Instron 4400 Series Operator's Manual page 124

Electronic Limits
(c) Press ENTER on the keypad. The number stops flash-
(d) Press the CROSSHEAD ACTION key for the limit
(e) To set a crosshead action to occur at specimen break,
EXAMPLE:
Crosshead to stop at a maximum load of 200 lb, and to
return to gauge length if specimen breaks.
Enter the key sequence:
[LOAD MIN] [2] [0] [0] [ENTER] [STOP] [BREAK]
[RETURN]
Whenever one of the limit condition LEDs, or the
BREAK LED, is lit, one of the four crosshead action
5-32
limit value (maximum or minimum load or
strain) must also be negative. Press the +/- key
on the keypad to obtain the correct sign when
setting a limit.
2. If the sign (+ or -) of the output signal of the
load cell (or strain transducer) in use is nega-
tive (-) with increasing load (or strain), the
Series 4400 system considers the most nega-
tive value as the minimum load (or strain). For
example: If load limits of -300 lb and -100 lb are
specified for a test, set the minimum load
(LOAD MIN key) to -300 lb, and the maximum
load (LOAD MAX key) to -100 lb.
ing.
just entered. Indicator LEDs (ACTION and
STATUS) for the limit will light.
press the BREAK key and then a CROSSHEAD AC-
TION key.
M10-94400-1