Agilent Technologies L4400 - Manual (Page 94)

82 L4400 User’s Guide
3 Operating and Programming

Figure 3-13. Scanning with External Instruments.
Figure 3- 14 shows the connections required to make a series (scan) of
two- wire measurements (e.g. ohms, DCV) using ABus1 of the L4421A .
Sequence The L4421A outputs a Channel Closed pulse on pin 5 of its
Ext Trig connector when a relay is closed and has fully settled
(including any channel delay). By connecting this pin to the DMM’s
external trigger (Ext Trig) input, the DMM is triggered to take a
measurement. When the measurement is complete, the DMM outputs a
pulse from its DMM (VM Complete) output. Connecting this output to pin
1 (Channel Advance) of the L4421A’s Ext Trig connector advances the
scan and closes the next channel in the scan list.
Input

Channels
Common Terminals
(COM)
H
L
DMM