Section III
CD
Model 4085M
LI N E O N/OFF Switch :
This swicth turns the 4084A on and off.
4084A.
Power for the 4085A
is
supplied by the"
HP-lB Status Indicators:
These LED lamps show the HP-lB Status of the 4084A.
SWITCHI N G M ATRIX CONTROLLER FAIL Indicator:
This lam p lights when the 4084A's self test function, which continuously
monitors transmissions between the 4084A and 4085A detects an error
condition. While this lamp is lit, the 4084A .ignores most HP-IB commands.
Refer to Section IV for instructions on how to recover from a 4084A FAIL
-condition.
LOCAL/TEST Key and Indicator:
Pressing this key while the RMT HP-lB indicator lamp is lit (4084A is under
remote control) sets the 4084A to local control (RMT lamp goes off). Pressing
this key while the 4084A is set to local control starts the RELAY TEST. The
indicator lamp at the center of the key lights during the RELAY TEST.
Note
Before executing the RELAY TEST, be sure to attach the 1 6075A
Relay Test Adapter to the 4085A. Test results are indicated by the
F AIL lamp adjacent to the LOCAL/TEST Key on the 4084A and by
the lamps on the individual pin boards. For further details on the
RELA Y TEST, refer to Section IV, M aintenance and Diagnostics.
CD
SWITCHING M ATRIX FAIL Indicator:
3-2
This lamp lights continuously when the 4085A has failed self test, and it flashes
off and on when the 4085A has failed the RELAY TEST. Jf this lamp lights,
refer to Section IV for instructions on how to recover from this failure state.
SWITCHING MATRIX OPEN Indicator:
This lamp lights when the 4085A is open (i.e., the m easurement pins are
exposed). When this lamp is lit, the m easurement pins of the 4085A are
disconnected from all m easurement ports.
Figure 3-2. Front Panel Features of the 4084A
