KEPCO BHK-MG 200W (Full Rack) Series - Manual (Page 38)

2-8
BHK-MG (OPR) 022014
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.
2.6.2 RACK MOUNTING
The unit can be mounted directly in a 19-inch wide rack, after the bench-type feet are removed.
Optional slides (see Table 1-5) can be used. Installation of slides can improve access to the unit
(see Figure 1-2).
2.7 WIRING INSTRUCTIONS
Interconnections between an a-c power source and the power supply, and between the power
supply and its load are as critical as the interface between other types of electronic equipment.
If optimum performance is expected, certain rules for the interconnection of source, power sup-
ply and load must be observed by the user. These rules are described in detail in the following
paragraphs.
2.7.1 SAFETY GROUNDING
Local, national and international safety rules dictate the grounding of the metal cover and case
of any instrument connected to the a-c power source, when such grounding is an intrinsic part of
the safety aspect of the instrument. The ground terminal of the source power connector (Figure
2-2) is connected to the BHK-MG chassis and the instructions below suggest wiring methods
which comply with these safety requirements; however, in the event that the specific installation
for the power system is different from the recommended wiring, it is the customer's responsibility
to ensure that all applicable electric codes for safety grounding requirements are met.