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1159A 1GHz Active Differential Probe
Adjustment of 10:1 and 20:1 Attenuators
Adjustment of 10:1 and 20:1 Attenuators
10:1 and 20:1 attenuators are supplied with the 1159A probe. This attenuator is
matched to the probe and should require no further adjustment. Each attenuator
is labeled with a serial number that matches the last four digits of the probe serial
number. Identify matching probes and attenuators using this number. If you
purchase new attenuators for the probe, you must adjust them to match the
probe.
Optimizing CMRR for an Attenuator
For optimum CMRR when the attenuator is connected to the probe, the DC and
HF attenuation should be the same for both active inputs of the probe. Three
trimmers are provided in the attenuator to match the two active inputs. The
adjustments are located under the serial number label. Apply a new label after
calibration and mark this label with the last four digits of the probe’s serial
number. Only adjust an attenuator if it is not the original attenuator shipped with
the probe.
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