Electronics > Metrology

Hioki DM7276-01 Precision DC Voltmeter (9 PPM)

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aronake:
The voltage reference board read BT4560 in the corner, indicating that it is the same voltage reference board as in BATTERY IMPEDANCE METER BT4560:

https://www.hioki.com/in-en/products/resistance-meters/battery/id_5897

There are sellers on Taobao who claim to have ADR1000 for sale.

https://item.taobao.com/item.htm?abbucket=5&id=761537983785&ns=1&spm=a21n57.1.0.0.5256523cWu7jic

They are on very similar voltage reference boards with an ADR1000 but read DM7275. So it looks like ADR1000 may be used in newer models, and as has been indicated that Linear is now selling it for companies using it in products.

gamalot:
They chose OPA2140 on their LTZ1000 board.

gamalot:
Sorry to go off topic again, are these resistor values 1.58K? I have never seen such top marking before.  :-//

Lajt:
If anyone is interested, I've made a DIY temperature probe for Hioki DM7275, DM7276 & RM3544.
The build is documented on https://lajtronix.eu/2024/02/21/diy-hioki-dm7275-76-temp-probe-z2001/
It has been tested and is working great.

Br, Lajt

laichh:

--- Quote from: gamalot on January 22, 2024, 04:05:04 am ---Sorry to go off topic again, are these resistor values 1.58K? I have never seen such top marking before.  :-//

--- End quote ---

1.58 kohm is correct, these resistors are likely made by KOA.

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