MODEL 1801 MOISTURE ANALYSER PCB

1	INTRODUCTION This Test Procedure is specific to the Model 1801 printed circuit board. Work must be carried out in the order given and, at each stage, results entered on the Test Data Sheet.

2	DRAWINGS AND SPECIFICATIONS

DRAWING	DRAWING No. Wiring Diagram	900-1801-00518 Circuit Diagrams	900-1801-00520-01

Form 119	Specific or Generic Specification Sheet 009-1-01-T	Test Certificate 009-1-01-R	Test Data Sheet

3	EQUIPMENT REQUIRED The tests should be carried out using the equipment listed below. The actual types of equipment specified are not mandatory i.e. controlled, purpose-made, test equipment may be used but use of any alternative equipment should be agreed beforehand with the Responsible Engineer.

Item	Qty	Title

1	1	Digital Multimeter, Voltage and current accuracy +/- 0.1% 2	1	Test Jig, serial number 00-0102-18

4	GENERAL DESCRIPTION The object of this test procedure is to demonstrate and record that the PCB's conform to the customers requirements as stated in the Analyser Specification Sheet for the job.

5	INSPECTION If, at any point, the PCB fails to meet inspection criteria and is not rectifiable by the Test Engineer a non-conformance report is to be completed with details of the fault. The equipment is then to be segregated and identified with a "Rejected" label. On completion of the rectification work, testing is to be recommenced at a proper stage in the Test Procedure as specified by the relevant engineer.

5.1	Mechanical Carry out a visual inspection of the PCB for build standard and check against the BOM that all necessary components have been fitted.

6	FUNCTIONAL TESTING

6.1	Procedure a) Place the PCB to be tested on the jig and plug in all the connectors EXCEPT THE DISPLAY CONNECTOR 'CON3' and switch on the power. Connect a DMM to Con 3/6 (+) and Con 3/10 (-). Check that the voltage present is between 4.9V and 5.1 Vdc. If correct, switch off, plug in the display and switch on again.

b) Connect the DMM to the left hand side of R6 and the bottom of D5. Set the voltage to 13.5Vdc     (+/- 0.1V) using R4 (CV);

c) Connect the DMM to the right hand side of R6 and the left hand side of R10. Set the voltage to   11.0Vdc (+/- 0.1V) using R11 (POSV);

d) Set the toggle switch to the ZERO position and press the PPM push-button. The LED display      should read near zero. The indicated value should be between -0016 (min.) and +0016 (max.).

e) Connect a DMM to Con1/1 and Con1/2 (mV) and adjust the reading to flash between 0.0mV and   and 0.1mV using R41 (ZERO)

f) Connect the DMM to the output of the Test Jig to read mA. Adjust the test potentiometers               on the Test Jig to obtain a DMM reading of 13.2 mA. Adjust R27 (off board) to obtain a 	               display indication of 820.0 (PPM by Wt.);            Note : The next set of instructions are relavent to the calibrated output of the instrument and not the             Full range of the instrument. Refer to the specification sheet before following the instructions.

g) Adjust the test potentiometers on the Test Jig to give a display value of 600.0 Now adjust R34 (SPAN2) to give a DMM reading of between 40.0 and 40.1 mV;

h) Push the OUT push-button and check that the display value is 40.0 +/- 2%.

i) Set the toggle switch to the ZERO position and press the PPM push-button. The LED display     should read near zero and the DMM across Con1 should read 0.0mV.

j) Push the OUT push-button and check that the display value is 0.0 +/- 2%.

Repeat steps g) to j) until the instrument output has been calibrated to the specified range.

k) Push the SET1 push-button and check that the display value can be adjusted from near zero to greater than 800.0 using R47 (off board), Check that the ALARM 1 relay and the ALARM 1 indicator operate near 600.0 PPM;

l) Push the SET2 push-button and check that the display value can be adjusted from near zero to greater than 800.0 using R63 (off board), Check that the ALARM 2 relay and the ALARM 2 indicator operate near 600.0 PPM;

m) 	Using the potentiometers on the Test Jig check the function of the board over 20% intervals and note the results for displayed ppm readings against board output on the table provided.

7	FINAL INSPECTION

Disconnect the PCB, Re-inspect the PCB to check that imperfections have not been introduced during the test procedure.

Learn more on Moisture Analyser or Wobbe index calorimeter.