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164-122012 Power
POD
400 Page 37 of 42
14.2 Zeroing Unit (4 to 20 mA Range)
The following instructions explain how to use the POWER
POD
-400 command signal to supply
4mAmp signal to a channel’s input and set the display to read zero at this current level.
Disconnect all connectors from the channel to be calibrated.
Insure that the channel is set to read 4 to 20 mA signals by performing the following steps.
Press MODE
Press 3
Press ENTER
Press 1, 2, 3 or 4, depending on which channel is to be zeroed.
Press ENTER
Press 4
Press ENTER
Press 3
Press ENTER
The normal display returns and will respond in the 4 to 20 mA mode.
Connect a milliamp meter between pins 14 and 6 on the 15-pin ‘D’ connector corresponding to the
channel to be calibrated.
J1 = Channel 1
J2 = Channel 2
J3 = Channel 3
J4 = Channel 4
Set the command for the selected channel to zero.
Press the CHANNEL # button
Press 1, 2, 3 or 4, depending on which channel is to be zeroed.
Press 0.0 using the numbered key pad
Press ENTER
The milliamp meter should be reading between 3.996 and 4.004 mAmps.
To Zero the meter with a signal of 4mA, perform the following steps.
Press MODE
Press 3
Press ENTER
Press 1, 2, 3 or 4, depending on which channel is to be zeroed.
Press ENTER
Press 7
Press ENTER
Press 1
Press ENTER
Press ENTER again
You have just told a channel to display zero when the input signal is 4mA
!
.