
UM344-2 CALIBRATION AND MAINTENANCE
September 1995
FIGURE 6-3 RTD/Ohm Current Source Calibration Set Up
3. Read and note, to three decimal places, the value of the forcing current as displayed by the digital
microammeter.
4. In response to the screen prompt, enter the noted current (in microamps) into the MXC. For example:
51.125 µA.
5. Press ENTER (F4). The screen will display:
Press CONT (F4) to calibrate.
Press ABRT (F3) to QUIT without changing calibration.
Calibration is now complete.
6. Turn OFF the power supply.
Disconnect the test microammeter and reconnect the test resistance decade box to the transmitter
(Figure 6-2).
7. Turn ON the power supply and return to Section 6.1.3.1 and again perform a calibration check.
If accuracy is within specifications, disconnect test equipment. Connect all wires and install enclosure
cap.
If accuracy is still NOT within specifications, additional calibration is required.
1) Turn OFF the power supply.
Bench Power
Supply (DC)
_
+
Digital
Microammeter
+
_
250
MXC
+
_
+
_
Signal
Test
X02827S1 1 of 2
1
2 3
Model 344
Terminals
WARNING: BURNING
EPROM WILL CHANGE
CALIBRATION CHARAC-
TERISTICS
CONT
ABRT
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