Tektronix Technical Forums are maintained by community involvement. Feel free to post questions or respond to questions by other members. Should you require a time-sensitive answer, please contact your local Tektronix support center here.

6221/2182A Delta mode - output blocked by interlock

Post Reply
Posts: 2
Joined: November 4th, 2020, 7:54 am
Country: Germany

6221/2182A Delta mode - output blocked by interlock

Post by mehdi1 » November 4th, 2020, 8:01 am


I am trying to set up 6221 current source with 2182A nanovoltmeter together in a Delta mode for a resistivity measurement.
I have followed this process:

1.Connect 2182A and 6221 together with NULL MODEM serial cable.
2.Connect 2182A and 6221 together with trigger link cable.
3.Set 2182A to RS-232 mode (19.2k BAUD, Flow is off, Terminator is CR).
4.Set 6221 to GPIB mode.
5.Press DELTA on 6221

However, an error 402 occurs "output blocked by interlock". Can I avoid to have to deal with the 6221 interlock ? If not what should I do ?

Thank you in advance,


Andrea C
Keithley Applications
Keithley Applications
Posts: 1548
Joined: October 15th, 2010, 10:35 am
Country: United States

Re: 6221/2182A Delta mode - output blocked by interlock

Post by Andrea C » November 8th, 2020, 6:49 am

The 6221 current source can tolerate compliance voltage as high as 100V.
You can set the v limit to lower value, but as much as 100V is possible.
Since this represents a shock hazard, the product has an interlock.
This is similar to how a microwave oven will not start or will halt if the door is opened.

Check out the 6221 Reference Manual on the interlock and illustrations on simple connection to a switch that closes when “all clear”.

Post Reply

Return to “Resistivity Measurements”

Who is online

Users browsing this forum: No registered users and 2 guests