Products > Test Equipment

Switching to rear input through SCPI?

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Svgeesus:
When measuring manually on my Agilent 34465A I often switch between the front and rear terminals. For example when measuring linearity on a voltage controlled oscillator I will have the front terminals measuring the input voltage and the rear ones measuring the resulting output frequency.

I'm slowly getting into test automation and learning about SCPI. Looking at the manual I don't see a command to select which set of terminals is being measured. There is just a command to say which set of terminals is selected:


--- Quote ---ROUTe:TERMinals?

Indicates which input terminals are selected on the 34461A front panel Front/Rear switch. This switch is
not programmable; this query reports the position of the switch, but cannot change it.
--- End quote ---

So do people add/make relays to switch the inputs as an external piece of equipment?

Or does everyone just own multiple, high quality DMMs?

Someone:
There is a different category of instruments for that at Keysight, 34970A -> DAQ970A
Where as Keithley has the option available for "regular" multimeters like the 2000 and DMM6500

alm:
There are DMMs that allow you to switch between front and rear inputs remotely, but the more general solution is a scanner card with a bunch of relays, as Someone wrote.

coromonadalix:
doing this on a mechanical switch will cause wear and tear ......  use dedicated meter with scanner cards  as written above

or use front plug with an externally controlled relays  etc...    i never use the front back switch,  simply to avoid problems or bad contacts

Since some known brands use pcb traces as switch contacts    cough cough stupid ....

Jeroen3:
Except, the DAQ970 doesn't go above 300V or 1A...
If you want the ratings of the 34465A you'd have to do your own relay matrix...

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