R T M 3 2 0 5 U s e r M a n u a l
16
C H A P T E R T W O
Connecting Instruments
to the RTM3205
SMA jacks provide the means of connecting your equipment to the RTM3205. The RTM3205 can
provide up to four optional outputs. Options are:
Digital outputs (PPO, 1PPS, 10MPPS, DC time code, DDS)
Amplitude-modulated (AM) time code
Open-collector alarm
10 MHz low-phase-noise
The AM time code and the digital outputs are capable of driving properly terminated coaxial cables.
These signals are DC-coupled and sourced from Advanced CMOS (ACMOS) drivers which are able
to maintain output TTL levels into a 50-ohm load.
The low-phase noise, spectrally pure sine wave outputs are capable of driving 1 Vrms into a 50-ohm
load. Care should be taken not to short circuit these outputs or to connect them to other voltage
sources.
If your unit is equipped with the optional Alarm Output, it will be available on an SMA jack labeled
“ALARM”. Care should be taken not to directly connect this open-collector output to a voltage
source. A series current-limiting resistor of at least 1k ohms in value should be used. The pull-up
voltage must not exceed 40V.
Refer to
Chapter 10 - Inputs/Outputs
and to
Appendix K - Specifications
for more information on
the optional output signals.
Summary of Contents for RTM3205
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