KEPCO KT 3126-3130S Instruction Manual

I N S T R U C T I O N M A N U A L
KEPCO
GENERAL DESCRIPTION (Refer to Figures 1 and 2)
Kepco Model KT 3126-3130S and KT 3130-3131S Current Sensing Resistors are precision, wire-wound components
with low temperature coefficients and integral heatsink used for calibrating Kepco Power Supplies
MODEL
KT 3126-3130S
KT 3130-3131S
SENSING RESISTOR SELECTION
The value of the sensing resistor (R
ple is provided at the maximum output current (l
INSTALLATION
Refer to Figure 1 for Sense Resistor connections. The two sense resistors are mounted on a heat sink. If the actual
power dissipation (MAXIMUM OUTPUT CURRENT TIMES ONE VOLT) exceeds one-tenth of the power rating,
additional cooling by means of an air stream or an oil-bath should be provided to keep the heat-rise in the
sensing resistor to a minimum. To minimize output ripple ("pick-up") mount the sensing resistor assembly as close to
the power supply as practicable. Use shielded cable to connect the current control resistor to the null junction of the
power supply and connect the shield (single-ended) to the common signal ground.
INTERCONNECTIONS
The simplified connecting diagram (refer to Figure 2) shows the electrical connection of the Sensing Resistors to a typ-
ical Kepco Power Supply. The nomenclature used in the diagram coincides with that used on all Kepco Power Sup-
plies. Refer to your Kepco Instruction Manual when in doubt about interconnections or terminal designations.
CALIBRATION
The sense resistors are calibrated at Kepco. A label installed on the heatsink for RS1 and RS2 shows actual resistance
at various current ratings. For example, label for the 0.01 ohm resistor shows the calibrated resistance for operation
between 1A and 8A, between 8A and 15A, and between 15A and 25A. This means that if you are testing a 10 Ampere
power supply (e.g., BOP 20-10-4886) use the 0.01 ohm resistor and use the resistance recorded for between 8 and 15
Amperes.
KEPCO, INC.
©2011, KEPCO, INC
Data subject to change without notice
An ISO 9001 Company.
CURRENT SENSING RESISTORS
TABLE 1. KEPCO SENSING RESISTORS
RESISTANCE
(OHMS)
RS1 0.1
RS2 0.01
RS1 0.01
RS2 0.001
) is selected according to the desired output current range, such that a I-volt sam-
S
131-38 SANFORD AVENUE
http://www.kepcopower.com
RECOMMENDED OUT-
PUT CURRENT RANGE
TERMINATION
LOW HIGH
0.5A TO 20A
0.5A 8A
8A 25A
10A TO 100A
8A 25A
25A 100A
MAX):
O
1 Volt
R = ------------------- - (See Table 1 for values.)
S
I
Max.
O
FLUSHING, NY. 11355 U.S.A.
email: hq@kepcopower.com
228-1631 REV 1
SENSE RESISTOR
KT 3126-3130S
KT 3130-3131S
OUTLINE
DIMENSIONS
SCREW 8"L X 4.4"W X 1.75"H
SCREW 8"L X 4.4"W X 1.75"H
TEL (718) 461-7000 FAX (718) 767-1102
KT
1