Tektronix CFG253 Manual

CFG253 Performance Verification & Adjustment Procedures

Page 1of 19 Procedure #: CP1005 Revision: A

p Service Procedures

Product: CFG253 3 Mhz Function Generator

Title: Performance Verification & Adjustment

Procedure #: CP1005 Revision: A

Prepared By: Roy Lindley

Measurement Business Service Support

REVISION LEVEL SUMMARY:

Revision # Date Initiator Level Change

From: To:

Description

A5/16/97 Roy Lindley n/a Initial release

CFG253 Performance Verification & Adjustment Procedures

Page 2of 19 Procedure #: CP1005 Revision: A

CFG253 PERFORMANCE VERIFICATION PROCEDURE

CONTENTS:

Preparation 3

Check DC Offset 3

Check Main Output Amplitudes 4

Square Wave Overshoot, Rise/Fall Time 6

Check Square Wave Duty Cycle 7

Sync (TTL) Output 8

Sine Wave Distortion 9

Frequency Dial Accuracy 9

INTRODUCTION

To ensure instrument accuracy, check its performance after every 2000 hours of operation or

once each year if used infrequently.

The instrument case does not have to be removed for the Performance Check procedure. All

necessary controls and connectors are accessible from the outside.

Test Equipment: Requirement: Example:

Test Oscilloscope 5mV-5V/Div, 50nS/Div Tek TDS210

Frequency Counter > 3MHz, < 1 % Tek CMC251

Distortion Analyzer 100KHz AA501A

Coax Cable 50 ohm P/N 012-0057-01

50 Ohm Terminator P/N 011-0049-01

CFG253 Performance Verification & Adjustment Procedures

Page 3of 19 Procedure #: CP1005 Revision: A

PREPARATION

Connect the instrument and test equipment to an appropriate power source and allow 20

minutes for warm up and stabilization. Set the controls as listed below during warm up.

Initial CFG253 Set-Up:

AMPLITUDE Mid Range

DC OFFSET Pushed In

SYMMETRY Midrange Detent

RANGE 1K

FUNCTION All Buttons Out

VOLTS OUT Button Out

FREQ/10 Button Out

SWEEP Button Out

SWEEP RATE Midrange

SWEEP WIDTH Midrange

FREQ DIAL 0.3

1. CHECK DC Offset

a. Pull out the DC OFFSET knob.

b. Test Scope Set-Up:

Volts/Div 2V

Time/Div 0.2 mSec

c. Connect MAIN OUTPUT to test scope vertical input via coax cable and 50 ohm

terminator.

d. Set test scope Vert Coupling to GROUND, center the trace, then set Coupling

back to DC.

e. While turning the DC OFFSET knob from CCW to CW and back, check for for >

+5 V with DC OFFSET knob CW and > -5 V with the knob CCW (+/- 2.5 Div on

test scope).

f. Push the DC OFFSET knob in (off).

CFG253 Performance Verification & Adjustment Procedures

Page 4of 19 Procedure #: CP1005 Revision: A

2. CHECK MAIN OUTPUT AMPLITUDES

a. Set-Up:

AMPLITUDE CW

DC OFFSET Pushed In

RANGE 1K

FUNCTION Triangle

VOLTS OUT Button Out

FREQ/10 Button Out

FREQ DIAL 3.0

b. Test Scope Set-Up:

Volts/Div 2V

Time/Div 0.2 mSec

c. Connect MAIN OUTPUT to test scope vertical input via coax cable and 50 ohm

terminator.

d. Check the test scope display for > 5 divisions (10V).

e. Rotate the AMPLITUDE knob to nearly CCW.

f. Set test scope to 10 mV/Div. Check that the display reduces to less than 5

divisions (50mV) as the AMPLITUDE knob approaches the CCW stop.

g. Set the VOLTS OUT button in and change the test scope Volts/Div to 5mV.

h. Check for a display of < 1 division (5mV) as the knob approaches the CCW stop.

i. Set the test scope Volts/Div to 0.2 V. Rotate the AMPLITUDE knob fully CW.

j. Check the display for > 5 divisions (1V).

k. Return the VOLTS OUT button to the out position and ensure that the

AMPLITUDE is CW.

CFG253 Performance Verification & Adjustment Procedures

Page 5of 19 Procedure #: CP1005 Revision: A

l. Set the FUNCTION to Square Wave. Use the CFG253 and test scope settings in

Table 1 to check the MAIN OUTPUT AMPLITUDE for the indicated settings :

TABLE 1

Function Range Volts Out

button

Freq.

Dial

Test Scope

Volts/Div

Test Scope

Display

Square Wave 1K Out 3.0 2V/Div > 5 Div

Sine Wave 1K Out 3.0 2V/Div > 5 Div

Sine Wave 1K Out 0.3 2V/Div > 5 Div

Square Wave 1K Out 0.3 2V/Div > 5 Div

Triangle 1K Out 0.3 2V/Div > 5 Div

m. Remove the 50 ohm terminator and connect the coax cable directly to the test

scope input.

n. Set the test scope Time/Div to 1uSec.

o. Check the test scope display for each setting in Table 2:

TABLE 2

Function Range Volts

Out

Freq.

Dial

Volts/D

Display

Triangle 1M Out 3.0 5V/Div > 4 Div

SquareWave 1M Out 3.0 5V/Div > 4 Div

Sine Wave 1M Out 3.0 5V/Div > 4 Div

p. Press the VOLTS OUT button in. Check the test scope display for the settings in

Table 3:

TABLE 3

Function Range Volts

Out

Freq.

Dial

Volts/Div Display

Sine Wave 1M In 3.0 0.5V/Div > 4 Div

Square Wave 1M In 3.0 0.5V/Div > 4 Div

Triangle 1M In 3.0 0.5V/Div > 4 Div

CFG253 Performance Verification & Adjustment Procedures

Page 6of 19 Procedure #: CP1005 Revision: A

q. Rotate the AMPLITUDE knob nearly CCW.

r. Set the test scope Volts/Div to 5mV.

s. Check the display for < 2 divisions (10mV) as the knob nears the CCW stop.

3. Square Wave Rise Time and Fall Time

a. Test Scope Set-Up:

Volts/Div 5V

Time/Div 0.5 uSec

Trig Slope +

b. Set-Up:

AMPLITUDE CW

DC OFFSET Pushed In

RANGE 100K

FUNCTION Square Wave

VOLTS OUT Button Out

FREQ/10 Button Out

FREQ DIAL 3.0

c. Connect MAIN OUTPUT to test scope vertical input via coax cable WITHOUT

the 50 ohm terminator.

d. Adjust AMPLITUDE knob for a 4 division display on the test scope.

e. Set Time/Div to 50 nSec/Div. Adjust Trig Level control as necessary to display

the rising edge of the Square Wave.

f. Check risetime between the 10% and 90% points for < 100 nSec (2 Div).

g. Set test scope Trig Slope to - (negative). Adjust Trig Level to view the Falling

edge of Square Wave.

h. Check the Fall Time between the 10% and 90% points for < 100 nSec (2 Div).

CFG253 Performance Verification & Adjustment Procedures

Page 7of 19 Procedure #: CP1005 Revision: A

4. Check Square Wave Duty Cycles

a. Set-Up:

AMPLITUDE Midrange

RANGE 1K

FUNCTION Square Wave

FREQ/10 Button In

FREQ DIAL 3.0

b. Test Scope Set-Up:

Volts/Div 1V

AC/GND/DC DC

Time/Div 0.2 mSec

Trig Slope +

c. Connect MAIN OUTPUT to test scope vertical input via coax cable and 50 ohm

terminator. Adjust Trig Level as necessary for a stable display.

d. Use test scope variable Time/Div control to set the display for 1 complete cycle

over 10 divisions.

e. Check for nearly equal positive and negative half cycles (50 % duty cycle).

Readjust the variable Time/Div as necessary to maintain 1 complete cycle over

10 divisions.

f. Set FREQ/10 button out.

g. Check that the frequency increases by a factor of 10 as shown by a display of

approximately 1 cycle per division on the test scope.

h. Set the FREQ/10 button in. Rotate the SYMMETRY knob CCW and use the

Time/Div variable to set the first half cycle to 1 division. Rotate the SYMMETRY

knob CW and check for the same half cycle to increase to 5 divisions or greater (a

duty cycle change of 5:1).

i. Return the SYMMETRY knob to the center detent position and the test scope

Time/Div variable to the detent position.

CFG253 Performance Verification & Adjustment Procedures

Page 8of 19 Procedure #: CP1005 Revision: A

j. Repeat steps d and e to verify the 50 % duty cycles for the settings in Table 4.

Table 4

RANGE FREQ. DIAL FREQ/10 TIME/DIV RESULT

1K 3.0 OUT 20uSec 50 % Duty Cycle

1K 0.3 OUT 0.2mSec 50 % Duty Cycle

1K 0.3 IN 2 MSec 50 % Duty Cycle

100K 0.3 OUT 2 uSec 50 % Duty Cycle

1M 0.3 IN 2 uSec 50 % Duty Cycle

5. SYNC (TTL) OUTPUT

a. Set-Up:

AMPLITUDE CW

RANGE 1K

FUNCTION Triangle

VOLTS OUT Button Out

FREQ/10 Button Out

FREQ DIAL 3.0

b. Test Scope Set-Up:

Volts/Div 1 V

Time/Div 0.2 mSec

c. Connect SYNC/TTL OUTPUT directly to the test scope vertical input via a coax

cable (without the 50 ohm terminator).

d. Check the test scope for a display of approximately 4 volts (4 divisions).

e. Repeat step d with the FUNCTION set to Square Wave and Sine Wave.

CFG253 Performance Verification & Adjustment Procedures

Page 9of 19 Procedure #: CP1005 Revision: A

6. SINE WAVE DISTORTION

a. Set-Up:

RANGE 100K

FUNCTION Sine Wave

VOLTS OUT Button Out

FREQ/10 Button Out

FREQ DIAL 1.0

b. Connect MAIN OUTPUT to Distortion Analyzer via coax cable and 50 ohm

terminator.

c. Set the Distortion Analyzer INPUT RANGE to Auto Range, and the FUNCTION

settings to Volts, Auto Range and THD+N.

d. CHECK- For less than 1% distortion for the frequencies listed in Table 5:

Table 5

RANGE FREQ DIAL PER CENT

DISTORTION

100K 1.0 < 1 %

10K 1.8 < 1 %

1K 1.8 < 1 %

100 1.8 < 1 %

10 1.0 < 1 %

7. FREQUENCY DIAL ACCURACY

a. Set-Up:

AMPLITUDE CW

RANGE 1K

FUNCTION Triangle

VOLTS OUT Button In

FREQ/10 Button Out

FREQ DIAL 3.0

CFG253 Performance Verification & Adjustment Procedures

Page 10 of 19 Procedure #: CP1005 Revision: A

b. Connect the CFG253 MAIN OUTPUT to the input of a Frequency Counter.

Check the frequency reading for each set-up listed in Table 6:

Table 6

RANGE FREQ DIAL COUNTER READING

1 M 3.0 2.85 MHz - 3.15 MHz

1 M 0.3 150 KHz - 450 KHz *

100 K 3.0 285 KHz - 315 KHz

10 K 3.0 28.5KHz - 31.5KHz

1 K 3.0 2.85KHz - 3.15KHz

100 3.0 285 Hz - 315 Hz

10 3.0 28.5 Hz - 31.5 Hz

13.0 2.85 Hz - 3.15 Hz

*The Frequency reading accuracy is 5% of full scale. 5% of 3 MHz is 150

KHz

c. Disconnect cable from the Counter and CFG253.

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