KEPCO BOP 72-6DC Modification Sheet

MODIFICATION OF STANDARD

KEPCO®

KEPCO MODEL BOP 72-6MC
KEPCO MODEL BOP 72-6DC

THE POWER SUPPLIER™

The Kepco Models BOP 72-6MC and BOP 72-6DC have been modified from standard Kepco
Models BOP 72-6M and BOP 72-6D, 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 72-6MC and BOP 72-6DC in Voltage Mode.

TABLE 1. BOP 72-6MC AND BOP 72-6DC SPECIFICATIONS

Bandwidth (DC to f-3dB)

Resistive Load, Nominal Capacitive Load, 10µF

7.1 kHz 13 kHz 60 µS 170 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 72-6MC 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 7.2 kHz 6.5 kHz 5.8 kHz 3 kHz 1.5 kHz 1 kHz 0.5 kHz

NOTE: Listed bandwidth correction values are for Voltage mode, nominal resistive load.

BOP 72-6MC/DC-r2/031512

KEPCO, INC. z 131-38 SANFORD AVENUE z FLUSHING, NY. 11355 U.S.A. z TEL [phone] z FAX [phone]

email: [e-mail] z World Wide Web: http://www.kepcopower.com

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 72-6MC/031512