CHAPTER 4 TESTING
4.4 Consistency
Check
To check the system prior to installation, make the following measurements. (Also make these
checks if the Load Cell will not calibrate, or if the Indicator does not read correctly, or is giving
unstable readings.)
1. Using a voltmeter, measure and record the excitation voltage supplied by the Indicator.
Most Ohaus indicators supply 5 volts dc for the excitation voltage.
2. Using an mV meter, measure and record the signal voltage with no load on the base.
CAUTION:
IN THE NEXT STEP, DO NOT OVERLOAD THE BASE BEYOND FULL
CAPACITY RATING.
3. Using an mV meter, measure and record the signal voltage at the loads shown in
Table 4-2.
4. Compare the measured output readings with the theoretical values from the Load Cell
data. (See Table 4-2.)
TABLE 4-2. LOAD CELL OUTPUT READINGS (in mV with 5V Excitation)
Model/Capacity
Zero Load
50% Load
100% Load
CKW3/3kg
4.3 ± 2.0
Zero + 2.3
Zero + 4.7
CKW6/6kg
1.6 ± 2.0
Zero + 2.8
Zero + 5.6
CKW15L/15kg
1.7 ± 2.0
Zero + 2.4
Zero + 4.8
CKW30L/30kg
1.3 ± 2.0
Zero + 2.7
Zero + 5.4
4.5 Performance Tests
Accurate performance of the CKW Bases is determined by two performance tests. The
displayed readings are compared with the tolerances listed in Table 1-1.
NOTE:
The following performance tests are used to evaluate base operation before and
after repairs. The base must meet the requirements specified in each test as
well as the specifications listed in Table 1-2. Before proceeding with the
following tests, the base should be calibrated. (See Section 4.3.)
Ohaus Corporation www.ohaus.com
4-2
CKW Base Series Service Manual
Summary of Contents for CKW3R
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Page 6: ...TABLE OF CONTENTS CKW Base Series Scales Service Manual ii Ohaus Corporation www ohaus com...
Page 12: ...CHAPTER 1 INTRODUCTION Ohaus Corporation www ohaus com 1 6 CKW Base Series Service Manual...
Page 14: ...CHAPTER 2 DIAGNOSTIC GUIDE Ohaus Corporation www ohaus com 2 2 CKW Base Series Service Manual...
Page 22: ...CHAPTER 4 TESTING Ohaus Corporation www ohaus com 4 6 CKW Base Series Service Manual...
Page 28: ...APPENDIX A GLOSSARY Ohaus Corporation www ohaus com A 2 CKW Base Series Service Manual...
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Page 30: ...80252592 P N 80252592 SERVICE MANUAL CKW BASES...
