Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 2304 2304_903_01A

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M O D E L 2 3 04

QuickStart
HIGH
2304
U S E R ' S

SPEED
G U I D E

PRECISION
READBACK
POWER SUPPLY
Safety Precautions
The following safety precautions should be observed before using this
product and any associated instrumentation. Although some instruments and
accessories would normally be used with non-hazardous voltages, there are situa-
tions where hazardous conditions may be present.
This product is intended for use by qualified personnel who recognize
shock hazards and are familiar with the safety precautions required to avoid possi-
ble injury. Read the operating information carefully before using the product.
Exercise extreme caution when a shock hazard is present. Lethal voltage
may be present on cable connector jacks or test fixtures. The American National
Standards Institute (ANSI) states that a shock hazard exists when voltage levels
greater than 30V RMS, 42.4V peak, or 60VDC are present. A good safety practice is to
expect that hazardous voltage is present in any unknown circuit before measuring.
As described in the International Electrotechnical Commission (IEC)
Standard IEC 664, digital multimeter measuring circuits (e.g., Keithley Models 175A,
199, 2000, 2001, 2002, and 2010) measuring circuits are Installation Category II. All
other instruments' signal terminals are Installation Category I and must not be con-
nected to mains.
Before operating an instrument, make sure the line cord is connected to a
properly grounded power receptacle. Inspect the connecting cables, test leads, and
jumpers for possible wear, cracks, or breaks before each use.
For maximum safety, do not touch the product, test cables, or any other
instruments while power is applied to the circuit under test. ALWAYS remove power
from the entire test system and discharge any capacitors before: connecting or dis-
connecting cables or jumpers, installing or removing switching cards, or making
internal changes, such as installing or removing jumpers.
Do not touch any object that could provide a current path to the common
side of the circuit under test or power line (earth) ground. Always make measure-
ments with dry hands while standing on a dry, insulated surface capable of with-
standing the voltage being measured.
The symbol on an instrument indicates that the user should refer to
the operating instructions located in the manual.
The symbol on an instrument shows that it can source or measure
1000 volts or more, including the combined effect of normal and common mode
voltages. Use standard safety precautions to avoid personal contact with these
voltages.
The WARNING heading in a manual explains dangers that might result in
personal injury or death. Always read the associated information very carefully
before performing the indicated procedure.
The CAUTION heading in a manual explains hazards that could damage
the instrument. Such damage may invalidate the warranty.
Instrumentation and accessories shall not be connected to humans.
Before performing any maintenance, disconnect the line cord and all
test cables.
HIGH SPEED PRECISION READBACK POWER SUPPLY

This guide is designed to familiarize users of the Keithley Model 2304 High
Speed Power Supply with the basic operating features available from the instru-
ment's front panel and via the GPIB Bus. The sequence of instructions reflects the
order in which the instrument would be configured for a typical application. As
users become more familiar with the Model 2304, it may not be necessary to follow
this sequence so strictly. For each Model 2304 operating mode, an example set of
bus commands is provided. For a reading to be performed and returned via the bus,
the :read? command must be sent after the instrument is configured to the desired
mode. While the SCPI command strings are generic, the exact programming syntax
will depend on the programming language used in the test environment.

LOCAL
2304 HIGH SPEED POWER SUPPLY
MENU OPERATE

DISPLAY

ENTER SET

POWER

Figure 1. Model 2304 front panel

The Model 2304 has three operating (display) modes:

> ACTUAL V AND I -- This mode reads back the actual output voltage
and current. The instrument defaults to this mode at power up.

> DVM INPUT -- This mode displays the DC voltage applied to the
power supply's DVM input.

> PULSE CURRENT -- This mode is used to display high, low, or average
pulse-current measurements or to return up to 5000 measurements
from the measurement buffer, i.e., for digitizing a current waveform.

Setting the output voltage and current limit:
1
Output voltage can be set from 0 to 20V. There are two ranges for current
output -- 5A and 5mA. The current range can be checked or changed using the
CURRENT RANGE selection of the MENU.

3
MODEL 2304

1. Press the SET key to select the Output Settings Mode. A blinking cursor
will appear in the voltage field of the display.

2. Use the , , , buttons to key in the desired output voltage
value, then press SET. The blinking cursor will move to the current field
of the display.

3. Use the , , , buttons to key in the desired current limit, then
press SET to exit the Output Settings Mode. The display will return to
the actual V and I display mode.

GPIB commands for setting the output voltage and current limit:

:source:voltage xx.xxx ; set output voltage,
xx.xxx is between 0 and 20

:source:current:limit x.xxxx ; set output current limit,
x.xxxx is between 0 and 5

and

:sense:current:range minimum ; set to 5 mA range

:sense:current:range maximum ; set to 5 A range

Turning supply output on/off
2
The output of the Model 2304 is turned on and off using the front panel
OPERATE button. The word "ON" appears on the display when the output is turned
on. When the output is turned off, "OFF" is displayed.

GPIB commands for turning the supply output on/off:

:output on ; turn the supply output on

:output off ; turn the supply output off

4
HIGH SPEED PRECISION READBACK POWER SUPPLY

Selecting the operating (display) mode:
3 Actual V and I Mode:
This mode sets the instrument to display steady-state readback current
and voltage and to return current or voltage measurements over the GPIB bus. If
using the front panel controls, press the DISPLAY button and select the "Actual V
and I" mode using the and buttons.

GPIB1,2 commands for selecting the Actual V and I mode:

:sense:function "voltage" ; selects voltage
measurement function

:sense:average xx ; the number of readings to
average per measurement, up
to 10 (optional command)

:sense:function "current" ; selects current
measurement function

:sense:average xx ; the number of readings to
average per measurement, up
to 10 (optional command)

WARNING:NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.

LINE FUSE
ISOLATION FROM EARTH: SLOWBLOW
22 VOLTS MAX. 2.5A, 250V
LINE RATING
100-240VAC
50, 60 HZ
+ + + _ _ _ _ + 185VA MAX
SOURCE SENSE SOURCE DVM IN

OUTPUT
0-20V, 0-5A

IEEE-488 REMOTE
(CHANGE IEEE ADDRESS
WITH FRONT PANEL MENU) DISPLAY
OPTION

MADE IN
U.S.A.

CAUTION:FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.

Figure 2. Rear panel of the Model 2304. Note the location of the digital voltmeter
inputs.

5
MODEL 2304

External
Quick Test
Disconnect Circuitry
Connector
+
DVM DVM +
Input

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