Tegam 2348 Instruction Manual - User Manual

Full Text Searchable PDF User Manual

TEGAM, INC.

MODEL 2348

18.75 W Power Amplifier

This owner’s manual was as current as possible when this product was manufactured. However,
products are constantly being updated and improved. Because of this, some differences may occur

between the description in this manual and the product you received.

Instruction Manual

PN# 810049-CD

Publication Date: July 2006

REV. B

Table of Contents

PREPARATION FOR USE ..................................................................................

Unpacking

Inspection

........................................................................... 3

Optional

Accessories ............................................................................... 3

Safety

Information & Precautions ............................................................. 3

Terms in this Manual ......................................................................... 3

Terms as Marked on Equipment ........................................................... 3

Symbols

..........................................................................................

Grounding

the Equipment ................................................................... 4

Danger

Arising

from the Loss of Ground ............................................... 4

Use

the

Proper Fuse .......................................................................... 5

Do not Use in Explosive Environments .................................................. 5

not

Operate

without Covers ........................................................... 5

Servicing

Safety Summary ...................................................................... 5

not

Service Alone ......................................................................... 5

Use Care when Servicing with Power On ............................................... 5

Power

Source ................................................................................... 5

Power

Fuse Settings ............................................................................ 6

Important

Safety Information .................................................................. 7

INSTRUCTIONS FOR USE

............................................................................... 8

Intended

Use

......................................................................................... 8

Monitor

Outputs

.....................................................................................

Voltage

Current Limitations .................................................................. 8

Frequency

Characteristics

........................................................................ 8

Protection

Circuits .................................................................................. 8

Connections

..........................................................................................

III

INSTRUMENT DESCRIPTION

.......................................................................... 9

Instrument

Specifications ........................................................................ 9

Figure 1: No Load and Full Load Gain (dB) vs. Frequency ............................. 10

Figure 2: No Load and Full Load % Distortion (50 Vp-p) ............................... 10

SERVICE INFORMATION

................................................................................ 11

Warranty

.............................................................................................

Warranty

Limitations .............................................................................. 11

Statement

Calibration ......................................................................... 11

Contact

Information ............................................................................... 11

Equipment

Maintenance .......................................................................... 12

Repair

Parts .......................................................................................... 12

Preparation

for

Repair

or Calibration Service .............................................. 12

Expedite

Repair

Calibration Form ........................................................... 13

Power Amplifier Offset Gain Calibration Procedure ....................................... 14

APPENDIX

..................................................................................................... 16

Model 2348 Power Amplifier Instruction Manual

Preparation for Use

Unpacking & Inspection:

Each 2348 is put through a series of electrical and mechanical inspections before shipment from
the factory. Upon receipt of your instrument, unpack all of the items from the shipping carton and

inspect for any damage that may have occurred during transit. Report any damaged items to the
shipping agent. Retain and use the original packing material for reshipment if necessary.

Upon Receipt, inspect the carton for the following items:

1- Model 2348 Power Amplifier
1- Model 2348 User’s Manual, P/N 810049-CD

1- Power Cord, P/N 600014

Optional Accessories:

Rack Mount Kit, P/N 740532

BNC to BNC Cable, P/N CBL-3102
User Manual (Paper Copy), P/N 810049

Safety Information & Precautions:

The following safety information applies to both operation and service personnel. Safety
precautions and warnings may be found throughout this instruction manual and the equipment.

These warnings may be in the form of a symbol or a written statement. Below is a summary of
these precautions.

Terms in This Manual:

CAUTION statements identify conditions or practices that could result in damage to the equipment

or other property.

WARNING statements apply conditions or practices that could result in personal injury or loss of
life.

Terms as Marked on Equipment:

CAUTION indicates a personal injury hazard not immediately accessible as one reads the marking,

or a hazard to property including the equipment itself.

DANGER indicates a personal injury hazard immediately accessible as one reads the marking.

Model 2348 Power Amplifier Instruction Manual

Preparation for Use

Safety Information & Precautions Cont’d:

Symbols

As Marked in This Manual:

This symbol denotes where precautionary information may be found.

As Marked on Equipment:

Attention – Please refer to the instruction manual.

Danger – High or hazardous Voltage

Earth Ground Terminal

Off

Chassis Terminal

Alternating Current

Grounding the Equipment

This product is grounded through the grounding conductor of the power cord.

WARNING: To avoid electrical shock or other potential safety hazards, plug the power cord into a
properly wired receptacle before using this instrument.

The proper grounding of this instrument is essential for safety and optimizing instrument
operation.

Danger Arising from Loss of Ground

If the connection to ground is lost or compromised, a floating potential could develop in the

instrument. Under these conditions all accessible parts, including insulating parts such as keypads
and buttons could develop a hazardous voltage and put the user at risk.

Model 2348 Power Amplifier Instruction Manual

Preparation for Use

Use the Proper Fuse

To avoid fire hazard, use only the correct fuse type as specified for the AC power supply in this

manual. Please note that the fuse rating for 100/120-volt operation is different than the rating for
200/240-volt operation. Information about the proper fuse type is also printed on the rear panel of

the instrument.

Refer fuse replacement to qualified service personnel.

Do Not Use in Explosive Environments

WARNING: The 2348 is not designed for operation in explosive environments.

Do not Operate Without Covers

WARNING: This device should be operated with all panels and covers in place.

Operation with missing panels or covers could result in personal injury.

Outputs have the potential to deliver high voltage and the necessary

Precautions should be taken.

FOR QUALIFIED SERVICE PERSONNEL ONLY

Servicing Safety Summary:

Do Not Service Alone

Do not perform service or adjustment on this product unless another person capable of rendering
first aid is present.

Use Care When Servicing with Power On

Dangerous voltages may exist at several points in this product. To avoid personal injury or
damage to this equipment, avoid touching exposed connections or components while the power is
on. Assure that the power is off when removing panels, soldering, or replacing components.

Power Source

This product is intended to connect to a power source that will not apply more than 252V RMS
between the supply conductors or between either supply conductor and ground. A protective

ground connection by way of the grounding conductor in the power cord is essential for safe
operation.

Model 2348 Power Amplifier Instruction Manual

Preparation for Use

Power & Fuse Settings

CAUTION: DO NOT POWER THIS INSTRUMENT before verifying that the proper supply voltage

settings have been made.
Be sure that the instrument is unplugged. There are two separate settings that need to be verified.

Position the 2348 so that you are facing the rear panel and follow the instructions below:

Make sure that the supply voltage switch is set for either 110 or 220 V operation in the rear
panel. Then verify that the fuse rating is the correct value. The proper fuse rating is posted
next to the line voltage selection switch. First remove the power cord and then check the

fuse by taking a small straight edged screwdriver and inserting it into the fuse holder slot
located below the power cord socket. Use the screwdriver to gently pry the fuse drawer

until it slides out. Reinstall the fuse by simply pushing the fuse drawer back into its original
position. You will hear it snap into place.

Near the line voltage selection switch you will note another selection switch. This is the line
voltage compensation switch. Adjust the position of this switch to the closest position that

defines the actual line voltage. You may choose from LO line voltage (90-105/198-231V) or
HI line voltage (108-126/216-252V). Once the proper settings have been verified, you may
power the unit.

LINE VOLTAGE

SELECTION SWITCH

LOW OR HIGH VOLTAGE

SELECTION SWITCH

FUSE COMPARTMENT

Model 2348 Power Amplifier Instruction Manual

Preparation for Use

Important Safety Information

The chassis of the 2348 is grounded. The shields of the front panel BNC connectors are floating
from ground. A high impedance RC network (100k

in parallel with .1

F) is wired from the output

BNC connector shield to earth ground (Chassis). This provides a return path for leakage currents.

WARNING: DO NOT MODIFIY any configurations or connections from their original state otherwise

safe operation of this equipment may be compromised.

WARNING:
Always remember to shut off the power and wait at least 5 minutes before disconnecting or

connecting any cables or connections to or from the Model 2348. This warning also applies to any
instruments having an electrical connection of any kind to the Model 2348. This includes the signal
source, load, and all ground and shield connections. Ignoring this warning could result in electric

shock.

Model 2348 Power Amplifier Instruction Manual

Instructions for Use

Intended Use

The Model 2348 Amplifier is a single channel, Power Amplifier capable of both sourcing and sinking
current for a variety of loads including resistive and reactive loads. The 2348 amplifier is
compatible with most signal, pulse, function, and arbitrary waveform generators.

Monitor Outputs

The main output is accompanied by a monitor output. The monitor output is designed to provide
an accurate, low-voltage representation of the amplifier output at a scale of 100:1 when feeding

into a 1M

input and of 200:1 when feeding into a 50

input.

Voltage & Current Limitations

The input voltage of the 2348 amplifier ranges from ±2.5V peak. Exceeding this limit will result in
clipping and severe distortion at the amplifier’s output. The maximum output current is 750 mA.

The 2348 amplifier gain is set to +10 with no inversion.

Frequency Characteristics

The 2348 bandwidth from DC to 2MHz. The bandwidth of an amplifier decreases as the output

amplitude approaches the instrument’s maximum limits. There are figures in the specification
section of this manual that illustrate the frequency response, amplitude, output power and

distortion characteristics of the 2348.

Protection Circuits

The amplifier is protected in all operating modes with current limiting in either positive or negative
directions. There is also a built in thermal protection circuit for accidental overloads.

Connections

All connectors, input, output, and monitor are standard BNC connectors. There is a binding post
available on the instrument’s front panel to be used as a direct connection to the instrument’s

chassis. The monitor outputs may be connected to an oscilloscope, A/D card or other compatible
monitoring device to complete a closed loop system.

Model 2348 Power Amplifier Instruction Manual

Instrument Description

Instrument Specifications

Model 2348 Specifications

Electrical Specifications

Number of Channels

Input Impedance

Direct Coupled

Output Voltage Range

0 to ± 25 V Direct Coupled

Maximum Output Current

750 mA

Sine Wave Distortion (THD)

See Graph #1

Voltage Gain

+10 Fixed

Bandwidth

DC to 2 MHz, 50 Vp-p Full Load (-3dB)

Full Power Bandwidth

DC to 500 kHz / 50 Vp-p / 750 ma Sine - Typical (-0.4dB)

=33

)

Slew Rate

>200V/uSec

Square Wave Response (10%-90%) < 0.16

s for 35 Volt Step

=23

- Typical

Aberrations <

Voltage Monitor Output

Input Z (20:1 Ratio)

> 1 M

Input Z (10:1 Ratio)

Maximum Input Voltage

5 Vp-p

Safety

Conforms with IEC 61010-1, CE Marked

Environmental

Operating Temperature

0°C to +45°C, (32°F to 113°F) Ambient

Storage Temperature

-20°C to +50°C (-4°F to +122°F)

Humidity Range

< 80% RH Non-Condensing

General

Input Supply Voltage

110/220 50/60 Hz – Rear Panel Selectable

Power Rating

100 VA; 80 W

Dimensions: (H x W x L)

4.51”x10.14”x11.81” (11.5 x 25.8x30.0 cm)

Weight (approximate)

10 lbs (4.5kg)

Warranty

1 Year Parts & Labor

Standard Accessories

User’s Manual CD, Power Cord

Optional Accessories

Rack Mount Kit, P/N 740532
Standard BNC Cable, P/N CBL-3102

Model 2348 Power Amplifier Instruction Manual

Performance Characteristics

Figure 1: No Load and Full Load Gain (dB) vs. Frequency (Typical)

Amplifier Gain measured at 50 Vp-p

Bandwidth 2.0 MHz (-3 dB cutoff).

Frequency Response - 50Vpp

100

1000

10000

Frequency (kHz)

Gain (dB)

Figure 2: No Load and Full Load % Distortion 50 V p-p

NOTE: % distortion will decrease as the input voltage is reduced.

Distortion

0.5

1.5

2.5

100

1000

10000

Frequency (kHz)

% Distortion

Model 2348 Power Amplifier Instruction Manual

Service Information

Warranty:

TEGAM, Inc. warrants this product to be free from defects in material and workmanship for a
period of one year from the date of shipment. During this warranty period, if a product proves to

be defective, TEGAM Inc., at its option, will either repair the defective product without charge for
parts and labor, or exchange any product that proves to be defective.

TEGAM, Inc. warrants the calibration of this product for a period of 6 months from date of

shipment. During this period, TEGAM, Inc. will recalibrate any product, which does not conform to
the published accuracy specifications.

In order to exercise this warranty, TEGAM, Inc., must be notified of the defective product before
the expiration of the warranty period. The customer shall be responsible for packaging and

shipping the product to the designated TEGAM service center with shipping charges prepaid.
TEGAM Inc. shall pay for the return of the product to the customer if the shipment is to a location

within the country in which the TEGAM service center is located. The customer shall be responsible
for paying all shipping, duties, taxes, and additional costs if the product is transported to any

other locations. Repaired products are warranted for the remaining balance of the original
warranty, or 90 days, whichever period is longer.

Warranty Limitations:

The TEGAM, Inc. warranty does not apply to defects resulting from unauthorized modification or

misuse of the product or any part. This warranty does not apply to fuses, batteries, or damage to
the instrument caused by battery leakage.

Statement of Calibration:

This instrument has been inspected and tested in accordance with specifications published by

TEGAM Inc. The accuracy and calibration of this instrument are traceable to the National Institute
of Standards and Technology through equipment, which is calibrated at planned intervals by

comparison to certified standards maintained in the laboratories of TEGAM Inc.

Contact Information:

TEGAM INC.

10 TEGAM WAY
GENEVA, OHIO 44041

PH: 440.466.6100
FX: 440.466.6110

EMAIL:

sales@tegam.com

WEB:

http://www.tegam.com/

Model 2348 Power Amplifier Instruction Manual

Service Information

Equipment Maintenance

The cooling fan is designed for continuous operation. Periodically check the fan to make sure that

airflow is not impeded and that there is adequate ventilation to keep the instrument cool.

TEGAM recommends that the 2348 be calibrated and routine functional checks be performed on a
regular basis. The recommended interval is every twelve months. The actual interval is dependent
upon the application and is determined by your company’s Quality Assurance policy.

Repair Parts

The Model 2348 has no user replaceable parts.

Preparation for Repair or Calibration Service:

Once you have verified that the cause for 2348 malfunction cannot be solved in the field and the
need for repair and calibration service arises, contact TEGAM customer service to obtain an RMA,

(Returned Material Authorization), number. You can contact TEGAM customer service via the
TEGAM website,

www.tegam.com

or by calling 440.466.6100 (

All Locations

) OR 800.666.1010

(

United States Only

The RMA number is unique to your instrument and will help us identify your instrument and to
address the particular service request by you which is assigned to that RMA number. Of even

greater importance is a detailed written description of the problem that should be attached to the
instrument. Many times repair turnaround is unnecessarily delayed due to a lack of repair
instructions or of a detailed description of the problem.

This description should include information such as is the problem intermittent?, when is the

problem most frequent?, has anything changed since the last time the instrument was used?, Etc.
Any detailed information provided to our technicians will assist them in identifying and correcting

the problem in the quickest possible manner. Use the form provided on the next page.

Once this information is prepared and sent with the instrument and RMA number to our service
department, we will do our part in making sure that you receive the best possible customer
serviced and turnaround time possible.

Model 2348 Power Amplifier Instruction Manual

Service Information

Expedite Repair & Calibration Form

Use this form to provide additional repair information and service instructions. The Completion of

this form and including it with your instrument will expedite the processing and repair process.

RMA#:

Instrument Model #:

Serial

Number:

Company:

Technical Contact:

Phone Number:

Additional
Contact Info:

Repair Instructions:

Evaluation

Calibration Only Repair Only Repair & Calibration Z540 (Extra Charge)

Detailed Symptoms:

Include information such as measurement range, instrument settings, type of components being
tested, is the problem intermittent? When is the problem most frequent?, Has anything changed

with the application since the last time the instrument was used?, etc.

Model 2348 Power Amplifier Instruction Manual

Service Information

POWER AMPLIFIER OFFSET/GAIN CALIBRATION

Required Equipment:

Function Generator

Fluke 8842A – 5 1/2 digit Digital Multimeter or equivalent

BNC Splitter

WARNING: Servicing and calibration must be done by qualified service personnel.

WARNING: When disassembling the Amplifier for calibration, turn power OFF and disconnect the

power cord from the AC power source.

Remove the Amplifier’s front and back bezels by pulling out on the left or right side to
release the plastic from the metal sub panel. Rotate the released edge away from the

panel 1 to 2 inches and move the bezel toward unreleased side and remove.

Remove the 2 top and 2 bottom sheet metal screws from the 4 corners of the rear

panel.

Remove the 2 sheet metal screws from the 2 top corners of the front panel.

Carefully slide the rear panel out far enough so that the top cover can be grasped.

Then slide the top cover back 3 to 4 inches so the offset and gain access hole
adjustments at the front on the unit are visible. Refer to Figure 1

Before connecting the power cord to the Amplifier verify that all wiring is routed away
from metal surfaces.

Figure 1 – Power Amplifier Gain/Offset Adjustments

GAIN ADJUSTMENT

POTENTIOMETER

OFFSET ADJUSTMENT

POTENTIOMETER

Model 2348 Power Amplifier Instruction Manual

Service Information

POWER AMPLIFIER OFFSET/GAIN CALIBRATION Cont’d:

Figure 2 – Power Amplifier Offset/Gain Setup

DVM

FUNCTION

GENERATOR

AMPLIFIER

INPUT

OUTPUT

CH 1

Turn the 2348 power ON and allow for the 2348 to warm up for at least 15 minutes.

Verify that no instruments are connected to the Channel 1 or Channel 2 (

2350 only

) inputs.

Connect the DVM to Channel 1 OUTPUT and adjust the Channel 1 OFFSET potentiometer

0.0 ± 2 mVDC.

Apply a 4 Vpp (1.414 Vrms), 10 kHz, Sine wave to Channel 1 INPUT (with a BNC T-

connector). Measure and

[RECORD]

the AC voltage with the DVM connected to the other

end of the T-connector. Refer to Figure 2.

Multiply the recorded voltage from Step 9 by 10 and

[RECORD]

Connect the DVM to OUTPUT and adjust GAIN potentiometer for the recorded voltage from
Step 10 ± 0.05 Vrms.

Turn power OFF and disconnect the power cord from the AC power source.

Assemble the unit in the reverse order of disassembly.

Model 2348 Power Amplifier Instruction Manual

Appendix

There is currently no supplementary information available at this time.

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