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121GW: Shunt Resistors used in Current Measurements
JDW:
Sorry, I couldn't correct my error before your reply. In my previous post, I mean to say: When I switch the Dial to "µA/µVA"...
When I followed your instructions, I am now able to see "x0.000 mA" or "0.0000mA" on the LCD. (x = blank space instead of digit on LCD.) Thank you!
More specifically, I did this:
1. Put Red probe into "A/500mA" (Black probe is in COM) (neither Probe connected to anything)
2. Set Dial to "A/mA" — LCD shows: AUTO DC xx0.00 mA (500mA range)
3. Pressed RANGE button 1 time — LCD shows: DC xx0.00 mA (500mA range)
4. Disconnected Red probe — LCD shows: DC xx0.00 mA (no change)
5. Inserted Red probe into mA/µA — LCD shows: AUTO DC 0.0000 mA (5mA range)
6. Pressing RANGE 1 time — LCD shows: DC 0.0000 mA (5mA range)
7. Pressing RANGE a 2nd time — LCD shows: DC x0.000 mA (50mA range)
8. Pressing RANGE a 3rd time — LCD shows: AUTO DC 0.0000 mA (5mA range again)
9. Switching Dial to µA/µVA — LCD shows: AUTO DC x0.000 µA (50µA range)
10. Pressing RANGE 1 time — LCD shows: DC x0.000 µA (50µA range)
11. Pressing RANGE 2nd time — LCD shows: DC xx0.00 µA (500µA range)
12. Pressing RANGE 3rd time — LCD shows: DC x0.000 µA (50µA range again)
In other words, when you have the 2 probes disconnected (not actively measuring current), the only way to get "x0.000 mA" (50mA range) or "0.0000mA" (5mA range) to display on the LCD is to start off with the RED probe attached to "A/500mA" and switch the Dial to "A/mA" and then pull out the Red probe and attach it to "mA/µA".
J-R:
No, you don't need to start with the test lead in the A/500mA jack. Just simply connect it to the mA/uA jack and set the selector to A/mA. And which you do first doesn't matter.
JDW:
--- Quote from: J-R on February 23, 2023, 05:44:38 pm ---No, you don't need to start with the test lead in the A/500mA jack. Just simply connect it to the mA/uA jack and set the selector to A/mA. And which you do first doesn't matter.
--- End quote ---
Thank you very much! I just confirmed that on my meter and updated the chart in the attachment below.
J-R:
To clarify, the column for "Presses of "RANGE" btn" in your chart is not going to be accurate because the number will depend on the range that the DMM has auto-ranged to at the instant you press the Range button. As I mentioned previously, the first press of the Range button simply takes the DMM out of auto-range, but it stays in the same range that auto-range had selected.
JDW:
--- Quote from: J-R on February 23, 2023, 10:16:30 pm ---To clarify, the column for "Presses of "RANGE" btn" in your chart is not going to be accurate because the number will depend on the range that the DMM has auto-ranged to at the instant you press the Range button. As I mentioned previously, the first press of the Range button simply takes the DMM out of auto-range, but it stays in the same range that auto-range had selected.
--- End quote ---
I apologize for not having clarified that my chart is going on the assumption that the two probes are connected but attached to nothing. If both probes are disconnected, then what is written in the attachment I created is absolutely correct because it will not have auto-ranged to anything other than the default range.
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