A
local clock
set up through the Time Management Page: This option will appear
under the name of the local clock you have set up (see "Local Clock(s), DST" on
page 157). Local timescale allows a Local Clock to apply a time offset for Time
Zone and DST correction.
Amplitude
: The peak-to-peak output voltage level into a 600 Ω load is adjusted by enter
ing a digital control value in this field. The level adjustment has no effect on TTL outputs,
only on AM formats. The value of 128 will cause the Mark amplitude to be about 5V
p-p
into high impedance. A value of 200 results in an output amplitude of about 9V
p-p
into
high impedance.
Note:
These are nominal values only. Actual values will vary from unit to
unit. To adjust the level precisely, connect an oscilloscope to the output con
nector when adjusting.
Offset
: Provides the ability to account for IRIG cable delays or other latencies in the IRIG
input. The Offset value is entered and displayed in nanoseconds (ns). The available Off
set range is -500 to +500 ms.
Each IRIG code specifies a carrier frequency that is modulated to encode date and time, as well
as control bits to time-stamp events. Initially, IRIG applications were primarily military and gov
ernment associated. Today, IRIG is commonly used to synchronize voice loggers, recall record
ers, and sequential event loggers found in emergency dispatch centers and power utilities.
For more information on IRIG frequency and output specifications, see "IRIG Standards and
Specifications" on page 413.
5.2.4.6
Configuring an ASCII Time Code Output (RS-232 or RS-485)
Note:
The process of configuring the ASCII Time Code output is independent of
the communications protocol.
Via
INTERFACES
>
OUTPUTS
[
or
:
INTERFACES
>
OPTION CARDS
], navigate to the
ASCII Out
put
you want to configure. Depending on which path you take, you will need to click the GEAR
button, or Edit button in order to open the
Edit
window:
NetClock User Reference Guide
355
APPENDIX
Содержание NetClock 9400 Series
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