KEPCO MBT Series - Manual (Page 32)

2-8
MBTSVC 111609
6. Press slew keys, first , then ; verify that beeps are heard and displayed programmed
voltage increases when , is pressed and decreases when is pressed.
7. Press Vadj key, then enter a numeric value within the voltage range of the power supply and
press ENTER key. Verify that the display shows the new value for programmed voltage.
8. Press Iadj key, then enter a numeric value within the current range of the power supply and
press ENTER key. Verify that the display shows the new value for programmed current.
9. Connect a digital voltmeter (DVM) (see PAR. 5.5.1.a) to the OUTPUT and COMMON termi-
nals at the rear panel.
10.Program the nominal value for current as specified in step 8 above (the nominal value refers
to the rating of the unit, e.g., for the MBT 100-2.4, nominal voltage is 100V and nominal cur-
rent is 2.4A).
11. Press DC ON to enable the output of the unit. The OUTPUT ENABLED status indicator goes
on and the display shows the actual output voltage and current (current = 0A) of the power
supply.
NOTE: If tolerances specified in the following steps are exceeded, calibration adjustments
may have changed during transit; refer to PAR. 5.5 and recalibrate the unit.
12.Compare the voltage shown on the front panel display with the voltage reading of the DVM;
the difference between the two should not exceed 0.1% of the nominal voltage of the unit.
13.Repeat step 7 using a different value for programmed voltage and compare the programmed
voltage with the voltage reading of the DVM; the difference between the two should not
exceed 0.024% of the nominal voltage of the unit.
14.Disable the output by pressing DC OFF key and repeat step 8 above using a different value
for output current.
15.Disconnect DVM and connect precision shunt (see PAR. 5.5.1.b) across OUTPUT and
COMMON terminals at rear panel; connect DVM across shunt (sensing terminals) and pro-
gram nominal value for voltage.
16.Press DC ON key to enable the output of the unit. Verify VOLTAGE MODE indicator goes off
and CURRENT MODE indicator goes on. Verify that front panel display shows a small value
for output voltage (R
S
x I
Oprog
where RS = resistance of shunt in ohms) and the actual value
for current programmed in step 14. Note DVM reading (V
DVM
) and calculate the output cur-
rent using the formula V
DVM
/RS.
17.Compare the output current value shown on the front panel display with the value calculated
above (step 16); the difference between the two should not exceed 0.15% of the nominal
current of the unit.
18.Repeat step 8 using a different value for programmed current and compare the programmed
current. Calculate the output current using the DVM voltage (see step 16), then compare the
programmed current with the calculated output current; the difference between the two
should not exceed 0.1% of the nominal current of the unit.
19.Disable the output by pressing DC OFF key and turn off power supply.