KEPCO BOP-HV - Manual (Page 15)

BOPHV112211
1-3
NOTE: In this instruction manual, Kepco will follow the NEMA standards for d-c Power Supplies
and speak of the “Output Effects,” caused by changes in the “Influence Quantities.” The
“Output Effects” are specified either as a percentage change, referred to the maximum
specified output voltage (E
O
) or current (I
O
), or as an absolute change ( ∆E
O
, ∆I
O
), directly in
millivolts or milliamperes or both. The illustration below will clarify the NEMA terms.
1) DUE TO SOURCE = SOURCE EFFECT....................................................................( FORMERLY LINE REGULATION)
2) DUE TO LOAD = LOAD EFFECT .........................................................................( FORMERLY LOAD REGULATION)
3) DUE TO TEMPERATURE = TEMPERATURE EFFECT COEFFICIENT ...............................( FORMERLY TEMPERATURE COEFFICIENT)
4) DUE TO TIME = DRIFT........................................................................................( FORMERLY STABILITY)
D) The BOP output effects, in response to the tabulated variation in the INFLUENCE QUAN-
TITIES, are given in Table 1-2 for the built-in input and feedback resistor values of the volt-
age and current channel preamplifiers.The tabulated OFFSET values (see Table 1-2) may
be used to calculate the BOP output effects if the BOP voltage or current channel is
remotely programmed and different values for the feedback resistors (Rf) and the input
resistors (Ri) are used. In this case, the tabulated preamplifier offsets and the values of the
feedback and input resistors are combined in an “Error Equation”, which represents the
“Worst Case” output effect for the application at hand:
VOLTAGE MODE: ∆ E
O
= G [± ∆ E
io
(1 + R
f
/R
i
) ± ∆ I
io
R
f
± ∆ E
ref
]
CURRENT MODE: ∆ I
O
= [± ∆ E
io
(1 + R
f
/R
i
) ± ∆ I
io
R
f
± ∆ E
ref
]
R S = C URRENT S ENSING R ESISTOR (BOP 500M = 12.5 Ω , BOP 1000M = 25 Ω )
∆I
O
=T OTAL O UTPUT C URRENT C HANGE
G = C LOSED L OOP G AIN (BOP 500M = 50, BOP 1000M = 100)
WHERE : ∆ E
O
= T OTAL O UTPUT V OLTAGE C HANGE
∆ E
ref
= C HANGE IN THE V OLTAGE R EFERENCE
∆ E
io
= C HANGE IN O FFSET V OLTAGE
∆ I
io
= C HANGE IN O FFSET C URRENT
R
f
= E XTERNAL F EEDBACK R ESISTOR
R
i
= E XTERNAL I NPUT R ESISTOR
NOTE: Variations in the value of the feedback and input resistors are considered secondary effects in the
Error Equation.
INFLUENCE QUANTITIES
1) SOURCE
2) LOAD
3) TEMPERATURE
4) TIME
1
10xR s
-----------------
1
10xR s
-----------------