OHAUS Scout Pro Series, Service Manual

Page: 19 / 40

4-1
CHAPTER 4 TESTING
4.1 TESTING
Before servicing the balance, an operational test and various performance tests should be made to
ascertain whether or not the balance meets specifications. Turn the balance on and allow it warm up
for at least five minutes before performing these tests. Make sure the test area is free from drafts and
that the balance rests on a level and vibration free surface. The masses used for final calibration must
be adjusted to ASTM Class 4 tolerance or better.
4.1.1 Operational Test
1. Connect a functioning AC Adapter to the balance Power Jack located at
the rear of the balance.
2. Plug the AC Adapter into a suitable power source. If the AC Adapter supplied
with the balance is rated for a different voltage, use an appropriate adapter to match the
supply voltage.
4.1.2 Segment Display Test
1. Turn the balance on by pressing ON/ZERO Off , all segments are enabled and displayed
briefly, then followed by a software revision number. See Figure 4-1 for full display.
2. Tare the balance. The display should indicate a zero weight.
Figure 4-1. LCD Full Display.
4.2 PERFORMANCE TESTS
Accurate performance of a Scout Pro balance is determined by a series of three performance tests. The
displayed readings are compared with the tolerances listed in Table 4-1. Tolerance values are
expressed in counts. A one count change is equal to the last digit shown on the balance display.
TABLE 4-1. TYPES OF PERFORMANCE TESTS
PERFORMANCE TEST TOLERANCE
Repeatability +1 Count
Off Center Load +2 Count
Linearity +1 Count
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