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M odel 4085M
3-29. Software Disc
3-30. The software disc furnished with the 4085M contains the following three files.
REVID
S W M
DIAG
REVID : Indicates the version of the software stored on the disc.
This file contains subprograms that control all 4085M functions, such as
SWM :
establishing the COM block necessary for the sub programs, connecting the
measurement ports to user-specified measurement pins, clearing the 4085A,
and displaying connection status. To use these subprograms, you simply call
them in your main program.
DIA G :
This file contains the diagnostics program used to verify normal operation of
4085M. Refer to Section IV for details on DIAG.
3-3 1. Relay Protection
3-32. The 4085A contains many mechanical relays that are switched to establish various
connection configurations between the measurement ports and m easurem ent pins.
Because of their m echanical nature, the relays are subject to carbon build up on the
contact surfaces, which, if left unchecked, degrades m easurement accuracy. To guard
against this, the furnished softw are has two special features. Each is described below.
Dry Switching:
When the relays are switched, output from the 4145A is set temporarily to zero in
order to prevent arcing. This is called "dry switching" and it is an integral part of
the furnished software.
Contact Cleaning :
When the Relay Test of the diagnostics program is performed, the relays are
switched while a low current is forced through the contacts. This is called "wet
switching" and it cleans the contacts of the relays. To ensure correct relay
performance, perform the relay test every day.
3-33. H P-lE ADDRESS
3-34. Set the HP-IB addresses of the 4084A and 4145A as listed in Table 3-3. If an
interface other than the com puter's internal interface (select code 2) is used, or if an
HP-IB address listed in Table 3-3 cannot be used for the 4084A and 4145A, the furnished
software must be m odified. The procedure for m odifying the software is given below :
l . Clear the computer's memory.
2. Load S W M
3 . Enter EDIT m ode.
SCRATCH A
LOAD "SWM"
EDIT
Section
III
.
3-1 3
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