DCD-24 User Manual (rev 1.00)
Page 9
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DCD-24 User Manual (rev 1.00)
6.3. VIEW KEY
The [
view
] key is used to momentarily change the function of the display.
- Reference:
During normal operation, press this key to display the reference.
If the reference is WC, AES or 10MHz, the display indicates the frequency;
If the reference is INT, the display indicates “INT”;
if the reference is VSO, the display indicates the VSO amount in cents;
if the reference is Video, the display alternates between the format and the
frequency of the video ref, for example 1080p and 59.94 Hz (video formats
recognized by the DCD-24 are listed in Appendix 15.1 at the end of this
manual).
- Output Termination:
In SET UP mode, press the [
view
] key to display the output termination
measurements. The 2 digits on the left indicate the selected output while the 3
digits on the right indicate the measured termination in ohms. If nothing is
connected to the selected output (open), 3 dashes appear in the 3 right digits.
While holding the [
view
] key, press the [
up
] or
[
down
] key to change output.
7. Menu Navigation
Menus in the DCD-24 are represented by groups of LED’s. There are 3 of
them, located on the left of the display:
• REFERENCE
• OUTPUT WC RATE
• OUTPUT 17-24.
When you enter the SET UP mode, all the leds of the selected menu are on
solid and all the other parameter leds shut off for about 3/4 sec (this is done
so that you can clearly see which menu is currently selected). In the selected
menu, the current value led is flashing.
To change value, use the [
up
] or [
down
] key. Note that changes take effect
immediately.
To move to another menu, press the [LEFT] or [RIGHT] key. When pressing
the [LEFT] or [RIGHT] key, the cursor will move to the next available menu,
which may not be the adjacent menu. For example, when INT is selected as
a reference, pressing the [RIGHT] key will make the cursor ‘jump’ 2 columns
to the RATE column, skipping the EXTERNAL REFERENCE menu (we are on
INTERNAL) and the OUTPUT RATE MODE (FOLLOW INPUT is not available
with internal reference).
8. Menus Description
8.1. REFERENCE
Choices for Reference are INTERNAL, EXTERNAL and VSO.
- INTERNAL indicates that the DCD-24 is operating as
a master generator on its internal crystal;
- EXTERNAL can be one of the following:
• Word Clock
• AES (AES3id)
• 10 MHz (GPS or Rubidium clock)
• Video Sync (HD or SD - NTSC & PAL).
The external reference is connected to the rear panel universal
input connector (BNC). By selecting an input type, it is assumed
that it corresponds to the actual input signal
- VSO is selected for varispeed operations.
VSO is adjusted in cents (semitone/100). The range goes from +
200
to -
200 (+
to -
2 whole tones), which translates to +12,2562% to
-
10,9101%.
To adjust the VSO amount, press the [
right
] key to move to the
ADJUST menu. Then use the [
up
] or [
down
] keys, reading the
adjusted amount in cents on the display.
8.2. OUTPUT WC RATE
Two modes are available for output rate: FOLLOW INPUT and SET.
- Follow Input:
In FOLLOW INPUT mode, the input rate (the rate
of the reference) is simply transferred to the output.
In this mode, no other adjustment is required. This
mode can be used when distributing a word clock.
Note that even in this mode, the clock is always
regenerated.
FOLLOW INPUT is only available if the reference is Word Clock or AES.
- Set:
In SET mode, you must select a specific rate.
Select SET, then press the [
right
] key once and select one of the standard
rates, from 32KHz to 192Khz, with the [
up
] or [
down
] key.
If required, you can also apply a ‘pull’ coefficient, up or down, or a
combination of coefficients. Press the [
right
] key once and select the right
coefficient. The resulting frequency is indicated in the main display.
NOTE: when you change the rate, if a pull coefficient was previously set,
it is removed (‘NO PULL’).
8.3. OUTPUTS 17-24
Multipliers and dividers are available for outputs 17-24. Simply
select the one needed for your application. When x1 is selected,
the selected frequency is unaffected.
