KEPCO ATE-DMG SERIES - Manual (Page 31)

ATE-DMG 042314 2-7
7. Use number keys to enter rated maximum voltage (e.g. for ATE 25-40DMG, 25V is the rated
maximum voltage) and press ENTER. Output voltage will be displayed at bottom left of LCD.
8. Use

and

keys as necessary to adjust output precisely to rated maximum voltage. Ver-
ify DVM voltage reading agrees with displayed voltage on LCD within 0.01% of rated maxi-
mum (see associated instruction manual). If the LCD reads VsetMAX= (value), you are
entering a value higher than the maximum voltage setting; see PAR. 3.4.11.
2.6 INSTALLATION (Refer to Figure 1-2.)
The Power Supply is intended to be rack-mounted; the (4) bottom feet must be removed.
For all installations into confined spaces, care must be taken that the temperature immediately
surrounding the unit does not exceed the maximum specified ambient temperature (see Table
1-2).
2.6.1 GROUNDING
2.6.1.1 A-C (SAFETY) GROUND
The power supply is equipped with a 3-wire safety line cord and polarized plug. The third
(green) wire in the line cord is connected to the chassis and the case of the unit. If a 2-terminal
receptacle in combination with an adapter is used, it is imperative that the chassis of the power
supply be returned to a-c ground with a separate lead. A grounding terminal is provided (at the
rear barrier strip) for this purpose.
2.6.1.2 ISOLATION FROM GROUND.
The d-c output is isolated from the a-c source and from any direct connection to chassis or
ground. The maximum output voltage that can be supported between either output terminals
and chassis ground is 500V (d-c or peak). Either side of the output may be grounded.
A resistor/capacitor network is connected from the negative monitor terminal to the metal chas-
sis of the power supply. If this internal network is not desired, the connection to the chassis can
be opened by removing the link (8)-(9) on TB201 (see Figure 2-2).
2.7 FAST MODE CONVERSION OF THE ATE POWER SUPPLY
Power supplies designed to operate in a voltage, as well as in a current stabilizing mode, often
represent a compromise between the conflicting requirements of a good voltage and a good
current source. A good voltage source must have low output impedance, good output voltage
stability and good dynamic stability in the presence of loads with capacitive and/or inductive
content. It achieves these design goals by relying to a great extent upon a large output capacitor
having a very low terminal impedance, large energy storing ability and great resistance to rapid
voltage changes.
Unfortunately, the requirements for a good current source are quite opposite to that of the volt-
age source described above. A current source should have high output impedance and its ter-
minal voltage must be able to assume rapidly any value as may be needed to keep the output
current at the predetermined level, while the load is changing.
To satisfy these conflicting requirements, the ATE power supply was designed for quick manual
change-over from the “slow” mode to the “fast” mode of operation. In the “slow” mode, the ATE
power supply approaches an ideal voltage source. Heavy output and feedback capacitors pro-