Time Electronics 7028 - Function Generator Module
A precision DDS function generator module with 0.001Hz to 10MHz frequency range, 6 digits or 1mHz resolution, and 1ppm stability and 10ppm one year accuracy . The 7028 is simple operation and features AM, FSK, gated and tone switching modes.
Features
High measurement accuracy
DDS (direct digital synthesis) is a technique for generating waveforms digitally using a phase accumulator, a look-up table and a DAC. The accuracy and stability of the resulting waveforms is related to that of the crystal master clock. When correctly engineered, the DDS generator offers not only exceptional accuracy and stability but also high spectral purity, low phase noise and excellent frequency agility.
Wide frequency & amplitude range
The 7028 can generate waveforms between 0.001Hz and 10MHz with a resolution of six digits and a one year accuracy better than 10ppm. Amplitude is variable between 5mV and 20V pk-pk from a source impedance of 50 Ohm or 600 Ohm. Waveform quality remains excellent over the full amplitude range.
Easy and convenient to use
The 7028 is 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.
Sweep
All waveforms can be swept over their full frequency range (0.1Hz minimum) at a rate variable between 20 milliseconds and 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 turns the output signal On when the gating signal is high and Off when it is low. The gating source can be the front panel key, trigger input socket, or bus interface signal.
AM
External Amplitude Modulation 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 switching signal source. The switching source can be the front panel key, internal trigger generator or trigger input socket.
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. The tone is output while the trigger signal is true, and stops (after completion of a full cycle) when the trigger signal is false. The next tone is output when the trigger signal goes true again.
- 0.001Hz to 10MHz frequency range
- 6 digits or 1mHz resolution
- 1ppm stability & 10ppm accuracy
- Multiple instrument set-up storage
- Internal phase continuous sweep
- AM, FSK, gated & tone switching
- 5mV to 20V pk-pk from 50 or 600Ω
Technical Specifications
Frequency
| Frequency Range | 1mHz to 10MHz |
| Resolution | 6 digits or 1mHz |
| Accuracy | <±10ppm for 1 year, 18°C to 28°C |
| Temp Coefficient | Typically <1ppm/°C outside of 18°C to 28°C |
All waveforms are derived from a crystal clock using Direct Digital Synthesis.
Waveforms
|
Sinewave |
Range: 1mHz to 10MHz |
|
Squarewave |
Range: 1mHz to 10MHz |
|
Triangle |
Range: 1mHz to 1MHz |
|
Positive and Negative Pulse |
Range: 1mHz to 10MHz |
Modulation Modes
| 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 |
|
Sweep |
Carrier waveforms: All Sweep Mode: Linear or logarithmic, single or continuous Sweep Width: 0.2Hz to 10MHz. Phase continuous. Independent : setting of the start & stop frequency Sweep Time: 50ms to 999s (3 digit resolution) Markers: Marker variable during sweep. Available at the AUX OUT socket Sweep Trigger source: The sweep may be free run or triggered from: front panel MAN TRIG key, TRIG/GATE input |
|
Amplitude Modulation |
Carrier frequency: 1mHz to 10MHz Carrier waveforms: All Modulation source: VCA IN socket |
|
Frequency Shift Keying (FSK) |
Phase coherent switching between two frequencies at a rate defined by the switching signal source. Carrier frequency: 1Hz to 10MHz Carrier waveforms: All Switch repetition rate: dc to 5kHz (internal), dc to 1MHz (external) Switching signal source: Front panel MAN TRIG key, Internal Trigger Generator, TRIG/GATE input |
|
Tone |
The tone is output while the trigger signal is true, and stops (after completion of a full cycle) when the trigger signal is false. The next tone is output when the trigger signal goes true again. Carrier waveforms: All Frequency list: Up to 16 frequencies between1Hz and 10MHz Min. switching time: 1ms per tone Switching source: Front panel MAN TRIG key, Internal Trigger Generator, TRIG/GATE input. |
|
Internal Trigger/Gate Generator |
Period: 0.2ms to 999s (resolution 0.2 ms) Waveform: Square wave (1:1 duty cycle) |
Main Output
|
Details and Specifications |
Output Impedance: 50 Ohms or 600 Ohms switchable Amplitude: 5mV-20V pk-pk open circuit (2.5mV-10V into 50Ω) 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 50 Ohms/600 Ohms Flatness: ±0.2dB - 500kHz; ±1dB - 10MHz; ±2dB - 20MHz DC Offset: ±10V from 50/600 Ohms. DC offset plus signal peak limited to ±10V. Accuracy ±3% ±10mV Resolution: 3 digits for both amplitude and offset |
Auxiliary Output
|
Details and Specifications |
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 the current trigger signal Sweep Sync: Output a trigger signal at the start of sweep (for synchronising an oscilloscope or chart recorder). Can additionally output a sweep marker. Signal Levels: Logic levels of <0.8V and >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; max input ±10V Min. Pulse Width: 100ns for Gate/FSK; 0.2ms for Sweep and Tone Input Impedance: Typically 10k Ohms |
|
VCA In |
Frequency Range: DC - 100kHz Signal Range: 2.5V for 100% level change at max output Input Impedance: Typically 6k Ohms |
General Specifications
| 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. |
| Module Width | 295mm (primary console fitting only) |
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