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Difference between 228 and 228A?

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guttagrynna
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Difference between 228 and 228A?

Post by guttagrynna » November 10th, 2013, 9:53 am

What is the difference between current/voltage sources Keithley 228 and 228A?

Dale C
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Keithley Applications
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Re: Difference between 228 and 228A?

Post by Dale C » November 11th, 2013, 6:18 am

The main differences were
1. More responsive front panel (about three times faster the Model 228)
2. Reduction in GPIB command process time( model 228 was about 240msec and Model 228A is about 75msec)
3. Model 228A dwell time was improved from 20msec to 10msec minimum).

jesica1
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Re: Difference between 228 and 228A?

Post by jesica1 » January 12th, 2016, 10:19 pm

The 228A Differential Baratron® is a general-purpose differential capacitance manometer is available in full-scale measurement ranges from 0.2 to 1000 Torr, two trip relays, and can be configured with a wide variety of fittings, input/output signals, and electrical connectors. Is this statement right?

Dale C
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Re: Difference between 228 and 228A?

Post by Dale C » January 13th, 2016, 5:37 am

That may be. But this forum is about Keithley products.
The Model 228 and 228A were voltage/current sources.

jesica1
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Re: Difference between 228 and 228A?

Post by jesica1 » January 15th, 2016, 2:18 am

oh.. ok .. tanks ..:D

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