2-16 Model 2790 SourceMeter
®
Switch System User’s Manual
Open interlock errors
The 7751, 7752, and 7753 modules have an interlock. When the interlock is open (disabled),
the I-source (7751, 7752, and 7753) and V-source (7751 and 7753) are disconnected from
the switching matrix. Details on enabling the interlock are explained in Section 5. The fol-
lowing errors are associated with an open interlock.
Front panel messages:
• INTRLCK OPEN is displayed briefly if you attempt to close channel 18, 19, or 21
with interlock open.
•With the INPUTS switch in the REAR position (in), readings will overflow
(OFLO) when the interlock is open.
• In the case of the OFLO readings for open interlock, the IL1 or IL2 message will
also be displayed. IL1 is displayed for a slot 1 violation and IL2 is displayed for a
slot 2 violation. In the case of errors for both slots, the IL1 message takes
precedence.
•Overflowed readings stored in the buffer do not provide interlock status. You cannot
tell if the overflow readings are true overflows or the result of open interlock (see
“Remote programming errors”, below).
Remote programming errors:
• When an open interlock is first detected, error +860 (slot 1 interlock violation)
or +861 (slot 2 interlock violation) occurs. The questionable event register in the
status byte can be read to determine which interlock tripped (see Section 11 of the
Model 2790 Reference Manual).
• The firmware polls for interlock violations every 50msec. To avoid filling up the
error queue, once an error is issued for a given interlock, it must be reset (interlock
enabled) before another error event will be issued to the status model for the same
interlock.
• Error -224 (parameter error) occurs if you attempt to close channel 18, 19, or 21
with interlock open.
•With interlock open, channel 20 will close and remain closed while interlock is
open. ROUT:OPEN:ALL will open all channels except channel 20.
ROUT:MULT:OPEN will generate error -224 (parameter error).
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