ero electronic DPS - 5.2 General Guide Lines for Calibration; 5.3 Calibration Procedure

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5.2 GENERAL GUIDE LINES FOR CALIBRATION
For a good calibration it is necessary to proceed as follows:
a) - The instrument under calibration should be mounted in its case
in order to keep the internal temperature constant.
b) - The ambient temperature should be stable.
Avoid any drift due to air-conditioning or others.
c) - The relative humidity should not exceed 70%.
d) - Minimum warm-up time must be 20 minutes.
e) - Operate possibly in a noise free environment.
f) - During calibration, connect one input at a time and supply the
input signal when the group is enabled only.
For this calibration procedure it is necessary to use calibrators with
the following accuracy and resolution:
ACCURACY
1) For TC, mV or V input:
+ 0.005% output + 0.001% range + 5 µV
2) For current input:
+ 0.025% output + 0.0025% range + 0.01 µA
3) For RTD input: + 0.02 % + 0.0025 Ω/decade.
4) For Could junction compensation: better then 0.1 °C
RESOLUTION
1) For TC, mV input: 1 µV
2) For current input: 0.2 µA
3) For RTD input: 10 mΩ
4) For could junction compensation: better then 0.1 °C
5) For V input : 100 µV
5.3 CALIBRATION PROCEDURE
5.3.1 FOREWORD
During calibration procedure the instrument will show CL and CH
parameters if analog retransmission is selected only.
For frequency input type, no calibration procedures are provided.
NOTE: Calibration parameters are logically divided in groups of
two parameters each (initial and final scale value).
After each group the calibration check is provided but it is
also possible to do it without a new calibration is made.
When calibration check is required only, press twice the F
pushbutton when "OFF" is shown on the display. The
instrument goes directly to the specific group check.
The alphanumerical display will show the parameter code (C - )
while the numerical display will show "ON" or "OFF".
Using ▲ and ▼ pushbuttons it is possible to select between "ON"
or "OFF".