KEPCO ATE-DMG User manual

©2016, KEPCO, INC 1
Data subject to change without notice 228-1768
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QUICK START GUIDE
KEPCO An ISO 9001 Company.
ATE-DMG
VOLTAGE/CURRENT STABILIZED
POWER SUPPLY
I — INTRODUCTION
1.1. SCOPE OF MANUAL. This Quick Start Guide
covers simple installation and local operation of the Kepco
ATE-DMG Series of 1000W voltage and current stabilized
d-c power supplies. Full specifications, features and
instructions are found in the associated Operator Manual
that can be downloaded free from the Kepco web site at:
www.kepcopower.com/support/opmanls.htm#ate-dmg
1.2. DESCRIPTION. The Kepco ATE-DMG with pro-
grammable overvoltage protector is a precision stabilized
power supply which can deliver either stabilized output volt-
age or current. The prevailing operating mode is indicated
by LED mode indicators on the front panel. Operating mode
crossover is automatic and may be monitored remotely by
commands provided via the GPIB port. A digital front panel
display shows the output voltage and output current. This
power supply has a linear and fully dissipative NPN pass
transistor section driven by high-gain, integrated circuit
amplifiers. The output of the power supply is fully program-
mable via either the GPIB port or the front panel keypad or
from an external analog reference when enabled from the
front panel menu. Terminals are also provided for remote
error sensing, as well as for the connection of the output
capacitor directly at the load.
The ATE-DMG power supply features user-selectable
“slow” or “fast” operating modes. Slow mode operation is
recommended for applications demanding a constant volt-
age source. Fast mode operation is best if the output volt-
age must change rapidly, either in response to an external
programming signal or, if the ATE-DMG is used as a cur-
rent stabilizer.
The ATE-DMG power supply is delivered for “slow mode”
operation. Refer to Operator Manual (see PAR. 1.1) for
converting the ATE-DMG power supply to “fast mode” oper-
ation.
A continuously adjustable overvoltage protection circuit is a
built-in feature. The trigger point of the overvoltage protec-
tor may be set (or checked) under actual operating condi-
tions by the front panel accessible setup controls.
Units are shipped for 115V a-c operation (105V to 125V
a-c), 47 to 63Hz. For operation at 104V a-c, 208V a-c or
230V a-c refer to the full Operator Manual (see PAR 1.1).
1.3. EQUIPMENT SUPPLIED.
• 115V a-c Line Cord terminated with NEMA 5-20P
plug.
1.4. ACCESSORIES (NOT SUPPLIED)
IEEE 488 Cables to connect ATE-DMG power supply to
GPIB bus (1, 2 or 4 meters long) are available. See Opera-
tor Manual for complete list of accessories.
II — SAFETY.
Exercise care in making all connections to and from the
ATE-DMG terminals. There are no operator serviceable
parts inside the case
WARNINGS
1. Remove a-c power from the ATE-DMG before making
any connections.
2. Wires and/or cables, connected from the ATE-DMG ter-
minals to external components or programming devices
must be properly insulated and securely terminated on
both sides to make accidental touch impossible.
3. The ATE-DMG chassis and cover must be safety-
grounded to a reliable a-c source ground. A safety-
ground may be established by using the power cord
supplied with a grounded a-c power outlet or, if the latter
is not available, by means of a separate wire, from the
provided GROUND terminal (at the rear barrier strip) to
a reliable a-c source ground point.

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FIGURE 1. FRONT PANEL CONTROLS AND INDICATORS
III — INSTALLATION
3.1. UNPACKING. The power supply has been thor-
oughly inspected and tested prior to packing and is ready
for operation. After careful unpacking, inspect for shipping
damage before attempting to operate. Perform the Prelim-
inary Checkout (PAR. 3.2). If any indication of damage is
found, file an immediate claim with the responsible trans-
port service
3.2. PRELIMINARY CHECKOUT. A simple oper-
ating check after unpacking and before permanent instal-
lation, is advisable to ascertain whether the ATE-DMG has
suffered damage in shipment.
1. Refer to Safety instructions (see Section II) and con-
nect unit to 115V a-c source; refer to Operator Manual
(see PAR 1.1) for different source voltage.
2. With POWER switch set to off position, connect the
power supply to source power.
3. With no load connected, set POWER switch to ON.
Each time the unit is turned on an internal self-test is
performed. If the test is successful the following indica-
tions are visible:
a. The alphanumeric display (LCD) indicates the
model and GPIB address.
b. After approximately 2 seconds, the display
changes to the power on default values: Local
mode, Constant Voltage (CV) mode, 0.000V,
0.000A, output disabled, command entry status
(see Figure 2).
FIGURE 2. LCD POWER ON DEFAULTS
A-C Power switch/
circuit breaker
Serves as a-c power switch
and turns a-c power off
upon overload or overvoltage
(hardware induced).
"V" Mode
indicator
Energizes in
Voltage Mode
"I" Mode
indicator
Energizes in
Current Mode
Keypad
Used for digital control of all local functions.
DISARM
pushbutton
Push to set
Crowbar
trigger level.
CROWBAR
indicator
Lights when
crowbar is
triggered ON.
LEVEL
control
Adjusts trigger
level of crowbar
circuit.
Liquid Crystal Display
(LCD) 2 x 16 character
display with LED backlight.
Shows mode (voltage/current),
settings, menu, program, etc.
Six keys with dual functions are
labeled with both a command and a
number.
The command label is referred to
when the unit is in command entry
status (indicated by blinking ":").
The number is referred to when the
unit is in data entry status (indicated
by blinking "=").
Note:
Loc CV
0.000A0.000V
NOTE: means blinking colon (:) indicating Command Entry status
means blinking equal sign (=) indicating Data Entry status

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020316 228-1768 3
c. Overcurrent and Overvoltage protection are set to
the maximum values (see Operator Manual, PAR.
1.1), but are not displayed.
NOTE: Six keys with dual functions are labeled with both a
command and a number. The command label is
referred to when the unit is in command entry
status; the number is referred to when the unit is
in data entry status.
4. Press OUTPUT ON/OFF key to enable the output.
5. Connect a digital voltmeter (DVM) to the (+) and (–) ter-
minals at the rear panel and verify DVM reads 0V.
6. Press V SET key. Verify bottom line of LCD reads Vset
nn (where nn = voltage setting).
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 pre-
cisely to rated maximum voltage. Verify DVM voltage
reading agrees with displayed voltage on LCD within
0.01% of rated maximum. If the LCD reads VsetMAX=
(value), you are entering a value higher than the
maximum voltage setting.
3.3. INSTALLING THE POWER SUPPLY. ATE-
DMG is intended to be rack-mounted; the four bottom feet
must be removed prior to installation. Refer to PAR. 3.5 for
cooling requirements.
3.4. CONNECTIONS. Connections are made using the
rear panel terminations (see Figure 4).
3.4.1. LOAD CONNECTION, GENERAL. Connect the
load between –OUT and +OUT output terminals at the rear
panel (see Figure 4. Sense connections are required,
either local or remote, must be used; otherwise the
unit will not operate.
See PAR. 3.4.2 for local sensing, see PAR. 3.4.3 for
remote sensing. “Fast” mode is recommended if step
changes in the load are expected: if, for example, the load
is rapidly changing in value, or if the power supply is pro-
grammed with step functions (square wave, pulse, etc.)
and maximum dynamic performance is expected. Set the
unit to “fast” mode by referring to the full Operator Manual
(see PAR. 1.1). Note that ripple in “fast” mode will be higher
than for the default “slow” mode.
Terminals on the barrier strip permit maximum flexibility in
power supply/load interface techniques. The unit is shipped
with several jumper links installed (see Figure 3) for the
default configuration: front panel (local) control of output
voltage, output current and VP crowbar level with the
power supply operating in the “slow” mode. Links on the
barrier strip must be tightened. CAUTION: Loose links at
the barrier strip will cause malfunction of the power
supply.
To configure the unit to allow remote programming of the
power supply or for “fast mode,” refer to the full Operator
Manual (see PAR. 1.1).
3.4.2. LOAD CONNECTION, LOCAL SENSING. Figure
3 illustrates load connection using local sensing. Refer to
the full Operator Manual (see PAR. 1.1) for load wire selec-
tion guidelines. The output power leads should be twisted
or tied together to reduce EMI.
FIGURE 3. LOCAL SENSING
3.4.3. LOAD CONNECTION, REMOTE SENSING. To
avoid excessive output effects at remote loads, remote
error sensing must be used (Kelvin connection). A pair of
wires (twisted to reduce EMI) connected from the sensing
terminals directly to the load will compensate for load wire
voltage drops up to 0.5 volt per wire (refer to Figure 4.
Observe polarities: the negative sensing wire must go to
the negative load wire, and the positive sensing wire goes
to the positive load wire.
If step changes in the load are expected (e.g., the load is
rapidly changing in value and maximum dynamic perfor-
mance is expected directly at the load terminals, refer to
the full Operator Manual (see PAR. 1.1) for alternative
remote sensing connections.
For large capacitive loads with long wire runs, refer to the
full Operator Manual (see PAR. 1.1) for techniques used to
reduce low frequency oscillations observed at the load.

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FIGURE 4. REAR PANEL TERMINATIONS
3.4.4. INPUT A-C CONNECTIONS. Install the line cord
(supplied) at the rear panel and connect to 115V a-c, 60Hz
(105V to 125V a-c, 50 to 65Hz) mains. Refer to the full
Operator Manual for operation at 104V a-c, 208V a-c or
230V a-c (see PAR. 1.1).
3.4.5. 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 pro-
vided (at the rear barrier strip) for this purpose.
3.4.6. ISOLATION FROM GROUND. The d-c output is
isolated from the a-c source and from any direct connec-
tion 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 nega-
tive monitor terminal to the metal chassis of the power
supply. If this internal network is not desired, the connec-
tion to the chassis can be opened by removing the link
(8)-(9) on the rear panel barrier strip TB201 (see Figure
4).
FIGURE 5. REMOTE SENSING
GPIB (IEEE 488)
Interface connector
Allows digital remote control
of power supply and provides
digital indication of status
and power supply output.
Interconnection Assembly
Used to gain access to
internal circuitry for fast mode
conversion, troubleshooting,
and parallel/serial connections.
Rear Panel Barrier Strip
Nine terminals provided:
Co (-) and Co (+) used to connect external output capacitor.
S (-) and S (+) used to connect external sensing leads.
M (-) and (+) used for output monitor connections.
GRD Ground terminal
GROUNDING NETWORK Used to connect or disconnect
internal grounding network
1, 7
2, 6
3, 5
4
8, 9
± Output terminals
Used to connect load.
FunctionTerminal
Source power
terminal block
(cover not shown)
Used to connect source
power; accepts 3-wire a-c
input cord (supplied).

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3.5. COOLING. The components in the ATE-DMG
power supply rely on forced air cooling. CAUTION: SIDE
PANEL AND REAR PANEL OPENINGS AND THE TOP
OF THE CASE MUST BE KEPT CLEAR FROM ALL
OBSTRUCTIONS TO ENSURE AIR CIRCULATION. Peri-
odic cleaning of the interior of the power supply is recom-
mended. When the ATE-DMG is rack-mounted or installed
into confined spaces, care must be taken that the ambient
temperature (the temperature immediately surrounding the
power supply) does not rise above 50°C (~122°F). Derate
power by 10% if ambient temperature exceeds 55°C
(~131°F).
IV — OPERATION
Turn the unit on using the front panel a-c POWER ON/OFF
switch/circuit breaker (see CAUTION, PAR. 4.3).
The ATE-DMG power supply is delivered for “slow mode”
operation (see PAR. 1.2). Refer to full Operator Manual
(see PAR. 1.1) for converting the ATE-DMG power supply
to “fast mode” operation.
4.1. OVERVOLTAGE CROWBAR SETUP AND
CHECK. The overvoltage crowbar circuit protects the load
from momentary or long-term overvoltages. The crowbar
SCR conducts across the power supply output, and the a-c
power switch/circuit breaker is tripped if overvoltages
occur. The front panel LEVEL control determines the
threshold between the actual operating voltage of the
power supply and the level at which the crowbar circuit will
be activated. The LEVEL control can be set from 3 volts to
110% of the rated output voltage. The LEVEL control may
be adjusted very close to the operating voltage (minimum
threshold = 2% of rated output voltage or 0.5 volt, which-
ever is greater). The operation of the crowbar circuit can be
checked as follows without actually triggering the crowbar.
All operating controls are accessible at the front panel (see
Figure 1).
1. Without connecting the load to the power supply turn
Crowbar LEVEL control fully clockwise.
2. Turn a-c POWER switch/circuit breaker on. Press
V SET key, then use the keypad to enter the desired
value at which the crowbar must trigger (NOT the actual
operating voltage), then press ENTER.
3. Depress the DISABLE button (and keep it depressed)
white turning the LEVEL control counterclockwise, until
the CROWBAR indicator energizes (simulated crowbar
action).
4. With the DISABLE button still depressed, press VSET
key, then use the keypad to enter the actual operating
voltage and press ENTER key. Release the DISABLE
button.
NOTE: This last adjustment established the threshold, i.e.,
the difference voltage between the output voltage
and the voltage at which the power supply will
crowbar. For minimum false triggering use the larg-
est threshold your load can tolerate.
5. To check the adjusted crowbar trigger level, depress
DISARM push button. Press V SET key, then use the
keypad to enter the voltage trip point, minus 1%, then
press ENTER.
6. Depress the key and note the voltage at which the
CROWBAR indicator lamp energizes. Correct LEVEL
adjustment as described above if necessary. Use
V SET to reduce power supply output voltage to its
operating value.
NOTE: Readjustment of the LEVEL control may be
required after load and power supply have reached
thermal equilibrium.
If an exact crowbar point at a remote load must be
established, remote error sensing, as described in
PAR. 3.4.3 must be used.
4.2. LOCAL MODE (KEYPAD) OPERATION. The
front panel keypad is comprised of 24 key, 13 dedicated to
command functions, 5 dedicated to data functions, and 6
keys that have both command and data functions When
the power supply is in command entry status the command
functions are effective; when the power supply is in data
entry status the data functions are effective.
4.2.1. COMMAND ENTRY STATUS. Indicated by a blink-
ing colon (:) on the bottom line of the LCD. The power sup-
ply is waiting for a command to be entered; data will not be
accepted (accompanied by brief audible buzz). The LCD
indicates the actual voltage and current at the output termi-
nals. When the output is disabled (LCD bottom line reads
Output OFF), the power supply is in Command entry sta-
tus even though the blinking colon is not visible.
NOTE: Blinking colon is indicated by in this manual.
4.2.2. DATA ENTRY STATUS. Entered automatically
when data entry required. Indicated by blinking equal sign
(=) on bottom line of LCD; the power supply is waiting for
data to be entered. A command will not be accepted
(accompanied by brief audible buzz). Enter new value (the

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key erases data entered). Press ENTER to accept new
setting, or CLEAR to exit without changing setting.
NOTE: Blinking equal sign is indicated by in this manual.
4.2.3. DISPLAY (LCD). The LCD is a 2-line display with a
capacity of 16 characters per line. The information is gen-
erally arranged as follows (information that does not follow
this format is self-explanatory): At top left: Loc/Rem indi-
cates Local or Remote status. At top right: CV/CC indi-
cates Constant Voltage or Constant Current mode. At
bottom left: n.nnnV indicates output voltage if in com-
mand entry or (parameter)(e.g. OVset if OV SET key
was pressed) if in data entry. Bottom middle shows
(blinking “:”) for command entry or (blinking “=”) for data
entry. At bottom right: n.nnnA indicates output current in
command entry, or, in data entry, n.nnn indicates the
present value of the parameter indicated at the bottom left
(the present value is replaced by data entered).
4.2.4. KEYPAD FUNCTIONS. (Refer to Figure 1.) Six
keys have dual functions, depending on whether the
power supply is in command entry status (waiting for a
command to be entered), or data entry status (waiting for
a number to be entered). Command entry status is
indicted on the LCD by a blinking colon and data entry
status is indicated by a blinking equal sign .
NOTE: Keys with dual functions are labeled with both a
command and a number. The command label is
referred to when the unit is in command entry
status; the number is referred to when the unit is
in data entry status.
OUTPUT ON/OFF - Command Entry active:
If bottom line of LCD reads Output OFF, press to
enable the output. If output is on (voltage and current
measurements displayed on bottom line of LCD), press to
disable the output.
V SET - Command Entry active:
Press to set output voltage. After V SET is pressed,
previous setting is displayed. Data entry required to enter
new value of output voltage; press ENTER to accept dis-
played value.
ISET - Command Entry active:
Press to set output current. After ISET is pressed,
previous setting is displayed. Data entry required to enter
new value of output current; press ENTER to accept dis-
played value.
LOCAL - Command Entry active:
If the power supply is in remote mode, keypad is dis-
abled except for LOCAL key. Press to enable keypad. If
LCD reads KEYPAD LOCKED, The LOCAL key is disabled
and can only be unlocked by remote operation.
RESET - Command Entry active:
Press to restore the power on default values: CV
mode, output voltage = 0, output current = minimum (1-
2% of IOmax), output enabled, overvoltage and overcur-
rent values. Also resets overvoltage or overcurrent condi-
tion.
MENU - Command Entry active:
Press to enter Menu commands: press repeatedly to
scroll through Menu functions: (1) set LCD contrast, (2)
GPIB address, (3) DCL Control, (4) Speaker on/off, (5)
Calibration password, (6) previous calibration values, (7)
factory calibration values, (8) view firmware serial number,
(9) set maximum voltage, (10) set maximum current, (11)
protection delay. Press ENTER or RESET to exit Menu.
OV SET / 7
Command Entry active: Press to set overvoltage
protection value. Data entry required to enter the overvolt-
age protection value; press ENTER to accept displayed
value.
Data Entry active: Press to enter number 7.
OC SET / 8
Command Entry active: Press to set overcurrent
protection value. Data entry required to enter new over-
current protection value; press ENTER to accept dis-
played value.
Data Entry active: Press to enter number 8.
CALIB / 9
Command Entry active: Press to enter Calibration
status. Requires password entry; instructions appear on
LCD.
Data Entry active: Press to enter number 9.
STORE - Command Entry active:
Press to store present values of output voltage and
current and overvoltage and overcurrent protection. Data
entry required to select memory location where values are
to be stored
EDIT PROG - Command Entry active:
Press to select the starting memory location to be
edited. Then use or to view or modify the parame-
ters of a specific memory location or to create a new pro-
gram.
STEP / 4
Command Entry active: Press to select starting
address of program to be executed one step at a time.
Data Entry active: Press to enter number 4.

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TIME / 5
Command Entry active: Press to edit time value for
specific memory location. Select memory location (data
entry), then enter time value, 0.01 to 2.5 seconds (data
entry).
Data Entry active: Press to enter number 5.
RUN / 6
Command Entry active: Press to run a program.
Requires data entry to select starting location. Press
ENTER to accept displayed value.
Data Entry active: Press to enter number 6.
RECALL - Command Entry active:
Press to recall previously stored values of output volt-
age and current, and overvoltage and overcurrent protec-
tion. Data entry required to select memory location
containing values to be recalled; press ENTER to accept
displayed value.
CLEAR - Data Entry active:
Press to exit Data Entry status; any numbers entered
are lost. Restores Command Entry status
1- Data Entry active:
Press to enter number 1.
2- Data Entry active:
Press to enter number 2.
3- Data Entry active:
Press to enter number 3.
ENTER - Data Entry active:
Press to accept data entered and return to Command
Entry status.

Command Entry active:
In CV (constant voltage), press to decrease output volt-
age by increment equal to voltage resolution (.0.025% of
EOmax).
In CC (constant current), press to decrease output cur-
rent by increment equal to current resolution (.0.025% of
IOmax).
In EDIT PROG status, changes the parameter dis-
played on LCD for a specific memory location and decre-
ments memory location displayed on LCD.
Data Entry active:
Erases number to left, or decreases value shown (e.g.
Display Contrast setting).
0- Data Entry active:
Press to enter number 0.
( . ) - Data Entry active:
Press to enter decimal point

Command Entry active:
In CV (constant voltage), press to increase output volt-
age by increment equal to voltage resolution (.0.025% of
EOmax).
In CC (constant current), press to increase output cur-
rent by increment equal to current resolution (.0.025% of
IOmax).
In EDIT PROG status, changes the parameter dis-
played on LCD for a specific memory location and incre-
ments memory location displayed on LCD
Data Entry active: Not used.
4.3. TURNING THE POWER SUPPLY ON Turn the
unit on using the front panel a-c POWER ON/OFF switch/
circuit breaker (see Figure 1). CAUTION: DO NOT repeat-
edly toggle the ON/OFF switch as this may cause unit
to fault. If actuator does not lock when released, wait a few
seconds before trying again. The circuit breaker is “trip-
free;” if overload exists, contacts cannot be held closed by
actuator.
When the power supply is turned on, the LCD first shows
the power supply type, e.g., Kepco ATE25-40 GPIB
addr. = nn, where nn is the GPIB address (factory
default GPIB address = 6). The LCD then shows the power
on defaults (see Figure 2). The defaults are: output
enabled, voltage mode, output voltage set to zero, output
current set to a minimum value (1-2% of IOmax). Power on
defaults also include setting maximum values for overcur-
rent and overvoltage protection listed in the full Operator
Manual (see PAR. 1.1).
When the power supply is turned on, it is automatically set
to Local mode. For remote operation, or to lock the keypad,
refer to the full Operator Manual (see PAR. 1.1).
4.3.1. LCD CONTRAST. If necessary the LCD contrast
can be adjusted by pressing MENU key once (with the
power supply in command entry status ). Then press 
or key to increase or decrease contrast for optimum
viewing. Press ENTER or CLEAR to exit menu.
4.3.2. AUDIBLE BEEPS. With the power supply in com-
mand entry status , press MENU key three times. The top
line indicates if the speaker is on or off (the factory default
setting is speaker on). Enter 1to enable the speaker, or 0

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to disable the speaker. Press ENTER or CLEAR to exit
menu.
4.3.3. ENABLING/DISABLING DC OUTPUT POWER.
When the power supply is turned on, the output is auto-
matically enabled, and the bottom line of the LCD gives
voltage and current measurements at the output. To dis-
able the output, press the red OUTPUT ON/OFF key; the
lower line of the LCD reads: Output OFF. When the out-
put is disabled, voltage and current are programmed to
zero; the power supply remains in Command Entry status.
Pressing the OUTPUT ON/OFF key again enables the
output: the previously programmed values of voltage and
current are restored and the LCD displays the mode (CV
or CC) and actual values of output voltage and current.
4.3.4. POWER SUPPLY RESET. Pressing the RESET
key overrides all other local commands to reset the power
supply to the power on defaults: output enabled, voltage
mode, output voltage set to zero, output current set to a
minimum value (1-2% of IOmax), overcurrent and over-
voltage protection set to the maximum values. The power
supply remains in command entry status.
4.4. SET OUTPUT VOLTAGE OR CURRENT.
V SET and ISET set output voltage and current limit,
respectively, when the unit is in constant voltage (CV)
mode and set voltage limit and output current, respec-
tively, when the unit is in constant current (CC) mode. The
mode (CV or CC) is determined by the load together with
the programmed settings. As long as the voltage across
the load produces a current that is less than or equal to
the ISET value, the unit operates in CV mode (voltage
programmed to V SET value, current limited by ISET
value). If the load changes to the point that current
through the load reaches the ISET value, the unit auto-
matically enters CC mode (current programmed to ISET
value, voltage limited by V SET value).
With the power supply in command entry status , press
V SET (voltage) or ISET (current) key to put the power
supply in data entry status . The lower right side of the
LCD shows the programmed setting in effect when the
key is pressed. Press ENTER or CLEAR to exit without
changing setting. Enter new value (the key erases
data just entered) and press ENTER to accept new setting
or CLEAR to exit without changing setting.
With the power supply in command entry status , an
alternative is to use (increase) or key (decrease) to
change the output by the minimum increment (.0.025%
of EOmax for voltage, .0.025% of IOmax for current). In
CC mode, these keys control output current; in CV mode
they control output voltage. The key has no effect after
the maximum (or programmed limit) has been reached.
The key has no effect when the value is 0.
If the value entered exceeds the maximum setting, the
LCD bottom line flashes VsetMAX=nn V or Iset-
MAX=n.n A where n.n is the maximum setting (refer to
full Operator Manual to change this setting). The unit
returns to waiting for a value that does not exceed the
maximum.
When voltage is changed, the unit shows CC (current
mode) on the display while the output filter capacitor is
charging. This can be tens of seconds if ISET is pro-
grammed to less than 10% of full scale current.
4.5. SETTING OVERVOLTAGE OR OVERCUR-
RENT PROTECTION. With the power supply in com-
mand entry status , press OV SET (overvoltage) or OC
SET (overcurrent) to put the power supply in data entry
status . The lower right side of the LCD shows the pro-
grammed setting in effect when the key is pressed. Press
ENTER or CLEAR to exit without changing setting. Enter
new value and press ENTER to accept new setting (the
key erases data just entered), or CLEAR to exit with-
out changing setting. To recover from overvoltage or over-
current condition, press RESET; this restores the power
on defaults (see PAR. 4.3.4).
Overvoltage and overcurrent settings are recommended
to be left set to the factory default values or should be at
least 1% higher than the expected output voltage or out-
put current.
4.6. ADDITIONAL FEATURES. The following fea-
tures of the ATE-DMG power supply are covered in the full
Operator Manual (see PAR. 1.1).
• “Fast” Mode configuration and operation
• Configuring input voltage of 104, 208 or 230V ac
• Changing the Protection Delay
• Changing Maximum Voltage or Current Value
• Storing/Recalling Power Supply Output Settings
• Enabling Remote Analog Control
• Local Mode Programming Using 40 Memory
Locations
• Remote Analog Programming
• Digital Mode remote Programming
• Calibration