12.3.3
Using the GN815 and GN816
WARNING
High bandwidth and measurement cabling
Due to the high bandwidth measurement capabilities of the acquisition card,
combined with the high measurement sensitivity of the card, it is important to
pay close attention to the measurement cabling.
Some advice to prevent measuring unwanted disturbances:
l
Keep measurement cables as short as possible in order to reduce the
reception of environmental disturbances.
l
Use shielded cables. The cable should have the measurement cables
paired inside a shield. Preferably, the shield should be connected to the
chassis of the measurement Genesis High Speed equipment. Alternatively,
the shield could also be connected to the chassis of the object under test.
Shielding
Coaxial
Measurement
cables
Figure 12.24:
Shielded cable
l
For high frequency disturbances where high bandwidth measurement is
not required, the measurement bandwidth can be reduced by using the
lowpass filter of the acquisition card.
l
If unshielded cables are used, keep them as close together as possible, i.e.
position them next to each other (to keep the loop small).
l
Make sure that measurement cables that are used for measuring high
dynamic or distorting signals are not closely positioned to measurement
cables used for measuring small sensitive signals.
GEN3t
I3995-3.1 en HBM: public
281
