Pip Control - Instron 4400 Series Operator's Manual

Pip Control

Pip Control

The capability of event marking the load signal while it
is being recorded is provided through the use of a PIP
jack on the rear connector panel of the testing system. A
pip control device connected to the PIP jack will pro-
duce a small, rapid, vertical deflection, or "pip", of the
recorder pen. The resulting mark on the chart serves as a
convenient reference or "event marker" for indicating
points of interest on a load-elongation curve for a test
specimen.
A pip control device can be one built into an extensome-
ter, or as simple as a hand-held button switch. Control
device options include a Remote Manual Pushbutton (In-
stron Catalog No. 2310-516), an Instron XL Elastomeric
Extensometer, or an Instron Incremental Extensometer.
The pip height is factory set at approximately one chart
division on a 250 mm (10 inch) wide chart. The ampli-
tude is not affected by the automatic ranging of the load
signal.
A pip filter is included in the Pip Control circuit to sup-
press spurious pips from such devices as the Incremental
Extensometer. When the Pip signal is sensed going from
the open condition to the closed condition, as when a
conductive band of the Incremental Extensometer first
passes under the contacts, a pip is reported to the IEEE
Bus and a blanking delay is started. During the delay,
the Pip signal is ignored. When the delay ends, the
search for the next active transition resumes.
A variable blanking period can be entered, either from
the front panel or from a computer connected to the
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