Theory of operation
Input voltage
The maximum inp
ut voltage is the maximum voltage to ground that the inputs can
withstand w ithout damaging the probe input circuitry. The P7700 Series active
probe tips include some over-voltage protection circuitry at the probe tip signal
inputs. (See Figure 5.) Transient voltage suppression diodes, Da and Db, provide
bidirectional voltage clamping of signals applied to the probe tip inputs. These
TVS diodes limit potential ESD damage as well as signal over-voltage damage to
theactivet
ip buffer amplifier device.
CAUTION. To avoid damaging the inputs of the probe, do not apply more than
±15 V (DC + peak AC) between either probe input and g round.
CAUTION. To avoid ESD damage to the probe, always use an antistatic wrist
strap (provided with your probe), and work at a static-approved workstation
when handling the probe.
Operating voltage window
The operating voltage window defines the input signal voltage range within which
probe measurements can be made with good fidelity. The operating voltage
window limits for the TekFlex solder-in tips are shown as the larger gray square
in the following figure.
Figure 6: Operating voltage window (TekFlex solder-in tips)
The A operating voltage window range of ±5.25 V is shown on the vertical axis
and the B operating voltage window range of ±5.25 V is shown on the horizontal
axis. The dynamic range is also shown on the figure as the smaller green square.
The P7700 solder tip single-ended dynamic range for both the A and B inputs is
2.5 V
p-p
. Differentially, the solder tip dynamic range is 5 V
p-p
.
P7700 Series TriMode Probes Technical Reference 13
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