Siemens SITRANS FUS1020, Manual, Page: 183 / 251

6-61
1020NFM-1D
Section 6
6.10.6 THE ANALOG OUTPUT TRIM MENU
Analog Output Trim allows you to fine-tune the meter’s current outputs using a multimeter connected
to the output under test. In addition, you can use a frequency counter to fine-tune the meter’s pulse rate
output. These trim functions adjust the zero offset of the analog output. The span adjustment is not
user adjustable. Connect it in series with the 4-20mA current loop of the 1020.
NOTE: The current, voltage, and Pgen trimming will be limited by the 12-bit resolution of the
meter’s D/A Convertor (DAC).
To access the Analog Output Trim menu press <Right Arrow>.
ANALOG OUTPUT TRIM MENU STRUCTURE
Analog Output Trim Trim Io1 Operate
Trim @ 4mA
Indicated mA = x.xx
Trim Io2 Operate
Trim @ 4mA
Indicated mA = x.xx
Pgen Operate (Single Channel only)
Trim @ 1kHz
Indicated Hz = xxxx
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Current Output Trim (Io1 & Io2)
(Note: Can be trimmed to within .005 mA of nominal.)
To calibrate a current output (Io1 or Io2):
Set up the multimeter to read Amps, then connect it to the supply and return terminals of the
current output under test. Note that the loop must also be supplied with an external voltage.
Move the highlight to the port to be tested, press the <Right Arrow>, then press the <Down
Arrow> to move the cursor to Trim @ 4mA.
Press <ENTER>. This triggers a 4.00 mA pop-up window. The multimeter should now be read-
ing 4.00 mA.
If the multimeter reading does not match, use PC numeric keys or KeyPad to enter the multi-
meter reading.
Press <ENTER> to register setting. This adjusts the meter’s DAC (digital-to-analog converter)
so that a 4mA output corresponds with 4mA on the multimeter.
Re-check the multimeter to make sure that it is now reading 4mA.
PGEN Output Trim (Single Channel models only)
(Note: Can be trimmed to within 1.25 Hz of nominal.)
To calibrate a pulse rate output (PGEN):
Connect a frequency counter to the supply and return terminals of the pulse rate output under
test.
Defragment: Selecting YES for this item consolidates memory data blocks into contiguous storage;
collapsing the filler regions. You may be able to use an additional block for site or datalogger storage as
a result. Use this command if you seem to be out of memory even though the Data Memory Left item
indicates free capacity.
To view the amount of data memory bytes available press the <Right Arrow>.