Teledyne powerpod 400 Manual Do Utilizador

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164-122012 Power
P
OD
 400
 
Page 26 of 42
 
 
10.8.  CALIBRATING A CHANNEL TO ITS INCOMING SIGNALS 
The POWER
POD
-400 is designed to accept the input from almost any transducer that operates in the 
ranges of zero to five volts, zero to ten volts or four to twenty milliamps.  In most cases, transducers are 
capable of having their minimum signal and maximum signal adjusted to correspond with the minimum 
(ZERO) and maximum (SPAN) unit-of-measure that they are designed to reflect.   
For example: 
A transducer designed to output 0 volts while reading a temperature of 0 degrees centigrade and output 5 
volts while reading 100 degrees centigrade is connected to channel one of the POWER
POD
-400
In actuality, the transducer is sending -0.23 volts at 0 degrees and 5.11 volts at 100 degrees.  By zeroing 
channel one of the POWER
POD
-400 while reading the low signal from the transducer, the display will be 
000.0 when the temperature is 0
°C.  Like wise, by setting the CAL value to 100.0 while reading the 5.11 
volt signal causes the POWER
POD
-400 to display 100.0 when the temperature is actually 100
°C. 
This procedure will not account for any non-linearity in any transducer’s output.  That is, the 
accuracy/calibration of any transducer must be independently set, checked and verified before 
connecting to the POWER
POD
-400, or, the transducer/ POWER
POD
-400 combination must be 
calibrated together as a system, if the accuracy of the whole system is to be known. 
10.8.1.  Resetting the Zero Only 
 
 
 
 
 
 
While the SETUP/CAL menu is being displayed and after making a selection from the CHANNEL 
SELECT
 menu, select CALIBRATE by pressing the number 7 key followed by ENTER, then choose 
ZERO ONLY by pressing the number 1 key and ENTER.  The ZERO menu will be displayed which also 
displays the selected channel number and the signal being received.  If this signal is an acceptable signal 
for zero, press the ENTER key to accept it.  If the indicated signal is not an acceptable level for reading 
zero, the operator has an opportunity at this stage to correct any problems while reading the incoming 
signal before pressing the ENTER key and accepting it. Alternatively, the operator can press ESC to exit 
the SETUP/CAL mode and return to it later.  After accepting the displayed signal level as the zero point, 
the display returns to its previously programmed settings.  See Appendix D. 
 
10.8.2.  Resetting the Span Only 
 
 
 
 
 
 
 
After selecting a channel in the CHANNEL SELECT portion of the SETUP/CAL menu, press 7 + 
ENTER
 to select CALIBRATE.  SPAN ONLY is selected by pressing number 3 + ENTER.  The 
SPAN window is displayed which contains the chosen channel and the incoming signal on that channel.  
If the displayed signal is an acceptable full range value, press ENTER to accept it.  The previously 
programmed display returns with the selected channel now displaying the CAL’d value.  If the incoming