Tektronix FG501 INSTRUCTION MANUAL

COMMITTED TO EXCELLENCE

Tektronix, Inc.

p.10.

Box 500

Beaverton, Oregon 97077

INSTRUCTION

Serial Number

MANUAL

First printing August

1972

TABLE OF CONTENTS

Page

SECTION

SECTION

SEICTION

SE:CTION

SE:CTION

SE:CTION 6 OPTIONS 6-

SECTION

1

2

THE FOLLOWING SERVICING INSTRUCTIONS ARE FOR USE BY QUALIFIED PER­SONNEL ONLY. TO A VOID PERSONAL INJURY, DO NOT PERFORM ANY SERVICING
OTHER THAN THAT CONTAINED IN OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.

3

4

5

7

OPERATING INSTRUCTIONS

SPECIFICATION AND PERFORMANCE CHECK

I

WARNING

ADJUSTMENT

MAINTENANCE AND INTERFACING INFORMATION

CIRCUIT DESCRIPTION

REPLACEABLE ELECTRICAL PARTS

)

1-1

2-

3- 1

4-

5-

7-

1

1

1

1

1

SEiCTlON

SEICTION

CHANGE INFORMATION

8

9

DIAGRAM AND CIRCUIT BOARD ILLUSTRATION

REPLACEABLE MECHANICAL PARTS AND EXPLODED VIEW

8- 1

9- 1

Fig.

1-1.

FG

501

Function Generator

REV.

B

JUL

1978

INSTRUCTIONS

Section

1-FG

501

INTRODUCTION

The FG !501 Function Generator is designed to operate

TM

in a
square, tria~ngle, pulse, and ramp waveformsfrom 0.001
to 1
available at the front panel. Variable DC offset of k7.5 volts
is also provided. A "hold1' feature allows the generator
output to be abruptly halted at its instantaneous voltage
level and held there until manually switched on again.

to control the output frequency from an external voltage
source. The output frequency can be swept above or
below the selected frequency to a maximum of
depending on the polarity and amplitude of the VCF input
and the selected output frequency.

generator to be turned on for the duration of an externally
applied gating signal. This mode provides either a single
cycle output or a train (burst) of preselected waveforms

depending on the gating signal width and the generator
frequency setting. The phase (start level) of the waveform
burst can be varied

500-Series power module. Low distortion sine,

Hz

MHz

as well as a $2.5 volt square-wave trigger are

A voltage-controlled frequency (VCF) input is provided

1000:l

Also included is an external gate input that allows the

k90°

by a front-panel control.

Installation and Removal

CAUTION

D

Turn the power module off before inserting the plug­in; otherwise, damage may occur to the plug-in
circuitry. Because of the high current drawn by the

507,

FG
module be turned off before removing the FG
Refer to Fig.
barriers on the interconnecting jack of the selected
power module compartment match the cut-outs in
the

Align the FG 501 chassis with the upper and lower

guides of the selected compartment. Push the module in
and press firmly to seat the circuit board in the inter­connecting jack.

Pull the Power switch on the front panel of the power

module to apply power to the FG 501. Observe that the
POWER indicator light on the FG 501 comes on.

Remove the FG 501 from the power module by pulling

the release latch at the bottom of the front panel and
sliding the unit straight out of the power module.

it is also recommended that the power

7-2.

FG

Check

501

circuit board edge connector.

to

see that the plastic

507.

The variety of swept and modulated signals available
from the IFG 501 make it especially useful for such
applications as testing servo-system or amplifier
response, distortion, and stability; FM generation and
frequency multiplication; or simply used as a variable
beat-f requency oscillator, repetition-rate, or tone- burst
generator. 'The square-wave trigger output can be used as
a source for transistor-transistor logic (TTL) or to syn­chronize
counter.

received. It is designed to operate in any compartment of
TM 500-Series power module only. Refer to the power
module Instruction Manual for line voltage requirements

-

and power module operation.

REV. C JUL

an external device such as an oscilloscope

The FG 501 is calibrated and ready for use when

1978

or

Interconnecting Jack

Bottom Groove

a

Fig.

1-2.

Plug-in installation and removal.

Operating Instructions-FG

501

OPERATING CONSIDERATIONS

NOTE

Before using the
Operating Considerations in this section and the
description of the front-panel controls, connectors,
and indicators in Fig.

FG

501

for the first time, read the

1-3.

Output Connections

The output of the FG 501 is designed to operate as a
voltage source in series with 50
load. At the higher frequencies, an unterminated or
improperly terminated output will cause excessive
aberrations on the output waveform (see lmpedance

Matching discussion). Loads less than

waveform amplitude.

Excessive distortion or aberrations due to improper

termination is less likely to occur at the lower frequencies

(especially with sine and triangle waveforms). However, to
ensure that waveform purity is preserved, observe the
following precautions:

1. Use quality 50

2.

Make all connections tight and as short as possible.

3.

Use quality attenuators, if necessary, to reduce

waveform amplitude to sensitive circuits.

f2

coaxial cables and connectors.

f2

and working into a 50

50 R will reduce the

f2

When signal comparison measurements or time
difference determinations are made, the two siignals from
the test device should travel through coaxial cables with
identical loss and time-delay characteristics.

If there is a dc voltage across the output load, the output
pulse amplitude will be compressed; or in sorne cases, if
the voltage exceeds
prevent this from occurring, the output must be coupled
through a dc blocking capacitor to the load. The time
constant of the coupling capacitor and load must be long
enough to maintain pulse flatness.

f

10

V,

it may short the output. To

Risetime and Falltime

If the output pulse from the FG 501 is used for

measuring the rise or falltime of a device, the risetime
characteristics of associated equipment may have to be
considered. If the risetime of the device under test is at
least 10 times greater than the combined risetimes of the
FG 501 plus the monitoring oscilloscope and associated
cables, the error introduced will not exceed 1% and
generally can be ignored. If the rise or falltime of the test
device, however,
combined
risetime of the device will have to be determined from the
risetime of each component making up the system. This
equals the square root of the sum of the squares of the
individual risetimes. Conversely, the

under test can be found from the same relationship if all
the actual risetimes in the system are known except that of
the device under test.

risetimes of the testing system, the actual

is less than 10 times as long as the

risetime of the device

/-

4. Use terminators or impedance-matching devices to

avoid reflections when using long cables, i.e., six feet or

more.

5. Ensure that attenuators, terminations, etc. have
adequate power-handling capabilities for the output
waveform (approximately 0.5 W into a 50

Power output is determined by the selected waveform,

its amplitude, and the amount of offset voltage selected.

The physical and electrical characteristics of the pulse-

transmitting cable determine the characteristic im-

pedance, velocity of propagation, and amount of signal

loss. Signal loss, due to energy dissipation in the cable
dielectric, is proportional to the frequency; therefore, a
few feet of cable can attenuate high-frequency informa­tion in a fast-rise pulse. It is important to keep these cables
as short as possible.

f2

load).

lmpedance Matching

Reflections.

line, each time it encounters a mismatch, or an impedance
different than the transmission line, a reflection is
generated and sent back along the line to the source. The
amplitude and polarity of the reflections are determined
by the amount of the encountered impedance in relation
to the characteristic impedance of the cable. If the
mismatch impedance is higher than the line, the reflection
will be of the same polarity as the applied signal; if it is
lower, the reflection will be of opposite polarity. If the

reflected signal returns before the pulse is ended, it adds
to or subtracts from the amplitude of the pulse. This
distorts the pulse shape and amplitude.

Matching Networks.

for matching impedance networks into relatively low
impedances. If the FG 501 is driving a high impedance,
such as the 1 MR input impedance of the vertical input for
an oscilloscope, the transmission line must be terminated

As a pulse travels down a transmission

The following describes methods

REV.

B

JUL

1978

--

Operating Instructions-FG

501

REV

C,

MAR

1979

Fig.

1-3.

Operating controls and connectors.

Operating Instructions-FG

501

into a 50
oscilloscope input. The attenuator isolates the input

capacity of the device. Distortion can be caused by this

input capacity.

A simple resistive impedance-matching network that
provides minimum attenuation is illustrated in Fig. 1-4. To
match impedance with the illustrated network, the follow-

ing conditions must exist:

and

Theref ore:

For example; to match a 50

Z1 equals 50

f2

attenuator and a 50

+

Z2)R2 must equal

(R1

Ri + Z2+ R2

RI

+

-

'IR2

ZI + R2

R1R2

=

2122; and RIZl = R2(Z2 - Z1)

Cl

and Z2 equals 125

f2

termination at the

must equal

f2

system to a 125

0.

zI

~2

f2

system,

Zl

-

(Low)

Fig.

1-4.

attenuation.

(22) encounters a greater voltage attenuation

greater than 1 and less than 2 (Z~IZI):

Impedance-matching network that provides minimum

A signal (E2) applied from the higher impedance source

-

(A2)

(High)

which is

2

Theref ore:

1

and R2

When constructing such a device, the environment
surrounding the components should also be designed to
provide a transition between the impedances. Keep in
mind that the characteristic impedance of a coaxial device
is determined by the ratio between the outside diameter of

the inner conductor to the inside diameter of the outer

z,

conductor.
diameter of the outer conductor, and d is the outside

diameter of the inner conductor. E is the dielectric cons­tant (1 in air).

Attenuation Ratios.

provides minimum attenuation for a purely resistive
impedance-matching device, the attenuation as seen from
one end does not equal that seen from the other end.
signal (El) applied from the lower impedance source (Z1)
encounters a voltage attenuation (A1) which is greater

than 1 and less than

=

50dT 125 - 50 = 64.6

1381

E

loglo Dld, where D is the inside

Though the network in Fig. 1-4

2,

as follows:

f2

A

In the example of matching 50

The illustrated
different attenuation ratios by adding
(less than R1) between Z1 and the junction of R1 and R2.

network can be modified to provide

f2

to 125

anot.her resistor

f2.

Duration of Ramps and Pulses

The duration of ramp and pulse waveforrns is always

equal to the half-cycle time of the sine, square, or triangle
waveform frequency. For MULTIPLIER setti~ngs of 1 or
greater, the

a

duty cycle of approximately 80°/o, i.e., frequency equals

approximately 1.6X FREQUENCY

MULTIPLIER settings less than 1, the retrace/off time is

from 10 ms to 100 ms, which results in duty cycles
approaching 10O0/0; i.e., frequency equals approximately
2X FREQUENCY

retraceloff time is such that the waveform has

Hz

dial setting. For

Hz

dial setting.

---

REV.

B

JUL

1978

OPERATION

Operating Instructions-FG

501

Free-Running Output

-A

The following procedure provides a free-running

waveform output with variable frequency and amplitude.

1. Set the AMPL control to the fully counterclockwise
position and the OFFSET control to the 0 (centered)
position. Check that the PHASE control is pushed in (off).

2.

Set the FUNCTION selector to the desired

waveform (see Fig. 1-5).

Gated (Burst) Output and Variable Phase

A gating signal of 2 to 15 V amplitude applied to the
GATE INPUT connector with the PHASE control pulled
out will provide a burst of cycles at the OUTPUT
connector. The duration of the burst and number of cycles
in the burst depend on the gating signal duration and the
output frequency selected. When the gating signal goes to

the zero level, the generator completes its last cycle and
remains quiescent until the next gating signal.

Single cycles can be obtained by applying a gating
signal with a period approximately equal to the period of

the FG 501 output waveform. The number of cycles per

burst can be approximated by dividing the gating signal
duration by the period of the FG 501 output frequency

GATE INPUT

Fig.

1-5.

Output waveforms available from the

3.

Select the desired frequency with the MULTIPLIER

FG

501.

selector and FREQUENCY Hz dial. For example, if the

lo5

MULTIPLIER selector is set to the

position and the

FREQUENCY Hz dial is at 5, output frequency is 500 kHz;

X

i.e., MULTIPLIER setting

FREQUENCY Hz setting. The
output frequency is calibrated when the FREQUENCY
VERNIER control is in the fully clockwise position. The
duration of ramp and pulse waveforms is dependent on the
MULTIPLIER setting. See Duration of Ramps and Pulses
under Operating Considerations for further information.

4.

Connect the load to the OUTPUT connector and

adjust the AMPL control for the desired output amplituae.

Variable

DC

Offset

Pull outward on the OFFSETcontrol (pull switch added

at SN B020000) to position the dc level (baseline) of the

V

output waveform. For example,

+

the dc

+

12.5 V dc

dc

peak ac voltage of a 7.5 V p-p output to +5 and

.t

peak ac while -5 V of offset will reduce the

+

peak ac output to +2.5 V and -5

of offset will increase

$5

V.

GATE INPUT

GATE INPUT

Fig.

1-6.

control at

PHASE

PHASE

PHASE

control at

Single cycle output with variable phase.

90"

control at

90"

LAG

0"

LEAD

1

43

1

-04

REV.

C

JUL

'1978

Operating Instructions-FG

501

The phase (start level) of the waveform burst can be
varied +90° by pulling out and turning the PHASEcontrol
either counterclockwise or clockwise from the 0
(centered) position (see Fig. 1-6). The phase of theoutput
burst is referenced to the sine or triangle waveform 0° start
point.

Output frequency can be varied during the burst

duration by

applying a voltage-controlled frequency

(VCF) signal to the VCF INPUT connector.

Voltage-Controlled Frequency (VCF) Output

The output frequency of any selected waveform can be
swept within a range of 1000:l by applying a 0 to 10 V
signal to the VCF INPUT connector. The polarity of the
VCF input signal determines which direction the output

SWEPT FREQUENCY

RANGE

(A) Uncalibrated

frequency sweeps from the frequency

MULTIPLIER selector and FREQUENCY Hz dial; i.e., a

slet by the

+

signal sweeps the frequency upward as shown in Fig.

-

1-7(A), a

signal sweeps the frequency doiwnward as

shown in Fig. 1-7(B).

The maximum swept frequency range of 1000: 1 encom­passes the sensitive uncalibrated range of the FRE­QUENCY Hz dial, i.e., <.l to 1. Therefore, to ensure that

the frequency does sweep at least a range of 1000:1, it is

recommended that the FREQUENCY Hz dial be set at 10

IN1

and a Oto -1OVsignal beapplied to theVCF

connector.
The output will thus sweep downward at least 1000:l from
a FREQUENCY Hz dial setting of 10 as shown in Fig.

1-7(B). It may be necessary to vary the CAL control to
obtain the full 1000:l swept range or the lowest swept

frequency desired.

,-,

VCF
INPUT INPUT

OUTPUT OUTPUT OUTPUT

Fig.

1-7.

Swept Frequency range with

10

V signals applied to VCF

INPUT

-5

IN

connector.

REV.

B

JUL

1978

An input signal that varies symmetrically about a 0 V

level will also sweep the generator symmetrically about

the center frequency set by the MULTIPLIER selector and

-

FREQUENCY Hz dial as shown in Fig. 1-7(C).

Since the VCF input amplitude vs frequency is a linear
relationship, the frequency output range can be deter­mined from the VCF input amplitude.

Operating Instructions-FG

Triangle

Waveform

I

I

I

I

I

I

I

Sine Wave

501

Hold

Mode

Three detented HOLD positions are provided between
the lowest three MULTl PLl ER selector positions. By
switching to any one of the HOLD positions, the generator
can be stop~ped at its instantaneous voltage level and held
there until the MULTIPLIER selector setting is changed.

Trigger

Olutput

A

TTL-corn pati

ble

+

2.5

V square wave is available from

the TRlG (OUTPUT connector. The frequency of the

trigger

outlput is determined by the output frequency
selected by the MULTIPLIER selector and FREQUENCY
Hz dial (see Fig. 1-8). When the FUNCTION selector is set
for ramp or pulse, the trigger output frequency

.

times the dial indications. Output impedance is 600

is

about 1.6

n.

I

I

I

Duty cycle of the TRlG OUTPUT waveform follows
the duty cycle of the OUTPUT waveform.

Fig. 1-8. Phase relationships between various waveforms from

OUTPUT

and

TRlG OUTPUT

I

I

connectors.

Square Wave

lG

OUTPUT

TR
Waveform

Ramp Waveform

1431-18

REV. B JUL

1978

Operating Instructions-FG 501

APPLICATIONS

Response

The FG 501 is particularly suited for determining

response characteristics of circuits or systems. This
application utilizes the VCF input of the FG 501 to sweep
the generator over a range of frequencies. By applying the
desired waveform from another FG 501 (or equivalent) to a
device under test and sweeping the waveform frequency
over a selected range, various response characteristics
can be observed on a monitoring oscilloscope.

The following procedure describes a technique for

determining response characteristics of any
sensitive device that operates within the frequency range

of the FG 501. Refer to the Voltage-Controlled Frequency

(VCF) Output discussion under Operation for additional

information.

1. Connect the equipment as shown in Fig. 1-9.

2.
dial for the desired upper or lower frequency limit
(depending on the direction you wish to sweep).

Analysis

frequency-

Set the MULTl PLl ER selector and FREQUENCY Hz

3.

Apply the desired waveform to the VCF INPUT

connector. (A positive-going waveform will sweep the
frequency upwards from the FREQUENCY Hz dial setting
while a negative-going waveform will sweep clownwards.

4.

Adjust the amplitude of the VCF input waveform for

the desired output frequency range.

5. Observe the response characteristics on the

monitori ng oscilloscope.

The frequency at whi

characteristic occurs can be determined by first removing

the VCF input waveform, then manually adljusting the

FREQUENCY Hz dial to again obtain the particular

characteristic observed in the swept display and reading
that frequency on the FREQUENCY Hz dial.

splayed respon

WAVEFORM

Fig.

I

,

1-9.

Analyzing circuit or system response.

UNDER

TEST

1

REV. B JUL

1978

Tone-Burst Generation or Stepped Frequency
Multiplication

\

._

The FG 501 can be used as a tone-burst generator or

frequency multiplier for checking tone-controlled
devices. This application utilizes a ramp generator, such

as the TEKTRONIX RG 501, as a VCF signal source and a
pulse generator, such as the TEKTRONIX PG 501, as a
gating signal source.

Operating Instructions-FG

2.

Pull out the FG 501 PHASE control. Set the ramp

501

generator for the desired ramp duration and polarity.

3.

Adjust the pulse generator period for the desired
number of bursts within the selected ramp duration.
Adjust the pulse generator duration for the desired burst

width.

The following procedure describes a technique for

obtaining a tone-burst or frequency multiplied output

from the FG 501. Refer to the Gated (Burst) Output and

Variable Phase and the Voltage-Controlled-Frequency
(VCF) Output discussions under Operation for additional
information.

1. Connect the equipment as shown in Fig. 1-10.

VCF INPUT*

GATE INPUT*

Tone-Burst or

Stepped Frequency

Output

4. Select the sweep frequency range by adjusting the
Hz

FREQUENCY

dial for one end of the swept range

(upper or lower limit depending on the polarity of the
ramp). Then, adjust the ramp generator amplitude for the
other swept frequency limit.

Various other tone-burst or frequency multiplied
characteristics can be obtained by using different gating
input waveforms, i.e., triangle, sine, square, etc.

UUUL

REV

A,

JUN

1978

PULSE

GEN

Fig.

*Gating pulse synchronized with VCF RAMP.

DEVICE

UNDER

1-10.

Tone-burst generation or stepped frequency multiplication.

Section

SPECIFICATION

AND PERFORMANCE CHECK

SPECIFICATION

2-FG

501

Performar~ce Conditions

The electrical characteristics are valid only if the

FG 501 has been calibrated at an ambient temperature

between +20° C and +30° C and is operating at an ambient

tem perature between 0" C and +50° C unless otherwise

noted. Forced air circulation is required for ambient

tem

perat ure above 4-40' C.

Table

ELECTRICAL CHARACTERISTICS

Characteristic

Frequency

Range

Sine VVave, Square Wave,
and Tiriangle

Accuracy

Resolution

--

Performance Requirement

0.01

Hz

to 1

Within 3% of full scale 1 to 10;
.1 to 1 uncalibrated.

-

MHz

in 9 decade steps.

Only those items listed in the Performance Re­quirements column of the Electrical Characteristics table
are normally verified when doing the Performance Check
procedure of this manual. Items listed in the Supplemental
lnformation column are either explanatory notes or
minimum performance characteristics for which no

tolerance ranges are specified, and which normally re-

quire verification only after repairs or parts replacement.

2-1

--

-

Supplemental lnformation

1 part in
FREQUENCY VERNl ER control.

lo4

of full scale with

Stability

Tem perature

Time

Pulse and Ramp range

Time

Symmetry

Sine Wave, Square Wave,
and Triangle

REV.

6

JUL

'1978

Within 1% from 0.001
on calibrated portion (1 to 10)
of FREQUENCY
+50° C.

Hz

to 1 MHz

Hz

dial, +20°C to

Within 2% from 0.1
and within 10% from 0.001

Hz,

0.1

Within 0.1% for 10 minutes.
Within 0.25% for 24 hours.

=2X dial setting with MULTI-

PLIER at
ting with MULTIPLIER AT
setting.

Within 10% on uncalibrated por­tion (0.1 to 1) of FREQUENCY
dial.

0° C to +SO0 C.

Hz

to 1 MHz,

Hz

to +.6X dial set-

lo5

to

Hz

Specification and Performance Check-FG

Characteristic

501

Table

2-1

(cont)

Performance Requirement

Supplemental I nformiation

--

Amplitude (excluding offset)

Stability

Temperature

Time

Hold Mode Stability

Offset

Amplitude

Into Open Circuit

Into 50 ohm Load

SN B130000-up: 20 V p-p open

V

circuit. 10
Sine, triangle, and square wave

amplitudes matched within
single setting of AMPLlTUDEcon­trol. Below SN B130000, OUTPUT

control provides 15

circuit and 7.5

fl

load.

50

SN B130000-up:
SN below 8130000: + or - 5
SN B130000-up: + or - 5

SN below B130000: + or - 2.5

p-p into 50

V

p-p into

+

fl

V

p-p open

or - 7.5

load.

5% for

V

V

V

V

Power-supply limiting causes com­pression of output waveform

when maximum amplitude and max-

imum offset are used
neousl y.

Within 2% from 0.1 Hz to 1 MHz.
Wtihin

0.1 Hz, 0°C to
Within 0.1% for 10 minutes.

Within 0.25% for 24 hours.

Within 5% of full output voltage in 1

hour at +25OC on 0.001

10% from 0.001 Hz to

+SO0

simu~lta-

C.

Hz:

range.

Range

Into Open Circuit

Into 50 ohm Load

Output Impedance
Trigger Output

Amplitude

Frequency

Triangle and Ramp
Linearity (between
10% and 90% points)

I

At least

plus offset.

SN B130000-up: At least

-6

SN below B130000: At least

and

offset.

3

600
Same as frequency at output

nector.

+

and - 15 V peak signal

V

peak signal plus offset.

-

5 V peak signal plus

+2.5 V square wave into a

n

load.

+

and

+

con-

I

n.

50

Within

100 kHz excluding first 200 ns

after switch points.
Within

excluding first 200 ns after
switch points.

1% from 0.081 Hz to

2% from 100 kHz to 1 MHz,

-

REV

C,

MAR

1979

Table

2-1

Specification and Performance Check-FG 501

(cont)

characteristics

-

Ramp Duration

Sine Wave Distortion

Square Wave and Pulse
Outputs

Aberrations

Pulse Dluration

External Gate lnput

lnput Signal

Performance Requirement

1% or less from 0.001 Hz to 1 Hz.

0.5% or less from 1 Hz to 20 kHz.
1% or less from 20 kHz to 100 kHz.

2.5% or less from 100 kHz to 1 MHz
at

10' MULTIPLIER setting.

100 ns or less.
5% or less measured p-p with out-

put amplitude at 10 V into exter-

0

nal 50

load.

Supplemental Information

--

(see Operating Consider-

2f ations).

Applies to calibrated portion of
dial only (1 to 10). Valid from
+lO°C to +50°C.

=

1

(see Operating Consider-

2f ations).

Square wave at least +2 V, but

not to exceed +15 V. Output bursts

are synchronized with gate input.

Burst Length

Phasing

lnput lrnpedance

External V'oltage­Controlled Frequency
(VCF) lnput

Output Frequency

Range

Slew Rate

At least 1000:l with 10 V VCF

input. Negative-going voltage
decreases frequency; positive­going increases frequency.
f,,

=

10X MULTIPLIER setting,
MULTl PLl ER setting

f.

=

mln

100

Determined by selected output

frequency and gating pulse width.

Continuously variable from -90@
to +90° referred to 0° sine or
triangle start points.

REV

C,

MAR

1979

Specification and Performance Check-FG

ENVIRONMENTAL CHARACTERISTICS

501

Table

2-2

Characteristics

Tern perat ure

Operating
Storage

Altitude

Operating

Storage

Vibration

Operating and non-operating

Shock

Operating and non-operating

Transportation

Information

To 15,000 feet. Maximum operating temperature decreased by
1

O

C/100 feet from 5000 to 15,000 feet.

-

To 50,000 feet.

With the instrument complete, vibration frequency swept from

10 to 55 to 10 Hz at 1 minute per sweep. Vibrate 15 minutes in

each of the three major axes at 0.015" total displacement. Holld

10 minutes at any major resonance; or, if none, at 55 Hz. Totid

time, 75 minutes.

30 g, 1/2 sine, 11 ms duration, 3 shocks in each direction
along 3 major axes, for a total of 18 shocks.

Qualified under National Safe Transit Committee Test Procedure
1A, Category

11.

-

-

PHYSICAL CHARACTERISTICS

Characteristic

Overall Size
(measured at maximum
points)

Height
Width
Length
Net Weight
(Instrument only)

Table 2-3

I

Dimension

5.0 in (12.7 cm)

2.6 in (6.6

12.2 in (31

cm)

em)

2 Ibs (0.906 kg)

PERFORMANCE CHECK

Introduction

This procedure checks the electrical characteristics of

the FG 501 that appear in the Specification section of this

manual. Thils procedure can also be used by an incoming
inspection facility to determine acceptability of perfor­mance. If the instrument fails to meet the requirements
given in this performance check, the adjustment
procedure should be performed.

The electrical characteristics in Table 2-1
if the FG
+20°C to +:30° C and operated at an ambient temperature
of 0°C to 4-50°C. Forced air circulation is required for
ambient temperature above +40° C.

5011 is calibrated at an ambient temperature of

LIST

arevalid only

Table

OF

TEST EQUIPMENT REQUIREMENTS

Specification and Performance Check-FG

Tolerances that are specified in this performance

check procedure apply to the instrument under test and do

not include test equipment error.

Test Equipment Required

The test equipment listed in Table 2-4, or equivalent, is

required to perform the performance check. Test equip­ment characteristics listed are the minimum required to
verify the performance of the equipment under test.
Substitute equipment must meet or exceed the stated

requirements. All test equipment is assumed to be
operating within tolerance.

2-4

501

Performance

Description

Oscilloscope

Power Module

Digital Voltmeter

Frequency Counter

Pulse Generator

Requirement

Bandwidth dc to 15 MHz;
deflection factor 10 mV/
div to 5 V/div; sweep
rate 20 ns/div to 1 ms/
div.

Three compartments or
more.

Range 0 to +20 V dc; dis­played error less than

0.5O/o.

Frequency range 0.1 Hz
to above 1 MHz; accuracy
within one part of
+1 count.

0 to +2 V square-wave
output into 50 load.

Period 0.2 ms; duration

0.1 ms.

lo5

Application

Steps 1, 2, 3,
and 9.

All tests.

VCF INPUT and Offset
range checks.

Basic timing
IN PUT.

Phase range check.

5,

&

7,

VCF

8,

Example

TEKTRONIX T921 or equiv­alent.

TEKTRONIX TM 503,
TM 504, or equivalent.

TEKTRONIX DM

TEKTRONIX DC 504"
or equivalent.

TEKTRONIX PG 501"
or equivalent.

501a

Variable dc

Power Supply

"~equires

Thll

Output 0 to 20 V at 0.4

or greater.

500-Series power module.

Check VCF INPUT

A

TEKTRONIX PS 501"

or equivalent.

Specification and Performance Check-FG

Performance

Distortion
Analyzer

to at least 600 kHz. Dis­tortion resolution <0.5O/o.

501

Table

2-4

(cont)

Application

Check sine wave dis-

tortion.

Example

Hewlett-Packard 334~ Dis­tortion Analyzer or equiv­alent.

50

R

Feedthrough

Termination (2)

600

R

Feedt hroug h

Termination

50

R

Coaxial Cables

(2 ea)

Adapter bsm-to-bnc.

Adapter

Tee Connector

IOX

Attenuator

bnc connectors. Steps 1, 2, 3, 5, 6,

bnc connectors.

bnc connectors.

Dual banana plug-to-bnc

female.

bnc connectors.

bnc connectors

50

R

impedance.

PRELIMINARY PROCEDURE PERFORMANCE CHECK PROCEDURE

8,

and 9.

TRIG OUTPUT Amplitude

check

All.

TRIG OUTPUT Amplitude

check.

VCF INPUT check. Tektronix Part No.

Basic timing check.

Square wave checks.

Tektronix Part No.
01 1-0049-01.

Tektronix Part No.
01 1-0092-00.

Tektronix Part No.
01 2-0057-01.

Tektronix Part No.

103-0036-00.

103-0090-00.

Tektronix Part No.

103-0030-00.

Tektronix Part No.

01 1-0059-02.

1. Ensure that the correct nominal line selector block
has been installed on the line selector pins on the power
module interface board, and the regulating range selected
includes the applied line voltage. Refer to the installation
section of the power module manual.

2. Ensure that all test equipment is suitably adapted to

the applied line voltage.

3.

Install the FG 501 into the power module and, if
applicable, install the TM 500-Series test equipment into
the test equipment power module.

4. Connect the equipment under test and the test
equipment to a suitable line voltage source. Turn on all
equipment and allow at least 20 minutes for the equipment
to stabilize.

mi el ow

SN

2~or SN below

B130000

AMPL control is labeled OUTPUT.

B130000

set OFFSET to zero.

1.

Dial Alignment

a. Set the FG 501 controls as follows:

FUNCTION Triangle

AMPL'

OFFSET^

PHASE
MULTIPLIER 1
FREQ VERNIER Fully cw
FREQUENCY Hz Near 10

b. Adjust the oscilloscope vertical for dc coupling at
2 V/div sensitivity. Set the time base sweep speed to
.1 ms/div. Set the triggering controls to internad source+
slope operation.

c. Connect the OUTPUT of the FG 501 through a 50
coaxial cable and a 50 R termination, with the 50
termination at the vertical input of the oscilloscope.

FUIIY

cw

Midrange and In
In

o3

R
R

-

REV

A,

MAR

1979

Specification and Performance Check-FG

501

\---

d. Adjust the oscilloscope trigger level control for a

stable display of approximately 1 cycle per division.

e. CHECK-that the display stops changing frequency
within k.5 minor division of the 10 mark as the FRE­QUENCY Hz dial is adjusted back and forth around 10.

(For ease in viewing the change in frequency, position the

waveform :so the trailing edge can be observed.)

f. Disconnect the 50

oscilloscope vertical input.

2.

Square Wave Aberrations and Symmetry

a. Set the FG 501 controls as follows:
FUNCTION

AMPL'

OFFSET'^

PHASE

MULTIPLIER

FREQ VIERNIER Fully cw
FREQUEINCY Hz 8.0

b. Set the oscilloscope for a dc-coupled vertical input

at 1 V/div sensitivity and a sweep speed of .05 pddiv.

Trigger on

+

slope.

R

cable and termination from the

Square Wave

FUIIY

cw

In
In

I

o5

g. Adjust the test oscilloscope trigger level to display
the entire falling portion of the square wave. Check that
the

falltime is approximately 70 ns. Readjust

necessary) to balance risetime and falltime.

h. Set the oscilloscope
that aberrations on the positive and negative front corners
of the square wave are less than 5%.

i. Set the oscilloscope vertical sensitivity to 1 V/div.

j. Adjust the oscilloscope sweep speed and variables

to display one full

k. Set the oscilloscope

Position the square-wave center voltage transition to

exact display center.

I. Change the trigger polarity from

m. CHECK-that the center transition of the display

does not shift horizontally more than 1 division (within

1

O/o)

.

n. Disconnect the 50 R cable and 50 R termination.

cycleof the square wave in 10 divisions.

time/div to .5 ps/div. Check

XI0 sweep magnifier on.

f

slope to - slope.

C281

(if

c. Connect the FG 501 OUTPUT through a 50
coaxial cable and a 50 R termination to the oscilloscope
vertical input.

d. Adjust the test oscilloscope trigger level control to
display the entire rising portion of the square wave.

e. Adjust the FG 501 OFFSET and AMPL controlsfor a

five-division display (2.5 divisions above and below the

graticule centerline).

f. Adjust the FG 501 high frequency compensation b. Connect a 50

ai

(C281) for

th el ow

-

2~or SN belajw B130000 set OFFSET to zero.

risetime of approximately 70 ns (10% to 90%).

SN 81130000 AMPL control

is

labeled OUTPUT.

R

3.

Basic Timing

a. Set the FG 501 controls as follows:

FUNCTION Triangle
AMPL'

OFFSET^

PHASE
MULTIPLIER 1

FREQ VERNIER Fully cw
FREQUENCY Hz 10 (exactly)

R

coaxial cable and 50 R termination

from the FG 501 OUTPUT to the frequency counter input.

FUIIY

cw

Off (i n)
In

o5

REV A, MAR

1979

Specification and Performance Check-FG 501

c. CHECK-the FG 501

following chart.

Counter

Measurement

Interval

.1 SEC

1 SEC

1 SEC

1 SEC

10 SEC

1 SEC

1 SEC

1 SEC

FG 501

=requency

Dial

10

timing according to the

Frequency

(f

3%

of full

scale)

1 MHz +30 kHz
(1 .O3 MHz-.970 MHz)

100 kHz f3 kHz
(103 kHz-97 kHz)

10 kHz +300 Hz
(1 0.3 kHz-9.7 kHz)

1 kHz h3O Hz
(1 .O3 kHz-.97 kHz)

100 Hz +30 Hz
(130 HZ-70 HZ)

1 kHz +300 Hz
(1.3 kHz-700 HZ)

pi!;z:7 ZZ)

100 kHz +30 kHz
(130 kHz-70 kHz)

Hz

FG 501

Multi-

plier

1

o5

1

o4

1

o3

1 02

1

o2

1

o3

1

o4

1

o5

4.

VCF

INPUT

a. Set the FG 501 controls as follows:

FUNCTION Triangle

AMPL'

OFFSET^

PHASE In

MULTIPLIER

FREQ VERNIER Fully cw

FEQUENCY Hz 1 0 (exactly)

C2

b. Connect a 50
termination from the FG 501 OUTPUT to the frequency
counter input for a reading of 1 MHz.

c. Adjust the 0-20 V power supply for zero volts out.

d. Connect a banana-to-bnc adapter and 50
from the 0-20 V power supply output to the FIG 501 VCF

INPUT. Make sure the ground side of the banana-to-bnc

adapter goes to the

e. Adjust the power supply output voltage to change
the frequency of the FG 501 as read on the digital counter
to 0.001 MHz.

coaxial cable and 50 nfeedthrough

+

terminal on the power supply.

FUIIY
In

I

o5

cw

$2

cable

d. Set the frequency counter (dc coupled) to measure

period for FG 501 MULTIPLIER settings slowerthan

the following chart.

FG 501

Hz

Frequency

Counter

10 SEC

1 SEC

1 SEC

e. Disconnect the coaxial cables, terminations and tee

connectors from all units.

Dial

FG 501

Multiplier

Period

(f

3%

of full scale)

10.0 ms k.33 ms
(1 0.33-9.67 ms)

100 ms h3.3 ms
(1

03.3-96.7 ms)

1000 ms k33.3 ms
(1 033.3-976.7 ms)

lo2

in

f. Disconnect the bnc cable from the FG 501 VCF

INPUT and connect the variable dc power supply to the
digital voltmeter input.

g. CHECK-that the voltage measured on the digital

voltmeter is <-I0 V.

h. Adjust the power supply output voltage to zero.

i.

Disconnect the cables and termination from all units.

5.

OUTPUT Signal Amplitude and Waveshape

a. Set the FG 501 controls as follows:
FUNCTION Si newave

AMPL'

OFFSET^

PHASE In
MULTIPLIER 1
FREQ VERNIER Fully cw
FREQUENCY Hz 10

FUIIY

In

o3

cw

elow ow

SN

SN

2~or

below

B130000

8130000

AMPL control is labeled OUTPUT.

set OFFSET to zero.

REV

44,

MAR

1979

Specification and Performance Check-FG

501

b. Set the oscilloscope vertical for dc-coupling at

2

V/divsensitivity. Set the triggering controls to internal,

slope. Set the time base sweep speed to 20 ps.

R

c. Connect a 50

from the FG 501 OUTPUT to the oscilloscope vertical

input and obtain a triggered display.

d. Turn the FG 501 FUNCTION selector to each

position.

e. CHECK-that the peak-to-peak amplitude of each
output
for SN below B130000.

FUNCTION selector corresponds to that shown on the

front panel of the FG 501.

from the oscilloscope.

sign,al is 210 volts for SN B130000-up; 37.5 volts

f. CHECK-that the waveform for each position of the

Disconnect the 50

g.

6.

OFFSE'T Range

a. Set the FG 501 as follows:

coaxial cable and 50 R termination

R

termination and 50 R cable

R

+

h. Disconnect the 50

from the digital voltmeter.

7.

TRlG OUTPUT Amplitude

a. Set the FG 501 as follows:

FUNCTION Triangle

AMPL'

OFFSET^

PHASE In
MULTIPLIER 1
FREQ VERNIER Fully cw
FREQUENCY Hz 10

b. Set the oscilloscope for 1 V/div vertical sensitivity.

c. Connect a bsm-to-bnc adapter to the FG 501 TRIG

OUTPUT. Connect a 50

R

to a 600
termination to the oscilloscope vertical input. Set os-

cilloscope triggering to internal and

triggering level for a stable display.

through-signal termination. Connect the 600

cable and 50 R termination

FUIIY

cw

In

o3

R

coaxial cable from the adapter

+

R

slope. Set the

FUNCTION Triangle

-

AMPL

OFFSET OUT (SN B130000-up)

PHASE

MULTI

PL-I ER 1

FREQ VERNIER Fully cw

FREQUENCY Hz 10

b. Set the digital voltmeter to the 20 dc volts scale.

Connect the FG 501 OUTPUT with a 50

c.
cable terminated in 50

d. Adjust the FG 501 OFFSET to the fully clockwise

position.

e. CHECK-SN B130000-up for at least

below B1 30000 for at least 4-2.5 V.

f. Adjust the FG 501 OFFSET to the fully

counterclockwise position.

g. CHECK-SN B130000-up for at least -3.75 V; SN

B130000 for at least -2.5 V.

below

Fully ccw

In

o3

R

coaxial

R

at the digital multimeter input.

f3.75 V; SN

d. CHECK-for a square wave display equal to or

greater than 2.5 volts in amplitude.

R

e. Disconnect the adapter, cable, and 600

tion from both units.

8.

Sine Wave Distortion

a. Set the FG 501 controls as follows:
FUNCTION Sine wave

AMPL'

OFFSET^

PHASE In
MULTlPLl ER 10
FREQ VERNIER Fully cw
FREQUENCY Hz 10

b. If using a distortion analyzer similar to the
connect the 50
FG 501 OUTPUT connector to the distortion
input. Place
connector.

R

cable and 50 R termination

a

50 R termination on the FG 50

FUIIY

In

cw

termina-

HP 334A,

from the

analyzer

1 VCF IN

elow ow

SN B1130000

2~or SN below 8130000 set OFFSET to zero.

REV

A,

MAR

'1

979

AMPL

control

is

labeled OUTPUT.

Specification

and

Performance Check-FG 501

c. CHECK-the sine wave distortion at frequencies

and amplitudes as shown on the following chart:

Distortion

FG 501

Frequency

10

o5

1

o3

1

d. Disconnect cable and terminations from FG 501

and distortion analyzer.

9.

Phase Range

a. Set the FG 501 controls as follows:

FUNCTION Triangle

AMPL'

OFFSET^

PHASE In

MULTIPLIER 1

FREQ VERNIER Fully cw

FREQUENCY Hz 10

100 Hz 0.5%

10 kHz 0.5%

1 MHz 2.5%

5

HZ

Midrange
In

0.5%

o3

d. Adjust the pulse

0.1 ms duration and 0.2 ms period.

e. Disconnect the pulse generator output cable and

termination from the oscilloscopeand connect them to the

FG 501 GATE IN.

f.

Connect a 50 n coaxial cable from the FG 501

OUTPUT to a 50

input.

g. Pull the FG 501 PHASE control knob out and turn it

fully clockwise.

h. Check-that the flat portion of the display moves to
the top peak of the triangle waveform as observed on the
oscilloscope.

i. Set the FG 501 PHASE control f~~lly coun­terclockwise.

j. Check-that the flat portion of the display moves to

the bottom peak of the triangle.

k. Set the FG 501 PHASE control to

generator

C2

termination at t he oscilloscc~pe vertical

for

a

2-volt square wave,

0"

and push it in.

-

-

b. Set the oscilloscope vertical for dc-coupling at

+

1 V/div sensitivity. Trigger on the
internal, and ac coupled. Set the time basesweep speed to
50 /IS.

C2

c. Connect a 50

+

generator
input of the oscilloscope.

e el ow

2~or SN below B130000 set OFFSET to zero.

output to a 50 Q termination at the vertical

SN 8130000

coaxial cable from the pulse

AMPL

control

is

slope, automatic,

labeled OUTPUT.

I. Adjust the FG 501 PHASE control fully clockwise

and counterclockwise.

m. Check-that there is no change in the o:~cilloscope

display.

n. Disconnect all cables and terminations.

This concludes the FG 501 Performance Check.

REV

A,

MAR

1979

WARNING

THE FOLLOWING SERVICING INSTRUCTIONS ARE

FOR USE BY QUALIFIED PERSONNEL ONLY. TO
AVOID PERSONAL INJURY, DO NOT PERFORM ANY
SERVICING OTHER THAN THAT CONTAINED IN
OPERATING INSTRUCTIONS UNLESS YOU ARE
QUALIFIED TO DO SO.

ADJUSTMENT

Section

3-FG

501

Introduction

This adjustment procedure is to be used to restore the
FG 501 to original performance specifications. Adjust­ment need not be performed unless the instrument failsto
meet the Performance Requirements of the Electrical
Characteristics listed in the Specification section, or the
Performance Check cannot be completed satisfactorily.

Completion of all adjustment steps in this procedure

ensures that the instrument will meet the performance
requirements listed in the Specification section. However,
to fully ensulre satisfactory performance, it is recommend­ed that the Performance Check be performed after any
adjustment is made.

Services Available

Tektronir:, I nc. provides complete instrument repair

and adjustment at local Field Service Centers and at the

Factory

Office or representative for further information.

Servicecenter. Contact your local Tektronix Field

Table

Recali bration Interval

Recommended recali bration interval is 2000 hours of

operation or six months, whichever occurs first.

Test Equipment Required

The test equipment listed in Table 3-1, or equivalent, is
required for adjustment of the FG 501. Specifications
given for the test equipment are the minimum necessary

for accurate adjustment and measurement. All test equip-

ment is assumed to be correctly calibrated and operating

within specification.

If other test equipment is substituted, control settings

or calibration setup may need to be altered to meet the

requirements of the equipment used.

A

flexible TM 500 extender cable, Tektronix Part No.

067-0645-02, is useful for troubleshooting or adjusting the

FG 501; however, the complete Adjustment Procedure

can be performed without use of the extender.

3-1

-

Power Module

Digital Voltrneter

Frequency Counter

Pulse Generator

.-

-

--

De:scription

LIST

OF

TEST EQUIPMENT REQUIREMENTS

Performance
Requirement

Bandwidth dc to 15 MHz;
deflection factor 10 mV/
div to 5
rate 20 ns/div to 1 ms/
div.

Three compartments or
more

Range 0 to
displayed error less
than 0.5O/0.

Frequency range 0.1 Hz
to above 1 MHz; accuracy
within one part in
+1 count.

0 to

output into 50

Period 0.2 ms; duration

0.1 ms.

V/div; sweep

f

20 V dc;

+2

V square-wave

Ll

lo5

load.

Application

Steps 4 through 15

All steps

Set power supply volt­ages

&

Basic timing
INPUT

Set phase range

VCF

Example

TEKTRONIX T921 or
equivalent

TEKTRONIX TM 503,
TM 504, or equivalent

TEKTRONIX DM 501"

TEKTRONIX DC 504"
or equivalent

or equivalent

REV

C,

JUN

1978

Description

Distortion Analyzer

Performance
Requirement

Frequency range from
1 Hz to at least 600
kHz. Distortion reso­lution <0.5O/0.

Table

3-1

(cant)

Application

Set sine wave for min­imum distortion

-.

Example

Hewlett-Packard 334A
Distortion Analyzer
or equivalent

50

n

Feedthrough

Termination (2)

n

Feedthrough

600
Termination

n

Coaxial Cables

50
(2 ea)

Adapter

Tee Connector

1 OX Attenuator

1

Variable Auto­transformer

TM 500 Extender Cable

"~equires

TM

500-Series Power Module.

bnc connectors

bnc connectors

bnc connectors

bsm-to-bnc

bnc connectors

bnc connectors; 50

impedance.
Output to 135 V (270 V)

at =500 W

Make connections be-

tween FG 501 and power

module.

I

C2

As required

Sine wave upper and
lower level adjustment

As required

Sine wave upper and
lower level adjustment

As required

-

As required

Setting power supplies

As required

I

Tektronix Part No..
01 1-0049-01

Tektronix Part No.
01 1-0092-00

Tektronix Part No.
01 2-0057-01

Tektronix Part

103-0036-00

Tektronix Part No..

-

103-0030-00

Tektronix Part No.

1-0059-02

01

General Radio WIOMT3W
or equivalent

Tektronix Part No.

067-0645-02 or
equivalent

No.

--

--

Adjustment Locations

See Fig. 3-1 for the locations of all adjustable com­ponents and test points mentioned in this procedure. All
adjustable components are located on the left side of the
FG 501 circuit board.

Preparation

a. Disconnect the power module from the power
source. Make sure the power module is set for the line
voltage to be applied (see power module manual for line
voltage setting). If the adjustments are to be made with the

FG 501 plugged into the power module, remove the covers

from the power module. If the adjustments are to be made

with the FG 501 on an extender cable (Tektronix Part No.
067-0645-02), be sure the extender cable is oriented with
the top of one connector toward the top of the FG 501 and
the top of the other connector toward the top of the power

module.

b. Remove the side covers of the FG 501 to gain access

to the components and test points on the circuit board.

Pull the rear end of the side coveroutwardfrorrl
the instrument (the covers snap into place).

c. Install all required TM 500-Series test equipment
into the power module(s). Install the FG 501 (in left
compartment of power module if extender cable is not
used).

d. Connect the power module that powerst he FG 501

to avariable autotransformer that is set to the middle of the

line voltage operating range selected by the
selector block in the power module. Connect the
autotransformer to a line voltage source and turn the
FG 501 on.

e. Connect all test equipment to a suitable linevoltage
source and turn it on. Allow at least 30 minutes
time before starting the adjustment procedure. All ad­justments must be made at an ambient temperature

between +20°C and +30°C.

theside of

liine voltage

REV

D,

warmup

MAR

1979

-

Fig.

3-1.

Adjustment and test point locations,

SN

8020000 & up.

REV

C,

MAR

1979

Fig. 3-2. Adjustment and test point locations, below

SN

8020000.

Initial Control Settings

Set the following controls during warm-up time:

FG

501

FUNCTION Triangle

FUIIY

AMPL'

OFFSET^

PHASE
FREQ VERNIER Calibrated (fully cw)
MULTIPLIER 1

FREQUENCY Hz 1

DM

501

Range/Function switch 20 DC Volts

cw

In (off)

Off (pushed in, set to

o4

0")

PROCEDURE

(SN

8020000

1.

Reference Current Adjustment

a. Connect the digital voltmeter Lo input lead to
ground (at negative end of C400). Connect the Hi input
meter lead to

b. ADJUST-43400 (Reference Current) for a meter
reading of 4-13.8 V dc.

TP1 on the FG 501 (see Fig. 3-1).

and

up)

(H3.8

V dc)

5.

Adjust Square-Wave High-frequency

Compensation and Check Risetime

Control Setting Changes:

FG

501

FUNCTION Square wave

Oscilloscope

Time/div

Volts/div 2 V
Input Coupling Dc

a. Connect the FG 501 OUTPUT connector through a

M2

50
cilloscope vertical input connector. Check that the display
amplitude is at least 10 V peak-to-peak (SN 6130000-up);

7.5 V peak-to-peak for SN below

intensity, focus, and position controls for a visible,

triggered, vertically-centered five-division display.

compensation) for a square front corner and flat top with

minimum aberrations on the positive-going portion of the
square-wave display (this adjustment will affect
wave risetime).

coaxial cable to a 50 n termination at the os-

b. Set the oscilloscope variable volts/div, triggering,

c. ADJ UST-C281 (square-wave high-f requency

2 ps (Mag off)

B130000.

square-

-.

2. +20

the FG 501.

+20.0 V dc.

3.

the FG 501.

(+16.80 V to 4-17.20 V).

4.

the FG 501.

(-17.20 to -16.80 V).

FG 501.

'8elow SN 8130000 AMPL control

2~or SN below 8130000 set OFFSET to zero.

Volt Supply Adjustment

a. Move the digital voltmeter Hi input lead to TP3 on

b. ADJUST-R415

4-17

Volt Supply Check

a. Move the digital voltmeter Hi input lead to TP8 on

b. CHECK-for a meter reading of +I7 V dc, +200 mV

-17

Volt Supply Check

a. Move the digital voltmeter Hi input lead to TP9 on

b. CHECK-for a meter reading of -17 V dc, +200 mV

c. Disconnect the digital voltmeter leads from the

(+20 Volts) for a meter reading of

is

labeled OUTPUT.

d. Set the oscilloscope time base to 20 nsi (Mag on).
Set intensity, triggering, and position controls as
necessary to observe the positive-going square-wave
leading edge over approximately five horizontisl graticule
divisions.

e. Measure the

the oscilloscope instruction manual for risetime measure-

ment techniques). Adjust the position
quired. At a sweep speed of 20 ns/div, the riseti~me reading
should be no more than five horizontal divisiorls between

the

10% and 90% risetime points (100 ns or less).

f. If necessary, repeat parts c through e ifor a com­promise between best leading edge and flat top
(aberrations not to exceed

than 100 ns.

6.

Dial Calibration

Control Settings:

FUNCTION

Time base

Triggering

risetime of the leading edge (refer to

controls as re-

5%) with a risetime of no more

FG

501

Triangle

Oscilloscope

10 ps

For triggered dlisplay

REV

PI,

MAR

1979

a. Set th~e FREQUENCY Hz dial just to the point (near

10) where the frequency of the displayed waveform
becomes maximum and there is not further change. This

will be a few degrees before the waveform disappears

(there is no signal output for a part of the area above 10
and below
maxi mum frequency, use the oscilloscope horizontal
position control to move the display so that the right end of

the sweep can be viewed.

b. CHECK-that the FREQUENCY Hz dial reads 10 at
the point where the frequency of the output signal ceases
to increase.

c. If the dial does not read 10, loosen the two setscrews
on the brass collar behind the dial and panel; then position
the dial to 110 while holding the potentiometer shaft with

needle-nose pliers. Re-tighten the setscrews.

7.

X.l

Control Settings:

FUNCTION
FREQUENCY Hz Near 1

a. Set the oscilloscope to display one full triggered

square-wave cycle over 10 graticule divisions.

b. ADJUST-R45 (X.l Symmetry) so that the
going and negative-going portions of the signal are of
equal duration. Switch the oscilloscope triggering slope
repeatedly from plus to minus while making final ad-

justments to R45.

.I). For ease in determining the point of

Symmetry Adjustment

Square wave

positive-

f2

a. Connect the FG 501 output through a 50

C2

cable and 50
waveform is also to be displayed on an oscilloscope, insert
a tee connector between the 50
inputs to the counter and oscilloscope).

Time base
Triggering

b. ADJUST-R20 (XI0 Cal) for a counter reading of

10,000 (an oscilloscope display of approximately one

cycle per division).

9.

XI

Calibration

Control Settings:

FREQUENCY Hz 1

Time base 1 ms

a. Connect the FG 501 through a 50
and 50
inputs of the counter and oscilloscope to the tee connec­tor.

1.0000 (note an oscilloscope display of about 1 cycle/divi­sion).

oscilloscope time base to

C2

b. ADJUST-R38 (XI Cal) for a counter reading of

c. Set the FG 501 FREQUENCY Hz dial to 10 and the

termination to the counter input (if the

f2

termination and the

Oscilloscope

.1 ms
Set for stable,
triggered display

Oscilloscope
(use of an oscilloscope
in this step is optional)

f2

termination to a tee connector. Connect the

.1 ms.

coaxial

coaxial cable

f2

c. Disccmnect the 50

cilloscope input connector.

Use of an oscilloscope in this step is optional.

Control Settings:

MULTI PILIER 1
FREQUEiNCY Hz 10
FUNCTION Triangle waveform

Function
Hold
Source
Trigger Level

REV

A,

MAR

1979

termination from the os-

Note

o3

Counter

1 Hz

Fully ccw
Ext
0

d. CHECK-for a counter reading of 10.000. If
neceasary, re-adjust R20 (XI0 Cal) for a 10.000 reading
(note an oscilloscope display of about 1 cycle/division).

9

e. Repeat Steps 8 and

10. 10'

Timing Adjustment

Control Settings:

MULTl PLl ER 1

FREQUENCY Hz 10

(use of an oscilloscope

in this step is optional)

Time base

Function .1 kHz

as necessary.

o5

Oscilloscope

I

YS

Counter

a. ADJUST-CIS0 (10' XI0 Timing) for a counter
reading of 1.0000 (note an oscilloscope display of about 1
cycle/division).

11.

lo5

XI

Timing Adjustment

Control Settings:

FG 501

FREQUENCY Hz 1

Oscilloscpe
(use of an oscilloscope
in this step is optional)

Time base 10 ps

Table

3-2

FG 501

FRE-

QUENCY QUENCY TI ON

d. Set the FREQUENCY Hz dial for

MULTIPLIER switch to lo3. Place a 50
the VCF INPUT connector. Set the FUNCTION switch to
square wave.

FG

1

M&T'-

1

o4

501

1

FRE-

100 Hz 0.5%

10 kHz 0.5%

100

HZ

5 kHz 0.5%

PERCENT

I

DIISTOR-

1 .OO/O

.1

and the

S2

term~ination on

-

a. ADJUST-C79 (lo5 XI Timing) for a counter
reading of
cycle/division).

12. 1

.I000 (note an oscilloscope display of about 1

o4

XI 0

Timing Adjustment (Below SN

B060000

only)

Control Settings:

MULTIPLIER 1

FREQUENCY Hz 10

a. ADJUST-C77 (1
.I000 (note an oscilloscope display of about 1 cycle/divi­sion).

13.

Sine-wave Upper and Lower Level Adjustment

Control Settings:

FUNCTION Si ne-wave

MULTl PLl ER 10

FREQUENCY Hz 10 (100 Hz)

AMPL'

PHASE

OFFSET'

a. Connect the FG 501 to the Distortion Analyzer

S2

through a 50

b. ADJUST-Upper Level Adjustment R150 and Lower
Level adjustment R170 for minimum distortion as read by
the Distortion Analyzer.

coaxial cable and 50

o4

FG 501

o4

Timing) for a counter reading of

Clockwise
In (off)
In (off)

S2

termination.

e. Disconnect the FG 501

tion from the distortion analyzer and connect them to the

input of an oscilloscope. Set the oscilloscope to display

full triggered square-wave cycle over 10 graticule

one
divisions. Switch the oscilloscope triggering slope
repeatedly from plus to minus and check the square-wave
symmetry. If it is no longer symmetrical, repeat the X.l
Symmetry Adjustment (Step 7 of this procedure).

g.

Repeat Step 13 parts c and d as necessary

14.

Triangle

DC

Level and Phase Range

OUTPUTcable and termina-

Adjustment

Control Setting:

FUNCTION Triangle
MULTIPLIER 1
FREQUENCY Hz 10

Pulse Generator

Period
Duration
Amplitude

Oscilloscope

Time base .1 ms

a. Connect the pulse generator

C2

coaxial cable and 50

50

GATE INPUT connector.

b.

Pull the FG 501 PHASE control out (on).

o4

.2

ms

.1 ms

$2 V into 50

+

S2

termination to the FG 501

S2

output through a

c. Check the distortion at the frequencies listed in
Table 3-2.

'8elow

SN

or

8130000 AMPL control

SN below 8130000 set OFFSET to zero.

is

labeled OUTPUT.

MAR

of

1979

c. CHECK-that the display is several bursts
triangle waveforms with a horizontal bar connlecting one
burst to the next. Rotate the PHASE colntrol fully

REV

14,

,,

clockwise and the horizontal bars should move to at least
the top of the triangle burst waveforms. Rotatethe PHASE
control fully counterclockwise and the horizontal bar
should move to at least the bottom of the triangle burst
waveforms.

d. ADJLJST-R135 (triangle DC Level) if operation is
not as described in Step 14 part c above (adjust for equal
movement of bar above and below the burst waveforms).

e.

Repe'at parts c and d above as necessary.

f. Returin the PHASE knob to

g. Disconnect the cable and termination from the
pulse generator and FG 501 GATE INPUT.

15.

Adjust Output Balance

Control :Settings:

O0

and press it in (off).

(SN

B130000 and up)

Minimum Output (ccw)
In (off)

a. Connect a 10X probe from the oscilloscope to test
point 6 (if TP6 is not present use point A, the circuit board
pad below C77 and right of
clip to chassis ground.

b. Set FREQUENCY Hz for maximum frequency as

viewed on test oscilloscope.

c. Set oscilloscope Vertical input coupling to ground
and use Position control to vertically center t he trace at the
center horizontal graticule line. Return input coupling to
dc.

d. ADJUST-R195 (f4.5 volts
positive peaks on the display extend 2.25 divisions above

the graticule center.

e. ADJUST-R205 (-4.5 volts
negative peaks on the display extend 2.25 divisions below

graticule center.

f. Repeat parts d and e as necessary.

6.

Triangle DC Level

a. Move probe tip to TP7 (emitter of Q38).

R251). Connect probe ground

%

Ampl) so the

%

Ampl) so the

Oscilloscope

Volts/div .1 V

a. Center the oscilloscope trace.

-

b. ADJUST-output balance control R274 until the

trace is centered on the screen of the oscilloscope.

c. Disconnect all test equipment.
This completes the FG 501 adjustment procedure.

PROCEDURE

(SN

BELOW

Steps 1 through 4: perform Steps

for SN B020000-up on page 3-4 except refer to Fig. 3-2.

5.

Adjust

Control Setting Changes:

MULTI PLI ER 1

Volts/Div 0.2 V
Vertical Input Coupling Dc
Triggeri rig Auto
Time Base 1 ms d. ADJUST-R99
I ntensity, Level

&

'8elow

--

2~or

-4-4.5

Volts Triangle Amplitude

Oscilloscope

Positiom For visible, triggered display vertically centered.

SN

8130000 AMPL control

SN

below 8130000 set OFFSET to zero.

FG

501

B020000)

1

through 4 as shown graticule.

o2

is

labeled OUTPUT.

b. ADJUST-R135
extends an equal distance above and below graticule
center.

7.

Gate Centering

a. Move the

b. Use vertical position control to center the display on

the graticule.

c.

Move the probe tip to TP4 (center tap of Gate

Centering R95).

d. ADJUST-R95 to re-center the display on the

e. Disconnect the probe tip and ground clip from the

FG 501 and disconnect probe from oscilloscope.

8.

Square Wave Amplitude

a. Connect a 50

connector to a 50

vertical input connector.

b. Set OFFSET and OUTPUT for a
c. Set FUNCTION to

display. If necessary, adjust OFFSET to keep display

10X probe tip to TP5 (Q85 base).

(

%

DC Level) so the display

C2

cable from the FG 501 OUTPUT

C2

termination at the oscilloscope

6

division display.

%

(square wave).

(

'L

Ampl Cal) for a 6-division

REV A, MAR

1979

9.

Square-Wave High Frequency Compensation

Control Setting Changes:

b. ADJUST-R45 (X.l Sym) so the upper and lower
portions of the displayed square wave are of equal
duration.

--

Oscilloscope

Time Base

&

Triggering

a. ADJUST-C281

and square corner on the display.

10.

Dial Calibration

Control Setting Changes:

FUNCTION
FREQUENCY Hz Maximum displayed

Time base 1 mddivision

a. CHECK-that the FREQUENCY Hz dial reads 10; if

not, perform part b.

b. Loosen the two set screws on the brass collar
behind the FREQUENCY Hz knob. Hold R25 shaft with
pliers to maintain maximum frequency display while
rotating dial to read 10, then tighten screws.

11. XI0

a. ADJUST-R20 (XI0 Cal) for 1 triangle wave-

form/division.

12. X1

base for 10 mddivision.

Calibration

a. Set FREQUENCY Hz to 1 and oscilloscope time

Position As Required

(

Oscilloscope

Calibration

2 Ps

%

HF Comp) for best flat top

FG

501

41

(triangle waveform)

frequency

14.

lo5

XI0

Timing

Control Setting Changes:

%

FUNCTION

MULTIPLIER 1

FREQUENCY Hz 10

Oscilloscope

Time base

a. ADJUST-C19O (lo5 XI0 Timing) for one triangle

waveform/division.

15.

lo5

XI

Timing

a. Set FREQUENCY Hz to 1 and oscilloscope time

base for 10 psldivision.

b. ADJUST-C79
waveform/division. Repeat steps 14 and
for best cali bratisn.

16.

lo4

XI0

Timing

a. Set MULTIPLIER to lo4, FREQUENCY HZ to 10, and

oscilloscope time base for 10 ,&division.

b. ADJUST-C77 (lo4 XI0 Timing) for one triangle

waveform/division.

c. Disconnect the 50

cilloscope input.

(lo5 XI Timing) for one triangle

!2

(triangle)

o5

1 &division

15

as necessary

termination from the os-

b. ADJUST-R38 (XI Cal) for one triangle wave-

form/division.

c.

Set FREQUENCY Hz to 10 and oscilloscope time

base for 1 ms/division.

d.

CHECK-for one triangle waveform/division. If not,

readjust R20 and repeat parts a through d for best

calibration.

13. XI

(square-wave). Set oscilloscope time base for 10 ms/divi­sion.

Symmetry

a. Set MULTIPLIER to

lo3

and FUNCTION to

'L

17.

Upper and Lower Sine-Wave Level

Control Setting Changes:

FUNCTION

MULTIPLIER

FREQUENCY Hz 1

C2

a. Connect the 50
the distortion analyzer input.

b. ADJUST-R150
Lower Level) for a minimum distortion reading on the
analyzer.

termination on OUTPUT cable to

(

z

(sine wave)

i

o4

%

Upper Level) and R170

@

MAR

(

'L

1979

'7

MAINTENANCE AND

Section

4-FG

501

INTERFACING

PREVENTIVE MAINTENANCE

Preventive
basis will enhance the reliability of the
checks of the semiconductors in the absence of a
malfunction are not recommended as preventive
maintenance measures. The recommended time for per-

forming preventive maintenance is just before instrument

adjustment.

Cleaning

maintenance

CAUTION

steps performed on a regular

FG

501. However,

a

Do not use acetone, MEK, MIBK, benzene, toluene,
carbon tetrachloride, trichloroethylene, methyl

alcohol, methylene chloride,

Freon com,uounds for cleaning the

clean water and a mild detergent.

sulphuric acid, or

FG

501.

Use only

INFORMATION

TROUBLESHOOTING AIDS

Circuit Descriptions

Section 5 of this manual explains circuit operation in
detail. Used conjointly with the circuit diagrams, the
section can be a powerful analytic tool.

Diagrams

A block diagram and detailed circuit diagrams are

located on foldout pages in the diagrams section. The

circuit diagrams show the component values and

assigned circuit reference numbers of each component.

The first page of the Diagrams section defines the circuit

symbols and reference designators used in the manual.
Major circuits are usually identifiable by a series of

l

component numbers.
may be shown within the diagrams,
aprons. Those portions of the circuits located on circuit
boards are enclosed with gray tint outline.

m portant waveforms and voltages

or on adjoining

-

Exterior.

or dry brush. Water and a mild detergent may be used;

however, abrasive cleaners should never be used.

Interior.

precede adjustment since the cleaning process could alter
the settings of calibration adjustments. Use low-velocity
compressed (air to blow off accumulated dust. Hardened
dirt can be removed with a soft dry brush, cotton-tipped
swab, or a coth dampened in a solution of water and mild
detergent.

Loose dust may be removed with a soft cloth

Cleaning the interior of the unit should

Adjustment

After cleaning or repairs, do the performance check as
described in Section
within specification, no adjustment is needed. If one or
more of the specifications are not met, calibrate the
instrument as directed in Section 3, Adjustment.

2

of this manual. If all functions are

Lubrication

No lubrication is required in the

FG

501.

Cam Switch Charts

Cam switches shown on the diagrams are coded on
comprehensive charts to locate the cam number of the
switch contact in the complete switch assembly, counting
from the front, or knob end, toward the rear of the switch.
The charts also indicate with a solid dot when each

contact is closed.

Circuit Board Illustrations

Line illustrations showing component locations keyed

with a grid locator and table are placed on the back of a

foldout page and sequenced as closely as possible to the

related circuit diagrams.

To identify electrical components when trouble­shooting, turn to the appropriate Parts Location Grid in
the Diagrams section. Component values, descriptions,
and ordering data are given in the Replaceable Electrical

Parts list.

Component and Wiring Color Codes

Colored stripes or dots on electrical components
signify electrical values, tolerances, etc. according to EIA
standards. Components not color coded usually have

information printed on the body. Some wiring coding

follows the same EIA standards.

REV

A,

MAR

1979

Maintenance and Interfacing Information-FG

501

Testing Equipment

Generally, a wide-band oscilloscope, a low-

capacitance probe, and a multimeter are all that is needed

to perform basic waveform and voltage checks for

diagnostic purposes. The calibration procedure and per­formance check procedure list specific test equipment

necessary to adequately check out the instrument.

TROUBLESHOOTING TECHNIQUES

This troubleshooting procedure is arranged in an order

that checks the simple trouble possibilities before

proceeding to extensive troubleshooting.

Control Settings

lncorrect control settings can indicate a trouble that

does not exist. If there is any question about the correct

function or operation of any control, see the operating

instructions in Section

If the FG 501 is operating as part of an interconnected
system or test setup, also check control settings of the
other instruments in the setup. Check for proper inter­connections between the power module and the plug-in
modules. Check that the signal is properly connected and

that the interconnecting cables and signal source are not

defective. Check the power source.

1.

lncorrect operation of all circuits often means trouble

in power supplies. Using a multimeter, check first for
correct voltages of the individual regulated supplies
according to the circuit diagrams and adjustment
procedures. Then check the unregualted supplies of the
power modules. Defective components elsewlhere in the
instruments can appear as power supply problems. In

these instances, suspected circuits should be dis-

connected from apparently bad power supplies one at a

time to narrow the search.

Voltages end Waveforms

Often defective components can be

waveform and voltage indications wher
the circuit diagram or in the adjustment
waveforms and voltage labels are typical indications and

will vary between instruments.

located by using

i

they appear on

xocedures. Such

I

Component Checking

If a component cannot be disconnected from its circuit,

the effects of the associated circuitry must be considered

when evaluating the measurement. Except for soldered-in
transistors and integrated circuits, one end of most

components can be unsoldered and lifted from the circuit

board.

Transistors and lntegrated Circuits (IC).

power switch off before removing or replacing any
semiconductor.

Turn the

-

If the power module is suspected, try substituting
another FG 501 known to be good into t he power module.
If the trouble persists after substitution, move the FG 501

to another compartment in the power module to determine

if the trouble is confined to one compartment or is
common to all of them.

Visual Check

Remove the covers from the FG 501 and look for
broken wires, loose or unsoldered connections, damage
to the circuit board, and the like. If components damaged
from overheating are found, determine the cause of
overheating before replacing the component; otherwise,
the new component may also be damaged.

Circuit Isolation

Note the symptom. It often identifies the circuit in

which the trouble is located. When trouble symptoms

appear in more than one circuit, check the affected

circuits by making waveform and voltage measurements.

A

good check of transistor operation is actual perfor-

mance under operating conditions.
effectively be checked by substituting a new component
for it (or one which has been checked

However, be sure that circuit conditions are not such that a

replacement transistor might also be damaged. If sub­stitute transistors are not available, use a dynamic tester.

Static-typetesters are not recommended since they do not
check operation under simulated operating conditions.
wick-type desoldering tool can be used to, remove
soldered-i n transistors.

lntegrated circuits can be checked with a voltmeter,

test oscilloscope, or by direct substitution.,

understanding of the circuit description is essential to
troubleshooting circuits using integrated circuits.

Operating waveforms, logic levels, and other operating

information for the integrated circuits are given in the

circuit description information. Use care when checking
voltages and waveforms around the integrated circuits so
that adjacent leads are not shorted together.

meansofclippingatestprobetothe14-and16-pinin-line

integrated circuits is with an integrated circuit test clip.
This device also doubles as an extraction tool.

A

transistor can most

pcreviously).

A

good

A

convenient

A

-

REV A, MAR

1979

Maintenance and Interfacing Information-FG

501

Diodes.

Do not use an ohmmeter that has a high

2. Instrument Serial Number (for example, B010251).

internal current. High currents may damage the diode, so

3.

use the RX-1000 scale on the ohmmeter.

--

Ordinary signal diodes may be checked for an open or

A description of the part (if electrical, include the

circuit number).

4.

Tektronix part number.
shorted condition by measuring the resistance between
terminals.
resistance should be very high in one direction and very
low when the leads are reversed.

Resistors.

VVith the ohmmeter set to the RX1000 scale, the

Check resistors with an ohmmeter. Resistor

Please do not return any instruments or parts before

receiving directions from Tektronix, I nc.

A listing of Tektronix Field Offices, Service Centers,
tolerances are given in the Replaceable Electrical Parts and Representatives can be found in the Tektronix
list. Resistors do not normally need to be replaced unless

Product Catalog and Supplements.

the measured value varies widely from the specified value.

Capacitors.

A leaky or shorted capacitor can be

detected by checking resistance with an ohmmeter on the

highest scale. Use an ohmmeter which will not exceed the
voltage rating of the capacitor. The resistance reading
should be high after initial charge of the capacitor. An
open capacitor can best be detected with a capacitor

Replacing

The exploded view drawings associated with the

Replaceable Mechanical Parts list, located at the rear of

the manual, may be especially helpful when dkassembl-

ing or reassembling individual components or sub­assemblies.

tester, or by checking whether it passes ac signals.

Circuit Boards.

If a circuit board is damaged beyond

repair, the entire assembly, including all soldered-on

PARTS ORDERING AND REPLACING

components, can be replaced.

Ordering

Standard Parts.

can be obtained through your local Tektronix field office
or representative. However, you should be able to obtain
many of the standard electronic components from a local

commercial source in your area. Before you purchase or
order a part from a source other than Tektronix, Inc.,
please check the electrical parts list for the proper value,
rating, tolerance, and description. When selecting
replacement parts, it is important to remember that the
~hvsical size and shaoe of the com~onent may affect its

I-

performance in an instrument.
should be direct replacements unless it is known that a
different component will not adversely affect the instru­ment performance.

Special Parts.

selected by Tektronix, Inc., to satisfy particular re­quirements,, or are manufactured for Tektronix, Inc., to our
specifications. Most of the mechanical parts used in this
system have been manufactured by Tektronix, Inc. Order
all special parts directly from the local Tektronix Field
Office or representative.

Ordering Procedure.

from Tektronix, Inc., please include the following

minimum information:

-

1. Instrument Type (FG 501).

Most electrical and mechanical parts

A~I

replacement parts

Some parts are manufactured or

When ordering replacement parts

To remove or replace a board, proceed as follows:

1. Disconnect all leads connected to the board (both

soldered lead connections and solderless pin connec­tions).

2.

Remove all screws holding the board to the chassis

0'

0th mounting surface. Remove any knobs, etc., that

prevent the board from being lifted out of the

instrument.

3.

Lift the circuit board out of the unit. Do not force or

bend the board.

4.

To replace the board, reverse the order of removal.
Use care when replacing pin connectors; if forced into
place mis-aligned, the pin connectors may be damaged.

Transistors and Integrated Circuits.

Transistors and
integrated circuits should not be replaced unless they are
actually defective. If removed from their sockets during
routine maintenance, return them to their original sockets.
Unnecessary replacement or switching of semiconductor
devices may affect the calibration of the instrument. When
a transistor is replaced, check the operation of the part of

the instrument that may be affected.

REV

A,

MAFI

1979

Maintenance and Interfacing Information-FG 501

Replacement semiconductors should be of the original
type or a direct replacement. Figure 4-1 shows the lead
configuration of the semiconductors used in this instru­ment system. When removing soldered-in transistors, use
a suction-type de-soldering tool to remove the solder from
the holes in the circuit board.

An extracting tool should be used
16-pin integrated circuits to prevent damage to the pins.
This tool is available from Tektronix, Inc. Order Tektronix
Part No. 003-061 9-00. If an extracting tool is not available,
use care to avoid damaging the pins. Pull slowly and
evenly on both ends of the integrated circuit. Try to avoid
having one end of the integrated circuit disengage from
the socket before the other end.

Cam Switches.

undertaken only by experienced maintenance personnel.
Switch alignment and spring tension of the contacts must
be carefully maintained for proper operation of the switch.
For assistance, contact your local Tektronix Field Office
or representative.

Repair of cam-type switches should be

toremove the 14- and

4.

To remove the
block, remove the retaining ring from theshaft on the front
of the switch and slide the cam drum out of ,the support
block. Be careful not to lose the small detent roller.

5.

To replace defective switch contacts, follow the
instructions given in the switch repair kit.

6. To re-install the switch assembly, reverse the above

procedure.

Incandescent Bulbs.

on the sub-panel using a plastic sleeve. Unsollder the lead
wires and pull the bulb out of the sleeve from the rear of the
su b-panel

.

cam

drum from the front support

The POWER light bulb is mounted

Customizing the Interface

Input and output access to the FG 501 isava.ilable at the
rear of the main circuit board. Fig. 4-2 identifies the
contacts and their respective I/O assignments.

-

NOTE

A

cam-type switch repair kit including necessary

tools, instructions, and replacement contacts is

available from

NO.

040-0541

The cam-type switches consist of rotating cam drums,

which are turned by front-panel knobs, and sets of spring-

leaf

contacts

contacts

switches can be disassembled for inspection, cleaning, position
repair, or replacement as follows:

metal switch covers apart far enough to where they will
slip past the detents and come off. The switch is now open
for inspection or cleaning.

2. To completely remove a switch from the circuit

board, first remove any knobs or shaft extensions. Loosen
the coupling at the potentiometer at the rear of theswitch,
and pull the long shaft out of the switch assembly.

3. Remove the screws (from the opposite side of the

circuit board) which hold the cam drum to the board.

are

Using both

Tektronix, Inc. Order Tektronix Part

-00.

mounted

actuated

on

adjacent circuit

by

lobes

pull

the

on

the

bottom

cams.

edges

The

These

of

the

A

power module mainframe option (Olption 2) is
available that provides a rear-panel, multi-pin connector
to which
Also possible are intra-compartment connections with
other plug-in modules in multiple-compartment main­frames.

identifies the
family. If the interface is customized, insert a barrier in the

prevent other than signal source plug-ins from being used

in that compartment. This protects the plug-in should

specialized connections be made to that compartment.

I/O lines can be hard-wired for external access.

A

slot between pins 23 and 24 on the rear connector

FG

501 as a member of the sig~nal source

the

Building A 'ystem

manual

for

further

REPACKAGING FOR SHIPMENT

If the Tektronix instrument is to be shipped to a
Tektronix Service Center for service or repair, attach atag
showing: owner (with address) and the name of an
individual at your firm that can be contacted. Include
complete instrument serial number and a description of
the service required.

the

power jack

section

information-

of

the

-

power

REV

A,

MAR

1979

Maintenance and Interfacing Information-FG 501

Plastic-Cased Transistors

FET'S

Metal-Cased Transistors

lntegrated Circuits l ndexing

Power Transistors

Fig.

lntegrated Circuits Mounting

4-1.

Semiconductor device lead configurations found in the

FG

501.

Maintenance and Interfacing Information-FG

501

ASSIGNMENTS

FUNCTION CONTACT

TRIGGER OUTPUT COMMON

TRIGGER OUTPUT

GATE IN COMMON 25B

GATE IN 24B

VCF IN COMMON 22B

VCF IN 21 B

I

238

+

Y

k

r-

H

ASSIGNMENTS

1

CONTACT FUNCTION

k

H

I

I

I

I

I

I

I

I

28A OUTPUT
27A OUTPUT COMMON

SPECIALIZED FAMILY KEY

14A

Fig.

4-2.

Input/output assignments at rear interface connector, rear view.

Save and re-use the package in which your instrument

was shipped. If the original packaging is unfit for use or

not available, repackage the instrument as follows:

Surround the instrument with polyethylene sheeting to
protect the finish of the instrument. Obtain a carton of
corrugated cardboard of the correct carton strength
and having inside dimensions of no lessthan six inches

more than the instrument dimensions. Chshion the
instrument by tightly packing three inches of dunnage
or urethane foam between carton and i nstrcilment, on all
sides. Seal carton with shipping tape or industrial
stapler.

The carton test strength for your instrurnent is

pounds.

200

Section

5-FG

CIRCUIT DESCRIPTION

Introduction

The following is a description of the electrical circuits in the
diagram and the detailed schematic diagrams on the foldout pages at the back of the manual to aid in
understanding this description.

FG

501. Refer to the simplified block

501

LOOP

Triangle Waveform Generation

Operatiorlal amplifiers U45 and U48 in conjunction with

Q45A/B and Q48A/B are voltage followers. Thus, the
voltage at pin 3 of U45 and U48 is also present at the
emitters of Q45A/B and Q48NB. Switch S50

(MULTIPLIER) and resistance network R53 through R60

provide constant current to the emitters of
toget her with U45, compose a positive current source t hat

charges the timing capacitor selected by S50 (C72
through C79). Resistor network R63 through R70 provides

constant current to the emitters of Q48NB that, together
with U48, compose a negative current source that also

charges the timing capacitor selected by S50.

The current sources for the operational amplifiers and

the timing capacitor are separate. Thus, input current

-

requirements of the amplifiers have little effect upon the

timing current supply.

current sources. Q45A supplies approximately 70 nA to

U45 input (the remaining current goes to ground), while

Q45B suppliles charging current to the timing capacitor.

The current switch, composed of CR100 through
CR103 and emitter-coupled transistors Q85 and (290,
determines whether the positive current source or
negative current source charges the timing capacitor. For
example, if C:R100 is turned off, all the current from Q45B
goes through CR102 to charge the timing capacitor in the
positive direction at a linear rate. Emitter follower Q138
passes the linear ramp through divider network
R190/R191 and to pins 3 and 5 of upper and lower level
comparators U195NB. The voltage at pin 2 of U195A sets

the upper hysteresis. The voltage at pin 6 sets the lower

hysteresis. With CR100 off, U195A is in the negative state
until the ramp at pin 3 reaches +1.77 V; then the output at
pin 10 goes positive. The output of inverting amplifier
U80C then goes negative, which causes nor gate U80D
output to go positive. Thus, pin 9 of lower-level com­parator UI9EiB goes positive, which enables lower-level
comparator U195B. Consequently, emitter-coupled
switch Q85 turns on. The collector of Q85 moves in the
negative direction, which turns on

-

CRIOI. Thus., the negative current source now chargesthe

Q45A and Q45B are identical

Q45A/B which,

CR100 and turns off

GENERATOR

timing capacitor and the ramp starts to go negative at a
linear rate. Again, the ramp is applied to the divider
network R190/R191, and to pin 5 of U195B. When the ramp
reaches -1.77 V, the output at pin 10 of U195B goes
negative. This causes the output of U80C to go positive,
pin 13 of U80D goes negative, Q85 turns off, and Q90turns
on. CRlOl turns on again, while CRlOO turns off. This
action is repeated to form a triangle waveform output from
the loop generator. Theslope (frequency) of thetriangle is
determined by how much current the positive and
negative current sources provide to the timing capacitors.

Potentiometer R25 (FREQUENCY Hz) provides

approximately 10 V to pin 3 of voltage follower U30. The

output of U30 is fed to pin
U15 where it is summed with an offset voltage (ap­proximately -7 V) from potentiometer R38

any VCF input applied to J10. Voltage summing amplifier

U15 has an output range of +7 to +I7 V which drives the
positive current source. This 10 V swing across the timing
resistors provides a wide current (frequency) range.

The negative current source is also driven by the

positive voltage output of U15. However, the polarity is
reversed by inverting
change at pin 3 of U48 in the negative current source very
closely tracks that at pin 3 of U45 in the positive current
source. Low frequency symmetry is
tiometer R45 (X.l Sym).

Frequency Switching

Frequency (decade) switching from 1 Hz to 1 MHz is

accomplished by changing timing capacitors, and from

1

Hz to 0.0001

External Voltage-Controlled Frequency (VCF)
Mode

Voltage-controlled frequency is accomplished by
applying a voltage to J10 (VCF INPUT) which is summed
with the voltage set by R25 (FREQUENCY Hz). Subse­quently, the current to the timing capacitor is changed,
which changes the generator output frequency as

described under

Hz

2

of voltage summing amplifier

(XI Cal) and

amplifier U40. Thus, the voltage

adjustable by poten-

by changing timing resistors.

Triangle Waveform Generation.

0 V to

REV A, MAR 1979

Circuit Descri ption-FG

501

Level Shifting

Level shifting occurs in the circuit composed of (2125
and Q130. Q130 is a current source for Q125. Q130 also
ensures that any bias across source follower Q120 is
dropped across R127, which shifts the level of the input to
the sine shaper circuit

(f7.5 V to -7.5

V).

(Q150 and Q170) with respect to 0

V

Sine Waveform Generation

The sine shaper is composed of Q150, Q170, and an

associated divider-diode network. The resistor network
composed of R155, R156, R158, R160, and Rl62 forms a
voltage divider with a diode connected to each junction. In

series with the diodes are resistors R157, R159, Rl61, and

A

R163.
turn on the diode with the least current first; in this case,

CR162. Diode CR162 has the least effect on the incoming

ramp. Each successive diode has a greater effect. CR155

has the maximum effect since there is no resistor at its

anode end. Thus, the peaks of the triangle waveform are

clipped harder than are the remaining portions. The

reverse is

Q170 and its associated divider-diode network. Poten­tiometers R150 (Upper Level) and R170 (Lower Level) at
the bases of Q150 and Q170adjust for minimum distortion

of the sine shaper output. Thus, a sine waveform is derived

from the triangle waveform.

positive-going ramp from the emitter of (2138 will

trbe of the negative half of the sine shaper, i.e.,

generator is functioning. However, a positive voltage at
pin 12 of

In normal operation with no external gating signal at
J215 (GATE INPUT), transistors Q80 and gate amplifier
(2225 are on (saturated), which holds phase clamp switch
(2230 off. When (2230 is off, the phase clamping circuit

(composed of U235 and current boosting transistors Q240
and
Q120. Assume that switch S245 (PHASE) is closed and a
square wave is applied to J215 (GATE INPUT). During the
positive transition of the gating signal, the loop generator
continues to run, since Q80 and (2225 are already on.
However, when the gating signal goes negative, Q80 turns
off because the input impedance of the gating input drops
to 1
of U80D is pulled up and the loop generator is disabled.

Simultaneously, Q230 turns on, which
diodes CR245 through CR248. The gate of source follower

Q120 is now clamped to the voltage set by U235 and

associated current-boosting transistors (2248 and Q242.

By adjusting the input to pin 3 of U235 with potentiometer

R235 (PHASE), the clampling voltage to the gate of (2120

can be shifted to start the triangle waveform anywhere
from +90° to -90" from the sine and triangle 0° start point.

U80D will disable the loop generator.

Q242) does not affect the gate of source follower

kC2 (R220 vs R81), and turns off Q80 and (2225. Pin 12

ako turns on

Square Waveform Generation

A square waveform output is derived by taking the

available square waveform from tne collector of current

switch driver
R105 and to switch S250 (FUNCTION).

External Gate Mode

Gating is accomplished by applying an external signal
to J215 (GATE INPUT) and closing S245 (PHASE). As
long as pin 12 of nor gate

Cam switch S250 (FUNCTION) selects a triangle, Assume that a triangle waveform is selelcted by S250
square, or sine waveform and feeds it to the output
amplifier.

Transistors (2250 and Q255 are complementary emitter operational amplifier. Its gain is determined by input
followers that offset (via R281 and Q276) any differential

between the input and output voltage and provide provides the positive input. Now, when Q270turns on (i.e.,

temperature compensation.

Q90 and feeding it through divider R102-

U80D is near ground, the loop

OUTPUT

Hold Mode

Cam switch S50 (MULTIPLIER) has three positions
between the three lowest frequency range settings that
stop the triangle waveform at its instantaneous voltage
level (i.e., the timing capacitor charge holds at its instan-

taneous level) until S50 is switched back to a range

position. The hold contacts on cam switch S50 are
normally closed.

AMPLIFIER

(FUNCTION). The triangle waveform voltage applied to
the output amplifier is varied in amplitude by

tiometer R260A (OUTPUT), then summed with the current
through R268. The output amplifier is basically an

resistor R279 and feedback resistor
a positive voltage is applied to its base), Q290 turns on

R281. Transistor Q270

poten-

-

Circuit Description-FG

501

which turns on (2295 and pulls the output up. If Q276 turns
on (i.e., Q2TO turns off when a negative voltage is applied

to its base), Q280 turns on, which turns on Q285.

Consequenl:ly, Q298 turns on and pulls the output down.

-

-

R298 establishes the source impedance of the output.
Potentiometer R274 provides an adjustment for dc
balance.

Pulse and Ramp Generation

Switch S250 (FUNCTION) also applies pulses and

ramp waveforms to the output amplifier.

POWER SUPPLIES

i-20 V Reflerence Supply

The +20 V Supply is the reference for all the supplies.

Diode bridge network CR400 and capacitor C400 convert

V

the raw 25

is then fed to the 4-20 V Reference Supply. Field effect

transistor (2400 along with R405 compose a constant

current source for 6.2 V Zener diode VR405. VR405 is

temperature compensated at approximately 7

potentiometer R400 (Reference Current) is adjusted for

7 V across R405, which then establishes the 6.2 V

-

reference for non-inverting operational amplifier U410.
Negative feedback is provided through resistor network

R4lO-R415. Potentiometer R4l5 ($20 Volts) is adjusted
for +20 V output. When output current exceeds 200 mA,
sensing resistor R417 in the emitter of series pass
transistor Q410 turns Q415 on, which pulls down the base
of Q410

+20 V Decoupled Supply

Voltage follower U420, in conjunction with current
booster Q420, drives the series pass transistor in the
power module. Current sensing resistor R424 turns on
(2424 when output current exceeds 400 mA, which pulls
down the base of Q420 and shuts off

Supply.

-20 V Relerence Supply

The -20 V Supply consists of inverting operational
amplifier U#480. Input resistor R481 and feedback resistor
R482 are O:lO/o, thereby ensuring that the-20 V Reference
Supply accurately follows thei-20 V Reference Supply. As
in the +201 V Reference Supply, series pass transistor
Q488, current sensing resistor R487, and transistor Q485

- -

provide overcurrent shutdown (in excess of 200 mA).

ac from the power module to+33 V dc, which

and shuts the +20 V Supply off.

the+20 V Decoupled

mA when

When a positive or negative ramp waveform is selected

by S250, a lower resistance is switched into the positive or

of

negative current sources, depending on the polarity
selected ramp waveform. For instance, if the positive
current source had the least resistance, then current
would increase in that source and consequently increase
the slope of that particular side of the ramp. The reverse is
true if the negative current source has the least resistance.

Positive or negative pulses are obtained by changing
the duty cycle of the square waveform. The output pulse is
derived from the "on" portion of the square waveform. The
triangle generator frequency determines the frequency of
the square waveform and, thus, the pulse frequency.

the

-20 V Decoupled Supply

Voltage follower U470 with its associated current

booster Q472 and current sensing resistor R473 operate

identically to the +20 V Decoupled Supply.

+I7

V

Supply

Voltage follower U430 with voltage divider R430/R431

compose the +17 V Supply. Divider R430-R431 es-

tablishes +17 V at pin 3 of U430, while feedback is

supplied to pin 2 from current booster (2430. There is no

in

the

17

current sensing resistor

voltage for the 17 V Supply is supplied by the 4-20 V

Reference Supply, which has overcurrent protection.

-17

V

Supply

The -17 V Supply consists of inverting operational
amplifier U460, current booster Q468 and 0.1% resistors
R464 and R465 which provide an accurate -17 V with

+

respect to the

+5

v

Supply

Divider R441-R442 provides +5 V to pin 3 of voltage
follower U440. If excessive current is drawn, current
sensing resistor R446 turns on Q447 which pulls down the
base of current booster Q445 and shuts off the +5 V
Supply. The collector of

+I

1.5 V from the Power Module.

-5

v

Supply

The -5 V Supply consists of emitter follower Q450. No
current limiting is provided since the collector is tied to the
current limited -20 V Reference Supply. Diode CR450

provides temperature compensation for Q450.

17 V Supply.

(2445 connects to the unregulated

V Supply since the

OPTIONS

Section

6-FG

501

There are no options for the

FG

501

at this time.

REPLACEABLE

ELECTRICAL PARTS

PARTS ORDERING INFORMATION

.

Replacement parts are available from or through your local Tektronix, Inc. Field Office

or representative.

Changes to Tektronix instruments are sometimes made to accommodate improved

components as they become available, and to give you the benefit of the latest circuit

improvements developed in our engineering department. It is therefore important, when
ordering parts, to include the following information in your order: Part number, instrument
type or number, serial number, and modification number if applicable.

If a part you have ordered has been replaced with a new or improved part, your local
Tektronix, Inc. Field Office or representative
number.

will contact you concerning any change in part

Section

7-FG

501

Change information,, if any, is located at the rear of this manual

SPECIAL NOTES AND SYMBOLS

XOOO Part first added at this serial number

OOX Part removed after this serial number

ITEM

NAME

In the Parts List, an ltem Name is separated from the description by a colon

Because of space limitations, an ltem Name may sometimes appear as incomplete. For
further ltem Name identification, the U.S. Federal Cataloging Handbook H6-1 can be
utilized where possible.

(:).

ABBREVIATIONS

ACTR
ASSY
CAP
CER
C KT
COMP
CONN
ELCTLT
ELEC

INCAND
LED
NONWIR

ACTUATOR
ASSEMBLY
CAPACITOR
CERAMIC
CIRCUIT
COMPOSITION
CONNECTOR
ELECTROLYTIC
ELECTRICAL

INCANDESCENT

LIGHT

EMITTJNG DIODE

NON

WIREWOUND

PLSTC
QTZ
RECP
RES
RF
SEL
SEMICOND
SENS
V AR
WW
XFMR
XTAL

PLASTIC
QUARTZ

RECEPTACLE
RESISTOR
RADIO FREQUENCY
SELECTED
SEMICONDUCTOR
SENSITIVE
VARIABLE
WIREWOUND
TRANSFORMER
CRYSTAL

W.

F OCT.

1975

Replaceable

Mfr.

Code

Electrical Parts-FG

501

CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER

Manufacturer

SANGAMO ELECTRIC CO., S. CAROLINA DIV.
ALLEN-BRADLEY COMPANY
SPECTROL ELECTRONICS CORPORATION
RCA CORPORATION, SOLID STATE DIVISION
MOTOROLA, INC., SEMICONDUCTOR PROD. DIV.
TRI-ORDINATE CORPORATION
UNION CARBIDE CORPORATION; MATERIALS
SYSTEMS DIVISION
TELEDYNE SEMICONDUCTOR
SPECIALTY CONNECTOR CO., INC.
AMPEREX ELECTRONIC CORP., COMPONENT DIV.
SPRAGUE ELECTRIC CO.
CTS COW.
CHICAGO MINIATURE: LAMP WORKS
ERIE TECHNOLOGICAL PRODUCTS
BECKMAN INSTRUMENTS, 1NC.I HELIPOT DIV.
BUNKER-RAMO CORP., THE AMPHENOL
TRW ELECTRONIC COMPONENTS, IRC FIXED
RESISTORS, PHILADELPHIA DIVISION
TEKTRONIX, INC.
INTERNATIONAL RECTIFIER COW.
TRW ELECTRONIC COMPONENTS, TRW CAPACITORS
MALLORY CAPACITOR CO., DIV. OF

AND

P. R. MALLORY

CO., INC.

DALE ELECTRONICS, INC.
KINGS ELECTRONICS CO., INC.

,

INC

.

RF

DIV.

Address

0

BOX

P

1201
17070

ROUTE

5005
343

11901
12515
3560
35

1142
4433
644
2500
33

401

P

9220
112

3029

P
P.

40

128

2ND STREET SOUTH

EAST GALE AVENUE

202

E MCDOWELL RD,PO BOX

SNYDER AVENUE

MADISON AVENUE
CHADRON AVE.

MADISON AVE.

HOFFMAN AVE.

W.

BEiWDSLEY AVE.

RAVENSWOOD AVE.

W. 12TH ST.

HARBOR BLVD.

E. FRANKLIN ST.

N. BROAD ST.

0

BOX

500

SUNSET BLVD.

W. FIRST ST.

E WASHINGTON STREET

0

BOX

372

0.

BOX

609

MARBLEDALE ROAD

20923

City, State,

PICmNS, SC
MILWAUKEE, WI

Zip

29671

53204

CITY OF INDUSTRY, CA
SOMERVILLE, NY
PHOENIX, AZ

08876

850316

BERKELEY HEIGHTS, NJ

46514
60640

16512

,

CA

06810

44.101

90.250

11787

MA

101247

92 16 34

9'7 07 7

130069

691!33

68601
10707

46227

19108

46206

CLEVELAND, OH
HAWTHORNE, CA

INDIANAPOLIS, IN
HAPPAUGE, NY
NORTH ADAMS,
ELKHART, IN
CHICAGO, IL
ERIE, PA
FULLERTON
DANBURY, CT

PHILADELPHIA, PA
BEAVERTON, OR
LOS ANGELES, CA
OGALLALA, NE

INDIANAPOLIS, IN
COLUMBUS, NE
TUCKAHOE , NY

91745

07922

REV.

I JULY

1978

Replaceable Eliectrical

Parts-FG

531

-

Ckt

Tektronix

No.

Part

6'70-2105-00 BOlOlOO B125502 CKT BOARD ASSY :MAIN
6'70-2105-01 B125503 B129999 CKT BOARD ASSY:MAIN
6'70-2105-02 B130000 CKT EOARD ASSY:MAIN
6'70-2248-00 BOlOlOO B129999 CKT BOARD ASSY:FUNCTION
6'70-2248-01 B130000 CKT BOARD ASSY:FUNCTION

295-0126-00 BOlOlOO B119999

SerialIModel

No.

Eff

BOlOlOO

Dl25503

XB060000

B090000

No.

Dscont

CAP.SET,MTCHD:10,1,0~110.01UF1990PF

CAP. ,VA:R,CER DI :9-45PF, 200V
CAP.,FXD,CER DI:27PF1+/-5.4PF1500V
CAP.,FXD,CER DI:51PF15%,500V

CAP. ,VAR,CER DI:9-35PFt200V
CAP.,FXD,CER DI:0.01UF,+80-20%,l5OV

CAP.IFXD,ELCTLT:15UF120%120V
CAP.,FXD,ELCTLT:10UF120%125V

CAP.,FXDIELCTLT:1UF120%135V

Name

&

Description

MTCHD

Mf

r

Code

Mfr

Part

Nl~mber

XB060000

XI3130000

BOlOlOO
B020000

XB060000

XB110000
XB020000

BOlOlOO

B060000
BOlOlOO

XB060000

BllOOOO

BOlOlOO
BOlOlOO
B010204

XB130000

'~ndividual. timing capacitors in this assembly must be ordered by the 9-digit part number,

letter suffix and tolerance printed on the timing capacitor to be replaced.

..

suffix

-

bly.
EXAMPLE

and

the tolerance should be the same for all of the timing capacitors in the assem-

:

285-XXXX-XX

F-

The letter

REV. J JULY' 1978

Replaceable Electrical Parts-FG

501

Tektronix SerialIModel No.

Ckt No. Part No.

Eff

BOlOlOO B019999
B020000

Dl25503

BOlOlOO B019999
B020000

Dscont

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

Name

&

Description

DEVICE:SILICON130V,150MA

DEVICE:SILICON,30V,150MA
DEVICE:SILICON,30V,150MA
DEVICE:SILICON,30V,150MA

DEVICE:SILICON,DIODE ASSY

DEVICE:SILICON,DIODE ASSY
DEVICE:SILICON,DIODE ASSY
DEVICE:SILICONIDIODE ASSY

DEVICE:SILICON,30V,150MA
DEVICE:SILICONI30V,150MA

Mfr

Code Mfr Part Number

831-516E102P
196~685X0035~~1
D46454
TDC 107MO1 OWLC

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND

CONNECTORIRCPTI :BNC,FEMALE,W/HARDWARE
CONNECTORIRCPTI :FEEDTHRU
CONNECTOR BODY,:CKT CD MT,3 PRONG

CONNECTOR,RCPT,:BNC,FEMALE~W/HARDWARE

CONNECTOR,RCPT,:BNC W/HARDWARE BOlOlOO B103149

DEVICE:SILICON130V,150MA

DEVICE:SILICON130V,150MA

DEVICE :SILICONI2OOV, l5OOMA

DEVICE:SILICON,30V1150MA

DEVICE:SILICON,30V,150MA

DEVICE :SILICON

REV. G JULY 1978

Replaceable Electrical

Parts-FG

501

--

Ckt No. Part No.

Tektronix SerialIModel No.

Eff

BOlOlOO B059999
B060000

Dscont Name & Description

TRANSISTOR:SILICON,PNP,DUAL
TRANSISTOR:SILICON,NPNtDUAL

TRANSISTOR:SILICON,NPN
TRANSISTOR:SILICON,NPN,SEL

TRANSISTOR:SILICON,NPN,SEL

TRANSISTOR:SILICON,FET,MATCHED
TRANSISTOR:SILICON,NPN,SEL
TRANSISTOR:SILICON,NPN,SEL
TRANSISTOR:SILICON,NPN
TRANSISTOR:SILICON,NPN

TRANSISTOR:SILICON,PNP
TRANSISTOR:SILICON,PNP
TRANSISTOR:SILICON,NPN,SEL
TRANSISTOR:SILICON,NPN,SEL
TRANSISTOR:SILICON,NPN

FROM MPS6521
FROM MPS6521

FROM MPS6521
FROM MPS6521

FROM MPS6521
FROM MPS6521

Mfr
Code Mfr Part Number

PAIR

R10
Rll
Rl1

R13

R15

BOlOlOO B129999
B130000

BOlOlOO B129999
B130000

BOlOlOO
B130000

BOlOlOO B069999
B070000 B129999

B129999

TRANSISTOR:SILICON,PNP
TRANSISTOR:SILICON,PNP

TRANSISTOR:SILICONIFEIP-CHANNEL

TRANS ISTOR: S ILICON , NPN
TRANSISTOR:SILICON,NPN

REV.

F

JULY 1978

Replaceable

Ckt No. Part No.

Electrical

Tektronix SerialIModel No. Mfr

Parts-FG

Eff

5Q1

Dscont Name & Description Code Mfr Part Number

,FXD,CMPSN:9.1.Kp (NOM VALUE) ,SEL

RES

.

,VAR NONWIR:5K OHM,30%f0.25W

RES

.

,VAR WW:lOK OHM,5%,2W

RES

.

RES

.

,VARINONWIR:lOO OHM,20%,0.50W
,FXDIFILM:10 OHM11%10e125W

ms.

RES

.

RES

.

RES.

.

RES
RES

.

BOlOlOO B019999
B020000
BOlOlOO B019999
B020000
BOlOlOO B019999

BOlOlOO B019999

B020000

BOlOlOO B099999
BlOOOOO
BOlOlOO B099999
BlOOOOO

BOlOlOO B099999
BlOOOOO

BOlOlOO
BlOOOOO

B099999

RES

.

RES

.

RES

.

RES

.

ms

.

RES

.

RES.
RES

.

RES

.

RES

.

RES

.

RES

.

RES

.

RES

.

RES

.

RES

.

RES

.

ms

.

RES

.

RES

.

RES
RES

.

RES

.

RES

.

RES

.

315-0362-00 BOlOlOO B019999

REV.

F

(JULY

1978

Replaceable

Electrical

Parts-FG

501

Tektronix SerialIModel No.

Ckt No Name

R9 9
Rloo
Rloo
Rl02
R102

Part No.

Eff

B020000
BOlOlOO B019999X
BOlOlOO B019999
B020000

BOlOlOO B019999

B020000
BOlOlOO B019999
B020000
BOlOlOO B019999
B020000

BOlOlOO B019999
B020000

BOX0100 B099999
BlOOOOO

BOlOlOO B019999
B020000
BOlOlOO B019999

Dscont

RES.,FXD,FILM:2.74# OHM11%,0.125W
RES.,VAR,NONWIR:250 OHM130%,0.25W
RES.,FXDICMPSN:2K OHM,5%,0.25W
RES.,FXD,FILM:l.47K OHM,1%,0.125W
RES.IVAR,NONWIR:250 OHM130%,0.25W

RES.,FXD,CMPSN:5.1 OHM15%,0.25W
RES.,FXD,CMPSN:300 OHM,5%,0.25W
RES.,FXD,FILM:392 0HElIl%,O.25W
RES. ,FXD,CMPSN:lK OHMt5%,0.25W
RES.,FX3,FILM:976 OHM,1%,0.125W

RES.,FXD,CMPSN:1.8K OHM15%,0.25W
RES.,F2(DIF1LM:1.78K OHMI1%,O.l25W
RES.,FXD,CMPSN:lOO OHM,5%,0.25W
RES.,FXDICMPSN:9.1K OHM,5%,0.25W
RES. ,F2[DtCMPSN:91 OHM15%,0.25W

&

Description

Mfr

Code

Wlfr

Part Number

B020000
BOlOlOO B019999
B020000
BOlOlOO B019999
B020000

BOlOlOO B019999
B020000
BOlOlOO B019999
B020000

XB020000

BOlOlOO B019999
B020000
BOlOlOO 3019999
B020000

BOlOlOO B019999X
BOlOlOO B019999
B020000
BOlOlOO B019999
B020000

BOlOlOO B019999
B020000
BOlOlOO B019999
B020000
BOlOlOO B019999

B020000
BOlOlOO B019999
B020000

REV.

E

JULlI

1978

Replaceable Electrical Parts-FG

501

Tektronix SerialIModel No.

Ckt No. Part No. Eff Dscont Name

BOlOlOO B019999
B020000
BOlOlOO B019999
B020000

XB020000

BOlOlOO
B020000
BOlOlOO
B020000

BOlOlOO
B020000
BOlOlOO
B020000
BOlOlOO

B020000
BOlOlOO

B020000
BOlOlOO
B020000

BOlOlOO
B020000
BOlOlOO
BOlOlOO
B020000

&

Description

Mfr

Code

Mfr

Part Number

BOlOlOO B010203
B010204 B019999
B020000

BOlOlOO B019999
B020000
BOlOlOO B019999
B020000

BOlOlOO B019999
B020000
BOlOlOO B129999
B130000

XB020000

BOlOlOO B099999

BlOOOOO

RES.,FXD1FILM:24.3K OHM,1%10.125W
RES. ,VAR,NONWIR:2OK OHMI20%,1W
RES.,FXD1CMPSN:2.4K OHM15%,0.25W

REV. F

JULY

1978

Replaceable Electrical Parts-FG

501

-

Tektronix SerialIModel No.

Ckt No. Part No. Eff Dscont

BOlOlOO B129999
B1300QO

XB130000

BOlOlOO B129999
B130000

BOlOlOO
B130000
BOlOlOO
BOlOlOO

XB130000

BOlOlOO
B130000
BOlOlOO

Name

&

Description

Mf

r

Code Mfr Part Number

CB2425

CB5115

11M688
OBD
CB3005

B130000
BOlOlOO
B130000
BOlOlOO
B130000

BOlOlOO
B130000
BOlOlOO
B130000
BOlOlOO

B130000

XB130000

BOlOlOO B125502

B125503
BOlOlOO B125502
B125503
BOlOlOO B125502
B125503

BOlOlOO B125502
B125503
BOlOlOO B039999
B040000 B129999
B130000

REV.

I

JULY

1978

Replaceable Electrical Parts-FG

581

Tektronix SeriallModel No.

Ckt No. Part No.

Eff

BOlOlOO B079999
B080000

BOlOlOO B079999
B080000

BOlOlOO B019999
B020000

Dscont Name & Description

RES.,FXD,FILM:4.48K OHM,1%,0.125W
RES.,FXD,FILM:2.49K OHM,1%,0.125W

.

,VAR, NONWIRlK OHM, 0.25W

RES
RES.,FXD,CMPSN:3 OHM,5%,0.25W
RES.,FXD,CMPSN:100 OHM15%,0.25W

Mfr
Code Mfr Part Number

BOlOlOO B019999

B020000

BOlOlOO B010203
B010204
BOlOlOO B010203
B010204
BOlOlOO B010203

B010204
BOlOlOO B010203
B010204
BOlOlOO B010203

156-0067-06 B010204

ACTR

ASSY,CAM S:

RES.,VAR,NONWIR:20K OHM,20%,1W
ACTR ASSY
RES.,VAR,NONWIR:2 X 1K OHM,20%,0.50W

MICROCIRCUIT,LI:OPERATIONAL

MICROCIRCUIT,LI:OPERATIONAL
MICROCIRCUIT,LI:OPERATIONAL
MICROCIRCUIT,LI:OPERATIONAL

MICROCIRCUIT,LI:OPERATIONAL

MICROCIRCUIT,LI:OPERATIONAL
MICROCIRCUIT,LI:OPERATIONAL
MICROCIRCUIT,LI:OPERATIONAL

MICROCIRCUIT,LI:OPERATIONAL

MICROCIRCUIT,LI:OPERATIONAL

,

CAM

S

:

AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER

AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER

105-0376-00

10M654

105-0378-00
OBD

80009 156-0067-06
80009 156-006'7-00
80009 156-0067-06

REV. G JULY

1978

Replaceable Electrical Parts-FG

501

-

Tektronix SerialIModel No.

Ckt No. Part No. Eff Dscont Name & Description

MICROCIRCUIT,DI:QUAD 2-INPUT POS NOR GATE

BOlOlOO
B010204
BOlOlOO

B020000
B130000
BOlOlOO
B010204
B130000

BOlOlOO
B010204
BOlOlOO
B010204
BOlOlOO

B010204
BOlOlOO
B010204
B130000
BOlOlOO

B020000
B130000

BOlOlOO
B020000

BOlOlOO
BOlOlOO

MICROCIRCUIT ,LI :DUAL COMPARATOR

MICROCIRCUIT
MICROCIRCUIT,LI:OPERATIONAL
MICROCIRCUIT,LI:OPERP.TIONAL

MICROCIRCUIT,LI:OPEpATIONAL

MICROCIRCUIT,LI:OPERATIONAL

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

I

LI :OPERATIONAL

DEVICE:ZENERI0.4W,15V,5%

DEVICE:ZENERIO.4W,14.5V,5%,SEL

DEVICE:ZENERISI18.2V12%I0.4W

DEVICE:ZENERI0.4W,9.1V,5%

DEVICE:ZENERI0.4W,9.1V,5%

Mfr

Code MfrPartNumber

AMPLIFIER
AMPLIFIER
AMPLIFIER

AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER

AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER

AMPLIFIER
AMPLIFIER
AMPLIFIER
AMPLIFIER

AMPLIFIER

AMPLIFIER
AMPLIFIER

SEMICOND
SEMICOND
SEMICOND
SEMICOND
SEMICOND

SEMICOND

DEVICE:ZENER,0.4W16.2V,5%

DEVICE:ZENERI0.4W,12V,5%

DEVICE:ZENER,0.4W,15V15%

DEVICE:ZENER,SI,8.2VI2%,0.4W
DEVICE:ZENERI0.4W,10V,5%

DEVICE:ZENERI0.4W,6.2V,!%

REV.

J

JULY 1978

Section

8-FG

501

DIAGRAMS

Symbols

and

Reference Designators

AND CIRCUIT

BOA

Electrical components shown on the diagrams are in the following units unless noted otherwise:

Values one or greater are in picofarads (pF).

Capacitors

=

Values less than one are in microfarads (pF).

=

Ohms

Resistors

(a).

Graphic symbols and class designation letters are based on ANSI Standard Y32.2-1975.

Logic symbology is based on ANSI Y32.14-1973 in terms of positive logic. Logic symbols depict the logic

function performed and may differ from the manufacturer's data.

it

The overline on a signal name indicates that the signal performs its intended function when

1

.I

-1

Abbreviations are based on ANSI Y

972.

goes to the low state.

Other ANSI standards that are used in the preparation of diagrams by Tektronix, Inc. are:

Y 14.1

5,

1966

Y

14.2, 1973

Y10.5,1968

Drafting Practices.
Line Conventions and Lettering.
Letter Symbols for Quantities Used in Electrical Science and
Electrical Engineering.

The following prefix letters are used as reference designators to identify components or assemblies on the diagrams.

Assembly, separable or repairable

(circuit board, etc)
Attenuator, fixed or variable
Motor
Battery
Capacitor, fixed or variable
Circuit breaker
Diode, signal or rectifier

Delay line

Indicating device (lamp)
Spark Gap, Ferrite bead

Fuse
Filter

~llowing special symbols may appear on the diagrams:

The fc

Heat dissipating device (heat sink,
heat radiator, etc)
Heater
Hybrid circuit
Connector, stationary portion

Relay
Inductor, fixed or variable

Meter
Connector, movable portion
Transistor or silicon-controlled

rectifier

Resistor, fixed or variable
Thermistor

Switch or contactor
Transformer
Thermocouple
Test point
Assembly, inseparable or non-repairable

(integrated circuit,
Electron tube
Voltage regulator (zener diode, etc.)
Wirestrap or cable
Crystal
Phase shifter

etc.)

Plug to E.C. Board

[El

Identifies Panel

Controls, Connectors and

Cam Switch

SEL Value Selected

Internal

Functional

Block

Assembly Number

Board

Name

Modified Component-See
Parts List (Depicted in grey,
or with grey outline)

Refer to Waveform

Refer to Diagram Number

Coaxial Connector

Decoupled or Filtered

Etched Circuit Board

Outlined in Black

GRID

LOCATION

(SN

6020000-BELOW)

CHART

CKT GRlC
NO LOC

CKT GRIt
NO LOC

CR230 12
CR240 L3
CR242 L4
CR245 K3
CR246 K3
CR247 K3
CR248 K3
CR285 L6
CR290 L6

CR400 B1
CR450 D6
CR490 C5

:KT GRll
UO LOC

R34
R37
R38
R39
R41
R42
R44
R45
R46
R51
R52
R53
R54
R55
R56
R57
R58

WS9

R60
R61
R62
R63
R64
R65
R66
R67
R68
R69
R70
R72
R73
R80
R81
R82*t
R85
R87
R88
R89
R94
R95
R96
R99
RlOO
R102
R105
R120
R121
R125
R127
R129
R130
R132
R135
R137
R139
R141
R143
R145
R150
Rl5l
R152
R153
R155
R156
R157

CKT GRll
NO LOC

CKT GRIt

NO LOC

R294 M5
R295 M5
R296 L5
R297 K5
R299 J5
R400 62
R403 A2
R405 C2
R406 C2
I3410 E2
R411 C2
R412 D2
R415 D2
R417 E2
R420 84
R422 A4
R424 B4

R43Q

R431 C3
R434 C4
R441 A5
R442 A5
R445
R446 B5
R450 D5
R452 C6
R455 D5
R461 63
R464 63
R465 A3
R468 C4
R471 64
R473 A4

R475 B4

R481 D5
R482 D5

R485 C5

R486 C5

R487 04
R493 A5
R495 L1

S50t 54
S250

U15 M1
U30 L3
U40 E4
U45 F4
U48 E4
U80 F5
U195 G5
U235 L3
U410 C2
U420 B4
U430 C3
U440 65
U460 B3
U470 B4
U480 C5

C3

65

03

:KT GRlC
UO LOC

VR80 G4
VR85 G4
VR150 G2
VR170 E2
VR195 H5
VR205
VR218 L2
VR225
VR237 M3
VR405 B2

E5

52

COMPONENT LOCATION

Below

SN

B020000

GRID

*

See Parts List for serial number ranges.

t

Lacsted

QR

back

Q?

beard.

PHASE

CLAMP

FG

501

BLOCK

DIAGRAM

+

SUMMING

).

INVERTING
AMPLIFIER

4

-+-

t

-4=

J

+17V

+

CURRENT

SOURCE

CURRENT

SW

-CURRENT
SOURCE

I

1

-

\I

-

PHASE

CLAMP

SWITCH

+

I

L

*

w-

v

-

l-

TIMING CAPS

.L

I

L

-

1

.

S50

MULTIPLIER

SWITCH

A

-

VOLTAGE
FOLLOWER

FREQUENCY VERNIER

kt

SUPPLY

-2-

I

I

-20 V REF
SUPPLY

(+

pq

6,

SUPPLY

SUPPLY SUPPLY

CURRENT

Fl

SUPPLY

1

$q

SUPPLY

(-

CURRENT

I

FUNCTION

SELECTOR

S250

?

I

OFFSET

I

OUTPUT

I

I

COMPONENT

SN

B020000-Up

LOCATION

GRID

--

Is*

1*

REV

G,

JUN

1978

*

See Parts List for serial number ranges.

t

Located on back

'~lternate location.

of

board.

CKT GRlD
NO LOC

-

CKT GRlD
NO LOC

CKT GRlD
NO LOC

GRlD

LOCATION CHART

(SN

CKT GRlD
NO LOC

R150 HI
R151 G1
R152 GI
R153 62
R155 G2
R156 F2
R158 F2
R159 F3
Rl6O E2
R161 F3
R162 E2
R163 E3

R170
R171 El
R172 El
R173 F2
R175 E2
R176 F2
R178
R180 E2
R182
R190 H5
R191 G5
8194 G6
R196 G6
R198 H5
R199 G6
R204 F6
R205 G6
R206 F6
R208 E5
R210 E5
R211 D3
R212 E5
R215 L3
R216 C3
R218 L2
R220 L3
R222 L3
R225 K2
R230 J2
R231 12
R233 L4
R234 L4
R237 M3
R240 L3
R242 L3
R251
R252 J5
R254
R256 J6
R258
R263 M4
R265 K5
R267 J5
R268 K5
R269 J5
R271 J6

R272" J6
R273" K6

R274" K5
R275 J6
R277 K6
R279 K5

B020000-UP)

CKT

GRlD

NO LOC
R281 J5

R282 L5
R284 L5
R285 L5
R286 L5
R290 L5
R291 L5

R294 M5
R295 M5
R296 L5
R297 L5
R299 J5

F1

R400 82
63403 A2
R405 C2
R406 C2
R410 E2
R411 D2

F2

R412 D2
R415 D2

E2

R417 E2
R420 B4
R422 A4
R424 B4
R430 C3
R43d C3
R434 C4
R441 A6
R442 A5
R445 B5
R446 B5
R450
R452 C6
R455 D5
R461
R464 A3
R465 A3
R468 C4
R471 B4

R473 A4
R475 84
R481 D5
R482 D5
R485 D5
R486 C5
R487
R493 A5

14

R495 L1

15

S50t J4

46

S250 03

U15 M1
U30 L3
U40 E4
U45 F4
U48 E4
U80 F5
U195 G5
U235 L4
U410 C2
U420 B4
U430 C3
U440 85

05

83

04

CKT GRID
NO

U460 B3
U470
U480 C5

VR80 G4
VR85 64
VR195 H5
VR205 E5
VR218 L2
VR225 J2
VR237
VR405 C2

LOC

84

M3

Waveform conditions:

FREQUENCY
Variable Cal

MULTIPLIER

PHASE
OFFSET
FUNCTION

AMPL

Hz

dial 10

1

o3

in (off)
in (off)
sinewave

fully

clockwise

+IOU

(REF)

~3%)

I

34.8k

+

ZOV

(REF)

VAI37

%

UPPER

X

.I

SYMMETRY

\

CONNECTION

FjM

BO2QC)OO

RBI

36

lc

v

P/O

A1

MhlN

_I

BOARD

REV

D

,

FEB

-1ov

(REF)

1979

REMOVED

\

-

(RE

20v

FI

b

LEVEL

LOWER

FROM

R105

FROM

Rl4l

FROM

T

FG

501

IIIII

pEKq

SZ50

REV

H,

CCW

I

o-~

10-~

to-'

XI

101

lo1

lo3
lo4

r\.r

MULTIPLIER

550

lo5%l

TIMING

0

TIMING

1431

-

16

J

UL

I978

OUTPUT

AMPLIFIER

AND

SWITCH

DETAILS

@

DEH

I

L

*

+20

VOLTS

<DCPL)

+I.."

r

+

11.5

COMMON

I

@

+

11.5

VOLTS

V

TPZ

R4b4

4.0k

+5v

a474

R44,"5

1

1

t

-

C

cl

+5

-

-20

4

17

VOLTS

TVLI

VOLTS

VOLTS

a

(DCPL)

\43\

-

\7

POWER

SUPPLY

@

DEH

273

REPLACEABLE

Section

9-FG

501

ECHANICAL

PARTS ORDERING INFORMATION

Replacement parts are available from or through your local

Tektronix, Inc. Field Office or representative.

Changes to Tektronix instruments are sometimes made to
accommodate improved components as they become available,
and to give you the benefit of the latest circuit improvements
developed in our engineering department. It is therefore

important, when ordering parts, to include the following
information in your order: Part number, instrument type or
number, serial number, and modification number if applicable.

If a part you have ordered has been replaced with a new or

improved part, your local Tektronix, Inc. Field Office or
representative will contact you concerning any change in part

number.

Change information, if any, is located at the rear of this
manual.

SPECIAL NOTES AND SYMBOLS

XOOO

OOX

Part first added at this serial number

Part removed after this serial number

PARTS

INDENTATION SYSTEM

This mechanical parts list is indented to indicate item
relationships. Following is an example of the indentation system
used in the description column.

Name

&

Description

Assembly andlor Component

Attaching parts for Assembly andlor Component

Detail Part of Assembly and/or Component
Attaching parts for Detail Part

Parts of Detail Part

Attaching parts for Parts of Detail Part

Attaching Parts always appear in the same indentation as

the item it mounts, while the detail parts are indented to the right.

Indented items are part of, and included with, the next higher
indentation. The separation symbol

attaching parts.

Attaching parts must be purchased separately, unless otherwise
specified.

*

---

---

---

---

---*---

-

- - * - - -

indicates the end of

FIGURE AND INDEX NUMBERS

Items in this section are referenced

numbers to the illustrations.

INCH
NUMBER SIZE
ACTUATOR
ADAPTER
ALIGNMENT
ALUMINUM
ASSEMBLED
ASSEMBLY
ATTENUATOR
AMERICAN WlRE GAGE
BOARD
BRACKET
BRASS
BRONZE
BUSHING
CABINET
CAPACITOR

CERAMIC
CHASSIS
CIRCUIT
COMPOSITION
CONNECTOR
COVER
COUPLING
CATHODE RAY TUBE
DEGREE
DRAWER

'

#

ACTR
ADPTR
ALIGN

A L

ASSEM
ASSY
ATTEN

AWG

BD
BRKT

BRS
BRZ
BSHG
CAB
CAP
CER
CHAS
CKT
COMP
CONN

cov

CPLG
CRT
DEG
DWR

ELCTRN
ELEC
ELCTLT
ELEM
EPL
EQPT
EXT
FIL
FLEX
FLH
FLTR
FR
FSTNR
FT
FXD
GSKT
HDL

HEX
HEX HD
HEX SOC
HLCPS
HLEXT
HV
I C
ID
IDENT
IMPLR

by figure and index

ABBREVIATIONS

ELECTRON
ELECTRICAL
ELECTROLYTIC
ELEMENT

ELECTRICAL PARTS
EQUIPMENT
EXTERNAL

FlLLlSTER HEAD

FLEXIBLE
FLAT HEAD
FILTER

or

FRAME
FASTENER
FOOT
FIXED
GASKET
HANDLE
HEXAGON
HEXAGONAL HEAD
HEXAGONAL SOCKET
HELICAL COMPRESSION
HELICAL EXTENSION
HIGH VOLTAGE
INTEGRATED CIRCUIT
INSIDE DIAMETER
IDENTIFICATION
IMPELLER

FRONT

LIST

ITEM NAME

In the Parts List, an ltem Name is separated from the
description by a colon
Name may sometimes appear as incomplete. For further ltem
Name identification, the
can be utilized where possible.

IN
INCAND
INSUL
INTL
LPHLDR
MACH
MECH

MTG

NIP

NON WlRE
OBD
OD
OVH

PH BRZ

PL

PLSTC

PN

PNH

PWR

RCPT

RES

RGD

RLF

RTNR

SCH

SCOPE

SCR

INCH
INCANDESCENT
INSULATOR
INTERNAL
LAMPHOLDER
MACHINE
MECHANICAL
MOUNTING
NIPPLE
NOT WlRE WOUND
ORDER BY DESCRIPTION
OUTSIDE DIAMETER
OVAL HEAD
PHOSPHOR BRONZE
PLAIN
PLASTIC
PART NUMBER
PAN HEAD
POWER
RECEPTACLE
RESISTOR
RIGID
RELIEF
RETAINER
SOCKET HEAD
OSCILLOSCOPE
SCREW

or

PLATE

(:).

Because of space limitations, an ltem

US.

Federal Cataloging Handbook

SE
SECT SECTION
SEMICOND SEMICONDUCTOR

SHLD SHIELD
SHLDR SHOULDERED
SKT SOCKET

SL SLIDE

SLFLKG SELF-LOCKING

SLVG

SPR SPRING

SQ SQUARE

SST STAINLESS STEEL

STL STEEL

SW SWITCH

T

TERM TERMINAL

THD THREAD

THK THICK

TNSN TENSION
TPG TAPPING
TRH TRUSS HEAD
V VOLTAGE

VAR VARIABLE
W/ WITH
WSHR WASHER
XFMR TRANSFORMER
XSTR TRANSISTOR

SINGLE END

SLEEVING

TUBE

H6-1

REV.

I

JULY

1978

Replaceable

Mechanical

Parts-FG

501

CROSS INDEX-MFR. CODE NUMBER TO MANUFACTURER

Mfr. Code Manufacturer Address City, State,

AMP,

INC.
TEXAS INSTRUMENTS, INC., SEMICONDUCTOR
GROUP

TRI-ORDINATE CORPORATION

SPECTRA-STRIP CORP.
JACKSON BROS., LONDON,
ALBANY PRODUCTS CO., DIV. OF PNEUMO
DYNAMICS CORPORATION

SPECIALTY CONNECTOR CO., INC.
USM CORP., PARKER-KALON FASTENER DIV.

GETTIG ENG. AND MFG. COMPANY
FISCHER SPECIAL MFG. CO.

HOLO-KROME CO.
BUNKER-RAM0 CORP., THE AMPHENOL

PHEOLL MANUFACTURING CO., DIVISION

OF ALLIED PRODUCTS CORP.

ILLINOIS TOOL WORKS, INC.
SHAKEPROOF DIVISION
STEWART STAMPING CORP.
WALDES

,

WROUGHT WASHER MFG. CO.
TEKTRONIX, INC.
CENTRAL SCW CO.
KINGS ELECTRONICS CO., INC.

CAMCAR

INTERNATIONAL ELECTRONIC RESEARCH CORP.

KOHINOOR , INC

SCREW

AND

LTD.

.

MFG. CO.

RF

DIV.

P

0

BOX

3608

P 0 BOX
EXPRESSWAY

343

7100

145
3560

PO BOX

446
31
33

5700

ST. CHARLES ROAD

630
47-16
2100

P

2530
40
600

135

5012, 13500

SNYDER AVENUE

LAMPSON AVE.

WOODWARD AVENUE

MADISON AVE.

85,

MORGAN ST.
BROOK ST. WEST
E. FRANKLIN ST.

CENTRAL PARK AVE.

0

BOX

MARBLEDALE ROAD

W. MAGNOLIA BLVD.

OFF ROUTE

W. ROOSEVELT RD.

AUSTEL PLACE

S. 0 BAY ST.

500

CRESCENT DR.

18TH AVE.

N CENTRAL

45

HARRISBURG, PA

DALLAS, TX

BE-LEY HEIGHTS, NJ

GARDEN GROVE, CA
CROYDEN , SURREY, ENGLAND

SOUTH NORWALK, CT
INDIANAPOLIS, IN
CAMPBELLSVILLE,
SPRING MILLS, PA
CINCINNATI, OH
HARTFORD, CT
DANBURY, CT

CHICAGO, IL

ELGIN, IL
YONKERS, NY
LONG ISLAND CITY, NY
MILWAUKEE, WI
BEAVERTON, OR
BROADVIEW, IL
TUCKAHOE,
ROCKFORD, IL
BURBANK,

75222

06810

60650

60120

10704

NY

CA

91502

Zip

17105

46227

KY

16875

45206

06110

53207

97077

60153

10707

61101

07922

92642

06586

42718

REV. H JULY

1978

Fig.

Replaceable Mechanical

&

Parts-FG

501

Index Tektronix SerialIModel No. Mfr

--

No. Part No.

Eff

BOlOlOO B019999
B020000

XB020000

BOlOlOO B139209
B139210

BOlOlOO B139209
B139210

BOlOlOO B059999
B060000 B139209
B139210
B060000 B139209
B139210

BOlOlOO B139209
B139210

BOlOlOO B089999
B09000O B139209
B139210
B139210

BOlOlOO B139209
B139210
BOlOlOO B099999
BOlOOOO
BOlOlOO B103149
B103150 B125502
B125503

Ei010100 B109999
BllOOOO B139209
B139210
BOlOlOO B019999
B020000

Dscont

Qty

1 2 3

4

5

SHLD,ELECTRICAL:SIDE

:

KNOB
KNOB : LATCH

.

PIN,KNOB SECRG:0.094 OD X 0.120 INCH LONG

:

RED--CAL

KNOB

KNOB:GY,CAL/W/ARROW,O.127

.

SETSCREW:5-40 X 0.125 INCHIHEX SOC STL
KNOB:GRAY,4 SIDED
KNOB:GRAY,0.25 ID X 0.706 OD10.6H

.

SETSCREW:5-40 X 0.125 INCH,HEX SOC STL
KNOB :GRAY
KNOB :GRAY
KNOB:GRAY,0.127 ID,0.392 OD,0.466

:

GRAY--PULL

KNOB

:

GRAY--PULL

MOB

.

SETSCREW:5-40 X 0.125 INCHIHEX SOC STL
KNOB

:

GRAY

.

SETSCREW:3-48 X 0.095 INCHIHEX SOC STL
KNOB

:

GRAY

KNOB:GRAY,0.127 ID,0.5 OD10.531H

.

SETSCREW:5-40 X 0.125 INCHIHEX SOC STL

:

GRAY

KNOB

:

GRAY

KNOB
KNOB :GRAY
CAP, INSERT, KNOB

.

SETSCREW:5-40 X 0.125 INCHIHEX SOC STL
RING,KNOB SKIRT:
RING,KNOB SKIRT :CLEAR, 1 TO 10
SCREW,MACHINE:2-56 X 0.25"82 DEG,FLH STL
SCREW,MACHINE:2-56 X 0.28lW82 DEG,FLH STL
CONNECTOR,RCPT,:BNC W/HARDWAFE
CONNECTOR,RCPT,:BNC W/HARDWARE
CONNECTOR,RCPT,:BNC

NUT,PLAIN,HEX.:0.5-28 X 0.562 INCH HEX,BRS
WASHER,LOCK:INT,0.521 ID X 0.625 INCH OD

CONNECTORIRCPTI :BNC,FEMALE,W/HARDWARE

CONNECTOR,RCPT,:FEEDTHRU

RESISTOR,VAR:(SEE R206A

NUTIPLAINIHEX.:0.25-32 X 0.312 INCHIBRS
WASHER,FLAT:0.25 ID
RESISTOR,VAR:(SEE R235

NUTIPLAINIHEX.:0.25-32 X 0.312 INCHIBRS

WASHER,FLAT:0.25 ID X 0.375 INCH OD,STL

BUSHING,SLEEVE:PRESS MOUNT
PANEL, FRONT
PANEL, FRONT
PANEL,FRONT:
LCH,PL-IN RTNG:PLASTIC
LCH,PLUG-IN RET:

SCR,TPG,THD CTG:2-32 X 0.250,100 DEGIFLH

BASE,LAMPHOLDER:O.29 OD X 0.19 CASE
LENS,EIGHT:GREEN
LAMPHOLDER :WHITE PLASTIC

:

:

Name & Description Code Mfr Part Number

ID,0.392 OD

:

(ATTACHING PARTS)

,--*---

AND

(ATTACHING PARTS)

X

(ATTACHING PARTS)

R206B EPL)

0.375 INCH OD,STL

AND

R245 EPL)

---*---

(ATTACHING PARTS)

-,-*,--

337-1399-00
366-1422-00
366-1422-01
214-1840-00
366-1031-03
366-1031-08
OBD
366-1170-01
366-1170-03
OBD
366-1023-01
366-1023-01
366-1023-07
366-1023-03
366-1023-08

OBD

366-1319-00

OBD

366-1077-00
366-1077-01

OBD

366-1004-00
366-1007-01
366-1007-05

200-0844-01
OBD
354-0347-01
354-0557-02
OBD
OBD
28 JR168-1
28JR270-1
KC79-67

OBD
OBD

2x20224-402

OBD

2x20224-402

OBD

OBD

REV.

E

JULY 1978

Replaceable Mechanical

Fig.

&

parts-FG

Index Tektronix SerialIModel No.
No. Part No. Eff

213-0088-00 BOlOlOO B010203
213-0044-00 B010204 B099999
213-0138-00 BOlOOOO

210-0201-00

358-0481-00
386-2372-00 BOlOlOO
386-2372-01 BllOOOO

337-1713-00 BOlOlOO B109999
337-1713-01 BllOOOO

376-0051-00 BOlOlOO B089999

376-0051-01 B090000
376-0049-00
354-0251-00
213-0022-00 BOlOlOO B089999
213-0178-00 B090000
384-0209-00
384-0406-00

Dscont Qtv

B109999

501

1 2 3

4

5

ASSY,SP RDCN:

GR

SCR,TPG,THD CTG:4-24 X 0.25 INCH,PNH STL
SCRfTPGfTHD FOR:5-32 X 0.188 INCHfPNH STL
SCR,TPG,THD FOR:4-40 X 0.188 INCH,PNH STL
TERMINAL,LUG:SE #4

BUSHING,SLEEVE:SPLITf0.128

SUBPANEL
SUBPANEL, FRONT

SCRfTPGfTHD FOR:6-20 X0.375"100 DEGfFLH STL

SHIELD,ELEC:SUBPANEL,FRONT
SHIELD,ELEC:SUBPANEL,FRONT

CPLG,SHAFT,FLEX:FOR 0.125 INCH DIA SHAFTS
CPLG,SHAFT,FLEX:FOR 0.125 INCH DIA SHAFTS

.

.

.

.

EXTENSION SHAFT:0.125 OD X 6.064 INCH LONG
EXTENSION
CKT BOARD ASSY :SECONDARY (SEE A2 EPL)

.

.

.

SCREW,MACHINE:4-40 X 0.25 INCH,PNH STL
SCREW,MACHINE:4-40 X 0.25 INCH,PNH STL
POST,ELEC-MECH:0.875 INCH LONG

CKT BOARD ASSY :MAIN (SEE A1 EPL)

,

FRONT

CPLG,SHAFT,FLEX:PLASTIC
RING,COUPLING:0.251 ID X 0.375 INCH OD,AL
SETSCREW:4-40 X 0.188 INCH,HEX SOC STL
SETSCREW:4-40 X 0.125 INCH,HEX,SOC STL

SHAFT:0.125 OD X 5.937 INCH LONG

CONTACT,ELEC:CKT BD SWISPR

ACTR ASSY ,CAM S : (S25O)

COVER,CAM SW:
RING,RETAINING:FOR 0.25 INCH SHAFT
BEARING, CAM SW :FRONT
SPRING,FLAT:CAM SW DETENTt0.006 INCH THK
SPRING,FLAT:CAM SW DETENT,0.008 INCH THK
SPRING,FLAT:CAM SW DETENTtO.O1O INCH THICK
ROLLER,DETENT:0.125 DIA X 0.125 INCH L
ACTUATOR,CAM SW:
BEARING,CAM SW:REAR
NUT,PLAIN,HEX.:4-40 X 0.188 INCH,BRS
CONTACT,ELEC:GROUND

SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

LINK,TERM.CONNE:0.086 DIA X 2.375 INCH L
CONTACT,ELEC:CKT BD SW,SPR
CONNECTOR BODY,:CKT BD MT,3 PRONG
SHIELD,ELEC:CAM SWITCH

SCREWfMACHINE:2-56 X 0.25 INCH,PNH STL
WASHER,FLAT:0.09 ID X 0.188" OD,BRS
INSULATOR,PLATE:2.45 INCH LONG

RESISTOR,VAR:(SEE R27 EPL)

NUT,PLAIN,HEX. ~0.25-32

WASHER,LOCK:INTL,0.26 ID

BRKT,RES.MTG:

SCREW,MACHINE:4-40 X 0.25 INCH,PNH STL

WASHER,MICA:0.50

Name & Description

(ATTACHING PARTS)

---*,--

:
:

(ATTACHING PARTS)

ID X 0.25 INCH OD

---*---

(ATTACHING

PARTS

FOR

ACTR

ASSY)

---*---

(ATTACHING PARTS FOR CKT BD ASSY)

---*-,-

(ATTACHING PARTS)

---*---

(ATTACHING PARTS)

X

0.312 INCHfBRS
X

0.40" OD,STL

---*---

X

0.141 X0.005 INCH THK

Mfr
Code Mfr Part Number

OBD
OBD
OBD

2104-04-00-2520N

OBD

337-1713-00
337-1713-01

376-0051-00
376-0051-01
376-0049-00
354-0251-00
OBD
OBD
384-0209-00
384-0406-00

OBD

83385 OBD
12360 OBD
80009 129-0080-00

83385 OBD
12360 OBD

80009 342-0167-00

83385 OBD
80009 210-0921-00

-

\

IReplace only with part bearing the same color code

as

the original part in your instrument.

REV.

C

JULY 1978

Fig.

&

Index

No.

Tektronix

Part

No.

SerialIModel

Eff

No.

Dscont

Replaceable Mechanical Parts-FG 501

Qty

1 2 3

4

5

.

NUT,PLAIN,HEX.:4-40 X 0.188 INCH,BRS

.

ACTR ASSY ,CAM S : (S50)

COVER,CAM SW:

RING,RETAINING:FOR 0.25 INCH SHAFT

BEARING,CAM SW:FRONT

SPRING,FLAT:CAM SW DETENT,O.O06 INCH THK
SPRING,FLAT:CAM SW DETENT,0.008 INCH THK
SPRING,FLAT:CAM SW DETENT,0.010 INCH THICK

ROLLER,DETENT:0.125 DIA X 0.125 INCH L
ACTUATOR,CAM SW:
BEARING,CAM SW:REAR
NUT,PLAIN,HEX.:4-40 X 0.188 INCH,BRS
CONTACT,ELEC:GROUND

.

SCR,ASSEM WSHR:4-40 X 0.312 INCH,PNH BRS

.

TERMINAL,LUG:NON LOCKING,0.257" MTG HOLE

.

HEAT SINK,XSTR:0.312 DIA X 0.75 L

.

HEAT

.

HEAT SINK,XSTR:(2) TO -202,AL

SCREW,MACHINE:3-48 X 0.125,PNH,STLrCD PL PO2

INSULATOR,PLATE:TRANSISTOR

.

SCR,TPG,THD FOR:6-20

WASHER,FLAT:0.141 ID X .04THK,AL,.21 9 OD
SUPPORT,PLUG-IN:
FR SECT,PLUG-1N:BOTTOM
FR SECT, PLUG-IN :TOP
WIm,ELECTRICAL:2 WIRE RIBBON,O.531 FT LONG
WIRE,ELECTRICAL:5 WIRE RIBBON,0.334 FT LONG
WIRE,ELECTRICAL:6 WIRE RIBBON,0.334 FT LONG
EYELET,METALLIC:0.152 OD X 0.245 INCH L,BRS
EYELET,METALLIC:0.126 OD X 0.23 INCH L,BRS
RESISTOR,VAR:(SEE R25 EPL)
SPRING, GROUND :FLAT

SINK,

TERM.,TEST PT:0.40 INCH LONG

SOCaT,PIN TERM:0.145 INCH LONG

Name & Description

(ATTACHING PARTS FOR ACTR ASSY)

---*---

ELEC:0.25

(ATTACHING PARTS)

ID

X

0.75

INCH LONG

---*---

(ATTACHING PARTS FOR CKT BD ASSY)

X

---*---

0.313 INCH,PNH STL

Mfr

Code

83385 OBD
78584 OBD

Mfr

OBD

210-1270-00
386-3657-00
426-0724-00
426-0725-00
OBD
SS-0526-71061OC
SS-0626-71061OC
210-0774-00
210-0775-00

Part

Number

-

FG

501

FUNCTION GENERATOR

ACCESSORIES

Fig.

&

Index Tektronix SeriallModel No. Mfr

Qt~

I

2

3

4

No. Part No. Eff Dsconf

2- 1 012-0127-00 1 CABLE ASSY,RF:18.50 INCHES LONG

070-1431-01 1 MANUAL,TECH:INSTRUCTION 80009 070-1431-01

5

Name & Description Code Mfr Part Number

80009 012-0127-00

REV.

C

JUN

1978

FG

501

FUNCTION GENERATOR

MANUAL CHANGE INFORMATION

At Tektronix, we continually strive to keep up with latest electronic developments

by adding circuit and component improvements to our instruments as soon as they

are developed and tested.

Sometimes, due to printing and shipping requirements, we can't get these
changes immediately into printed manuals. Hence, your manual may contain new
change information on following pages.

A single change may affect several sections. Since the change information sheets
are carried in the manual until all changes are permanently entered, some
duplication may occur. If no such change pages appear following this page, your
manual is correct as printed.

SERVICE NOTE

Because of the universal parts procurement problem, some electrical parts in your
instrument may be different from those described in the Replaceable Electrical Parts
List. The parts used will in no way alter or compromise the performance or reliability
of this instrument. They are installed when necessary to ensure prompt delivery to
the customer. Order replacement parts from the Replaceable Electrical Parts List.

CALIBRATION TEST EQUIPMENT REPLACEMENT

Calibration Test Equipment Chart

This chart compares TM
characteristics where significant specification differences occur, are listed. In some cases the new instrument

a

may not be

total functional replacement. Additional support instrumentation may be needed or a change in

calibration procedure may be necessary.

DM 501 replaces 7D13

PG 501 replaces 107

PG 502 replaces 107

PG 508 replaces 1 14

PG 506 replaces 106

SG 503 replaces 190,

190A, 190B

500

product performance to that of older Tektronix equipment. Only those

Comparison of Main Characteristics

-

Risetime less than

PG 501
PG 501 - 5 V output pulse;

PG 502

better than equipment being replaced.

PG 506

PG 506

-

Risetime less than

3.5 ns into 50

3.5 ns Risetime

-

5 V output

-

PG 502

Performance of replacement equipment is the same or

SG 503 - Amplitude range

Risetime less than
1 ns; 10 ns
Pretrigger pulse
delay

-

Positive-going

trigger output sig-

nal at least 1 V;
High Amplitude out­put, 60 V.

-

Does not have
chopped feature.

5

mV to 5.5 V p-p.

R.

107

3.0 ns into 50

108 - 10 V output pulse

1 ns Risetime

-

10 V output

108

-

Risetime 0.5 ns; 30

11 1

to 250 ns

Pretrigger pulse
delay

-

Positive and Negative-

106

going trigger output
signal, 50 ns and 1 V;

High Amplitude output,

v.

100

0502-01 - Comparator output

can be alternately
chopped to a refer­ence voltage.

-

Amplitude range 40 mV

190B

to 10 V p-p.

R.

TG 501 replaces 180,

NOTE:

REV B, JUN 1978

All

TM 500 generator outputs are short-proof.

SG 504 replaces

067-0532-01

067-0650-00

SG 503

SG 504

TG 501

TG 501

TG 501

-

Frequency range

250 kHz to 250 MHz.

-

Frequency range
245 MHz to 1050 MHz.

-

Trigger output­slaved to marker
output from 5 sec
through 100 ns. One
time-mark can be
generated at a time.

-

Trigger output­slaved to market

output from 5 sec
through 100 ns. One
time-mark can be

generated at a time.

-

Trigger output­slaved to marker
output from 5 sec
through 100 ns.
One time-mark can

be generated at
a time.

All

TM 500 plug-in instruments require TM 500-Series Power Module.

0532-01

0532-01

180A

181
184

2901

-

Frequency range

65 MHz to 500 MHz.

-

Frequency range

65 MHz to 500 MHz.

-

Trigger pulses 1, 10,
100 Hz; 1, 10, and
100 kHz. Multiple
time-marks can be
generated simultan­eously.

-

Multiple time-marks

-

Separate trigger
pulses of 1 and 0.1
sec; 10, 1, and 0.1
ms; 10 and 1 ps.

-

Separate trigger

pulses, from 5 sec
to 0.1 ps. Multiple
time-marks can be

generated simultan-

eously.

M

Change Reference: C6/479 Date: 4-3-79

M

CHANCE

DIAGRAM

@

I

OUTPUT

SCHEMATIC CORRECTION

AMPL & SWITCH DETAILS-

DESGRlPTION

Partial

Page

CHANGE

Offset

2-2

TO:

Amplitude

Into

Table

50

ohm Load

TEXT CORRECTION

2-1,

Performance Requirement

*

S260

SHOWN

IN