Tektronix CDC250 User Manual

User Manual

Tek(ronix

CDC250

175 MHz Universal Counter

070-7999-02

User Manual

Tek(ronix

CDC250

175 MHz Universal Counter

070-7999-02

Tektronix products are covered by U.S. and foreign patents, issued and

pendihg. Information in this publication supercedes that in all previously

published material. Specifications and price change privileges reserved.

WARRANTY

Tektronix warrants that this product will be free from defects in materials and

workmanship for a period of one (I ) year from the date of shipment. If any such product

proves defective during this warranty period, Tektronix, at its option,`either will repair the

defective product without charge for parts and labor, or will provide a replacement in

exchange for the defective product.

Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070-1000

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

In order to obtain service under this warranty, Customer miist notify Tektronix of the defect

before the expiration of the warranty period and make suitable arrangements for the

performance of service. Customer shall be responsible for packaging and shipping the

defective product to the service center designated by Tektronix, with shipping charges

prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to

a location within the country in which the Tektronix service center is located. Customer

shall be responsible for paying all shipping charges, duties, taxes, and any other charges for

products returned to any other locations.

This warranty shall not apply to any defect, failure or damage caused by improper use or

improper or inadequate maintenance and care. Tektronix shall not be obligated to furnish

service under this warranty a) to repair damage resulting from attempts by personnel other

than Tektronix representatives to install, repair or service the product; b) to repair damage

resulting from improper use or connection to incompatible equipment; or c) to service a

product that has been modified or integrated with other products when the effect of such

modification or integration increases the time or difficulty of servicing the product.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THIS

PRODUCT IN LIEU 0F ANY OTHER WARRANTIES, EXPRESSED OR

IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIHD

WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR

PURPOSE. TEKTRONIX' RESPONSIBILITY TO REPAIR OR REPLACE

DEFECTIVE PRODUCTS IS THE SOLE AND EXCLUSIVE REMEDY

PROVIDED TO THE CUSTOMER FOR BREACH 0F THIS WARRANTY.

THKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY

INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES

IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS

ADVANCE NOTICE 0F THE POSSIBILITY OF SUCH DAMAGES.

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Table of Contents

General Safety Summary

Getting Started .....................................

Preparing the CDC250175 MHz Universal Counter for Use . .

Front Panel .............................,...........

Rear Panel .........................................

Reference......

General Considerations ...........

Duty Cycle Measurements ......

PERIOD vs. TIME Interval Mode

Using TRIG LEVEL Control ....

Display Interpretation ............

Display Instability ............

Measurement Delays ..........

Intermeasurement Interval ......

Measurements..................

Frequency Measurements ......

Period Measurements ..........

Frequency Ratio Measurements . .

Time Interval Measurements ....

Totalize Measurements ........

Checking Instrument Operation . .

Appendix A: Specifications ........................... 27

Appendix 8: Maintenance ...........................

Cleaning...........................................

Preparing for Shipment ...............................

Troubleshooting....,................................

No Display with Power On .........................

Display On but Frequency Not Counted ...............

Appendix C: Replaceable Parts .......................

Standard Accessories .................................

Optional Accessories .................................

34 34

37 37

CDC250 User Manual

Table of Contents

List of Tables

Table 1: Gate Time and Measurement Resolution in Frequency

Mode,..,......................................

Table 2: Gate time, Resolution and Cycles Averaged in Period

and Time Modes ................................

Table 3: GATE Setting and CHANNEL 8 Counts .......

Table 4: CHECK Mode Displays ......................

Table 5: Operational

Table 6: Physical Characteristics .....................

Table 7: Environmental Characteristics ...............

Table 8: Electrical Characteristics ....................

Table 9: Standard Accessories ........................

Table 10: Optional Accessories .......................

Table 11 : Accessory Power Cords .....................

General Safety Summary

Review the following safety precautions to avoid injury and prevent

Injury Precautions

damage to this product or any products connected to it.

Use Proper Power Cord To avoid fire hazard, use only the power cord specified for this

product.

Avoid Electric Overload

To avoid electric shock or fire hazard, do not apply a voltage to a

terminal that is outside the range specrified for that terminal.

Ground the Product

This product is grounded through the grounding conductor of the

power cord. To avoid electric shock, the grounding conductor must

be connected to earth ground. Before making connections to the

input or output terminals of the product, ensure that the product is

properly grounded.

CDC250 User Manual

Do Not Operate Without Covers

To avoid electric shock or fire hazard, do not operate this product

with covers or panels removed.

Use Proper Fuse

To avoid fire hazard, use only the fuse type and rating specified for

this product.

CDC250 User Manual

General Safety Summary

Do Not Operate in Wet/Damp Conditions

To avoid electric shock, do not operate this product in wet or damp

conditions.

Do Not Operate in Explosive Atmosphere

To avoid injury or fire hazard, do not operate this product in an

explosive atmosphere.

Product Damage Precautions

Use Proper Power Source

Do not operate this product from a power source that applies more

than the voltage specified.

Use Proper Voltage Setting

Before applying power, ensure that the line selector is in the proper

position for the power source being used.

Provide Proper Ventilation

To prevent product overheating, provide proper ventilation.

Do Not Operate With Suspected Failures

If you suspect there is damage to this product, have it inspected by

qualified service personnel.

Safety Terms and Symbols

Terms in This Manual

These terms may appear in this manual:

WARNING. Warning statements identify conditions or practices that

A A

could result in injury or loss Of life.

CAUTION. Caution statements identify conditions or practices that

could result in damage to this product or other property.

Terms on the Product

These terms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you

read the marking.

WARNING indicates an injury hazard not immediately accessible as

you read the marking.

CAUTION indicates a hazard to property including the product.

Symbols on the Product

The following symbols may appear on the product:

©A

DANGEPI Protective Ground ATTENTloN

High voltage (Earth) Terminal Plefer to

CDC250 User Manual

Manual

General Safety Summary

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Certifications and Compliances

CSA Certified Power Cords

CSA Certification includes the products and power cords appropriate

for use in the North America power network. All other power cords

supplied are approved for the country of use.

Getting Started

The Tektronix CDC250175 MHz Universal Counter counts the

signal frequency of sine, square, and triangle waves from 5 Hz to 175

MHz. An eight-digit display with automatic decimal point placement

and an LED indicator shows the display measurement unit. In

addition to frequency measurements, the frequency counter provides

the following measurement functions:

I Period measurements in microseconds or milliseconds over a

5 Hz to 2 MHz range

I Frequency ratio measurements comparing two input signals

I Time interval measurements from a selected edge of one input

signal to a selected edge of another

I Totalize measurements for counting individual events

The CDC250 has a locking, multiposition handle that folds under the

instrument to allow stacking with other insti.uments of the same

series. The CDC250 is delivered with a 115 V power cord, an

installed fuse for 115 V operation, and this manual.

CDC250 User Manual

Getting Started

Preparing the CDC250175 MHz Universal Counter for Use

Check the following items prior to operating the CDC250175 MHz

Universal Counter for the first time (see Figure I for item locations):

Figure 1 : Line Voltage Selectors, Power Input, and Fuse Locations

CAUTION. To prevent damage to the instrument, set the line voltage

selectors to the proper voltage setting and install the correct line

voltage fuse bofore operating the equipment.

1. Set the line voltage selectors to the input line voltage. These

selectors connect internal wiring for various line voltages. This

product is intended to operate from a power source that does not

supply more than 250 VRMs between the supply conductors or

between either supply conductor and ground. For line voltage

ra,nges, refeT to Appendix A: Specifications on pa.ge 27 .

WARNING. Ilo prevent electrical shock, connect the power cord to a

properly grounded power source. The outside ( ground) Of this

connector is cormected through the equipment to the power source

ground. Do not remove the ground lug from the power cord for any

reason.

3. Connect the input power cord. Use only the power cords specified

Front Panel

Figure 2 shows the front-panel controls, connectors, and indicators

with brief descriptions of the items following the figure.

Figure 2: Front Panel

for this equipment. Refer to Appendix C: Replaceable Parts on

page 37 for power cord part numbers.

WARNING. To prevent electrical shock, unplug the power cord and

disconnect the signal input cable from any signal source before

checking or replacing the fuse.

2. Check that the correct line fuse is installed. The line fuse

provides protection if the equipment malfunctions or an overload

occurs. FLefer to Appendix C.. Replaceable Parts on pa,ge 37 for

fuse part numbers.

CDC250 User Manual

1. CHANNEL 8 INPUT Connector. BNC connector for 5 Hz to

2 MHz signal input.

2. CHANNEL 8 INPUT VOLTAGE Switch. When set to 3 V42 V

(HI) (button in) the CHANNEL 8 INPUT is attenuated by a

factor of ten before application to the counter. When set to

50 mv-5 V (LO) (button out) the signal is not attenuated.

CDC250 User Manual

+ 18 hidden pages

Tektronix CDC250 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual