Follow up on DC Voltage Measurement Accuracy: Measuring DC voltage with high accuracy on a DMM6500 .
I bought a little voltage reference based on Analog Device's AD584 .
The reference is the AD584KH. The kit supports the 4 programmable reference values. It comes with a label showing measurements on a HP 3458A
image source: analog devices datasheet
Calibration values (25° / 49% humidity):
- 2.49974
- 5.00203
- 7.50113
- 10.00277
Calibrated by http://www.haoqielec.com/wap/en/aboutus.html
Checking Keithley DMM6500
I let the reference and DMM warm up for an hour. Room temperature was 26°. Humidity unknown
I used Keithley's TSP script "Measuring DC voltage with high accuracy". I used that in the previous post too.
The Test Script Builder log gives a higher resolution than the 6500 display.
I let the reference settle for 5 minutes on each value before running the script and getting the measurement
| CAL (HP 3458A | DMM6500 | round |
| 2.49974 | 2.4997806153 | 2.49978 |
| 5.00203 | 5.0021082424 | 5.00211 |
| 7.50113 | 7.5012037198 | 7.50120 |
| 10.00277 | 10.002870735 | 10.00287 |
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