Contents
Features
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Serial time code output on regular 2-conductor
shielded cable.
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Daylight Savings/Standard Time switch.
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Local display uses large, bright LED digits
and can be switched between 12 and 24 hour modes.
-
Can be optionally referenced to NTSC color
subcarrier (Model CLK-50-1).
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Optional battery backup available (for model CLK-50-1 only).
Description The CLK-50
is designed for those installations where only digital time displays are
needed. It fits into standard racks occupying only 1 rack-unit. The local
display is viewable up to a distance of 12 ft. (4 m). The output
is DQS time code which is a pulse-width modulated code transmitted on RS-422
signal levels. The time is transmitted in 24-hour format only, at a rate
of 30 Hz. Of course, this does not mean that the time will be displayed
only in 24-hour mode on our remote time displays
since all of our time displays are capable of being switched to 12-hour
mode as well. With just
a flick of a switch, the CLK-50 is also capable of switching not only its
local display, but all of the remote time displays
attached to it, to either Standard Time or Daylight Savings Time instantly.
This makes a strong argument for customers who currently use impulse driven
analog clocks and who are considering switching to all-digital time displays
because of their advantages over analog clocks. Those customers who do
have impulse driven analog clocks are all too familiar with the pain and
aggravation associated with adjusting them to either time standard. It
is a time and labor consuming task to re-adjust those clocks twice a year,
which can generally only be done during off-peak hours. Also, because digital
clocks switch instantly, it avoids the confusion that is often encountered
when inadvertantly reading time from an analog clock while it's being re-adjusted. The standard
CLK-50 model references to either 50 or 60 Hz power line frequency which
it automatically detects and adjusts itself accordingly. This offers reasonable
accuracy over a long period of time. For our customers who wish higher
accuracy and whose facilities are equipped with a sync generator, we offer
a variant, the CLK-50-1, which includes the optional
capability to be referenced to NTSC color subcarrier. The optional
battery backup (BAT-50) is only offered for the
CLK-50-1 and allows it to keep time for up to an hour while the main power
is off. The battery itself is simply a rechargeable 9V battery. The local controls are as
follows:
|
START |
Starts the clock. |
|
HOLD |
Stops the clock. |
|
2X |
Run double speed. |
|
RESET |
Reset to allow initial setting. |
|
12/24 |
Switch local display for
either 12 or 24 hour mode. |
|
DST/STD |
Switch time for either Daylight
Savings Time or Standard Time. |
Specifications
Display: 0.8"
(20.3 mm), bright red LED.
Dimensions:
1 rack-unit --- 19" W x 1.75" H x 8.25" D (483 x 44.5 x 210 mm).
Optional NTSC S/C ref. input:
3.579545 MHz sinewave, 2V p-p.
Time code output:
DQS time code transmitted using RS-422 signal levels. Balanced, low Z.
Output drive capacity:
50 remote time displays, up to 4000 ft.
Important!
The accuracy
of this clock is entirely dependent on where it gets it's reference from.
For the CLK-50, accuracy depends on the local power line frequency. For
the CLK-50-1, accuracy depends on the accuracy of the NTSC color subcarrier
frequency from the sync generator used. Therefore, we cannot state or guarantee
the accuracy of the CLK-50 based master clocks.
Ordering Info When placing an order with us, please refer
to the model numbers below:
CLK-50 --- This is the standard
model that references to 50 or 60 Hz power line frequency.
CLK-50-1 --- This model is a CLK-50
that includes the NTSC color subcarrier reference circuit.
BAT-50 --- This is the optional
battery backup for the CLK-50-1. |
