Keithley 3720 User Manual page 126

Section 5: Basic Digital Multimeter (DMM) Operation
4. Set threshold resistance:
5. Apply the resistance to be tested. If using a switching module, perform the following steps to
close the appropriate channel.
6. Press the TRIG key and observe the displayed reading.
7. To measure other switching channels, repeat steps 5 and 6.
NOTE
8. To disable continuity testing, select a different function (for example, DCV).
9. When finished, press the OPENALL key to open all channels.
NOTE
NOTE
NOTE
5-52
x
Turn the wheel to scroll to the "THRESHOLD" menu item (right most menu item) and press the
ENTER key.
x
Using the wheel, dial in the desired resistance to be used as a threshold (1:–1000: .
x
Press the ENTER key to set.
x
Press the EXIT key to leave the "CONT ATTR MENU."
a) Use the wheel to dial in the channel number.
b) Press the CLOSE key.
If the measured circuit is below the set threshold level, the instrument will display the
resistance readings. If the measured circuit is above the threshold level, the
instrument will display the message "OPEN."
Limits and digital outputs cannot be used when testing continuity with the continuity
(CNT) function. If you need to use these operations, use the 2W: function to test
continuity.
Also see the bus command dmm.threshold for more information on threshold
attributes.
dmm.threshold is a common ICL command. To enable a unique continuity
threshold, first select the function dmm.func = "continuity", then select the
threshold value. The threshold value will be remembered after exiting when returning
to the function (unless reset).
Series 3700 System Switch/Multimeter User's Manual
Document Number: 3700S-900-01 Rev. A / August 2007