Load Wiring Length For Operation With Sense Lines; Noise And Impedance Effects; Load Connections; Input Terminal - Ametek Amrel PLA Series Operation Manual

LOAD WIRING LENGTH FOR OPERATION WITH SENSE LINES

For applications that use remote sensing, you must limit the voltage drop across each source line. We recommend that
you use the larger load wirin g or ensure a smaller voltage d rop (1V typical max.) a long the wire, although the remote
sensing will compensate for voltage drops up to 1% of V
Max Rated Voltage
100 V
200 V
300 V
400 V
500 V
600 V
700 V
800 V
TABLE 2.5 VOLTAGE DROP COMPENSATION

NOISE AND IMPEDANCE EFFECTS

To minimize noise pickup or radiation, use shielded pair wiring or shortest possib le length for source wires. Connect the
shield to the chassis via a rear panel mounting screw. Where shieldin g is impossib le or impractical, simply twistin g the
wires together will offer some noise immunity. When using local sense connections, the user must use the largest
practical wire size to minimize the effects of load line impedance on the regulation of the load.

LOAD CONNECTIONS

The electronic load is designed with an air-cooling/water-coolin g system that provides airflow/water flow through the
heat sink to remove the heat generated by the Power M OSFETs. To obtain efficient heat exchange rate between heat sink
and power MOSFETs, the user needs to follow the instruction outlined belo w to ensure the heat is removed from heat
sink properly to prevent excess heat from accumulating in the po wer module. Under high power handling applications or
increased temperature operation, heat dissipation becomes a key factor in determining the reliability of the overall unit.

INPUT TERMINAL

WARNING
For the safety of personnel and to prevent electrical shock due to high voltage, do not come in contact or obstruct
the input terminals. Refer to the next page diagram, for the location of the input terminals.
WARNING
Never touch the input terminal when your hands are wet. Dry your hands first before operate the instrument.
Observe the maximum current handling capability of the power cables from DUT to the Load Bank. Please refer to Table
2.4 for higher current rating cables. Observe the maximum input current and voltage of the terminals. Do not underrate
the cable, excessive current will cause the temperature to increase and cause melting of the insu lation rubber of the
terminal and cable insulation sleeves resulting in input cable shorts.
For the high current applications, large diameter power cables are necessary to prevent load oscillation. The power cables
should be as short as possible to reduce inductance from the power cable and cause oscillation between power sources and
the load unit.
M470039-01 REV-F
in each line. Please see the following table:
MAX
Max Voltage Drop Compensation
1 V
2 V
3 V
4 V
5 V
6 V
7 V
8 V
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