Consistency Check; Load Cell Output Readings - OHAUS Defender D30BR Service Manual

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
D30BR/30kg
D60BR/60kg
D60BL/60kg
D150BL/150kg
D150BX/150kg
D300BX/300kg
D30VR/30kg
D60VR/60kg
D60VL/60kg
D150VL/150kg
D150VX/150kg
D300VX /300kg
Ohaus Corporation www.ohaus.com
CAUTION:
Zero Load
1.3 ± 1.0
1.1 ± 1.0
1.1 ± 1.0
1.3 ± 2.0
1.3 ± 2.0
0.24 ± 2.0
1.3 ± 1.0
1.1 ± 1.0
1.1 ± 1.0
1.3 ± 2.0
1.3 ± 2.0
0.24 ± 2.0
4-2
50% Load
Zero + 2.8
Zero + 2.55
Zero + 2.55
Zero + 2.7
Zero + 2.7
Zero + 3
Zero + 2.8
Zero + 2.55
Zero + 2.55
Zero + 2.7
Zero + 2.7
Zero + 3
Defender™ B & V Series Service Manual
100% Load
Zero + 5.6
Zero + 5.1
Zero + 5.1
Zero + 5.4
Zero + 5.4
Zero + 6
Zero + 5.6
Zero + 5.1
Zero + 5.1
Zero + 5.4
Zero + 5.4
Zero + 6