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Input and Output Calibration for Recorder with Display
12/03 DR4300 Circular Chart Recorder Product Manual 153
5.6 Current Output Calibration
Introduction
Calibrate the recorder so that the output provides the required amount of current over the desired range. The
recorder can provide an output current range of from 0 to 20 milliamperes and can be calibrated at
4 mA for 0 % of output and 20 mA for 100 % of output, or at any other values between 0 mA and 20 mA.
Equipment needed
You will need a standard shop type milliammeter, with whatever accuracy is required, capable of measuring
0 milliamps to 20 milliamps.
Calibrator connections
Refer to Figure 5-6 and wire the recorder according to the procedure given in Table 5-10.
Table 5-10 Set Up Wiring Procedure for Current Proportional Output
Step Action
1
With the power off, door open, and the chart plate swung out; tag and disconnect field wiring
from the terminals on terminal block TB5 on the printed circuit assembly for pen 1 or pen 2 as
applicable (see Figure 5-6).
2
Observing polarity, connect a milliammeter’s leads to TB5 terminals.
3
Close the chart plate: apply power and allow the recorder to warm up 15 minutes before you
calibrate.
Main PCA
Pen 2
Main PCA
Pen 1
7
TB2
TB1
7
TB2
TB1
+
_
TB5
1
_
+
Milliammeter
24189
Figure 5-6 Test Equipment Connections for Calibrating Current Output