OHAUS T32ME, Руководство по обслуживанию

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CHAPTER 4 TESTING
3000 Series T32ME & MC Indicators Service Manual 4-1 Ohaus Corporation www.ohaus.com
4.1 TESTING
Before and after servicing the Indicator, operational and performance tests should be made to
determine if it meets specifications. Turn the Indicator ON and allow it to warm up for at least 10
minutes before performing these checks. The masses used for calibration should be ASTM
Class 4 or OIML F2 tolerance or better.
NOTE:
Make sure the test area is free from drafts and that the base rests on a level and
vibration-free surface.
4.2 Power Test
The purpose of this test is to determine if the electronic circuitry of the Indicator is functioning
properly. In some cases, the AC Adapter or line cord supplied with the Indicator may have
become defective.
1. First be sure the AC Adapter is functioning properly, then connect it to the Indicator
power plug.
2.
Plug the AC Adapter or power cord into a suitable power source.
3. With the Indicator connected to an appropriate power supply, press the ON/ZERO Off
button. The Indicator performs a self-test, indicates the software revision and then goes
into weighing mode.
4.
If all of the displays appear normal in this test, continue with the next test. If the display
did not appear, check the AC adapter output and repeat the test with a good adapter. If
the display was erratic, the PC board is defective and requires replacement.
4.3 Performance Tests Using a Scale Base
These tests are performed on the Indicator using a known good scale base and test mass.
At this point, the Indicator has been checked for full display, menu setup and calibrated.
If a Load Cell Simulator is being used, proceed to paragraph 4.4.
4.3.1 Overload/Underload Test
This test determines if the Indicator displays the proper indication when an underload or
overload condition exists on the scale base.
1. With the Indicator ON and no mass on the scale base, lift up on the scale base
platform and observe the display. The display should indicate Error 8.4. Release the
platform. The display should return to zero.
Note: Do not exceed Load Cell capacity when testing the Indicator.
2. Place a mass on the scale base platform which slightly exceeds the capacity of the
scale base, and observe the Indicator display. The display should indicate Error 8.3.
Remove the mass from the scale base. The display should return to zero.