Campbell 21X Dokumentacja Pobierz pdf (Strona 45)

Number 4250-2010

Revision 0.1

Date MAY 1996

Page 26 of 37

Set the power element of the wattmeter for the forward direction.

Monitor the wattmeter reading as the first transmit time approaches.

When the transmitter turns on (as indicated by a sharp increase in

the wattmeter reading), note the peak power reading in the forward

direction. Reverse the direction of the power element and note the

peak reading of the reflected power.

The forward direction wattmeter reading should be 10 ± 2 watts.

The reflected power reading should be less than two watts.

Disconnect the wattmeter and reconnect the antenna to the DCP.

Place two fresh desiccant packs inside the DCP. Close the DCP and

tighten all latches to ensure a tight seal.

The transmitted data are reviewed daily, verifying that the transmit

time, frequency deviation, and power level all meet factory

specifications (Refer to TI 4300-4000, Data Collection via DCP

(IMPROVE Protocol)).

If the transmitted data review indicates timing, frequency deviation,

or power related problems, the field test should be terminated and

the DCP returned to the laboratory. The instrument technician will

then coordinate with Handar to arrange for repair and/or

recalibration of the DCP.

If the DCP operates within factory specifications throughout the

seven day test period, the DCP is returned to the laboratory and

turned off until it is needed in the IMPROVE transmissometer

network.

All field test data printouts are archived with the DCP service

records as described in Section 4.5.

4.5 ARCHIVING HANDAR 540A/570A DCP SERVICE RECORDS

Service records for Handar DCPs are maintained by the instrument technician and archived

by DCP serial number in three-ring notebooks located in the ARS instrumentation laboratory.

5.0 REFERENCES

Handar, Inc., 1988, 570A Data Acquisition System Operating and Service Manual, March.

Handar, Inc., 1982, Operating and Service Manual for 540A Multiple Access Data Acquisition

System, 560A Hydrologic Data Collection System, and 545A Programming Set, June.

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Campbell 21X Dokumentacja Strona 45