The following picture shows a typical gain calibration setup using external voltage probes. Both probes
must be connected to the same signal during Thru calibration.
Figure 10-3: Thru calibration setup for gain/phase measurement using scope probes.
Hint: If you use external scope probes, you can also adjust the probes manually using the
compensation screw at the probe tip. To do so, perform a continuous gain/phase sweep over
the frequency range of interest and adjust the probe compensation until you receive a flat
0 dB and 0 ° line. Mark the probes with Channel 1 and Channel 2 such that you can re-use
the similarly adjusted probes.
Hint: When measuring a transfer function directly in a circuit you can always check your
calibration by connecting both probes to the same point in the circuit. The result must show
0 dB and 0 °. Please note that this measurement might be influenced by additional noise
from the circuit.
90
OMICRON Lab
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