Campbell 21X Spezifikationen PDF herunterladen (Seite 35)

Number 4250-2010

Revision 0.1

Date MAY 1996

Page 16 of 37

CLEAN INTERIOR Clean the inside of the DCP with compressed air.

OF DCP

MODIFY 570A If this is a Handar 570A DCP, the transmissometer toggle input

TOGGLE INPUT (DCP data channel 02) voltage divider must be modified to ensure

VOLTAGE that the voltage divider always exceeds 3.0 volts when the toggle

DIVIDER input is at a logic "high" level. Modify the toggle input voltage

divider located on the 12-bit A/D Converter (ADC) board using the

following procedures:

• Remove the component platform in socket U17 of the ADC

board (see Figure 4-8 for the location of U17).

• Examine resistor R17-6 located between pins 6 and 11 of the

component platform (the resistor location on the component

platform is shown in Figure 4-8). If the modification has been

implemented, this resistor value will be 4.02K Ohms. If it is not

4.02K, remove the existing resistor (1.00K) and replace it with a

4.02K resistor.

• Replace the component platform in socket U17 of the ADC

board.

MODIFY 570A If this is a Handar 570A DCP, the AT/RH sensor interface circuit

FOR AT/RH on the ADC board must be modified to accept the Rotronics

SENSOR MP100-F AT/RH sensor. To modify the sensor interface circuit,

remove the component platform from socket U7 of the ADC board

(refer to Figure 4-8 for the location of U7).

MODIFY 540A If this is a Handar 540A DCP, the AT/RH sensor interface circuit

FOR AT/RH on the Met board must be modified to accept the Rotronics

SENSOR MP100-F AT/RH sensor. To modify the sensor interface circuit,

remove resistor R8 (see Figure 4-9 for the location of R8).

REINSTALL If this is a Handar 570A DCP, reinstall the ADC board in slot #1.

CIRCUIT

BOARDS If this is a Handar 540A DCP, reinstall the circuit boards in the slots

numbered as follows:

• Slot #6 Met board

• Slot #8 Microprocessor board

• Slot #9 Support board

Replace the circuit board hold-down bracket.

Reconnect the ribbon cables.

Reconnect the DCP internal battery connectors to the battery.

Turn the power switch ON.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 55 56

Keine Kommentare

Campbell 21X Spezifikationen Seite 35