M8XT2
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: [email protected]
EM-5470 Rev.4 P. 3 / 4
CALIBRATION
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following.
■
ZERO/SPAN & UP/DOWN SWITCHES
Fine zero and span adjustments can be done with the ZERO/
SPAN Selector and UP/DOWN switches. Calibrated values
are stored in the non-volatile memory, which will not be lost
even when you turn off power supply to the unit.
The output 1 and output 2 can be independently adjustable.
Zero and span are respectively set to 0% and 100% at the
factory, and field calibration can be reset to ex-factory set-
ting if necessary.
Adjustable range:
±5%
Zero/Span Selector
ZERO
: UP/DOWN switches usable for zero adjustment.
OFF
:
UP/DOWN switches unavailable.
SPAN
: UP/DOWN switches usable for span adjustment.
UP/DOWN Switches
UP
:
Pressing UP increases adjusted values.
DOWN
: Pressing DOWN decreases adjusted values.
■
FRONT VIEW
UP Switch
Status Indicator LED
Configurator Jack
DOWN Switch
■
BOTTOM VIEW
Zero/Span Selector
S
Z
OFF
Z
S
Zero/Span Selector
MODE
SW POSITION
SPAN
S
OFF
■
ZERO
Z
■
HOW TO CALIBRATE THE ZERO & SPAN
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the power supply on and warm up for
more than 10 minutes.
The output 1 and output 2 adjustments are linked except
for (2) and (6).
1) Apply 0% input.
2) Select the Output 1 Zero: Slide the Zero/Span Selector to
the position Z.
Select the Output 2 Zero: Slide the Zero/Span Selector to
the position Z while pressing UP switch.
3) Press UP or DOWN switch and adjust the output to 0%.
Incrementing speed will be doubled when you keep press-
ing a switch.
4) Put the Zero/Span Selector back to the position OFF.
5) Apply 100% input.
6) Select the Output 1 Span: Slide the Zero/Span Selector to
the position S.
Select the Output 2 Span: Slide the Zero/Span Selector to
the position S while pressing UP switch.
7) Press UP or DOWN switch and adjust the output to
100%. Incrementing speed will be doubled when you
keep pressing a switch.
8) Put the Zero/Span Selector back to the position OFF.
9) Check Zero and Span adjustments again with 0% and
100% input respectively.
10) If the output value is changed, repeat the above proce-
dure (1) – (9).
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HOW TO RESET
After you calibrated manually with these switches, you
can reset them to its ex-factory state by pressing both UP/
DOWN switches at once.
