VTI Instruments Corp.
14
VM3608A/3616A Introduction
Regardless of whether the VM3608A/3616A is configured with other VM3608A/3616A
modules or with other VMIP modules, each group of 16 channels is treated as an
independent instrument in the VXIbus chassis and, as such, each group has its own FAIL
and ACCESS light.
D
ESCRIPTION
The VM3608A/3616A instrumentation module provides 8 or 16 independent channels of a
digital to analog converter (DAC) with 16 bits of resolution. Each channel consists of a
DAC combined with an output amplifier. This module is part of the VMIP family of
instruments and can be combined with up to two other modules to form a high-density
VXIbus instrument that fully utilizes the capabilities of the VMIP.
In order to support accelerated testing, the module supports up to 512 predefined setups.
Each setup is numbered and defines the voltage of each DAC on the board. All the voltages
can then be set with a single command.
To further speed up testing, the DAC module supports up to 16 different scan lists, each 512
entries long. The scan list is a predefined sequence of setups that is loaded into the DACs.
The scan list, when enabled, can be incremented through any of the trigger sources outlined
in the following section.
Both the setups and scan lists are loaded into RAM prior to their use.
All the DACs update synchronously and may be triggered to update via one of three
sources:
1. Trigger source from the front panel input. This input is TTL compatible and is edge
sensitive. The unit may be programmed to trigger on either the rising or the falling edge of
this signal.
2. Trigger source from the VXI TTL trigger bus. Any one of the eight TTL trigger bus lines
may be selected as the trigger source. The unit may be programmed to trigger on either the
rising or the falling edge of this signal.
3. Trigger upon receipt of a word serial command. When this mode is selected, the DACs
will convert when a word serial command is received by the instrument.
F
IGURE
1-2:
F
RONT
P
ANEL
L
AYOUT
bus
FAIL
ACC/
ERR
FAIL
ACC/
ERR
FAIL
ACC/
ERR
J200
J201
J202
Summary of Contents for VM3608A
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Page 6: ...VTI Instruments Corp 6 VM3608A 3616A Preface ...
Page 12: ...VTI Instruments Corp 12 VM3608A 3616A Preface ...
Page 18: ...VTI Instruments Corp 18 VM3608A 3616A Introduction ...
Page 134: ...VTI Instruments Corp 134 VM3608A 3616A Command Dictionary ...