Campbell 21X Especificaciones descargar pdf (Pagina 44)

Number 4250-2010

Revision 0.1

Date MAY 1996

Page 25 of 37

4.4.3 Run Mode Timing Checks

VERIFY Verify that the GOES primary channel select switches are set to

GOES "900" and the secondary channel select switches set to "000." If

SWITCHES the switches are not set to these channels, they must be reset prior to

continuing with laboratory testing of the DCP.

RECORD Enter Y to place the DCP in the "RUN" mode.

PARAMETERS

Enter I to display the station ID. Verify that the ID displayed is the

ID programmed into the DCP.

At the top of the minute (using GMT as the reference), enter J to

display the station time. Record GMT and station time. If the

station time differs from GMT by more than 2 seconds, reset the

station time (see Section 4.3, DCP Programming).

Enter S to obtain the time remaining before the next scan. Record

GMT at the time the "S" command was entered and the time

remaining as reported by the DCP. Adding the time remaining to the

recorded GMT should give the next scheduled scan time (normally

set for 30 minutes after the hour).

Enter T to obtain the time remaining before the next transmission.

Record GMT at the time the "T" command was entered and the time

remaining as reported by the DCP. Adding the time remaining to the

recorded GMT should give the next scheduled transmission time

(see Table 4-1 for a list of station IDs and their assigned

transmission times).

4.4.4 Field Testing of the Handar 540A/570A DCP

INSTALL Transport the DCP to field test site and install the unit in the DCP

transmissometer receiver shelter.

CONNECT Connect the on-site trickle charger to the DCP (see Figure 4-2 for

TRICKLE the DCP connector location).

LOCATION

CONNECT Connect the GOES antenna (mounted on the outside of the receiver

ANTENNA shelter and previously aligned) to the DCP RF output connector.

SET GOES Open the DCP case and set the GOES primary channels selection

SWITCHES switches to the channel assigned to the ID of the DCP under test

(see Table 4-1).

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

WATTMETER element) between the "RF Output" connector located on the front

panel of the DCP and the DCP antenna cable.

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Campbell 21X Especificaciones Pagina 44