B&K Precision 4040B - Manual - Manual (Page 23)

23
1
Sync Out Connector
Use this connector to output a positive TTL sync pulse
generated at each waveform cycle.
Modulation In Connector
5V p-p signal for 100% modulation, 10Kohms input impedance
with DC - >20 KHz bandwidth.
3.5 Output Connections
The waveform generator output circuits operate as a 50
Ω voltage source working into a 50 Ω load. At higher
frequencies, non terminated or improperly terminated
output causes aberrations on the output waveform. In
addition, loads less than 50
Ω reduce the waveform
amplitude, while loads more than 50
Ω increase
waveform amplitude.
Excessive distortion or aberrations caused by improper
termination are less noticeable at lower frequencies,
especially with sine and triangle waveforms. To ensure
waveform integrity, follow these precautions:
1. Use good quality 50
Ω coaxial cable and connectors.
2. Make all connections tight and as short as possible.
3. Use good quality attenuators if it is necessary to
reduce waveform amplitudes applied to sensitive circuits.
4. Use termination or impedance-matching devices to
avoid reflections.
5. Ensure that attenuators and terminations have
adequate power handling capabilities.