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Analog Load Cell Testing Procedure

1. Power off mode: Using an digital ohm / volt   meter, measure the following resistance's on the load cell cable.
A. + Excitation and - Excitation & Input Should be slightly higher than output
B. + Signal and  - Signal Output
C.+ Excitation and + Signal
D.+ Excitation and - Signal
E.- Excitation and + Signal
F.- Excitation and - Signal
The input and output resistance should match the manufacturer's specs. The other resistance readings should all be the same and approximately 75% of the input or output resistance's.
2. Using an ohm meter, measure the following resistance's.
A. All leads to case.
B. All lead to shield.
The resistance should be greater than 5,000 ohms. If  it is less, there is a chance for signal loss or voltage loss due to leakage to ground, etc.
3. Power on mode: Using an digital ohm / volt meter, measure the following voltage outputs on the load cell cable Signal Leads. Note: Max output will depend on Excitation voltage and mV per Volt of load cell. This test 15 volts Excitation and 3 mV per Volt. Sometimes you can only get and accurate reading by disconnecting the signal lead and taking your measurement.
A. Measure Excitation voltage. Make sure it meets factory specs for indicator and load cell.
B. Unloaded:  Depends on dead load of scale. Should be close to 1 mV to 5mV, but can be more.
 
C. With load:  at 3 or 4 test loads. Max load (full scale for 3mV per Volt load cells with 15 V excitation voltage) 45mV. If over you have a problem.
• (full scale for 2mV per Volt load cells with 15 V excitation voltage) 30mV. If over you have a problem.
• (full scale for 2mV per Volt load cells with 10 V excitation voltage) 20mV. If over you have a problem.
• (full scale for 2mV per Volt load cells with 5 V excitation voltage) 10mV. If over you have a problem.
 

For meter isolation test, you will have to use a load cell simulator.

 

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