NPN BC549C Q3,5,13-16,18,19,26 25381-0404 TRAN NPN 2N3904T 25601-0103 TRAN FET BF245AT Q7,8 25601-0400 TRAN MOSFET N CHAN ZVN3306A 27106-0505 IC CA3080E 27106-0506 IC LM324N1 IC2,3,10,41 27106-0513 IC LM358N IC36 27106-0518 IC MC3403P IC23 27106-0548...
- Page 22 Part No. Description Position 23202-1150 RES 150RF W25 MF 50PPM R200 23202-2100 RES 1K00F W25 MF 50PPM R211,217,218,222 23202-2220 RES 2K20F W25 MF 50PPM R203 23202-2470 RES 4K7OF W25 MF 50PPM R216 23202-3100 RES 10K0F W25 MF 50PPM R204,205,206,240,241 23202-3300 RES 30K0F W25 MF 50PPM R212,221 23202-4100...
- Page 23 Part No. Description Position 20038-9502 WASHER M4 SPRING REAR PANEL EARTH 20038-9501 WASHER M3 SPRING MAIN PCB/CASE UPPER, CONTROL PCB/FRONT PANEL, FRONT PANEL EARTH 20037-0401 SOLDER TAG SHAKEPROOF - 4BA REAR PANEL EARTH 20037-0400 SOLDER TAG SHAKEPROOF - 6BA FRONT PANEL EARTH 20030-0266 WASHER M4 ZPST REAR PANEL EARTH...
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Page 24: Component Layouts
Component Layouts... -
Page 25: Circuit Diagram
Circuit Diagram... - Page 27 Thurlby Thandar Instruments Ltd Glebe Road, Huntingdon, Cambridgeshire PE29 7DR, England Telephone: (44) 01480 412451 Fax: (44) 01480 450409 e mail: sales@tti-test.com web site: www.tti-test.com...