Model: MTS200 (1U)
Doc. Ref. no. : m08/om/201
Issue no. : 03
User’s Manual
Page 28 of 195
Page 28 of 195
6.1.3
Verifying Antenna and Cable Operation
WARNING
Please ensure that while doing below mentioned procedure for checking
antenna voltage/current while unit is in POWER ON condition, do not
short
the antenna supply +5 Vdc and GND, in any case, failure of which will
damage the unit internal electrical supply.
This equipment is sensitive to Electrostatic Discharge (ESD). Observe all
ESD safeguards while using this equipment. Otherwise, there is danger that
the unit may get damaged through ESD.
6.1.3.1
Checking the Antenna Voltage
mas
TER
T-Sync
Model MTS200 unit provides +5 Vdc to the GPS antenna though its Antenna
connector on unit rear panel, which is carried through the antenna cable. Nominal antenna current is
10 mA. Check the voltage at the antenna connector on the unit rear panel antenna connector.
Without the +5Vdc supply on antenna connector of unit, the antenna and
mas
TER
T-Sync
Model
MTS200 will not synchronize with the GPS satellites signal and can generate an GPS UNLOCK
alarm.
6.1.3.2
Power Supply Check
The Antenna Voltage test (mentioned above in section6.1.3.1) actually tests the main power supply
voltage for all models of
mas
TER
T-Sync
Model MTS200
‟s. This voltage should be between 4.9 and
5.1 Vdc.
6.1.3.3
Checking the Antenna Resistance
Checking the internal resistance of the GPS antenna is not as useful as verifying the antenna current
mentioned above in section 6.1.3.1. Antenna resistance measures several megohms with Multi-meter
probes at one polarity and less so if you change the Multi-meter probe polarity.
6.1.4
Antenna Surge Suppressor
If GPS Surge Suppressor kit is available with purchase order, user should mount it in line with the
antenna cable. Additional information on grounding GPS antennas, and grounding in general, are
available from masibus Customer Support division (Kit P/N :m-LA-01).
