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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.
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
CKW3/3kg
CKW6/6kg
CKW15L/15kg
CKW30L/30kg
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.
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
CAUTION:
Zero Load
4.3 ± 2.0
1.6 ± 2.0
1.7 ± 2.0
1.3 ± 2.0
NOTE:
4-2
50% Load
Zero + 2.3
Zero + 2.8
Zero + 2.4
Zero + 2.7
CKW Base Series Service Manual
100% Load
Zero + 4.7
Zero + 5.6
Zero + 4.8
Zero + 5.4
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