BHK-1/2-MG 030916
3-37
NOTE: Output voltage is referenced to +OUT and output current is negative lOUT ter-
minal. This convention applies to voltage and current programming calculations of
PAR. 3.8
3.8.2.2
CURRENT MODE
With the power supply in current mode (see Figure 3-10) and the digitally programmed output
voltage at zero, varying the external resistor from 0 to 10K causes the output current of the
power supply to vary linearly from 0 to I
O
max with a slope of (0.0001 x I
O
max) mA per ohm. The
following equation gives the output current as determined by external resistance R
EXT
.
Io =
[ (–1) (10V) x (R
EXT
/10K) x (–1) (10K/10K) x (–1/10) (10K/10K) ]/Rs
=
(–1) (0.1/ Rs) x R
EXT
=
(–0.1/Rs) x R
EXT
(mA d-c)
where
Rs = Internal shunt resistance (K-ohms), determined by Model (see Table 3-10).
(See above for definition of R
EXT
.)
3.8.3
PROGRAMMING WITH EXTERNAL VOLTAGE USING A LOW IMPEDANCE VOLTAGE
SOURCE
Figures 3-11 through 3-14 are simplified diagrams of the BHK-MG showing the jumper configu-
ration and external connections required for analog programming using a low impedance volt-
age source. Figure 3-11 shows an isolated voltage source, Figure 3-12 shows a grounded
voltage source for programming of either output voltage when the unit is in voltage mode, or
voltage limit when the unit is in current mode. Figures 3-13 (isolated voltage source) and 3-14
(grounded voltage source) are similar diagrams for programming either output current when the
unit is in current mode, or current limit when the unit is in voltage mode.
The external voltage source is applied to the input of the uncommitted amplifier which is config-
ured either as an inverting repeater (Figures 3-11 and 3-13) for isolated voltage sources or a dif-
ferential amplifier having a gain of –1 (Figures 3-12 and 3-14) for grounded voltage sources.
The positive voltage is applied to the inverting input of the uncommitted amplifier referenced to
internal signal ground. The voltage source impedance should be low compared to the 10K input
impedance into the programming terminals of the power supply.
CAUTION
Observe the following to avoid damage to the power supply.
For isolated voltage sources
(Figures 3-11 and 3-13), the external voltage source output must be isolated from ground (float-
ing output), or be powered from an a-c source that is isolated from ground to avoid short-circuit-
ing the internal sensing resistor,. If neither of these options are practical, use the grounded
voltage source configurations shown in Figures 3-12 and 3-14.
Содержание BHK-MG Series
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Страница 18: ...xii BHK MG030916 FIGURE 1 1 BHK MG 40W SERIES PROGRAMMABLE POWER SUPPLY...
Страница 24: ...1 6 BHK 1 2 MG OPR 030916 FIGURE 1 2 BHK 40W SERIES POWER SUPPLY MECHANICAL OUTLINE DRAWING SHEET 1 OF 2...
Страница 25: ...BHK 1 2 MG OPR 030916 1 7 FIGURE 1 2 BHK 40W SERIES POWER SUPPLY MECHANICAL OUTLINE DRAWING SHEET 2 OF 2...
Страница 26: ...1 8 BHK 1 2 MG OPR 030916 FIGURE 1 3 RA 24 RACK ADAPTER WITH TWO 1 2 RACK BHK MG 40W UNITS...
Страница 35: ...BHK 1 2 MG SERIES 030916 2 3 FIGURE 2 2 BHK MG SERIES REAR PANEL CONTROLS AND CONNECTIONS...
Страница 100: ...3 54 BHK 1 2 MG 030916 FIGURE 3 20 SERIES AUTOMATIC CONFIGURATION...
Страница 108: ...3 62 BHK 1 2 MG 030916 FIGURE 3 23 PARALLEL AUTOMATIC CONFIGURATION Eo is the output voltage of the power assembly...
Страница 113: ...BHK 1 2 MG 030916 3 67 FIGURE 3 25 PARALLEL MASTER SLAVE CURRENT MODE CONFIGURATION...
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