CONFIGURATION AND CALIBRATION
FIELD CALIBRATION
4 - 6
15 December 1994
I-E96-301B1
®
Field Calibration Instruction
The original slave calibration is done in the factory in a con-
trolled, stable environment. Ambient temperature must remain
constant at 25 (±1.0) degrees C. The field calibration location
must be free from drafts.
After each slave is powered-up in its calibration location, allow
some warmup time before calibration for the most accurate
results. This warmup time should be at least 15 minutes.
There are three types of inputs on the slave:
•
Low Level Voltage Range (-100 mV to +100 mV).
•
High Level Voltage Range (-10V to +10V).
•
3-Wire Resistance Range (5 Ohms to 500 Ohms).
Each of the 16 inputs can be used as a high level, a low level or
a 3-wire RTD input.
The high level, low level and 3-wire RTD inputs can be field cal-
ibrated with this procedure.
We recommend checking the accuracy of the channel within
each of the specified ranges after calibrating each channel.
Test Equipment Required
The devices required to perform the field calibration are:
•
One powered MMU slot per slave (+5V,
±
15V, with power
fail interrupt).
•
One MFP with slave expander bus dipshunts.
•
An MFP interface device, such as a computer interface unit
or an engineering work station or configuration and tuning
module.
•
An NKAS01 cable and its termination device (NTAI06), or
an NKAS02 cable and its termination devices (two NIAI05s).
Each input type to be field calibrated requires ultra-stable,
known precision sources.
Low-Level Voltage
Source
•
-100 mV to +100 mV range with an accuracy of
±
10 micro-
volts (or
±
0.005 percent of this range).
•
DC output resistance of less than 2.0 Ohms.
