Thurlby Thandar Instruments TG120 User Manual [en, de, fr, it]

TG120

20MHz Function Generator

INSTRUCTION MANUAL

Table of Contents

Introduction 1 Specification 2 EMC 4 Safety 5 Installation 6 Operation 7 Maintenance 8 Instructions en Francais 9 Bedienungsanleitung auf Deutsch 13 Istruzioni in Italiano 17 Instrucciones en Español 21

Introduction

This instrument is a 20MHz function generator with waveforms of sine, square, triangle, r am p, pulse and DC from a variable amplitude 50Ω output. A TTL output is also provided.

The frequency range is 0. 2Hz to 20MHz selected by an eight decade range m ult iplier and calibrat ed vernier. The sweep input can be used to give a >20:1 freq uenc y change within a selected r ange.

The generator output level is 20Vpk-pk maximum from a 50Ω sourc e. The level is set via switched attenuators plus vernier with a total range of 66dB. DC off s et is vernier adj us table over a ±10V range with 0V defined by a centre detent.

A switchable symmetry control with a 6:1 range permits ram p and pulse waveform s t o be pr oduc ed.

Frequency Range:

0.2Hz to 20MHz in 8 overlapping decade ranges with fine adjustment by a vernier.

Vernier Range:

>10:1 on each range.

Vernier Accuracy:

Typically ± 5% of full scale.

Sweep Range:

Typically >20:1.

Input Impedance:

82 kΩ

Input Sensitivity:

Typically 0 to 2V for 10:1 sweep.

Maximum Allowable Input Voltage:

±10V

Maximum Slew Rate of Sweep Voltage:

0.1V/us

Distortion:

Typically 2% on 200, 2k and 20k ranges .

Amplitude Flatness:

± 0.2dB to 200kHz; ± 2dB to 20MHz.

Linearity:

Typically 99% on kHz ranges.

Rise and Fall Times:

<22ns

Range:

±10V from 50Ω

Symmetry Range:

Typically variable from 1:6 to 6:1 up to 500kHz.

0dB Range:

1V to 20V peak-to peak fr om 50 Ω (0·5V to 10V into 50Ω).

–20dB Range:

100mV to 2V peak-to-peak (50mV to 1V int o 50Ω)

–40dB Range:

10mV to 0.2V peak-to-peak (5mV t o 0. 1V into 50Ω)

DC Offset Cont rol DC offset plus waveform attenuated proport ionally in –20dB and –40dB position.

Power:

220V-240V AC or 110-120V AC ±10%, 50/ 60Hz; 30VA m ax. I nstallation Category II.

Operating Range:

+5ºC to + 40ºC, 20% to 80% RH.

Storage Range:

–40ºC to +70ºC

Environmental:

Indoor use at altitudes up to 2000m, Pollution Degree 2.

Electrical Safety:

Complies with EN61010-1.

EMC:

Complies with EN61326.

Size:

220(W) x 82(H) x 230(D) m m, (10.3 x 3.4 x 9.2”) excluding feet.

Weight:

1.5 Kg (3.3lb).

Specification

FREQUENCY

SWEEP MODE (EXTERNAL)

OPERATING MODES

(Specifications apply for the top decade of each frequenc y rang e and output 10V peak-to-peak into 50Ω termination).

SINE

TRIANGLE

SQUAREWAVE

SYMMETRY

OUTPUTS (50Ω)

Three switch-selectable ranges with 26dB vernier control within each attenuator range.

±10V from 50Ω. DC off s et plus signal peak limited to ±10V (± 5V into 50Ω).

Range:

TTL

Capable of driving 4 standard TTL loads.

GENERAL

Performance levels achieved are detailed in the user manual.

EC Declaration of Conformity

We Thurlby Thandar Instruments Ltd Glebe Road Huntingdon Cambridgeshire PE29 7DR England

declare that the

TG120 20MHz Function Generator

meets the intent of the EMC Directive 2004/108/EC and the Low Voltage Directive 2006/95/EC. Compliance was demonstrated by conformance to t he following specifications which have been listed in the Official Journal of the European Comm unit ies.

EMC

Emissions: a) EN61326-1 (2006) Radiated, Class B

b) EN61326-1 (2006) Conducted, Class B c) EN61326-1 (2006) Har m onics, referring to EN61000-3-2 (2006)

Immunity: EN61326-1 (2006) Immunity Table 1, referring to:

a) EN61000-4-2 (2009) Electrostatic Discharge b) EN61000-4-3 (2006) Electromagnetic Field c) EN61000-4-11 (2004) Voltage Interrupt d) EN61000-4-4 (2004) Fast Transient e) EN61000-4-5 (2006) Surge f) EN61000-4-6 (2009) Conducted RF

Safety EN61010-1 Installation Category II, Pollution Degree 2.

CHRIS W ILDING TECHNICAL DIRECTOR

2 January 2013

This instrument has been designed to meet the requirements of the EMC Directive 2004/108/EC. Compliance was demonstrated by meeting the test limits of t he following standards:

Emissions

EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use. Test limits used were:

a) Radiated: Class B b) Conducted: Class B c) Harm onics: EN61000-3-2 (2006) Class A; the instrument is Class A by product category.

Immunity

EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use.

Test met hods, limits and performance achieved are shown below (requirement shown in brackets):

a) EN61000-4-2 (2009) Electrostatic Discharge : 4k V air, 4kV contact, Perfor m ance A (B).

EMC

b) EN61000-4-3 (2006) Electromagnetic Field:

c) EN61000-4-11 (2004) Voltage Interrupt: ½ c ycle and 1 cycle, 0%: Performance A (B);

d) EN61000-4-4 (2004) Fast Transient, 1kV peak (AC line), 0·5kV peak ( DC Out puts) , Performance B (B).

e) EN61000-4-5 (2006) Surge, 0·5kV (line t o line), 1kV (line to ground), Perform anc e A (B). f) EN61000-4-6 (2009) Conducted RF, 3V, 80% AM at 1kHz (AC line only; DC Output

connections <3m, therefor e not tested), Performance A (A). According to EN61326-1 the definitions of performance criteria are:

Performance criterion A: ‘During test normal performance within the specification limits.’ Performance criterion B: ‘During t est , temporary degradation, or loss of function or

performance which is self-recovering’. Performance criterion C: ‘During t est, temporary degradation, or loss of function or

performance which requires operator int er vention or s ystem r eset occurs.’

Cautions

To ensure continued com pliance with the EMC directive the following precautions should be observed:

3V/m, 80% AM at 1kHz, 80MHz – 1GHz: Performance A (A) and 1.4GHz to 2GHz: Performance A (A); 1V/m, 2.0GHz to 2.7GHz: Performance A (A).

25 cycles, 70% and 250 cycles, 0%: Performance B ( C) .

a) connect t he generator to other equipment using only high quality, double-screened cables. b) after opening the case for any reason ensure that all signal and g r ound connections are

remade correctly before replacing the covers. Always ensure all case screws are correctly refitted and tightened.

c) In the event of part replacement becoming neces sar y, only use components of an identical

type, see the Service Manual.

Safety

This instrument is Safety Class I accor ding 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 Ins tallation Categ ory II instrument intended for operat ion from a normal single phase supply.

This instrument has been tested in accordanc e with EN61010-1 and has been supplied in a safe condition. This instruction manual contains some information and warnings which have to be followed by the user to ensure safe operation and to r etain the inst r um ent in a safe condition.

This instrument has been designed f or indoor use in a Pollution Degree 2 environment in the temperature range 5°C t o 40°C, 20% - 80% RH (non-condensing). It may occasionally be subjected to temperatures between +5°C and –10°C without degradation of its safety. Do not operate while condensation is present.

Use of this instrument in a manner not spec ified by these instructions may impair the safety protection provided. Do not operate the instrum ent outside its rat ed supply voltages or environmental range.

WARNING! THIS INSTRUMENT MUST BE EARTHED

Any interruption of the mains earth conduct or inside or outside the instrument will make the instrument dangerous. Int entional interruption is prohibited. The protective action must not be negated by the use of an extension cord without a protective conductor.

When the instrument is connected to its supply, terminals may be live and opening the covers or removal of parts (except those to which access can be gained by hand) is likely to expose live parts. The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment, replacement, m aint enanc e or r epair.

Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided as far as possible and, if inevitable, shall be carried out only by a skilled person who is aware of the hazard involved.

If the instrument is clearly defective, has been subject to mechanical damage, excessive moisture or chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn from use and returned for checking and repair.

Make sure that only fuses with the required rat ed c ur r ent and of the specified type are used for replacement. The use of makeshift fuses and the short-circuiting of fuse holders is prohibited.

Do not wet the instrument when cleaning it. The following symbols are used on the instrument and in this m anual:-

Caution - refer to the accompanying documentation, incorrect operation may damage the instrument.

terminal connected to chassis ground. mains supply OFF.

mains supply ON. alternating current.

MAINS OPERATING VOLTAGE

The operating voltage of the instr um ent is shown on the rear panel. Should it be necessary to change the operating voltage from 230V t o 115V or vice-versa, proceed as follows:

1. Disconnect t he inst rument from all voltage sources.

2. Remove t he 4 sc r ews which hold the upper and lower case halves together and lift off the case upper.

3. Chang e t he transformer connections f ollowing the diag r am s below.

230V Operating - Primaries in series

Installation

115V Operation - Primaries in parallel

4. Reassemble in the reverse order.

5. To comply with safety standard requirem ents t he operating voltage marked on the rear panel must be changed to clearly show the new voltage setting.

MAINS LEAD

When a three c or e m ains lead with bare ends is provided it should be connected as follows:-

Brown - Mains live Blue - Mains neutral

Green/Yellow - Earth

WARNING! THIS INSTRUMENT MUST BE EARTHED

Any interruption of the mains earth conduct or inside or outside t he inst r um ent will make the instrument dangerous. Int entional interruption is prohibited.

POWER

The ON/OFF switch is on the rear panel of the instr um ent.

FREQUENCY SELECTION

Frequency range is selected by an eight position multiplier switch with fine adjustment by calibrated vernier.

SYMMETRY

A slide switch selects the symmetry control which varies the duty cycle 1:6 to 6:1 to produce sawtooth and variable pulse-width waveforms.

Note: The symmetry of the Aux Output does not vary when Sine or Triangle are selected because the Aux Output is generated by a zero crossing comparator.

FUNCTION SELECTION

The output waveform shape is selected by a four position switch to give sine, square, triangle and DC. A DC level only is useful as it permits input threshold testing of a circuit without having to connect up an external supply.

Operation

MAIN OUTPUT

The amplitude of the 50 Ω MAIN output is controlled by the 3-position ATTENUA TOR switches and AMPLITUDE control. Maximum output is 20 volts peak-to-peak from 50 Ω and 10 volts peakto-peak when terminated with a 50 Ω load.

The AMPLITUDE control has greater than 26dB range and used in conjunction with the ATTENTUATORS a range of 0dB to -66dB can be achieved. This provides a range of 20V peakto-peak down to 10mV peak-to-peak, or 10V peak -to-peak down to 5mV peak-to-peak into 50 Ω.

Greater attenuation can be achieved by using standard 50 Ω BNC attenuators. To maintain waveform integrity only 50 Ω cable should be used and the receiving end should be terminat ed with a 50 Ω load. The 50 Ω MAIN output will withstand a short circuit for a period of 2 minutes at maximum output and greater periods at lower output levels.

Do not apply external voltages to this output.

DC OFFSET

The DC OFFSET control has a range of ± 10 volts fr om 50 Ω in all output modes; the control has a centre detent for 0 volts. DC offset plus s ig nal peak is limited to ± 10V (± 5V into 50 Ω). DC offset plus waveform is attenuated proportionally in the -20dB and -40dB positions.

AUX OUTPUT

The AUX output provides a fixed TTL pulse output at the same frequency and phase as the 50 Ω MAIN output and is capable of driving 4 standard TTL loads.

SWEEP INPUT

The generator fr equency can be swept, DC programmed or modulated by a suitable control voltage applied to the SWEEP IN socket. The instrum ent s um s the SWEEP IN voltage with the internal control voltage derived from the FREQUENCY vernier to determine the operating frequency. A positive voltage increases the frequency; for f r equency control with positive-going DC inputs the vernier should therefore be set to the lower fr equency limit of the range to be swept. For example, a 0V to +2V signal will sweep the generator 1 decade up from r ange minimum, set by the vernier, to range maximum.

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