OHAUS Pioneer PA64, Service Manual

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CHAPTER 4 TESTING
Pioneer
™ Balances Service Manual
4-7 Ohaus Corporation www.ohaus.com
4.4.6 Repeatability Test
Repeatability is the Standard Deviation of a set of similar weight readings.
Requirements:
– To perform this test a single mass must be used for all readings.
– The test mass should be approximately ½ of the capacity of the instrument.
– Wear gloves when handling the mass.
Before starting a repeatability test, set up the instrument as follows:
Set Up:
Enter the menu and adjust and record the following settings:
A. Set the Filter level to medium or the center of its range.
B. Set the AZT (Auto Zero Tracking) to .5d or its lowest setting. Do not turn it off.
C. Set the instrument to display the same units as the performance specifications.
(Usually kg, g, or mg)
Record Settings:
Filter Level Setting = ____________
Auto Zero Tracking Setting = ____________
Displayed Units = ____________
Mass Used = ____________
TEST PROCEDURE:
1. Zero the instrument, if it does not read zero.
2. Using a test mass approximately half the capacity of the instrument, place the mass on
the center of platform. Record the reading on the worksheet provided.
3. Remove the mass from the platform.
4. Repeat this test starting at Step 1 until you record a total of ten readings
Fill in the worksheet (Table 4-4) with the ten (10) readings .