Campbell 21X Spécifications télécharger pdf (Page 27)

Number 4250-2010

Revision 0.1

Date MAY 1996

Page 8 of 37

SWITCH When the "TERM" setup screen (see Figure 4-4) is displayed on

BAUD RATE the computer screen, press F2 to switch to the correct baud rate (300

baud).

CONNECT Connect the serial port of the computer to the DCP programming

COMPUTER port (see Figure 4-2 for location) using the DCP programming

TO DCP cable. After the connection is complete, the "TERM" programming

screen (Figure 4-5) should be displayed on the computer screen.

NOTE If the program is still in memory, the computer display should be

DISPLAY as shown in Figure 4-5.

If the computer display appears as in Figure 4-6, the program

has been lost from memory and the DCP performance and

timing checks should be terminated. Exit the "TERM"

program and turn the DCP off before initiating the servicing

procedures. Be sure and document that the program was no

longer in memory.

SYNCHRONIZE Verify that your watch is synchronized with WWV by calling the

TIME NIST WWV time transmission telephone (303/499-7111).

ENTER Obtain DCP ID and timing information by entering into the DCP

PARAMETERS the boldface character that precedes each of the following

parameters:

• I Station ID

• J DCP time

• S Time remaining before next scan

• T Time remaining before next transmission

RECORD Record each of the values from the ID and timing checks and the

VALUES correct (WWV) time when the DCP time check, [J], was performed.

COMPARE Compare the DCP times to the correct time to determine the timing

TIMES drift relative to previous measurements (at installation or from

recent transmissions - Refer to TI 4300-4000, Data Collection via

DCP (IMPROVE Protocol).

4.1.5 DCP A/D Converter Checks

CONNECT Connect a calibrated voltage source to the input of data channels

VOLTAGE 01, 02, and 03 of the DCP.

SOURCE

CONNECT Connect a calibrated Rotronic AT/RH sensor to the DCP's AT/RH

AT/RH SENSOR input connector.

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Campbell 21X Spécifications Page 27