MDS EL705 OEM Series Spezifikationen PDF herunterladen (Seite 36)

28 OEM Series™ I/O Guide MDS 05-3624A01, Rev. B

6.2 Bench Testing Setup

Figure 13 shows a sample test setup that can be used to verify the basic

operation of transceivers in a shop setting. The test can be performed

with any number of remote radios by using a power divider with the

required number of output connections.

The RTU simulator (MDS Part No. 03-2094A01) is a microcontroller

that emulates a remote terminal unit operating at 1200, 2400, 4800, or

9600 bps. Custom software is supplied with the RTU simulator that

allows continuous polling of remote radios using an IBM-compatible

personal computer. The software reports the number of polls sent, polls

received, and the number of errors detected.

NOTE: It is very important to use attenuation between all units in the

test setup. The amount of attenuation required depends on the

number of units being tested and the desired signal strength

(RSSI) at each transceiver during the test.

A maximum level of -50 dBm is recommended at each

transceiver, because the radio’s RSSI reporting will not be

accurate above this level. In no case should a signal stronger

than +10 dBm be applied to any transceiver in the test setup,

or damage may result.

Invisible place holder

Figure 13. Typical setup for bench testing of radios

6.3 Helical Filter Adjustment

If the operating frequency of the radio is changed more than 5 MHz, the

helical filters should be adjusted for maximum received signal strength

(RSSI). If adjustment is required, follow these steps:

MASTER STATION

COMPUTER RUNNING MDS

POLL.EXE PROGRAM

REMOTE

RADIO

REMOTE

RADIO

REMOTE

RADIO

REMOTE

RADIO

NON-RADIATING ATTENUATOR

• Install on any unused divider ports

• 2W minimum rating

POWER DIVIDER

POWER ATTENUATORS

• Fixed or adjustable

• 2W minimum rating

RTU SIMULATORS

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