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2450: Delay when switching between source voltage ranges

Models 2450, 2460, 2461, 2470
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michaelkopitin
Posts: 1
Joined: May 12th, 2021, 10:20 am
Country: Russian Federation

2450: Delay when switching between source voltage ranges

Post by michaelkopitin » May 12th, 2021, 11:01 am

If the new value of the source voltage to be set is in a different range,
than the previous one, there is a time delay. If both voltages are in the same
range, there is no delay.

Single range option:
The first voltage is 0.3V, the second is 1V

Dual range option:
The first voltage is 0.3V, the second is 3V

In both cases, the duration of the second pulse is 100 ms.

The dual range option is required to be the same as the single voltage range option.

How to solve this problem?
Attachments
Dual_range_option.png
Dual_range_option.png (1.31 MiB) Viewed 226 times
Single_range_option.png
Single_range_option.png (1.28 MiB) Viewed 226 times

Andrea C
Keithley Applications
Keithley Applications
Posts: 1565
Joined: October 15th, 2010, 10:35 am
Country: United States
Contact:

Re: 2450: Delay when switching between source voltage ranges

Post by Andrea C » June 11th, 2021, 8:22 am

To get good timing control on the waveform sourced by the 2450, is best to use the trigger blocks to load values from a source configuration list.
The config list can specify not only the source value, but the range to use, the limit to apply, etc.
Additionally, a timer object can be used to generate events at well controlled intervals. A wait block in the trigger model can detect the timer events and afterward load a value from the source list.

Here is scope shot using a three point source list and 100msec time intervals.
CH2 of of the scope are digital output timing marks at DIO line 1 in response to each timer event.
2450_TimeControlled_SourceList.PNG
scope shot of 2450 voltage vs. time
2450_TimeControlled_SourceList.PNG (37.62 KiB) Viewed 91 times
In attached TSP file are the lines of TSP command set code to make it happen.
Attachments
KI2450_SrcRangeChange_Controlled_Timing.tsp
(3.24 KiB) Downloaded 8 times

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