Related Manuals for TTI tg2000
Summary of Contents for TTI tg2000
-
Page 1: Instruction Manual
THURLBY THANDAR INSTRUMENTS TG2000 20MHz DDS FUNCTION GENERATOR INSTRUCTION MANUAL... -
Page 2: Table Of Contents
Table of Contents Introduction Specifications Safety Installation Connections Front Panel Connections Rear Panel Connections General Initial Operation Standard Waveform Operation Setting Generator Parameters AUX Output Warnings and Error Messages Sweep Operation General Setting Sweep Parameters Gated Mode Tone Mode Modulation System Operations from the Utility Menu Calibration Equipment Required... -
Page 3: Introduction
Introduction This Programmable Function Generator uses direct digital synthesis to provide high performance and extensive facilities at a breakthrough price. It can generate a variety of waveforms between 1mHz and 20MHz with a resolution of 6 digits and an accuracy better than 10ppm. Direct digital synthesis for accuracy &... -
Page 4: Specifications
Specifications Specifications apply at 18°- 28°C after one hour warm-up, at maximum output into 50Ω. WAVEFORMS Standard waveforms of sine, square, triangle, DC, positive pulse and negative pulse. Sine Range: 1mHz to 20MHz Resolution: 1mHz or 6 digits Accuracy: 10 ppm for 1 year; ± 1mHz below 0.2Hz Temperature Stability: Typically <1 ppm/ºC outside 18°... - Page 5 Gated Non-phase coherent gating - output carrier wave is on while Gate signal is high and off while low. Carrier frequency: From 1mHz to 20MHz. Carrier waveforms: Trigger rep. rate: DC to 100 kHz external; to 5kHz using internal trigger generator. Gate signal source: Manual (front panel MAN TRIG key), external signal (TRIG/GATE IN), internal gate generator or remote interface.
- Page 6 DC Offset Range: ±10V. DC offset plus signal peak limited to ±10V from 50Ω/600Ω. DC Offset Accuracy: typically ±3% ±10mV, unattenuated. Resolution: 3 digits for both Amplitude and DC Offset. Pulse Aberrations: <5% + 2mV. Aux Out Multifunction output user definable or automatically selected to be any of the following: Waveform Sync: A square wave at the main waveform frequency.
-
Page 7: Safety
Safety This generator is a Safety Class I instrument 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 8: Ec Declaration Of Conformity
Cambridgeshire PE29 7DR England declare that the TG2000 20MHz DDS 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 the following specifications which have been listed in the Official Journal of the European Communities. -
Page 9: Emc
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 the following standards: Emissions EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use. Test limits used were: Radiated: Class B Conducted: Class B... -
Page 10: Installation
Separate the case halves. Visit www.tti-test.com for further details. 3) Remove the screws securing the pcb to the case lower and lift out the pcb with front and rear panels attached;... -
Page 11: Connections
Connections Front Panel Connections MAIN OUT This is the output from the main generator; output source impedance can be set to 50Ω or 600Ω. It will provide up to 20V peak−to−peak e.m.f. which will yield 10V peak-to-peak into a matched load. -
Page 12: Rear Panel Connections
Rear Panel Connections RS-232 9−pin D−connector compatible with addressable RS-232 use. The pin connections are shown below: Name Description − No internal Connection Transmitted data from instrument Received data to instrument − No internal connection Signal ground − No internal connection RXD2 Secondary received data TXD2... -
Page 13: General
General Initial Operation This section is a general introduction to the organisation of the instrument and is intended to be read before using the generator for the first time. Detailed operation is covered in later sections starting with Standard Waveform Operation. In this manual front panel keys and sockets are shown in capitals, e.g. - Page 14 Display Contrast All parameter settings are displayed on the 20 character x 4 row backlit liquid crystal display (LCD). The contrast may vary a little with changes of ambient temperature or viewing angle but can be optimised for a particular environment by using the front panel contrast control. Insert a small screwdriver or trimmer tool through the adjustment aperture marked LCD and rotate the control for optimum contrast.
- Page 15 Principles of Editing Each screen called up by pressing a soft-key on the top level MENU display shows parameter value(s) and/or a list of choices. Choices are made using the soft−key associated with the screen item to be selected. Parameter values can be edited by using the ROTARY CONTROL in combination with the left and right arrowed CURSOR keys, or by direct numeric keyboard entry;...
-
Page 16: Standard Waveform Operation
Standard Waveform Operation When first switched on, and at all subsequent power-ups, unless specified otherwise on the UTILITY menu, the generator will be set to the factory defaults (Appendix 2), with the MAIN OUT off. The basic parameters can be changed as described below. Setting Generator Parameters Main Menu The starting point for changing any parameter is the Main Menu, accessed by pressing the MENU... - Page 17 Amplitude AMPLITUDE Vpp ◊ +4·00 Vpp ◊ srce:50Ω load:hiZ ◊ Pressing the AMPLITUDE soft-key on the main menu gives the AMPLITUDE screen. The actual source impedance of the generator can be set to either 50Ω (factory default) or 600Ω with alternate presses of the srce (source) soft-key.
- Page 18 with the cursor in the most significant digit, the rotary control will decrement the offset in 100mV steps as follows: program = +205 mVdc program = +105 mVdc program = +005 mVdc program = −095 mVdc program = −195 mVdc The actual DC offset at the MAIN OUT socket is attenuated by the fixed−step output attenuator when this is in use.
-
Page 19: Aux Output
Symmetry can only be varied for squarewave and pulse waveforms; selecting SYMMETRY any other waveform will cause the error message Symmetry has no effect on this wave to be displayed before the SYMMETRY screen is shown. For squarewave and pulse waveforms the symmetry can be set between 20% and 80% (mark:space). -
Page 20: Warnings And Error Messages
Warnings and Error Messages Two classes of message are displayed on the screen when an illegal combination of parameters is attempted. WARNING messages are shown when the entered setting causes some change which the user might not necessarily expect. Examples are: Changing the amplitude from, for example, 2·5 Volts pk−pk to 25mV pk−pk brings in the step attenuator;... -
Page 21: Sweep Operation
Sweep Operation General Principles of Sweep Operation All waveforms can be swept phase-continuously from 0.2Hz up to the maximum frequency for the selected waveform. Although the frequency is stepped, not truly swept as in an analogue generator, the short step interval (100us) gives a close approximation to an analogue instrument except for the widest sweeps in the shortest time;... - Page 22 Menus for setting up the range, time (sweep rate), type (continuous, triggered, etc.) spacing (lin/log) and marker position are all accessed from this screen using the appropriate soft−key. In addition the control screen for manual sweep (i.e. sweeping using the rotary control) is selected from this screen and Sweep Mode itself is turned on and off with alternate presses of the soft−key;...
- Page 23 This screen is used to set the sweep mode (continuous; triggered; hold and reset; manual) and sweep direction. Successive presses of the direction soft−key select one of the following sweep directions: start frequency to stop frequency. down stop frequency to start frequency. up/down start frequency to stop frequency and back to start frequency.
- Page 24 Before manual control can be used, manual must be selected on the SWEEP TYPE screen, see above; if manual has not been set, the message manual sweep mode not selected will be displayed before the menu is shown. In manual mode the frequency can be stepped through the sweep range, defined on the SWEEP RANGE screen, using the rotary control.
- Page 25 Frequency Stepping Resolution The generator frequency is stepped, not truly linearly swept, between the Start and Stop frequencies. The number of discrete frequency steps in a sweep is determined by the sweep time set on the SWEEP TIME screen; the size of each step, i.e. the frequency stepping resolution, is determined by the number of steps and the sweep range (set on the SWEEP RANGE...
-
Page 26: Gated Mode
Gated Mode General In Gated mode the generator outputs the waveform whenever the gating signal is high. The generator is not synchronised with the gate source and the start and stop phase of the generator waveform is therefore unpredictable. Except for the ability to turn the output signal on and off, Gated mode is identical to Continuous mode. -
Page 27: Tone Mode
Tone Mode General In Tone mode the output is stepped through a user−defined list of up to 16 frequencies under the control of the selected trigger source. The frequency list is defined using the TONE SETUP screen and the trigger source is selected on the TRIG/GATE SETUP screen. Tone mode is tone MODE turned on using the... -
Page 28: Fsk
General FSK (Frequency Shift Keying) mode permits fast phase-continuous switching between two frequencies within the range of 1Hz to 20MHz. All other parameters of the waveform (amplitude, offset, symmetry) remain the same as the frequency is switched. FSK mode is turned on by pressing the soft-key on the MODE screen, called by pressing... -
Page 29: Modulation
Modulation Amplitude Modulation of the carrier is possible by applying a suitable signal (which can be AC coupled if required) to the front panel VCA IN socket. A positive voltage increases the output amplitude and a negative voltage decreases the amplitude. The modulating signal is applied at the appropriate level to obtain the modulation depth required at the set output amplitude. -
Page 30: System Operations From The Utility Menu
System Operations from the Utility Menu Pressing the UTILITY soft-key on the main menu calls a list of further menus which give access to various system operations including storing/recalling set−ups from non−volatile memory, error messages, power-on settings and calibration. Storing and Recalling Set-ups Complete waveform set−ups can be stored to or recalled from non−volatile RAM using the menus called by the store... - Page 31 The setting loaded can be selected with the appropriate soft−key to be default values (the default setting), restore last setup (i.e. the settings at power down are restored at power up) or any of the settings stored in non−volatile memories 1 to 9. Default values restores the factory default settings, see Appendix 2.
-
Page 32: Calibration
Calibration All parameters can be calibrated without opening the case, i.e. the generator offers ‘closed−box’ calibration. All adjustments are made digitally with calibration constants stored in Flash. The calibration routine requires only a DVM, an oscilloscope and a frequency counter and takes no more than a few minutes. -
Page 33: Calibration Routine
Using the Password to Access Calibration or Change the Password With the password set, pressing calibration... on the UTILITIES screen will now show: ENTER PASSWORD ---- When the correct password has been entered from the keyboard the display changes to the opening screen of the calibration routine and calibration can proceed as described in the Calibration Routine section. -
Page 34: Remote Calibration
Each adjustment step allows the processor to calculate a calibration constant which is stored in Flash. Because each step allows a very wide adjustment range it is possible to stop the instrument functioning completely; if this is suspected the default values listed above should be set and a complete recalibration should then be performed. -
Page 35: Remote Operation
Remote Operation The instrument can be remotely controlled via its RS-232 or USB interfaces. When using RS232 it can either be the only instrument connected to the controller or it can be part of an addressable RS-232 system which permits up to 32 instruments to be addressed from one RS-232 port. The USB interface operates internally through the instrument's RS232 interface. - Page 36 RS-232 Interface RS-232 Interface Connector The 9−way D−type serial interface connector is located on the instrument rear panel. The pin connections are as shown below: Name Description − No internal connection Transmitted data from instrument Received data to instrument − No internal connection Signal ground −...
- Page 37 The wiring of the adaptor cable is shown below: All instruments on the interface must be set to the same baud rate and all must be powered on, otherwise instruments further down the daisy chain will not receive any data or commands. The other parameters are fixed as follows: Start Bits: 1 Parity: None...
- Page 38 Because of the asynchronous nature of the interface it is necessary for the controller to be informed that an instrument has accepted the listen address sequence and is ready to receive commands. The controller will therefore wait for Acknowledge code, 06H, before sending any commands, The addressed instrument will provide this Acknowledge.
-
Page 39: Usb Interface
The instrument is supplied with a disk containing drivers for various versions of Windows. Any driver updates are available via the TTi website, www.tti-test.com. The disk also contains a text file with information and details of the software installation procedure. -
Page 40: Remote Commands
Remote Commands RS-232 Remote Command Formats Serial input to the instrument is buffered in an input queue which is filled, under interrupt, in a manner transparent to all other instrument operations. The instrument will send XOFF when the queue is nearly full; XON will be subsequently be sent when sufficient space becomes available for more data to be received. - Page 41 Frequency and Period These commands set the frequency/period of the generator main output and are equivalent to pressing the FREQ key and editing that screen. WAVFREQ <nrf> Set the waveform frequency to <nrf> Hz. WAVPER <nrf> Set the waveform period to <nrf> sec. Amplitude and DC Offset AMPL <nrf>...
- Page 42 Miscellaneous Commands ∗ Returns the instrument identification. The exact response is IDN? determined by the instrument configuration and is of the form <NAME>, <model>, 0, <version><rmt>where <NAME> is the manufacturer’s name, <MODEL> defines the type of instrument and <VERSION> is the revision level of the software installed. ADDRESS? Returns the bus address of the instrument.
-
Page 43: Maintenance
Maintenance The Manufacturers or their agents overseas will provide a repair service for any unit developing a fault. Where owners wish to undertake their own maintenance work, this should only be done by skilled personnel in conjunction with the service manual which may be purchased directly from the Manufacturers or their agents overseas. -
Page 44: Appendix 1. Warning And Error Messages
Appendix 1. Warning and Error Messages Warning messages are given when a setting may not give the expected result, e.g. DC Offset attenuated by the output attenuator when a small amplitude is set; the setting is, however, implemented. Error messages are given when an illegal setting is attempted; the previous setting is retained. The last two warning/error messages can be reviewed by selecting last error from the... -
Page 45: Appendix 2. Factory System Defaults
Appendix 2. Factory System Defaults The factory system defaults are listed in full below. They can be recalled by pressing recall... by the remote command ∗RST. on the UTILITIES menu followed by set defaults Main Parameters Std. Wave: Sine Frequency: 10kHz Output: +4·0Vpp... - Page 46 Thurlby Thandar Instruments Ltd Glebe Road, Huntingdon, Cambridgeshire PE29 7DR, England Telephone: +44 (0)1480 412451 Fax: +44 (0)1480 450409 e mail: sales@tti-test.com International website: www.tti-test.com UK website: www.tti.co.uk Book Part No. 48591-1020 Issue 5...