Datasheet

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A GREATER MEASURE OF CONFIDENCE
SWITCH/MEASURE SYSTEMS
12
Integra Series Multimeter/Switch Systems
Alarm Limits/Digital Outputs
The digital output lines can trigger external alarms without the need for a PC connection. The instrument
can be programmed to provide alarms when any pre-set limits are breached. Limits can be applied to all
measurement functions except continuity, which has its own alarm beeper. The limit test is performed
after “mX + b” and math operations.
Limit types: Each channel has four independently programmable limits, each of which can be assigned a
value. These are:
1. Limit1 High (for example, 1% higher than the expected reading)
2. Limit1 Low (for example, 1% less than the expected reading)
3. Limit2 High (for example, 5% higher than the expected reading)
4. Limit2 Low (for example, 5% less than the expected reading)
The outputs can be positive or negative true, pulse, or fixed level. Pulse widths are pro-
grammable.
Master Limit: In addition to these limit alarms, a master limit is provided. It is logically
“or”-ed with the four limits and is active every time any of the other limits are breached.
Each of the alarm limits and the master alarm is mapped to a specific output pin on the
9-pin male connector that handles the output of that alarm limit.
Electrical Capabilities:
• 250mA sink (output).
• TTL level outputs (no external supply is needed).
• Open collector output up to 33V with external supply.
• Ability to trigger or start a scan by connecting to one of the digital input lines.
On-board Data Storage
Buffer: There are non-volatile “read and transmit” memory buffers (in other words, the buffer can be
emptied while it is being filled) in each system. The buffer can be configured in “wrap around” mode for
recording readings continuously for long periods. There is no need to stop taking data, reset the instru-
ment, or change memory cards. The wrap around memory can be configured to issue a Service Request
(SRQ) at predetermined points in the scan. An SRQ can be issued when the buffer is one-quarter full,
one-half full, three-quarters full, or completely full. The instrument can be commanded to download the
readings without interfering with the current acquisition; therefore, data acquisition and retrieval can
occur simultaneously. When the buffer is full, the instrument returns to the beginning of the buffer and
starts writing in the locations emptied by the previous download.
Timestamp: The readings in the memory can be timestamped to trace the progress of a test. The time
can be configured as either:
• Real time: The actual calendar day and time.
• Relative Time: Time is relative to the first reading stored in the buffer.
Master Limit Alarm
Limit 2 Low Alarm
Limit 2 High Alarm
Limit 1 Low Alarm
Limit 1 High Alarm
Ground
Interlock (input pin)
Flyback Protection Diode
External Trigger (input pin)
5
4
3
2
1
9
8
7
6
Triggering and I/O Capabilities — On-board Data Storage
Figure 4. Structure of the 9-Pin Male Digital I/O
Connector