A good electronics laboratory needs references.A good home laboratory needs cheap but “good enough” references. I needed a voltage reference, and found out cheap kit: 3pcs AD584 4 Channel 2.5V / 5V / 7.5V / 10V High Precision Voltage Reference Module costs less than 10 Euros. This device is AD584 based 2.5V / 5V / 7.5V / 10V high precision voltage reference module. It can be configured to output any of those voltages by moving a jumper. This is one of those cheap AD584 based voltage references:
The AD584 is an 8-terminal precision voltage reference offering pin programmable selection of four popular output voltages: 10.000 V, 7.500 V, 5.000 V and 2.500 V. The input voltage can vary between 4.5 V and 30 V. The input voltage needs to be higher than the output voltage setting (at least 1.5V higher), so I decided to test the device with 12V DC input voltage that is enough for all voltage settings.
Results when I powered the device from 12V dc power source show that the device seems to be pretty accurately match my most accurate multi-meter:
I got three devices. Two were this accurate, third was a little bit more off, but still very accurate:
Very accurate! I this this3pcs AD584 4 Channel 2.5V / 5V / 7.5V / 10V High Precision Voltage Reference Module kit is well worth of the small price paid. Next task is to mount them to some suitable case.
Addition: Measurement with more accurate meter those that showed accurately 10V (+-1mV) on multi-meter.