The meter is reading 1 or -1. What is going wrong?
A2. There are three possible causes: 1. The most likely cause is that the meter is being used with its inputs beyond their operating range. Check the product data sheet and make sure that the inputs are well within the power supply rails. A good practical test for this on a non ‘S-type’ LCD meter is to replace the power supply with an isolated 9V battery. If this works, it suggests that your existing power supply is causing the meter’s input to exceed the common mode input range. Remember that only an ‘S-type’ meter can have its inputs referred to the same supply as the meter. 2. The meter’s voltage reference has not been connected. This will depend on the meter in question, but check the application notes on the back of the product data sheet, especially the required link connections. 3. The input voltage is too large!
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