TG1000 & TG2000
- 10MHz & 20MHz DDS function generators
- Sweep, AM, FSK & Tone switching modes
- RS-232 and USB interfaces (TG2000 only)
- Direct Digital Synthesis
Ease of use
The TG1000 and TG2000 are particularly easy to use. All of the main information is clearly displayed on a backlit LCD with 4 rows of 20 characters. Sub menus are used for the modulation modes and other complex functions. All parameters can be entered directly from the numeric keypad. Alternatively most parameters can be incremented or decremented using the rotary encoder for quasi-analogue control.
Frequency or period entry
The generator frequency can be set in terms of either frequency or period. Numeric entry is floating point using whatever units the operator prefers.
Flexible amplitude entry
Amplitudes can be entered in terms of peak to peak voltage, RMS voltage or dBm. The output impedance can be set to 50 or 600, and the amplitude can be set in terms of either the voltage into the correct termination, or the source EMF (for a high impedance load).
Quick recall of settings
Both generators provide nine memories for storing settings. Because all parameters are controlled electronically, the memories store the full set-up of the instrument and automated test sequences are easy to set up. In addition to the nine user memories, the current state of the instrument is saved at switch off. The user can choose to have this state restored at switch on, or choose a pre-defined default set-up.
Synchronisation
The auxiliary output socket can provide any one of three different Sync. signals. Waveform Sync is a 50% duty cycle square wave at the frequency of the main output. Sweep Sync. outputs a pulse at the start of each sweep and can also output a pulse at a user defined marker frequency. Trigger Out provides a replica of the trigger signal which can be from the trigger input socket, the internal trigger/gate generator, the manual trigger key, or the bus interface.
Modulation modes
Sweep All waveforms can be swept over their full frequency range (0.2Hz minimum) at a rate variable between 50 milliseconds and more than 15 minutes. The sweep is fully phase continuous. Sweep can be linear or logarithmic, single or continuous. Single sweeps can be triggered from the front panel, the trigger input, or the digital interfaces. A sweep marker is provided that is adjustable whilst sweep is running. The markers can provide a visual indication of frequency points on a ‘scope or chart recorder.
Gated The Gated mode sets the output signal on or off depending on the gating signal state. The gating source can be the front panel key, internal trigger generator, trigger input socket, or bus interface signal.
AM External Amplitude Modulation of up to 100% is available for all waveforms via the VCA input.
FSK Frequency Shift Keying provides phase coherent switching between two selected frequencies at a rate defined by the source. The switching source can be the front panel key, internal trigger generator, trigger input socket, or bus interface signal.
Tone Switching The generator can be set to switch between a number of different frequencies in response to a trigger signal. Up to 16 frequencies can be defined.
See the difference !
Ultimately what matters in a function generator is the quality of the output signal. The TG1000/2000 maintains the TTi reputation for high signal quality at all frequencies and all levels. The waveform capture opposite shows just how much difference that can make ! The 'scope display opposite was captured from two 5MHz square wave signals each at 60mV pk-pk level into 50 . The upper waveform is from a widely available competitive DDS generator. The lower waveform is from a TG2000.
Technical Specifications
Specifications apply at 18°- 28°C after 1 hour warm-up, at maximum output into 50Ω
FREQUENCY
All waveforms are derived from a crystal clock using Direct Digital Synthesis.
Frequency Range:
1mHz to 10MHz (TG1000) or 20MHz (TG2000)
Resolution:
6 digits or 1mHz
Accuracy:
±10ppm for 1 year, 18℃ to 28℃; ±1mHz below 0.2Hz
Tempco.:
Typically ℃ outside of 18℃ to 28℃
WAVEFORMS
Sinewave
Range:
1mHz to 10MHz/20MHz
Resolution:
6 digits or 1mHz
Distortion:
<0.3% THD to 20kHz (typically 0.1%), <-45dBc to300kHz, <-35dBc to 20MHz (typically <-40dBc)
Spurii:
Non harmonically related spurii <-55dBc to 1MHz,<(-55dBc + 6dB/octave) 1MHz to 20MHz
Output Level:
5mV to 20V pk-pk from 50Ω or 600Ω
Squarewave
Range:
1mHz to 10MHz/20MHz
Resolution:
6 digits or 1mHz
Symmetry:
variable 20% to 80% in 1% steps
Aberrations:
<5% + 2mV
Rise & Fall Times:
<22ns
Output Level:
5mV to 20V pk-pk from 50Ω or 600Ω
Triangle
Range:
1mHz to 1MHz
Resolution:
6 digits or 1mHz
Linearity error:
<0.5% to 100kHz
Output Level:
5mV to 20V pk-pk from 50Ωor 600Ω
Positive and Negative Pulse
Range:
1mHz to 10MHz/20MHz
Resolution:
6 digits or 1mHz
Symmetry:
variable 20% to 80% in 1% steps
Aberrations:
<5% + 2mV
Rise & Fall Times:
<22ns
Output Level:
2.5mV to 10V pk-pk from 50/600Ωpositive or negative only pulses with respect to the DC Offset baseline
MODULATION MODES
Continuous
Continuous cycles of the selected waveform are output at the selected frequency.
Gated
Non phase-coherent signal keying - output is On while Gate signal is high and Off while low.
Carrier frequency:
From 0.1Hz to 10MHz/20MHz
Carrier waveforms:
All
Trigger rep. rate:
dc to 100kHz external, dc to 5kHz internal
Gate source:
Front panel MAN TRIG key, Internal Gate Generator,TRIG/GATE input, or Remote Interface
Sweep
Carrier waveforms:
All
Sweep Mode:
Linear or logarithmic, single or continuous
Sweep Width:
0.2Hz to 10MHz/20MHz in one range. Phase continuous.Independent setting of the start and stop frequency
Sweep Time:
50ms to 999s (3 digit resolution)
Markers:
Available from AUX output. Variable during sweep
Sweep Trigger source:
The sweep may be free run or triggered from: front panel MAN TRIG key, TRIG/GATE input, or Remote Interface
Amplitude Modulation
Carrier frequency:
1mHz to 10MHz/20MHz
Carrier waveforms:
All
Modulation source:
VCA IN socket
Frequency Shift Keying (FSK)
Phase coherent switching between two selected frequencies at a rate defined by the switching signal source.
Carrier frequency:
1Hz to 10MHz/20MHz
Carrier waveforms:
All
Switch rate:
dc to 5kHz (internal), dc to 1MHz (external)
Switching signal source:
Front panel MAN TRIG key, Internal Trigger Generator,TRIG/GATE input, or Remote Interface
Tone
The tone is output while the trigger signal is high, and stopped when the trigger signal is low. The next tone is output when the trigger signal goes high again.
Carrier waveforms:
All
Frequency list:
Up to 16 frequencies between 1Hz and 10MHz/20MHz
Min. switching time:
1ms per tone
Switching source:
Front panel MAN TRIG key, Internal Trigger Generator, TRIG/GATE input, or Remote Interface
Internal Trigger/Gate Generator
Period:
0.2ms to 999s (resolution 0.2 ms)
Waveform:
Square wave (1:1 duty cycle)
MAIN OUTPUT
Output Impedance:
50Ω or 600Ω switchable
Amplitude:
5mV to 20V pk-pk open circuit (2.5mV to10V into 50/600Ω)
Output can be specified as V-HiZ (open circuit value) or V (potential difference) in pk-pk, RMS or dBm. Note that in positive or negative Pulse modes the amplitude range is 2.5mV to 10V pk-pk O/C.
Accuracy:
±3% ±1mV at 1kHz into 50Ω/600Ω
Flatness:
±0.2dB to 500kHz; ±1dB to 10MHz; ±2dB to 20MHz
DC Offset:
±10V from 50Ω/600Ω. DC offset plus signal peak limited to ±10V. Accuracy ±3% ±10mV
Resolution:
3 digits for both amplitude and offset
AUXILIARY OUTPUT
Multi-function output user definable to be any of the following:
Waveform Sync:
Outputs a 50% duty cycle squarewave at the main waveform frequency
Trigger Out:
Outputs a replica of the current trigger signal
Sweep Sync:
Outputs a trigger signal at the start of sweep (for synchronising an oscilloscope or chart recorder). Can additionally output a sweep marker.
Signal Levels:
Output Impedance 50Ω nominal. Logic levels of >3V. Sweep Sync is a 3 level waveform, low at start of sweep, high at end of sweep, with a narrow 1V pulse at the marker point
INPUTS
Ext Trig/Gate
Frequency Range:
DC to 1MHz for FSK; DC to 100kHz for Gate; DC to 2.5kHz for Tone and Sweep
Signal Range:
Nominal TTL level threshold; maximum input ±10V
Min. Pulse Width:
100ns for Gate/FSK; 0.2ms for Sweep and Tone
Input Impedance:
Typically 10kΩ
VCA In
Frequency Range:
DC - 100kHz
Signal Range:
2.5V for 100% level change at maximum output
Input Impedance:
Typically 6kΩ
INTERFACES (TG2000 only)
Full remote control facilities are available through the RS232 or USB interfaces.
RS232:
Variable Baud rate (19200 max), 9-pin D-connector. As well as operating in a conventional RS-232 mode the interface can be operated in addressable mode whereby up to 32 instruments can be addressed from one RS-232 port
USB:
Standard USB hardware connection. Conforming USB 1.1
GENERAL
Display:
20 character x 4 row alphanumeric LCD
Data Entry:
Keyboard selection of mode, waveform etc.; value entry direct by numeric keys or by rotary control.
Stored Settings:
Up to 9 complete instrument set-ups may be stored in battery-backed memory.
Size & Weight:
260(W) x 88(H) x 235(D) mm; 2kg (4.5lb)
Power:
100V, 110-120V or 220-240V ±10% 50/60Hz, adjustable internally. 40VA max. Installation Category II.
Operating Range:
+5℃ to 40℃, 20-80% RH
Storage Range:
-20℃ to +60℃
Environmental:
Indoor use at altitudes up to 2000m, Pollution Degree 2
Safety & EMC:
Complies with EN6010-1 and EN61326
商品属性 [频率] 1mHz to 20MHz