Miscellaneous Operations; Voltmeter Complete; Remote Operation; General - HP 3478A Technical Manual

The CAL ENABLE Switch on the front
panel should not be in the CAL/ENABLE
position under normal use. It should only
be in that position to calibrate the
instrument.
3-66.

MISCELLANEOUS OPERATIONS

3-67.

Voltmeter Complete

3-68. The Voltmeter Complete connector is a BNC
connector which outputs a signal at the end of the A/D
cycle. The signal is a negative going TTL compatible
pulse with a time period of approximately IµS. The
Voltmeter Complete connector is located on the rear
panel.
3-69.

REMOTE OPERATION

3-70.

General

3-71. The following
dependent information necessary to remotely operate the
3478A over the Hewlett-Packard
Directions for mechanical interface connections to the
HP-IB are given in Section II of this manual. Familiarize
yourself with the front panel operation (local) before
attempting to use the multimeter in remote (HP-IB).
HP-IB is
implementation of IEEE Std. 488-1978,
"Standard Digital
Programmable
ANSI MC 1.1.
3-72. A general description of the HP-IB is in this
manual's Appendix A. Refer to the appendix for any non-
3478A related HP-IB information. It is assumed, in the
following paragraphs, that you are knowledgeable about
the HP-IB.
3-73. The following lists the different 3478A remote
operations.
a. 3478A Response to Bus Messages (paragraph
3-74).
Title
Data
Trigger (GET)
Clear (DCL or SDC)
Remote
Local
Local Lockout
Clear Lockout and Set Local
Require Service (SRQ)
NOTE
paragraphs gives
Interface Bus (HP-IB).
NOTE
Hewlett-Packard's
Interface for
Instrumentation" and
Paragraph
3-76
3-77
3-78
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3-80
3-81
3-82
3-83
Status Byte
Status Bit
Pass Control
Abort
b. 3478A Addressing (paragraph 3-92) and Talk-
Only Mode (paragraph 3-96).
c. 3478A HP-IB Programming (paragraph 3-98).
Title
General
Program Codes
Programming the SRQ
Mask
Clearing Status
Register (Status Byte)
Power-On SRQ
Sending Data to the Display
Home Commands
Reading Data from the
device
3478A
Front/Rear Switch Position
Data Ready Feature
Front Panel SRQ
Fast Trigger
d. Advanced Programming (paragraph 3-117).
Title
General
Extended Ohms Operation
Reading the Binary Status
Byte
Reading the Error Register
3-74.

3478A Response to Bus Messages

3-75. The following paragraphs explain the 3478A's
response to Bus Messages. The multimeter's Bus
capabilities are in Table 3-3.
Mnemonic
SH1
AH 1
T5
Mode, Unaddressed to Talk if Addressed to Listen)
L4
Listen if Addressed to Talk)
LEO
TEO
SR1
RL1
PPO
DC1
DT1
CO
3-8
3-85
3-89
3-90
Table 3-3. 3478A's Bus Capabilities
Interface Function Name
Source Handshake Capability
Acceptor Handshake Capability
Talker (Basic Talker, Serial poll, Talk Only
Listener (Basic Listener, Unaddressed to
No Extended Listener
No Extended Talker
Service Request Capability
Remote/Local Capability with Local Lockout
No Parallel Poll Capability
Device Clear Capability
Device Trigger Capability
No Controller Capability
TM 11-6625-3071-14
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