Meinberg TCR180, Руководство пользователя

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7 Functionality of the generator
7.2 Pulse outputs
The pulse generator of the TCR180 generates pulses for the seconds change (P_SEC) and the minute change
(P_MIN). In addition, fixed output frequencies of 10 MHz, 1 MHz and 100 kHz are derived from the OCXO. All
these signals are carried out with TTL level on the back-side connector (VG96).
Three programmable pulses outputs are available (PPO0, PPO1, PPO2). The generator is capable of gen-
erating various pulses, which are configured via the monitor program. The pulse position is invertible for each
channel, the pulse time can be adjusted in the 10 msec grid between 10 msec and 10 sec. By default, the pulse
outputs remain inactive until the receiver has synchronized. The device can also be set in such a way that the
outputs are activated immediately after switching on.
The following modes can be configured independently for each channel:
Timer mode: Three "on" and "off" time pairs per day
Cyclic mode: Periodically repeated pulses.
A cycle time of two seconds would generate a pulse at
0:00:00, 0:00:02, 0:00:04 etc.
DCF77-Simulation
mode:
Outputs simulated DCF77-compüatible time marks,
representing the local time configured on the device.
Single Shot Mode: A single pulse of programmable length is generated once a day at a
programmable point of time.
Per Sec.
Per Min.
Per Hr. modes:
Pulses once per second, minute, or hour aligned with second boundary
Synthesizer Frequency output 1/8 Hz up to 10 MHz
Time Codes Generation of Time Codes as described in chapter "Time Codes"
Idle-mode: The output is inactive
The default configuration for the pulse outputs is:
PPO0: Pulse each second (PPS), active HIGH, pulse duration 200 msec
PPO1: Pulse each minute (PPM), active HIGH, pulse duration 200 msec
PPO2: DCF77 Simulation
Frequency Outputs (optional)
The included synthesizer generates a frequency from 1/8 Hz up to 10 MHz synchronous to the internal timing
frame. The phase of this output can be shifted from -360
◦
to +360
◦
for frequencies less than 10 kHz. Both
frequency and phase can be setup from the front panel or using the serial port COM0. Synthesizer output is
available at the rear connector as sine-wave output (F_SYNTH_SIN), with TTL level (F_SYNTH) and via an
open drain output (F_SYNTH_OD). The open drain output can be used to drive an optocoupler when a low
frequency is generated.
The synthesizer is turned off if a frequency of 0 Hz is configured.
If the output frequency is below 10 kHz the phase of the output signal can be set from -360
◦
to +360
◦
with a
resolution of 0.1
◦
.
TCR180 Date: 4th June 2021 15