Differential-Mode Signal Range; Attenuation Settings; Dc Reject - Tektronix P6246 Mode D'emploi

differential signal. Repeat the procedure to test the other output of
the differential signal.

Differential-Mode Signal Range

The differential-mode signal range is the maximum voltage
difference between the (+) and (- - ) inputs that the probe can accept
without distorting the signal. The distortion from a voltage that is too
large can result in an invalid measurement. For specifications, refer
to page 25.

Attenuation Settings

The differential probe has two attenuation settings: ÷ 1 and ÷ 10.
The ÷ 1 setting provides the best signal-to-noise performance with
low amplitude signals. The ÷ 10 setting increases the differential-
mode signal range by a factor of 10.

DC Reject

The DC Reject mode eliminates the DC component from the probe
output. DC reject is useful when using the probe with instruments
that do not allow DC to be applied to their inputs (such as spectrum
analyzers), or when measuring small amplitude signals superimposed
on a large differential offset component.
DC reject generates an internal offset that cancels the DC component
of the signal. This nulling method eliminates the need for input
coupling capacitors which would greatly degrade CMRR perfor-
mance and require plug-on attachments for the probe tip.
Because the input is always directly coupled, the DC reject mode
does not increase the common and differential mode dynamic ranges
for DC components. The DC reject mode also disables any capability
of external offset adjustment.
P6246 & P6247 Instructions
Operating Basics
15