Campbell 21X Especificaciones descargar pdf (Pagina 32)

Number 4250-2010

Revision 0.1

Date MAY 1996

Page 13 of 37

COMPARE The DCP data channel 04 reading (Rotronics AT output signal)

READINGS must be adjusted by subtracting 100 from the reading obtained

during the test. Compare this adjusted reading with the temperature

measurement obtained with the hand held sensor. The two values

should then match within ± 2 F

°

.

Compare the DCP data channel 05 reading (Rotronics RH output

signal) with the RH measurement obtained with the hand held

sensor. The two values should agree within ± 3%.

Compare the DCP data channel 10 reading (DCP internal battery

voltage) with the internal battery voltage measured during the DCP

internal physical inspection. The two values should agree within ±

0.005 volts.

4.1.6 Transmission Test

CONNECT Connect an RF wattmeter (with a 200-500 mHz, 25-watt power

WATTMETER element) to the "RF Output" connector located on the front panel of

the DCP. A 50 Ohm, 25-watt load resistor should be connected to

the output of the wattmeter.

SET CHANNEL Set the GOES primary channel select switches to the channel

SWITCHES number assigned to the ID programmed for the DCP under test.

INITIATE With the DCP in "PROGRAM" mode, initiate a transmission by

TRANSMISSION entering #.

RECORD The wattmeter should read 10 ± 2 watts. Record the observed

READING reading on the Post-Field Inspection Checklist - Handar 540A/570A

DCP (Figure 4-1).

RESET Reset the GOES primary channel select switches to 900.

SWITCHES

4.2 ROUTINE LABORATORY SERVICING

Record and document all information and procedures on the Routine Servicing Checklist -

Handar 540A/570A DCP (Figure 4-7).

RECORD Record the DCP serial number, the site it was received from, and

GENERAL the date it was received. The initials of the technician performing

INFORMATION the inspection should also be recorded.

IDENTIFY Identify the DCP model (Figure 4-2 shows the front panel layout

DCP MODEL of each of the three DCP models used by ARS).

NOTE REASON Note whether the DCP was returned for annual servicing (no

FOR RETURN observed operational problems in the field) or for unscheduled

maintenance (unit malfunctioning). If returned for unscheduled

maintenance, describe the observed field symptoms.

Campbell 21X Especificaciones Pagina 32