Operating Basics
12
P7350 5 GHz Differential Probe Instruction Manual
Input Voltage Limits
The P7350 differential probe is designed to probe low-voltage
circuits. Before probing a voltage, take into account the limits for
maximum input voltage, the common-mode signal range, and the
differential-mode signal range. For specific limits, see
Specifications
on page 21.
Maximum Input Voltage
The maximum input voltage is the maximum voltage to ground that
the inputs can withstand without damaging the probe input circuitry.
CAUTION.
To avoid damaging the inputs of the P7350 differential
probe, do not apply more than
±
15 V (DC + peak AC) between each
input and ground.
Common-Mode Signal Range
The common-mode signal range is the maximum voltage that you
can apply to each input, with respect to earth ground, without
saturating the input circuitry of the probe. A common-mode voltage
that exceeds the common-mode signal range may produce an
erroneous output waveform even when the differential-mode
specification is met. For
Specifications
, refer to page 21.
Differential-Mode Signal Range
The differential-mode signal range is the maximum voltage
difference between the plus and minus inputs that the probe can
accept without distorting the signal. The distortion from a voltage
that is too large can result in a clipped or otherwise distorted and
inaccurate measurement. For
Specifications
, refer to page 21.
Common-Mode Rejection
The common-mode rejection ratio (CMRR) is the ability of a probe
to reject signals that are common to both inputs. More precisely,
CMRR is the ratio of the differential gain to the common-mode gain.
The higher the ratio, the greater the ability to reject common-mode
signals. For additional information about CMRR, see page 18.