Hach 3650 manual Troubleshooting, Serial Test, Keyboard Test

6.2 Troubleshooting

If your analyzer is behaving strangely (failing to calibrate, giving inappropriate measurement values, etc.) and you have attempted to rectify the problem by servicing the sensor (for instructions, see the accompanying EC Sensors - Maintenance & Installation Manual) to no avail, you may wish to use the Troubleshooting menu to make sure that the instrument is configured correctly for your application, and is in good working order.

The instrument must be connected to your PC and placed in measurement mode to perform these tests.

6.2.1 Serial Test

Normally, the instrument will inform you of a disconnected RS-232 (serial) link when appropriate. However, you can confirm a good connection using the Troubleshooting, Serial Link Test by echoing a test message via the instrument.

Enter text characters in the Text to be sent box, then click Send. If the serial link is operating correctly, the exact same text will be displayed back from the instrument in the Echo box. Choose Cancel to exit from this test box.

Fig 6-1: Serial Link Test

6.2.2 Keyboard Test

The Troubleshooting, Keyboard Test will reveal whether all the analyzer buttons are functioning correctly. The box illustrated in Fig 6-2appears.

Press any one of the instrument's buttons (except the on/off button) for a full second or more. The appropriate square on-screen should darken (as illustrated for the Down Arrow button). Choose Cancel to exit from this test box.

Fig 6-2: Keyboard Test