Spectrum Controls 1746sc-INI4i, Руководство пользователя

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User’s Manual Pub. 0300266-04 Rev. A
Chapter 8
Verifying Calibration
Read this chapter to verify your module’s calibration. To verify your module’s
calibration, you need:
• A precision input source whose accuracy is better than or equal to ±1 mV
on a 10 V scale and  0.5  A on a 20 mA scale (such as an Electronic
Development Corporation Programmable IEEE 488 GP-IB DC
Calibrator, Model 521).
•
Programming equipment, such as an Allen-Bradley Hand-Held Terminal
(HHT) or personal computer.
•
Allen-Bradley Advanced Programming Software (APS) or equivalent.
Your module automatically calibrates a channel after it is successfully
configured. It also calibrates a channel every 10 seconds if auto- calibration is
enabled (see Chapter 4). For these reasons, your module should never need
calibration. You may, however, want to verify the calibration periodically using
the procedures provided in this chapter.
Section 8.1
Recommended
Schedule
Although not required, you should verify your module’s calibration once a year
or after any system failure that may have been due to input inaccuracy.
Section 8.2
Verifying Current
Inputs
To verify:
1. Configure your module for 0–20 mA input on all 4 channels using the
following configuration word values:
Address Binary Value Decimal Equivalent
O:e.0 0000 0000 0010 1001 41
O:e.1 0000 0000 0010 1001 41
O:e.2 0000 0000 0010 1001 41
O:e.3 0000 0000 0010 1001 41
e = slot number
2. Let the operating temperature stabilize for 2 minutes.