Enoki have been using DMM PC510 by Sanwa for a long time. The PC510 usually measures current which has 0.2% reading accuracy.
Enoki would like to know another high accuracy current DMM.
Looking for DMMs, Enoki found that Sanwa PC7000 is less expensive and accurate.
Otherwise with low coefficient and less than 1Ω resistor, it is possible that a cheap DMM will be able to measure current with high accuracy.
Enoki burnt 630 mA fuse that was peculiar for PC510 and removed it as shown in Photo1 and Photo2.
Enoki exchanged 9V battery on 2021-12-25, which had been used since 2019-11-24.
The dissipated one lasted for 762 days.
Table1 shows Sanwa DMMs current accuracy and the prices.
|Model||Accuracy [%]||Tilt stand||Price [JPY]|
Few DMM tilt stands
Enoki puts PC510 side by side DSO on a self made shelf on desk. It is easy to read a value on LCD with tilt stand.
Should Enoki make a simple stand?
Keysight and GW Instek sell high precision ammeter. But both are expensive.
Table2 shows the accuracy and prices.
|Model||Accuracy [%]||Maker||Price [JPY]|
Enoki would like to measure 1A range. Sanwa PC7000 may be the best choice for Enoki's usage.
Enoki's DMM PC510 high current measurement accuracy is rare even now.
If we can get low temperature coefficient resistor less than 1Ω, usual cheap DMMs may measure current at higher accuracy by measuring the resistor voltage drop.
© enoki.net 2021 December 27