GENERAL INFORMATION
MODULATION OSCILLATOR
Frequency range
0.1 Hz to 500 kHz.
Selection
By keyboard entry of data. Variation by
⇑
/
⇓
keys and by rotary
control.
Indication
7 digits with annunciators.
Resolution 0.1
Hz.
Frequency accuracy
As frequency standard.
Distortion
Less than 0.1% THD in sine wave mode at frequencies up to
20 kHz.
Alternative waveforms
A triangular wave is available for frequencies up to 100 kHz.
A square wave is available for frequencies up to 2 kHz.
Signalling tones
The modulation oscillator can be used to generate sequential (up
to 16 tones) or sub-audible signalling tones in accordance with
EIA, ZVEI, DZVEI, CCIR, EURO1, EEA, NATEL and DTMF*
standards. Facilities are also available for creating and storing
user defined tone systems.
*Requires second modulation oscillator (Option 001) to be fitted.
EXTERNAL
MODULATION
Two independent inputs on the front panel with BNC connectors,
EXT MOD 1 and EXT MOD 2. The modulation is calibrated
with 1.4.4 V peak (1 V RMS) sine wave applied. Input
impedance 100 k
Ω
nominal.
MODULATION ALC
The EXT MOD 1 and EXT MOD 2 modulation inputs can be
levelled by an ALC system.
Level range
1 V to 2 V peak (0.7 V RMS to 1.4 V RMS) sine wave.
Distortion
Less than 0.1% additional distortion for frequencies up to 20 kHz
(typically less than 0.1% up to 50 kHz).
1 dB bandwidth
Typically 10 Hz to 500 kHz.
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