DCD-24 User Manual (rev 1.00)
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DCD-24 User Manual (rev 1.00)
5.2. PARAMETERS LED’S
The 3 groups of LED’s left of the display indicate parameters:
- REFERENCE
The first column of led’s indicates the selected reference:
• Internal
• External
• VSO
If External has been selected, the second column of led’s indicates which
external, out of four choices:
• WC
• AES (AES-3id unbalanced)
• 10Mhz (GPS or Rubidium Clock)
• Video Sync (SD & HD).
If VSO has been selected, the second column has an ADJUST led indicating
you are currently adjusting the amount of VSO.
- OUTPUT WC RATE
Two different options are available:
• FOLLOW INPUT
• SET
The first column of LED’s indicates the option currently selected. FOLLOW
INPUT is only available when the reference is WC or AES.
With SET selected, the next two columns indicate the rate selected and the
pull coefficient(s). All standard rates are available and standard ‘pull’ coef
-
ficients. These coefficients can be combined to 4.27% and -4.096%.
- OUTPUTS 17-24
Multipliers (and dividers) are available for outputs 17-24. This means that,
if the output rate is set to 48K and x4 is selected, the frequency on outputs
17-24 will be 192K. Note that only the main frequency (48K in this case) will
be shown on the display
.
5.3. STATUS LED’S
The 3 groups of LED’s right of the display indicate status:
- STATUS
• Locked: The DCD-24 PLL has achieved lock
• Holding: The reference failed and the PLL is holding the last known frequency
• Gearboxing: The generated frequency is different than the reference
For example:
gen
: 96K & REF: 44.1K or GEN: 48.048K & REF: 48K
• Ethernet: The DCD-24 is connected to a network via the Ethernet port.
- WARNINGS
• Ref Error: When an error occurs with the reference signal, this LED flashes.
To clear, press any key.
• Ref Off Speed: The reference is detected to be off speed by more than
1.5%.
• Ref Missing: LED comes on when no valid signal is present at the
Reference Input connector
• Termination: One of the outputs is improperly terminated. See 5.1 above
for more information.
- POWER
When the DCD-24 is on, the Power A and Power B LED’s indicate that power
is present at the corresponding connector. When the DCD-24 is turned off,
these LED’s stay off, even with power present at the connector.
Only one power supply is required to operate the DCD-24. The second input
is provided for redundancy. If two supplies are connected to the DCD-24 and
one fails, the corresponding LED flashes until the faulty supply is replaced.
When using a single power supply, either input can be used
.
5.4. FRONT PANEL LOCK OUT SWITCH
When the front panel lockout switch is on, all switches except the [
view
] switch
are inactive (i.e. you can still check the input rate).
Note:
To reset a Ref Error, you must first ‘unlock’ the front panel.
6. Navigation Keys
6.1. SET UP KEY
The Set Up mode is used to change param
-
eters. To enter the Set Up mode, press the
[SET UP] key.
While in Set Up mode, the SET UP LED is on.
To exit the Set Up mode, simply press the [SET UP] key again.
6.2. UP, DOWN, LEFT, RIGHT KEYS
These keys are directly left of the [VIEW] and [SET UP] keys. They are not
labeled as such because their function is fairly obvious.
While in Set Up mode, the [UP] and [DOWN] keys are used to change the
value of the selected menu, while the [LEFT] and [RIGHT] keys are used to move
to a different menu.
