12 Attachment: Technical Information
Holdover Mode
Automatic switching
to crystal time base
accuracy approximately 1E-8
if decoder has been synchronous for more than 1h
Backup Battery
If the power supply fails, an onboard realtime clock keeps time and date information important system
parameters are stored in the RAM of the system lifetime of the Lithium battery at least 10 years
Generator Outputs
Modulated output:
unbalanced sine carrier, 1 kHz
3 V
PP
(MARK), 1 V
PP
(SPACE) into 50
Ω
unmodulated outputs(DCLS):
TTL into 50
Ω
, RS-422
Pulse Outputs
Four programmable outputs, TTL level
Default settings: active only ’if sync’
PPO_0 - PPO_3:
Idle (not active)
Timer
Single Shot
Pulse Per Second, Per Minute, Per Hour (PPS, PPM, PPH)
DCF77 Marks
Time Sync
DCLS Time Code
Synthesizer Frequency
Accuracy of Pulses
Better than
±
1
µ
sec after synchronization and 20 minutes of operation
Serial Port
Configurable RS-232 interface
Baudrates:
300 Bd...115200 Bd
Framing:
7E2, 8N1, 8N2, 8E1, 7N2, 7E1, 801
Mode of operation:
string per second
string per minute
string on request
Time telegram:
Meinberg Standard, Uni Erlangen, SAT, Meinberg Capture,
ION, Computime, SPA, RACAL
Capture Inputs
Triggered by falling TTL slope
Pulse repetition time:
1.5 msec min.
Resolution:
800 nsec
IMS-M4000
Date: 21st August 2019
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