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MODIFICATION OF STANDARD
KEPCO®
KEPCO MODEL BOP 50-4MC
KEPCO MODEL BOP 50-4DC
THE POWER SUPPLIER™
The Kepco Models BOP 50-4MC and BOP 50-4DC have been modified from standard Kepco
Models BOP 50-4M and BOP 50-4D, respectively, to be stable handling capacitive loads up to
10 mF.
INSTRUCTION MANUAL CORRECTIONS:
This modification makes the BOP more suitable for a wide variety of applications such as
solar cell/ solar panel testing, piezoelectric device driving/ testing, capacitor testing, capacitive
transducer driving/testing and powering industrial or lab-type applications for capacitive or
capacitive-resistive loads.
Static specifications representing the unit’s accuracy in Voltage mode are identical with the
standard BOP models, while the ripple and noise specifications are better (approximately 50%
lower) for MC and DC models than standard BOP models.
Specifications listed in Table 1 are for BOP 50-4MC and BOP 50-4DC in Voltage Mode.
TABLE 1. BOP 50-4MC AND BOP 50-4DC SPECIFICATIONS
Bandwidth (DC to f-3dB)
Resistive Load, Nominal Capacitive Load, 10µF
11.5 kHz 15 kHz 35 µS100 µS
NOTES:
(1) Nonuniformities of the frequency response for the standard 10µF load create a larger 3-dB bandwidth than
for the resistive load.
(2) 10% to 90%, with nominal resistive load.
(3) Load between infinity and nominal resistive load values.
(1)
Rise/Fall Time
(2)
Recovery at Step Load
(3)
In voltage mode the bandwidth of the BOP 50-4MC and DC models is less than the standard
BOP, while the response time is increased. Nonuniformities of the frequency response can be
nearly eliminated by reducing the bandwidth in Voltage mode. Bandwidth can be reduced in a
predictable manner by increasing the internal compensation capacitance by placing an external
capacitor in parallel across C21 of Assembly A1 (see Table 2 and Figure 1).
TABLE 2. BANDWIDTH CORRECTION
EXTERNAL CAPACITOR
(ACROSS A1C21, SEE FIGURE 1)
1 nF 2.2 nF 4.7 nF 15 nF 33 nF 47 nF 100 nF
CORRECTED BANDWIDTH 11 kHz 9 kHz 7 kHz 3 kHz 1.5 kHz 1 kHz 0.5 kHz
NOTE: Listed bandwidth correction values are for Voltage mode, nominal resistive load.
BOP 50-4MC/DC/-r2 031512
KEPCO, INC. z 131-38 SANFORD AVENUE z FLUSHING, NY. 11355 U.S.A. z TEL (718) 461-7000 z FAX (718) 767-1102
email: hq@kepcopower.com z World Wide Web: http://www.kepcopower.com
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In Current Mode the dynamic specifications are almost identical for all BOP MC and DC
models: 3-dB bandwidth of 4.9kHz and rise/ fall time of 72µs (lower bandwidth and higher rise/
fall time than the standard BOP M and D models).
FIGURE 1. ASSEMBLY A1, EXTERNAL BANDWIDTH CORRECTION CAPACITOR LOCATION
2 BOP 36-6MC/031512
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