Telequipment Oscilloscope Calibrator C3

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Oscilloscope Calibrator

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(All files in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Telequipment C3 is a solid state oscilloscope calibrator.
From the manual:
The Calibration Unit Type C3 is a small portable mains-operated instrument for use in service centres. It provides a wide range of output signals, with a high degree of accuracy as shown in the Specification, for test and calibration purposes.


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Markers 100 nsec, to 5 secs. in 1-2-5 sequence (24 position switch).

Pulse amplitude ~1 V approximately.
Pulse width at mid point approximately 2% of repetition period.
Accuracy ±0.01%.

Amplitude Calibrator Square waves switched at 10kHz, 1kHz, 50Hz, 10Hz, 1Hz, also DC.

Amplitude 100 volts to 0.025 volts and 100mV to 0.025mV in 1-2-5 sequence (11 position switch with 1000:1 attenuator).
Rise time ≤ 100 nsecs. Deteriorates due to capacity loading on high output impedances.
The 50Hz output has rise times of 400 μs.
Accuracy ±0.2% when loaded with 1MΩ except 0.05 V/mV ±0.3% and 0.025 V/mV ±0.35%
Output impedance varies from 5 kΩ at 50 V and 50 mV down to 75Ω at ≤ 0.5 V and 0.5 mV.

Fast Rise Signal Square waveform switched at 100kHz, 1MHz, 1OMHz.

Risetime ≤ 1 nsec.
Output 0.2 V maximum into terminated 50 Ω load.

Television Waveform A 625 line signal, +ve and —ve modulation.

Amplitude 1.6V peak to peak. Output impedance 75ohm.
-ve going output is DC coupled from earth, +ve going output is AC coupled.
Modulation is switch selected as:

62.5kHz )
250kHz )
1MHz ) square waves.
5MHz )

Also modulation can be switched on and off at 1 sec rate.

Auxiliary Outputs Available on 4mm sockets at the side.

Square waves at 10 MHz, 1 MHz, 100 kHz, 10 kHz, 1 kHz, 100 Hz, 10 Hz, 1 Hz.
Amplitude 2.5 volts approximately.
Output impedance 1 kΩ approximately.

Ext Clock External clock frequencies of 2V peak to peak amplitude may be fed to the 1O MHz Auxiliary Output socket.
Power Supply 100, 110, 120, 200, 220, 240 V, 48 to 440 Hz, 13 VA.
Size Height 107 mm

Width 228 mm
Depth 285 mm