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
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