KEPCO BHK-MG 40W (Half Rack) Series - Manual (Page 86)

3-42
BHK-1/2-MG 121313
ANALOG PROGRAMMING, DIGITAL PROGRAMMING = 0:
Eo = (–1)
(V
EXT
) x (10K/10K) x (–1) (10K/10K) x (–1) (R/10K)
= (–1) (0.1 x R) x V
EXT
= –0.1R x V
EXT
(V d-c)
where
R = Internal feedback resistance (K-ohms), determined by Model (see Table 3-10).
V
EXT
= External low impedance voltage source. This source can be either a d-c source deliver-
ing a positive output voltage, or a function generator with an internal positive bias. If the
bias is not available from the function generator, use the digital programming feature of
the BHK-MG to provide proper bias to avoid clipping the waveform at the output of the
power supply.
ANALOG PROGRAMMING COMBINED WITH DIGITAL PROGRAMMING:
Eo = –(0.1 x R x V
EXT
) – Eout
DP
(V d-c)
where
Eout
DP
= Output voltage programmed digitally (from either local keypad or remote GPIB bus)
(See above for definitions of R and V
EXT
.)
3.8.3.2 CURRENT MODE
With the power supply in current mode (see Figure 3-13 or 3-14) and the digitally programmed
output voltage at zero, varying the low impedance voltage source from 0 to +10V causes the
output current of the power supply to vary linearly from 0 to I
O
max with a slope of (0.1 x I
O
max)
mA per volt. The following equations give the output current as determined by the low imped-
ance voltage source V
EXT
.
ANALOG PROGRAMMING, DIGITAL PROGRAMMING = 0:
Io =
[ (–1) (V
EXT
) x (10K/10K) x (–1) (10K/10K) x (–1/10) (10K/10K) ]/Rs
= (–1) (0.1/ Rs) x V
EXT
(mA d-c)
= –(0.1/Rs) x V
EXT
(mA d-c)
where
Rs =Internal shunt resistance (K-ohms), determined by Model (see Table 3-10).
(See above for definition of V
EXT
.)
ANALOG PROGRAMMING COMBINED WITH DIGITAL PROGRAMMING:
Io =
–(0.1/Rs) x V
EXT
– Iout
DP
(mA d-c)
where
Iout
DP
= Output current programmed digitally (from either local keypad or remote GPIB bus)
(See above for definitions of Rs and V
EXT
.)
3.8.4 PROGRAMMING WITH EXTERNAL VOLTAGE USING A HIGH IMPEDANCE, LOW LEVEL
(1V) VOLTAGE SOURCE
Figures 3-15 and 3-16 are simplified diagrams of the BHK-MG showing the jumper configuration
and external connections required for analog programming using a high impedance, low level
(1V), voltage source. Figure 3-15 shows the configuration for programming of either output volt-