GENERAL INFORMATION
1-16
Internal modulation oscillator
The internal modulation source is capable of generating up to two simultaneous signals
into any one of the modulation systems.
Frequency range: 0.1 Hz to 50 kHz (16 MHz with Option 005)
Resolution: 0.1 Hz or 5 digits
Accuracy: As frequency standard
Distortion: < 0.1% for a sine wave at 1 kHz
Waveforms: In addition to a sine wave, the following waveforms can be generated:
Triangle 0.1 Hz to 10 kHz (2 MHz with Option 005)
Ramp 0.1 Hz to 10 kHz (2 MHz with Option 005)
Square 0.1 Hz to 5 kHz (1 MHz with Option 005)
Note: modulation frequency can be set to 50 kHz irrespective of waveform type
Level: Modulation source signals are available on the rear-panel I/AM OUT and Q/FM OUT at a
level of 1 V peak EMF from a 50 Ω source impedance.
External modulation source
External inputs are available with a selectable input impedance of 50 Ω or 100 kΩ
(default setting), AC or DC coupled.
Input level: Apply 1 V RMS (default) or 1 V peak for the set modulation.
A HI/LO indicator appears on-screen when the applied signal is greater than ± 6% from
the nominal.
External AM is input to the EXT I/EXT AM front-panel BNC connector.
External FM is input to the EXT Q/EXT FM front-panel BNC connector.
SWEEP FACILITY
Provides a digital sweep of RF frequency or RF level in discrete steps.
The sweep can be set to be continuous, single or externally triggered from the rear
panel. TTL BNC female rear panel.
Control parameters: Start and stop values of carrier frequency, step size, number and step time
Frequency sweep: Linear step size: 1 Hz minimum
Logarithmic: 0.01% to 50%, 0.01% step
Level sweep: 0.01 dB minimum step
Step time: 2.5 ms to 10 s per step with 0.1 ms resolution (20 ms for mechanical attenuator,
Option 002).
Modulation oscillator: 0.1 Hz minimum frequency step
LIST MODE
Up to 500 frequencies and levels can be entered in the list. Start address, stop address
and dwell time can be controlled. Dwell time can be set from 500 ms to 10 s. Requires
Option 003 electronic attenuator.
NON-VOLATILE MEMORY STORES
Full instrument configurations can be saved to 100 memory stores (0–99)
FREQUENCY STANDARD
10 MHz OCXO fitted as standard. Standby power is provided while the instrument is off
but connected to the supply.
Aging rate: < ± 0.8 x 10
−7
per year after 30 days’ continuous use
Temperature coefficient:
< ±5 x 10
−8
over the temperature range 0 to 50°C
Output frequency: Within 2 x 10
−7
of final frequency after 10 minutes from connecting supply power and
switching on at a temperature of 20°C.
Output:
Rear-panel BNC connector provides an output of 2 V pk-pk from 50 Ω.
External standard input: Rear-panel BNC connector accepts an input of 1 MHz or 10 MHz at a level of 300 mV to
1.8 V RMS into 1 kΩ
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