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Thank you for the helps i have recieved from this group. I have this problem: My sensors chamber unit have an external switch controling the solenoid valves which i must depress before i start data acquisition. I now want this switch to send a signal to start the LabView program itself to start, and to stop data aquisition after a timed interval. My program VI is attached. My intention is to use the loop on the left to recognise the arrival of the signal/ pulse from the switch, finish execution, pass control to the loop on the right.

Thank you for that information. So how do i prevent this other channels' 'float' around the values of adjacent channel(s) ?.

I guess that too. Today i tried what i got from the SCB 68 manuals for differial input. I connected a small 9V battery and place a 100ohms resistor acros a specified place on the PCB of the SCB 68. It was able to record the voltage as expected. However all the channels indicted values close to 9.1 V. I expect only the channel with the battery to record this.

I am working on a sensor array- 6 sensors. I have connected the array through amp circuitry to SCB 68 box. I expect the MAX to give readings of sensor values. All i got was a noisy waveform on the MAX display. i used a multimeter to measure sensor outputs and detected an average of 1.5- 2 V, that was before a gain 2 amplification. The readings on the sensor seem not to affect the reading of MAX test, as same reading continues after signals were disconnected. What result should a MAX test panel give? Mine showed some continuously varying value until it stopped at around 10.8 V. I have just got DIAGNOSTIC Tool 2.0 to test the board and it indicated all is well: all PASSES. What then may be wrong ?