About Us
DMMCheckPlus.com
Originally known as "voltagestandard.com", this website was created to continue the production and sale of the voltage standard calibration reference, DMMCheck Plus.
5VDC and 5VAC RMS Voltage Reference
The 5V reference voltage is based on the Linear Technology LT1021BCN8-5 buried Zener reference IC. After "aging", the trim potentiometer is carefully adjusted for a reference output of 5.0000V as measured by our calibrated 8.5 digit Keysight 3458A DMM that has an accuracy of 0.0008%. A 0.1% accurate, 5.00VAC RMS, square wave 100Hz voltage source is used to check the AC voltage accuracy of your DMM. The signal is true AC (bi-polar), not pulsed DC. It can also be used to check the compensation of oscilloscope probes.
Precision Focused
100Ω, 1KΩ, 10KΩ, and 100KΩ 0.1%, 10ppm/⁰C resistors (Vishay type PTF56), connected in series are available to check the resistance function of your DMM. Depending on how you connect your meter leads many different resistance values are available. The resistors are guaranteed accurate within 0.1% of their stated values, but the actual value obtained with a 4-wire (Kelvin) measurement using our HP 3458A (.001% accuracy on OHMS) is provided on the as-measured record.