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Output
Calibration -
Auxiliary
Output Calibration
200
DR4500A Classic Series Circular Chart Recorder With or Without Control Product Manual
Release M
April 2017
8.4 Auxiliary Output Calibration
Introduction
Calibrate the recorder so that the auxiliary output provides the proper amount of current over the desired
range.
The recorder can provide an auxiliary output current range of from 3.1 to 21 milliamperes and can be
calibrated at 4 mA for 0 % of output and 20 mA for 100 % of output or any other values between 3.1 and
21 mA.
Equipment needed
You will need a standard shop type milliammeter, with whatever accuracy is required, capable of
measuring 0 to 20 milliamps.
Calibrator connections
Refer to Figure 8-2 and wire the recorder according to the procedure given in Table 8-4.
Table 8-4 Set up wiring procedure for auxiliary output
Step
Action
1
With the power off, door open, and the chart plate swung out, tag and disconnect field wiring
from the plug in connector J2 on the auxiliary output PCB (see Figure 8-2).
2
Observing polarity, connect a milliammeter’s leads to the plug for connector J2.
3
Close the chart plate; apply power and allow the recorder to warm up 15 minutes before you
calibrate.
22818
Milliammeter
Plug J2
(auxiliary output)
+
-
Control output
#1 PCB
#2 #1
Control output
#2 PCB
Auxiliary
output PCB
Figure 8-2 Test equipment connections for calibrating auxiliary output
Procedure