SPECIFICATIONS FREQUENCY All waveforms are available up to 10MHz. However, the purity of triangle, ramp, and multi-level squarewave waveforms is not specified above the frequencies indicated in the following section. Range | 0.1mHz to 10MHz | Resolution | 7 digits or 0.1mHZ | Accuracy | Typically <?10ppm for 1 year, 18oC to 28oC | Tempco. | Typically <1ppm/oC |
WAVEFORMS Sinewave Distortion | <0.3% to 500kHz, -60dBc to 20kHz, <-50dBc to 1MHz, <-35dBc to 10MHz (typically -40dBc) | Spurii | Non harmonically related spurii typically <-65dBc to 1MHz, <-65dBc +6dB/Octave above 1MHz |
Squarewave Triangle Linearity error | <0.5% to 30kHz |
Positive and Negative Ramp Linearity error | <0.5% to 30kHz |
Positive and Negative Pulse Multi-Level Squarewave Up to 16 steps available per cycle, each step selectable for amplitude (10 bit resolution) and duration (1 to 1024 samples). Above 27kHz a 36ns edge uncertainty is introduced. Arbitrary (and Complex) A number of ?complex? waveforms are pre-programmed in ROM . A further 5, user defined, waveforms may be loaded via the digital interfaces and stored in non-volatile RAM. Frequency range: All waveform points can be continuously output up to 27kHz, beyond which they are sampled No. of Samples | 1024 10 bit samples |
Noise Wideband noise with variable amplitude and offset. SYMMETRY Range | Sine,Triangle, Ramp - 1% to 99% at all frequencies; Other waveforms - 1% to 99% to 30kHz, 20% to 80% to 10MHz | Resolution | 0.1% |
MAIN OUTPUT Output Impedance | 50Ohm or 600Ohm switchable | Amplitude | 5mV to 20V pk-pk open circuit (2.5mV to 10V into 50W/600W). |
Output can be specified as EMF (open circuit value) or PD (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 | Typically ?3% ?1mV at 1kHz into 50W/600W | Flatness | ?0.2dB to 200kHz; ?1dB to 5MHz; ?2.5dB to 10MHz | Pulse Aberrations | <5% + 2mV | DC Offset | ?10V from 50W/600W. DC offset plus signal peak limited to ?10V from 50W/600W | Resolution | 3 digits or 1mV for both amplitude and offset |
MODULATION MODES Trigger/Burst Phase coherent signal keying - each positive edge of the Trigger signal will produce one burst of the carrier, starting and stopping at the phase angle specified by the Start/Stop phase setting. Carrier frequency | 0.1mHz to 10MHz | Carrier waveforms | All | Number of cycles | 1 to 1023 (resolution 1 cycle) or 0.5 to 511.5 (resolution ? cycle) | Trigger rep. rate | dc to 50kHz internal,dc to 1MHz external | Source | Internal from keyboard or trigger generator. External from EXT TRIG input or remote interface |
Gated Non phase-coherent signal keying - output is On while Gate signal is high and Off while low. Carrier frequency | From 0.1mHz to 10MHz | Carrier waveforms | All | Trigger rep. rate | dc to 50kHz internal, dc to 1MHz external | Gate source | Internal from keyboard or trigger generator. External from EXT TRIG input or remote interface |
Sweep Carrier waveforms | All | Sweep Mode | Linear or logarithmic, single or continuous | Sweep Width | 0.1mHz to 10MHz. Phase continuous. Independent setting of the start and stop frequency. | Sweep Time | 10ms to 999s (3 digit resolution) | Markers | Two markers variable during sweep. Available at the TRIG/SWEEP OUT socket | Sweep Trigger Source | The sweep may be free run or triggered from keyboard, EXT TRIG input, remote interface |
Amplitude Modulation Carrier frequency | 0.1mHz to 10MHz | Carrier waveforms | All | Depth | 0 to 100%, resolution 1%. | Internal source | 1kHz fixed sinewave or 0.005Hz to 50kHz square wave | External | See ?VCA In? section |
Frequency Shift Keying (FSK) Phase coherent switching between two frequencies at a rate defined by the switching signal source. Carrier frequency | 0.1mHz to 10MHz | Carrier waveforms | All | Switch repetition rate | dc to 50kHz internal, dc to 1MHz external | Switching signal source | Internal from keyboard or trigger generator. External from EXT TRIG input or remote interface |
Hop Up to 16 different ?hop? waveforms can be defined in terms of function, frequency, amplitude, offset and duration. Duration settable per step 1ms to 60s. START/STOP PHASE Carrier frequency | 0.1mHz to 10MHz | Carrier waveforms | All | Range | -360 to +360 degrees | Resolution | 1 degree | Accuracy | Typically 1 degree to 20kHz |
TRIGGER GENERATOR Internal source 0.005Hz to 50kHz squarewave adjustable in 20us steps. 3 digit resolution. Available for external use from TRIG/SWEEP OUT socket AUXILLIARY OUTPUTS Aux Out CMOS/TTL levels with symmetry and frequency of main output and phase of Start-Stop phase setting. Trig/Sweep Out Multi-function output depending upon mode. Except in Sweep mode, the output is that of the Trigger Generator at CMOS/TTL levels from 1kOhm. In Sweep mode the output is a 3-level waveform, changing from high (+4V) to low (0V) at the start of sweep, with narrow 1V pulses at each marker point. IINPUTS Ext Trig Frequency Range | DC to 1MHz | Signal Range | TTL (1.5V) threshold; maximum input ?10V | Min. Pulse Width | 50ns |
VCA In Frequency Range | DC - 100kHz | Signal Range | 2.5V for 100% level change at maximum output | Input Impedance | Typically 6kW |
PHASE LOCKING Clock In/Out | TTL/CMOS threshold levels; output impedance typically 50Ws as an output | Sync Out | TTL/CMOS logic levels from typically 50W |
The signals from these sockets are used to phase lock two or more generators. INTERFACES Full remote control facilities are available through the RS232 (standard) or optional GPIB interfaces. RS232 | Variable Baud rate, 9600 Baud maximum. 9-pin D-connector. Fully compatible with Thurlby-Thandar ARC (Addressable RS232 Chain) system | IEEE-488 | Conforming with IEEE488.1 and IEEE488.2 |
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 and recalled from battery-backed memory. | Size | 3U (130mm) height; half-rack (212mm) width, 330mm long | Weight | 4.1kg (9lb) | Power | 230V ?14% 50/60Hz AC or 115V ?14% 50/60Hz AC by internal adjustment; 40VA max. | Operating Range | +5oC to 40oC, 20-80% RH | Storage Range | -20oC to +50oC | Safety and EMC | Complies with EN6010-1 and EN61326 | Options | IEEE-488 interface; 19 inch rack mounting kit |
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