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This might be a pretty silly question, but it has been bothering me for one week. I have never used DMM before, and the connections for potentiostat are very easy. I know that I should not connect the amperemeter in parallel, but that is the connection for potentiostat or the other channels. If I can get some help on the correct connection of 7700 for current measurement, I would be very grateful!
- Keithley Applications
- Posts: 2847
- Joined: June 10th, 2010, 6:22 am
- Country: United States
Take a look at channels 21 and 22.
They are normally shorted(HI to LO). This keeps the current flowing.
When you want to read the current close(energize) one of the channels. Now the current flows into the shunt in the DMM to make the current measurement.
In the circuit you want to measure current, you must "break" the current path and insert the Channel 21 HI to one side of the path and channel 21 LO to the other side of the path. Basically you insert channel 21 into the current path.
That should do it.
Another method is to use channels 1 through 20 but use a shunt resistor.
Break the current path as before and connect the channel HI and LO to the break. But place a shunt resistor across the HI and LO.
Example if you expect 1mA current then use a 1k ohm resistor. Then measure voltage.
You know the resistance, you measure the voltage you can calculate the current.
Also you could use the MX +B Math function to calculate the current for you.
Example... Set M to 0.001 and B to 0.0
Now the 1mA flows through the 1k resistor and drops 1V. The MATH kicks in and multiplies the 1V by 0.001 and you get 1mA.
Each channel has its own math function.
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