page 9 – 17
D-16 / Feb 2003
OPERATION
CLOCK/TIMER SECTION
The CLOCK/TIMER SECTION consists of a digital CLOCK/TIMER
DISPLAY and a set of TIMER CONTROLS. The console timer allows the
operator to determine elapsed time of events.
Digital Timer
The TIMER DISPLAY, located in the METERBRIDGE, shows the
elapsed time in minutes and seconds, up to a maximum elapsed time of 59
minutes and 59 seconds, after which the timer will turn over to zero and
continue.
The timer is provided with an AUTO-RESTART function so pro-
grammed input modules can automatically reset the timer display to zero
and start a new count (if the timer is currently running), allowing the
announcer to easily track his own pace.
The START/STOP button halts the timer, holds the last count, and then
restarts and accumulates the count when depressed again
—
perfect for
compiling tapes of desired duration.
RESET has a dual-mode capability:
- if you depress it while the timer is counting, the display will instantly
reset to zero and start a fresh count;
- if the timer is already stopped, depressing this button will reset the
timer to zero, where it will stay until start is pressed.
The HOLD button allows you to hold the display for a longer viewing
duration, while still allowing the counter to continue in the background.
Releasing the button will then display the current count.
Console Clock
The Wheatstone digital clock is a six-digit time-of-day clock with LED
display. The clock is designed with CMOS circuits and an on-board
crystal-controlled time base oscillator. The clock PCB contains the clock
circuits, clock set controls and capacitor backup on one side and displays
on the other side. Clock set controls may be accessed by opening the
meterbridge cover.
Controls
The clock is controlled by two switches mounted on the bottom part of
the clock PCB assembly.
In order to keep accurate time, the oscillator must run at 32.768 KHz.
The oscillator is set to this frequency at the factory.
D-16 / June 2006
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