KEPCO BHK-MG 40W (Half Rack) Series - Manual (Page 38)

2-8
BHK-1/2-MG SERIES 121313
NOTE: If tolerances specified in the following steps are exceeded, refer to Section 4 and reca-
librate the unit.
6. Compare the programmed output voltage value with the voltage reading of the DVM; the
difference between the two should not exceed 0.025% of the nominal voltage of the unit.
7. Compare the voltage reading of the LCD with that of the DVM; the difference between the
two should not exceed 0.05% of the nominal voltage of the unit.
8. Press VSET key and enter different value for output voltage, then repeat steps 6 and 7
using different values for programmed voltage.
9. Disable the output by pressing OUTPUT ON/OFF key; verify LCD reads 0.0V and 0.0mA
within 0.05% of the nominal voltage of the unit.
10. Disconnect DVM and connect precision shunt (see PAR. 4.2) across front panel output ter-
minals; connect DVM across shunt (sensing terminals).
11. Using VSET key, set output voltage to 30V.
12. Similarly, using ISET key, program output current to the nominal output current of the power
supply (e.g., for BHK 500-80MG, 80mA is the nominal output current).
13. Press OUTPUT ON/OFF key to enable the output of the unit. Verify the LCD reads CC
(constant current mode) and a small value for output voltage (R
S
x I
o (prog)
x 0.001) in volts,
where R
S
= resistance of shunt in ohms and I
o (prog)
= the actual value for current pro-
grammed in step 12 (in milliamperes).
14. Note DVM reading (V
DVM
) and calculate the output current using the formula I
O
=V
DVM
x
1000/R
S
in milliamperes (mA).
15. Compare the programmed output current value (step 12) with the value shown indirectly by
DVM (calculated in step 14); the difference between the two should not exceed 0.05%
I
O
max ±(TOL
Rs
)% I
O
, where I
O
is the output current and TOL
Rs
is the tolerance of the pre-
cision shunt (step 10).
16. Compare the output current value shown by the LCD (step 13) with the value shown indi-
rectly by DVM (calculated in step 14); the difference between the two should not exceed
0.05% I
O
max ±(TOL
Rs
)% I
O
.
17. Repeat steps 15 and 16 using different values for programmed current.
18. Disable the output by pressing OUTPUT ON/OFF key, turn-off power supply and discon-
nect the shunt.
2.6 INSTALLATION
2.6.1 BENCH TOP USE
The unit is designed to be used as a bench top instrument. Front panel output terminals are pro-
vided for easy access. However, if the application requires remote sensing, it is necessary to
use rear output terminals for sensing connections.