Red Activity Leds - Instron 4400 Series Operator's Manual

Rear Panel Indicators
MAIN CONSOLE
BOARD
Figure 8-1.

Red Activity LEDs

Each section with a microprocessor has a red ACTIV-
ITY LED; these include the CPU, the IEEE-488 Inter-
face section, and the Front Panel section. During normal
operation, the ACTIVITY LEDs flash about once per
second to indicate that the processor is running. A
steady on or off ACTIVITY LED indicates a serious fail-
ure. Continuous rapid flashing of the CPU ACTIVITY
8-12
Rear Panel Indicators
M10-94400-1
STRAIN BOARD
(When Installed)
IEEE-488
BOARD (When
Installed)