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Which model should I get?

2302, 2303, 2303-PJ, 2304, 2306, 2306-PJ, 2306-VS, 2308
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engr38
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Joined: December 21st, 2013, 9:31 pm
Country: United States

Which model should I get?

Post by engr38 » December 21st, 2013, 9:54 pm

I need advice on which 2300 series model is best suited to my application. Actually, from the web descriptions I cannot determine what is really even different between the models. The side by side tables show them having essentially the same specifications and features. Why would I choose the 2302 over the 2303 or 2308 and vice versa?

Also what is the practical purpose of the charger chanel? Charger design? For the purpose of simulating /testing the charger, load, and battery at the same time can't I just connect a regular charger to my circuit? I don't understand what benefit there is to having a charger built in when I can just as easily connect one externally.

My application is very similar to a mobile phone or portable radio. It will also operate in sleep mode and wake on quickly.

Thanks

Andrea C
Keithley Applications
Keithley Applications
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Re: Which model should I get?

Post by Andrea C » December 27th, 2013, 8:51 am

Having the charger simulation channel allow testing of the battery charger control circuits in the DUT.
The Channel 1 battery channel can be set to a low voltage and can sink current to simulate a discharged battery.
The Channel 2 charger channel can supply current and measure the current drawn.
As the battery becomes charged, the charger control circuit should be consuming less power.

I agree, the differences among all the models are subtle.
You may have seen the selector guide already:
http://www.keithley.com/support/data?asset=50347

Andrea

engr38
Posts: 7
Joined: December 21st, 2013, 9:31 pm
Country: United States

Re: Which model should I get?

Post by engr38 » December 30th, 2013, 8:37 am

Not quite the detail I was looking for. In the SMU thread Dale C was saying that the 2308 is the newest and most popular unit. Why is it the most popular? I of course have seen the comparison chart and don't see any meaningful difference. The 2306 vs 2308 for example, they appear exactly the same to me. The differences appear to be so little the 2308 appears like just a newer version of the 2306. I wonder why the 2306 isn't "legacy" and simply replaced with the 2308 for new purchases. I can phrase the question this way: Why would I choose to buy a 2306 instead of a 2308?

Dale C
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Re: Which model should I get?

Post by Dale C » December 30th, 2013, 12:14 pm

The 2308 has 4 current ranges vs the 2306’s two current ranges. Thus the 2308 offers better current resolution for readings between 5mA and 500mA.
If a user wants to look at the actual load current waveform, the 2308 has a pure analog output which can be displayed on a scope or digitized and transmitted to a PC. The 2306 does not have that feature. Those are the two main differences. Also we improved the stability of the 2308 output and the user has a choice of output connections for optimized stability or optimized transient response.
Current Ranges
2308 2306
5A 5A
500mA
50mA
5mA 5mA

Analog Output
Model 2308
Two analog outputs:
5A/500mA range: 1V/A output
50mA/5mA: 1V/10mA output

Model 2306
Not available

The 2308 is definitely an improvement over the 2306. They are pretty much code compatible.

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