HP 5304A Operating And Service Manual
OPERATING
AND
SERVICE MANUAL
TIMER/COUNTER
5304A
w.0«
(iOtl
HEWLETT M PACKARD
CERTIFICATION
The
Hewlett-Packard Company certifies that this instrument
was
thoroughly tested
and
inspected
and
found
to
meet
its
published
specifications when
it was
shipped from
the
factory.
The
Hewlett-
Packard Company further certifies that
its
calibration measure-
ments
are
traceable
to the U.S.
National Bureau
of
Standards
to
the
extent allowed
by the
Bureau's calibration facility.
WARRANTY
AND
ASSISTANCE
This Hewlett-Packard product
is
warranted against defects
in
materials
and
workmanship. This warranty applies
for one
year
from
the
date
of
delivery,
or, in the
case
of
certain major
com-
ponents listed
in the
manual,
for the
specified period.
We
will repair
or
replace products which prove
to be
defective
during
the
warranty period provided they
are
returned
to
Hewlett-
Packard.
No
other warranty
is
expressed
or
implied.
We are not
liable
for
consequential damages.
Service contracts
or
customer assistance agreements
are
available
for
Hewlett-Packard products that require maintenance
and
repair
on-site.
For any
assistance, contact your nearest Hewlett-Packard Sales
and
Service Office.
III' M< >1
>EL5;MMA TIMER colINTER
Reeord
of
Revisions (Manual Change I'ages)
REVISION
NUMBER
DATE
ISSUED
DATE
INSERTED
INSERTED
BY
HI'
MODEL :">;{(
M A TIM E R CO
IJNTK
K
Record
of
Revisions (Manual Change Pages)
REVISION
NUMBER
DATE
ISSUED
DATE
INSERTED
INSERTED
BY
I
i
t
I
I
SECTION
IX D
TIMER/COUNTER
5304A
SERIAL PREFIX: 1212A00467
This section applies directly
to HP
Model f>H()lA, Timer
Counters having serial prefix number l2P2A004ti7,
and
must
he
inserted into
the
5300A Measuring System M uiual.
NEWER INSTRUMENTS
This Section with enclosed "Manual Changes Pages"
applies directly
to HP
Model 5.'U)4A Timer Counters having
prefix numbers above 1212A00467.
OLDER INSTRUMENTS
Changes re(|uired
to
back-date this Section
for
older instru-
ments
arc in
Section
IX I),
Subsection
VII.
Copyright HEWLETT-PACKARD COMPANY
1973
5301
STEVENS CREEK BLVD.. SANTA CLARA. CALIF. 95050
Printed:
AUG 1973
HP
PART
NO.
Jjjf
MANUAL 05304-90006 HEWLETT
M,
PACKARD
Model 5304
A
Table
of
Contents
TABLE
OF
CONTENTS
Section i'age
IX I)
5304A Timer/Counter
Subsection
I
GENERAL INFORMATION 91)1-1
91)-1-1. Introduction 9D-1-1
91)-1-2. Description 9D-1-1
91)-1-4. Purpose
and Use of
Section
IX I)
91)-1-1
91)1-6. Instrument Identification 91)1-1
91)1-8. Manual Changes
and
Options 91)1-1
II
INSTALLATION 9D-2-1
9D-2-1. Unpacking
and
Inspection 9D-2-1
9D-2-3. Storage
and
Shipment 9D-2-1
9D-2-5. Installation
and
Removal
of
Plug-On 9D-2-1
9D-2-8. Portable Operation 9D-2-1
III
OPERATION 9D-3-1
9D-3-1. Operating Information
91) 3-1
IV
THEORY
OF
OPERATION 9D-4-1
9D-4-1. Introduction 9D-4-1
9D-4-4. Input Amplifiers 9D-4-1
V
MAINTENANCE 9D-5-1
9D-5-1. Introduction 9D-5-1
9D-5-3. Recommended Test Equipment 9D-5-1
9D-5-5. Instrument Access 9D-5-1
9D-5-7. Periodic Maintenance 9D-5-1
9D-5-9. Maintenance
and
Repair 9D-5-1
9D-5-13. Instrument Troubleshooting 9D-5-1
9D-5-16.
DC
Balance Adjustment 9D-5-3
VI
REPLACEABLE PARTS 9D-6-1
9D-6-1. Introduction 9D-6-1
9I)-o-3. Ordering Information 9D-6-1
VII
MANUAL CHANGES
AND
OPTIONS 9D-7-1
9D-7-1. Manual Changes 9D-7-1
9D-7-3. Newer Instruments 9D-7-1
9D-7-5. Older Instruments 9D-7-1
9D-7-7. Options 9D-7-1
VIII CIRCUIT DIAGRAMS
91) 8-1
9D-8-1. General 9D-8-1
ii
Model 5304A
List
of
Figures
List
of
Tables
LIST
OF
FIGURES
Figure Page
91)1-1. 5304A Timer/Counter 9D-1-0
9D-3-1 Signal Conditioning Using Attenuator, Level
and
Slope Controls 9D-3-1
9D-3-2. Front-Panel Controls
and
Connectors 9D-3-2
9D-3-3. Rear-Panel Connectors 9D-3-4
9D-3-4. Making Self-Check Measurement 9D-3-5
9D-3-5. Making Frequency A Measurements 9D-3-H
9D-3-6. Making Period Average Measurements 9D-3-7
9D-3-7. Making Time Interval Measurements 9D-3-8
9D-3-8. Totalizing 9D-3-10
9D-5-1. Separation Procedure 9D-5-2
9D-5-2. Frequency A Troubleshooting Diagram 9D-5-5
9D-5-3. Period Average A Troubleshooting Diagram 9D-5-7
9D-5-4. Time Interval Troubleshooting Diagram 9D-3-11
9D-5-5. Open/Close Troubleshooting Diagram 9D-5-13
9D-5-6. ('heck Troubleshooting Diagram 9D-5-I5
9D-8-1.
Al
Time Interval Board Assembly,
A2
Attenuator Board Assembly 9D-8-5
LIST
OF
TABLES
1
able Page
9D-1-1. 5304A Timer/Counter Specifications 9D-1-2
9D-5-1. In-Cabinet Performance Checks 9D-5-16
9D-6-1. Replaceable Parts 9D-6-2
9D-6-2. Manufacturers Code List 9D-6-5
9D-8-1. Instrument Interconnection List 9D-8-2
in
Model 5304A
General Information
Figure 91)-1-1. 5304A Timer/Counter
FREQ
A
:»::i :t w
^
XIOO ® PSET^»*»
-
AUTO
ATTEN
xioo
ai oc ^
w
5304A TIMER/COUNTER
OPEN/CLOSE
A
9D-1-0
Model 5.'{(MA
(
ieneral Informatinn
SECTION
IX D
5304A TIMER/COUNTER
SUBSECTION
I
GENERAL INFORMATION
9D-1-1. INTRODUCTION
9D-1-2. Description
9D-1-3.
The
Hewlett-Packard Model 5304A Timer
Counter, when plugged onto
an HP
Model 5300A
Measuring System,
is
capable
of:
Measuring
fre-
quencies
up to 10 MHz,
Time Interval measurements
from
500
nsec
to
10,000 seconds, Period Average
over a range
of 10 Hz to 1 MHz, and
Totalizing.
The
electrical
and
mechanical specifications
are
listed
in
Table 9D-1-1.
9D-1-4. Purpose
and Use of
Section
IX D
9D-1-5. Section
IX I)
contains
the
documentation
necessary
to
operate, maintain,
and
repair
the HP
Model 5304A Timer Counter plug-on. Also included
are
parts lists, component locators,
and
schematics.
This information
is
intended
to be
inserted into
the
5300A Measuring System manual
as
part
of
Section
IX of
that manual.
9D-1-6. INSTRUMENT IDENTIFICATION
91)1 -7.
Hewlett-Packard uses a two-section, nine-
digit serial number (0000A00000) mounted
on the
rear panel
to
identify
the
instrument.
The
first four
digits
are the
serial prefix
and the
last five digits
refer
to the
specific instrument.
If the
serial prefix
on
your instrument differs from that listed
on the
title page
of
this section, there
are
differences
between
the
manual
and
your instrument. Iiower
serial prefixes
are
documented
in
Section
IX I),
Subsection
VII and
higher serial prefixes
are
covered
by a
manual change sheet included with
the
manual.
9D-1-8. Manual Changes
and
Options
9D-1-9.
The
title page lists
the
serial prefix number
to
which this information directly applies.
If the
serial prefix
is
different from
the one
listed,
a
change sheet
is
included describing
the
required
changes.
If
this change sheet
is
missing,
the
infor-
mation
can be
supplied
by any
Hewlett-Packard
Sales
and
Service office listed
in
Section
VI of the
5300A Measuring System Manual. Options
are
listed
in
Section
IX I),
Subsection
VII.
9D I I
Model 5304A
General Information
Table 91)1-1. 5304 A Timer/Counter Specifications
INPUT CHANNELS
A ANI) B
Range:
DC
coupled;
0 to 10 MHz.
AC
coupled;
100 Hz to 10 MHz.
Sensitivity (min):
25 mV rms
sine wave
to I MHz. 50 mV rms
sine wave
to 10
MHz. 150 mV p-p
pulse
at
minimum
pulse width,
40
nsec. Sensitivity
can be
decreased
by 10 or 100
times using
ATTENUATOR switch.
Impedance:
1 Mil
shunted
by
less than
30 pK
Overload Protection:
250 V rms on Xl()
and
XI00 attenuator settings.
On XI
attenuator setting
120 V rms up to 1 kHz,
decreasing
to 10 V rms at 10 MHz.
Trigger Level: PRESET position centers
triggering about 0 volts
±25 mV, or con-
tinuously variable over
the
range
of 1 V to
+
1 V
times attenuator settings.
Slope: Independent selection
of
triggering
on
positive
or
negative slope.
Channel Inputs: Common
or
separate lines.
Gate Output: Rear panel
BNC. TTL low
level while gate
is
open.
May be
used
to
intensity modulate
an HP
oscilloscope.
TIME INTERVAL
Range:
500
nsec
to 10 • sec.
Input: Channels
A and B; can be
common
or
separate
Overload: Maximum recommended levels
for
pulse signals
is 2 V p-p.
Clipping occurs
at 3 V p-p.
Resolution:
100
nsec
to 10 ms in
decade
steps.
Accuracy:
+1
count + time base accuracy
+
trigger error.*
Display:
fjs, ms, or s
(seconds) with positioned
decimal point.
Time Interval Holdoff: Front panel
concentric knob which inserts variable delay
of
approximately
100
/jsec
to 100
msec
be-
tween START (Channel
A) and
enabling
STOP (Channel
B); may be
disabled. Elec-
trical inputs during delay time
are
ignored.
Delay
may be
digitally measured
in
CHECK
position. Delay Output: rear panel
BNC.
TTL low
level during delay time.
May be
used
to
intensity modulate
an HP
oscilloscope.
PERIOD AVERAGE
Range:
10 Hz to 1 MHz.
Input: Channel
A.
Period Averaged:
1 to 10'
automatically
selected
for
maximum resolution.
Frequency Counted:
10 MHz.
Accuracy: +1
count + time base accuracy
+
trigger error.**
Display:
/JS, ms
with positioned decimal point.
FREQUENCY
Range:
0 to 10 MHz.
Input: Channel
A.
Gate Times: Manually selected
0.1, 1, or 10
seconds. AUTO position selects gate time
to
fill display
for
maximum resolution with-
in a
1-second measurement time.
Accuracy:
+1
count + time base accuracy.
Display:
Hz, kHz, and MHz
with positioned
decimal point.
OPEN/CLOSE (Totalizing)
Range:
10 MHz
maximum.
Input: Channel
A
Function: Input signal totalized while gate
open. Opening
and
closing
of
gate initiated
by
front panel pushbutton switch.
GENERAL
Check: Inserts internal
10 MHz
reference
frequency into Channels
A and B.
Time
Interval Holdoff
may be
digitally measured
by
switching
to
CHECK
and
TIME
IN
TERVAL positions.
Operating Temperature:
0° to
50°C.
Power Requirements: Including 5300A
mainframe, nominally
10
watts. Minimum
of 3
hours operation (typically
5 hrs) at 20 C
to
30°C operating
and
charging temperatures.
Weight:
Net, 1 lb (0.9 kg).
Shipping,
314
lbs (1.5 kg).
"For any
waveshape, trigger error
is
less than
±
0.005
Signal Slope
(V/ ps) /js
**Trigger error
is
less than
±0.3% of one
period, i periods averaged
for
signal with
40 dB or
better signal-to-noise ratio.
91)1-2
Model 5304
A
Installation
SECTION
IX D
5304A TIMER/COUNTER
SUBSECTION
II
INSTALLATION
9D-2-1. UNPACKING
AND
INSPECTION
9D-2-2.
If the
shipping carton
is
damaged
ask
that
the
carrier's agent
be
present when
the
instrument
is
unpacked. Inspect
the
instruments
for
damage
such
as
scratches, dents, broken knobs,
etc. If the
instrument
is
damaged
or
fails
to
meet performance
tests when used with
the
5300A Measuring System
notify
the
carrier
and the
nearest Hewlett-Packard
Sales
and
Service office immediately. Performance
check procedures
are
located
in
Section
IX D-5,
and
Sales
and
Service offices
are
listed
in
Section
VI
of the
53(H)A portion
of the
manual. Retain
the
shipping carton
and the
padding material
for the
earner's inspection.
The
Sales
and
Service office
will arrange
for the
repair
or
replacement
of the
instrument without waiting
for the
claim against
the
carrier
to be
settled.
9D-2-3. STORAGE
AND
SHIPMENT
9D-2-4. PACKAGING.
To
protect valuable electronic
equipment during storage
or
shipment always
use
the
best packaging methods available. Your Hewlett-
Packard Sales
and
Service office
can
provide
packaging material such
as
that used
for
original
factory packaging. Contract packaging companies
in
many cities
can
provide dependable customer
packaging
on
short notice. Here
is one
recommended
packaging method:
a. The
original container
is a
corrugated card-
board
box
with
200 lbs.
burst test
(HP No.
9211-1620).
The
instrument
is
secured
and
protected, while
in
the box by a top and
bottom molded form
of
polystyrene foam
(HP No.
9220-1545). Also included
with
the
instrument
is a
plastic dust-protection cover
HP
Part
No.
05300-80004.
9D-2-5. INSTALLATION
ANI)
REMOVAL
OF
PLUG-ON
9I)-2-(>.
The
5304A Timer/Counter must
be
used with
a
mating 5300A Measuring System before
any
measurements
can be
made.
To
mate
the
5304A
Timer/Counter with
the
53(H)A Measuring System,
see
Figure
2-1 and
Paragraph
2-1 of the
5300A portion
of the
manual.
9D-2-7. ENVIRONMENT. Conditions during
storage
and
shipment should
be
normally limited
as
follows:
a.
Maximum altitude: 25,000 feet
b.
Minimum temperature: -40°F ( 40°C).
c.
Maximum temperature: +167"F(+75°C).
9D-2-8. PORTABLE OPERATION
9D-2-9.
The use of the HP
Model
531 OA
Battery
Pack enables
the
5300A Measuring System
and
5304
A
Timer Counter
to be
used
in
areas removed from
ac
power sources.
The 531 OA
Battery Pack provides
a
minimum
of 3
hours operation (typically 5 hours)
at
20°C
to
30°C operating
and
charging temperature.
Tables
1-2 and 1-4 of
5300A portion
of the
manual
list
the HP
5310A Battery Pack
as an
available
accessory. Documentation
on the 531 OA is
also
included
in
Section
IV
through VIII
ol the
5300A
portion
of the
manual.
To
prepare
the
5300A 5304A
for
portable operation, refer
to
Paragraph
2-15 and
Figure
2-2,
steps
a to c of
5300A portion
of
manual.
9D-2-1
OPERATION
(
j
Model 5304A
Operation
SECTION
IX D
5304A TIMER/COUNTER
SUBSECTION
III
OPERATION
9D-3-1. OPERATING INFORMATION
9D-3-2.
The
5300A/5304A Timer/Counter measures
frequencies
up to 10 MHz,
period average
to 1 MHz,
time interval from
500
nsec
to
10,000 seconds;
or
totalizes input signals.
Figure 9D-3-1. Signal Conditioning Using
Attenuator, Level
and
Slope Controls
TRIGGER
VOLTAGE
NOTE
?
RECOVERY
VOLTAGE
+
SLOPE
0
LEVEL
PSET
HYSTERESIS
(NOTE
I)
-
SLOPE
I.
HYSTERESIS (NOISE REJECTION)
VO.
TAGE
IS
CONSTANT
FOR
EACH ATTENUATOR SETTING
AND
DOES
NOT
VARY WITH
TRIGGER LEVEL
2
THIS ALLOWS ZERO VOLTS TRIGGERING WITH GOOD NOISE
REJECTION
3
ATTENUATOR:
xi,
xio.xioo CHANGES TRIGGER LEVEL
AND
HYSTERESIS VOLTAGES
BY
FACTORS
OF
I.IO.IOO
9D-3-3. There
are
four basic signal conditioning
controls used
in
Channel
A or
Channel
B (the
effect
of
these controls
is
shown
in
Figure 9D-3-1).
These
are:
a.
ATTEN switches
for
Channel
A and B.
b.
SLOPE switches
for
Channel
A and B.
c.
LEVEL controls
for
Channel
A and B.
d.
AC-DC switches
for
Channel
A and B.
9D-3-4. ATTEN.
XI, X10,
XI00 switches (both
Channels. Large amplitude signals
can be
attenuated
by
using
the
ATTEN switches. Setting
the
attenuator
switches increases
the
trigger levels
and the
hysteresis voltages
by
factors
of 1, 10, 100. If
input
signal levels
are
unknown,
the
initial measurements
should
be
made with
the
attenuator switches
set
to
XI00.
The
attenuator settings
are
then reduced
until a stable, useable measurement
is
obtained.
9D-3-5. SLOPE Switches (both Channels).
The
slope switches allow
the
selection
of
triggering
on
the
positive
(+) or
negative
(-)
slope
of the
input
signals
(see
Figure 9D-3-1).
9D-3-6. LEVEL Controls (both Channels).
The
level controls allow adjustment
of the
triggering
point
on the
input signal waveform. With
the
LEVEL
controls
set to
PSET
or "0",
triggering
is
centered
about zero volts.
The
voltage range over which
triggering
may be set is -1
volt
to +1
volt times
the
ATTEN switch settings
(±1 V to +100 V).
9D-3-7. AC-DC Switches (both Channels).
The
AC-DC switches select
ac or dc
coupling.
In AC
position
and
PSET, triggering
is
centered about
ac-zero,
and dc
components
on the
signal have
no
effect.
In DC
position
and
PSET, triggering
is
centered about 0 volts
dc on the
signal.
9D-3-1
Model 5304A
Operation
Figure 9D-3-2. Front-Panel Controls
and
Connectors
T.I. A TO B /
FREQ
A
PEP,
10 m« v
AVO/A
\
XlOO
PUT
AYTEN
LEVE
.1 ms
00^ DO
Kg]
5304A TII/ER/COUNTER
OPEN.XCLOSE
A
1.
COM-SEP-CHK. Three position switch
enables selection
of
input signal from
separate
or
common sources
or
enables
the
selection
of a
Self-Check position.
a. COM:
Connects INPUT
A and
INPUT
Bin
parallel.
b. SEP:
Channel
A and
Channel
B
inputs
are
from separate sources.
c. CHK:
Self-Check verifies that
5300A
10 MHz
crystal oscillator
and
counting logic
and the
5304A
gating logic
is
functioning
correctly.
2.
INPUT
A and B.
Input signal frequencies
to be
measured
are
connected
to
INPUT
A.
INPUT
B is
used
in
time interval
measurements.
3.
ATTEN. Three-position input signal
attenuator
for
both channels.
a. XI:
Connects input signals directly
to
input amplifiers.
b. X10:
Attenuates input signals
by
factor
of 10.
c.
XlOO: Attenuates input signals
by
factor
of 100.
9D-3-2
Model 5304A
Operation
Figure 9D-3-2. Front-Panel Controls
and
Connectors (Continued)
4.
AC-DC. Two-position switch allows
selection
of
ac-coupling
or
direct-coupling
to
input amplifiers.
5.
SLOPE
+, -.
Selects
the
triggering
on
positive
or
negative slope
of the
input
signals.
6.
LEVEL. Adjusts
the
input trigger levels.
Preset
to
trigger
at 0
volts.
7.
FUNCTION. Twelve-position switch
enables 4 modes
of
operations
to be
selected.
The
modes
are:
a. T.I. A to B:
Enables time interval
measurements
to be
made from
500
nsec
to
10,000 seconds.
Resolution
is
adjustable from
.1 /JS
to 10 ms in six
decade steps.
b. PER AVG A:
Enables multiple
period averages
to be
made from
8.
Channel A with frequencies
of 10
Hz to 1 MHz.
Periods averaged
are
automatically selected from
1 to 10\
c.
FREQ
A:
Enables frequency
measurements from
0 to 10 MHz
when
dc
coupled
and 100 Hz to
10 MHz
when
ac
coupled.
1)
AUTO: Gate time
is
auto-
matically selected
to
fill
the dis-
play
for
maximum resolution
of
the
signal being measured, without
overflow,
up to a
maximum,
of
1
second.
2) .IS, IS, 10S:
Counter gate time
is
manually selected
for .1
seconu,
1
second
or 10
seconds.
d.
OPEN/CLOSE A (Totalize):
En-
ables input signals
to
Channel
A to
be
totalized. Totalizing
is
initiated
by
pressing OPEN/CLOSE A switch
and
terminated
by
pressing
the
switch a second time.
DELAY. Adjustment inserts a time interval
delay
of 100
/jsec
to 100
msec between
Start (Channel
A)
signal
and
Stop (Chan-
nel B)
signal; when disabled, there
is a
residual delay
of
about 4200 nsec.
9D-3-3
Model 5304A
Operation
Figure 9D-3-3 Rear-Panel Connectors
GATE
OUT
DELAY
OUT
1.
GATE
OUT: A
TTL-LOW level signal
while
the
5300A main gate
is
open.
2.
DELAY
OUT: A
TTL-LOW level signal
during
the
delay time selected
by
front-
panel DELAY control
(in T.I. A to B
mode only).
Model 5304A
Operation
Figure 9D-3-4. Making Self-Check Measurements
NVCLOSE
l(REAR)
/
INPUT
XIO
xioo
I
ATTEN
XI
XIO
XiOC
» DC
mi
5304A TIMER/COUNTER
PSE
SLOPE LEVEL
0
PSET**
I A TO B
FREQ
A
PER
10 ms
I ms
.1 ms
10 ps
I MS
l us
1
Connect
ac
power
to
5300A
ac
receptacle.
2.
Turn
ac
power
"on"
with 5300A SAMPLE
KATE control. Adjust SAMPLE KATE
for
desired display time.
3. Set
5304A
COM
SEP-CHK switch
to CHK.
4. Set
5304A "Function" switch
to
FREQ
A,
AUTO. Display should
he
10.0000
MHz,
+ 1
count.
5. The
time interval hold-off
may be
meas-
ured
by
selecting
on of the T.I. A to B
positions
of the
"Function" switch.
9D-3-5
Model 5304A
Operation
Figure 9D-3-5. Making Frequency A Measurements
XIOO
IMER/
I
(REAR)
/
INPUT
ATTEN
T.I. A TO B
PER
10 ms v AVG '
\ •
t ms —^
.1 ms
10 |iS
I ps
MS
—
OPEN
FREQ
A
AUTO
It
I s
10 8
OSE A
PSET^
SLOPE LEVEL
Q
+
1.
Connect
ac
power
to
5300A
ac
receptacle.
2.
Turn
ac
power
"on"
with 5300A SAMPLE
KATE control
and
adjust sample rate
for
desired display time.
3. Set
COM-SEP-CHK
to SEP.
4.
Connect input signal
to
INPUT A jack.
5. Set
ATTEN
to
XI00; AC-DC
U>
coupling
desired
and
SLOPE
to
polaritv desired.
Set
LEVEL
to
PSET.
(>. Set
"Function"
to
FREQ
A,
AUTO
and
adjust
the
ATTEN switch until a stable
display
is
obtained.
The
gate time
may
be
adjusted
for .Is, Is, or 10 sec.
Model 5304A
Operation
FREQ
A
NPUT
xioo
m DC •
53/4A TIMER/COUN/
Figure 9D-3-6. Making Period Average Measurements
I
(REAR)
1.
Connect
tic
power
to
5300A
ac
receptacle.
2.
Turn
ac
power
"on"
with 5300A SAMPLE
KATE control. Adjust sample rate
for
desired display time.
3. Set
COM-SEP-CHK
to SEP.
4.
Connect input signal
to
INPUT A jack.
5. Set AIT EN to
XI00, AC-DC
to
coupling
desired
and
SLOPE
to
polarity desired.
Set
LEVEL
to
PSET.
(). Set
"Function"
to PER AVG A;
adjust
A'lTEN switch until a stable display
is
obtained.
The
number
of
periods averaged
is
automatically selected.
9D-3-7
Model 5304
\
Operation
l(REAR)
AUTO
Figure 9D-3-7. Making Time Interval Measurements
1.
Connect
ac
power
to
5300A
ac
receptacle.
6.
2.
Turn
ac
power
"on"
with 5300A SAMPLE
RATE control. Adjust sample rate
for
desired display time.
3. Set
"Function" switch
to T.I. A to B,
with desired resolution. Ensure DELAY
control
is
full
ccw.
4. Set
ATTEN switches
for
both channels
to
XI00; AC-DC switches
and
SLOPE controls
switches
to
settings desired;
set
LEVEL
controls
to
PSET.
5. If
Start
and
Stop signals
are
from separate
sources, connect
the
Start signal
to
INPUT
A
connector
and the
Stop signal
to
INPUT
B
connector, then
set the
COM-SEP-CHK
switch
to SEP. If the
Start
and
Stop
signals
are
from a common source, connect
the
signal input
to
INPUT
A and set the
COM-SEP-CHK switch
to COM.
Adjust ATTEN switches until a stable
dis-
play
is
obtained.
Time Interval Holdoff (DELAY).
The
I)p]LAY control inserts a delay
of
about
100
psec
to 100
msec between
the
triggering
of the
START Channel
"A" and the en-
abling
of the
STOP Channel
"B" (see
Figure
B).
This delay
may be
used
to
measure relay
or
other mechanical
switch timing sequences without error
due to
contact bounce.
It may
also
be
used
for
measurements
on
pulse trains;
for
example from
the
start pulse
to a
later
pulse,
in the
presence
of
intervening pulses.
To use the
DELAY, proceed
as
follows:
a. If the
desired delay
is
known,
it
may be set and
measured
by
selecting
T.I. A to B and CHK and
setting DELAY control
to the
desired
delay time.
The
measurement
may
then
be
made
by
switching
COM-
SEP-CHK
in
step
5.
9D-3-8
Model 5304A
Operation
Figure 9D-3-7. Making Time Interval Measurements (Continued)
b. If the
input signals
are
pulse trains,
it is
possible
to
select a pulse
out of
the
train
by
increasing
the
DP]LAY
from full
ccw; the
measured time
interval will increase
in
steps
as the
delay falls after successive pulses
in the
train.
c. For
maximum flexibility
and
ease
of
interpretation,
an
oscilloscope
may be
used
to set up the
measurement
(as
shown
in
Figure
A). The
DELAY
OUTPUT
is
used
to
trigger
(he
time
base
and
intensity modulate
the dis-
play
(see
Figure
A). For a
repetitive
waveform,
the
Channel A input
may
fall during
the
display cycle,
and
therefore might
not
initiate a meas-
urement.
The
GATE output
may be
substituted
for the
DELAY OUTPUT;
this allows intensifying
the
actual
measurement rather than
the
delay.
If the
inputs
are
common,
the
GATE
OUTPUT
or
DELAY OUTPUT
can
be
displayed
on the
second channel
(or a
third channel
of a
four-channel
scope),
and the
other
of
these
two
used
to
intensity modulate.
d. Set
oscilloscope controls
as
follows:
HP 1801 A: Set A and B
Channel
controls
for a
display
of
both input
signal.
Set
DISPI
AY to A+B.
HP
182!A:
Set
TRIGGER
to EXT.
SLOPE
to -.
Coupling
to ACF.
SWEEP MODE
to
NORM.
Time/CM
for one
cycle
of
measured
Time Interval.
e. Set
DELAY slightly
out of
full
ccw
and
selcct
the
time interval delay.
The
SWEEP TIME
may
have
to be
readjusted.
f.
Adjust INTENSITY
to
view only
the
time interval measured.
g.
Oscilloscope time display
and
5300A
time readout should
be the
same.
Figure
B:
Example
of
Delay Control
CH A
INPUT
SIGNAL
CH B
INPUT
SIGNAL
GATE
SIGNAL
DELAY
OUT
SIGNAL
JUL
' I
{
I
' I
.TIME INTERVAL
HOLDOFF DELAY
TIME INTERVAL DELAY SETTING
Figure
A:
Delay Control Setup
1
'DELAY
OUT i
50 OHM
TERMINATIONS
EXT
INPUT
T I
STOP SIGNAL
T. 1.
START SIGNAL
SIGNAL
SOURCE
HPI80A
OSCILLOSCOPE
9! KM)
Model 5304A
Operation
Figure 9D-3-8. Totalizing
OPENXCLOSE OPEN
SAMPLE RATE
GSD
5300A MEASURING SYSTEM
HEWLETT • PACKARD'
l(REAR)
1.
Connect
ac
power
to
5300A
ac
receptacle.
2.
Turn
ac
power
"on"
with 5300A SAMPLE
RATE control. Adjust sample rate
for
desired display time.
3. Set
"Function" switch
to
OPEN ' CLOSE
A.
4. Set
Channel A ATTEN
to X100;
AC-DC
and
SLOPE
to
desired positions.
Set
LEVEL
to
PSET.
5.
Connect signal
to be
totalized
to
INPUT
A; set COM
SEP-CHK
to SEP.
6.
Press RESET; press OPEN/CLOSE
A
switch; C lamp should come
on.
7.
Reduce ATTEN A until counting occurs.
Display will accumulate
at a
rate depend-
ent on
input signal frequency.
8.
When
the
display
has
accumulated
the
desired number
of
counts, press OPEN
CLOSE A switch
to
stop totalizing.
9. If the
operator wants
to
totalize starting
from
the
number accumulated
in the dis-
play, press
the
OPEN/CLOSE A switch.
If a new
totalizing measurement
is to he
made, press RESET before pressing
OPEN CLOSE A switch.
T.I. A TO 8
FREQ
A
PER
10 ms AVG A ,
AUTO
\ ' V
4 *
0
"1 - *
PSET'
SLOPE LEVEL
INPUT
ATTEN
XI00
[Mi
5304* TIMER
9D-3-10
THY
Model 5304A
Theory
of
Operation
SECTION
IX D
5304A TIMER/COUNTER
SUBSECTION
IV
THEORY
OF
OPERATION
9D-4-1. INTRODUCTION
9D-4-2. This subsection describes
the
theory
of
operation
for the
5304A Timer/Counter. Basic oper-
ation
of
gates, certain amplifiers
and
integrated
circuits
is
found
in
Section
IV of the
5300A portion
of the
manual.
9D-4-3.
To
simplify measurement making refer
to
operating information starting with Paragraph 9D-3-1
for
optimum adjustment
of
various controls.
9D-4-4. INPUT AMPLIFIERS
ANI)
MODES
OF
OPERATION
9D-4-5. CHANNEL
A. The
Channel A input signal
is
applied
to
front-panel INPUT A jack
and
attenu-
ated
by A2
attenuator assembly
(XI, X10, X100)
and
sent
to Al
Channel A input amplifier.
The
A2
Attenuator Board Assembly also contains
the
AC-DC switches, SLOPE switches,
and the
LEVEL
controls
for
both channels.
The
input signal
is
sent
through
A2 to the
input
of
matched
FET
source-
follower pair,
Q2 and Q4.
Diodes
CR2, CR4 are
limiters
for Q2
inputs.
9D-4-6.
One
side
of the FET
source-follower pair
(Q2)
receives
the
input signal from A2J2
and the
other side
(Q4) is
connected
to
LEVEL A trigger-
level control A2R9.
Q2 and Q4 are
connected
to
differential amplifier
Q6 and Q8
respectively
and
provides level shifting
and
gain
of
approximately
.3 for
Channel A signals. Resistor
R20 is a dc
balance
for
differential amplifier
Q6 and Q8.
9D-4-7.
The
output from
Q6, Q8
drives another
differential amplifier, U24B.
The
U24B output
is
shaped
by
Schmitt-Trigger U24A
and
level-shifted
(ECL to TTL)
through
U21B, Q12
combination.
The U21B
expander output
is
used
to
obtain
suf-
ficient signal swing
to
drive
Q12.
9D-4-8. CHANNEL
B. The
Channel B input signal
is
applied
to
front-panel INPUT B jack
and
attenu-
ated
by A2
Attenuator Assembly
(Xl, X10,
XI00)
and
sent
to Al
Channel B input amplifier.
The A2
Attenuator assembly also contains
the
Channel
B
coupling switches, slope switches
and the
Channel
B
level control.
The
Channel B signal
is
routed
through
A2 to the
input
of
matched
FET
source-
follower pair
Ql and Q3.
Diodes
CRl, CR3 are
limiters
for Ql
inputs.
9D-4-9.
One
side
of the
Channel
B FET
source-
follower pair
(Ql)
receives
the
input signal from
A2J1 and the
other side
(Q3) is
connected
to
LEVEL
B
trigger level control A2R10.
Q5 and Q7 are con-
nected
to
differential amplifiers
Qf> and Q7 re-
spectively
and
provide level-shifting
and
gain
of
approximately
.3 for
Channel B signals. Resistor
R19 is a dc
balance
for
differential amplifier
Q5
and Q7.
9D-4-10.
The
output from
Q5, Q7
drives another
differential amplifier U23B.
The
U23B output
is
shaped
bv
Schmitt-Trigger U23A
and
level-shifted
(ECL to TTL)
through
U21A, Qll
combination.
The
U21A
expander output
is
used
to
obtain sufficient
signal swing
to
drive
Qll.
9D-4-11. VOLTAGE REGULATION. Transistors
Q9,
Q10
provide regulated, low-ripple
dc
power
to the
amplifiers
and
time interval hold-off circuits.
9D-4-12. SLOPE SELECTION. Slope selection
for
Channel
A is
accomplished
by
using
U19C,
U20C,
and
U20I)
in
conjunction with A2S7. Slope selection
for
Channel
B is
accomplished
by
using U19I),
U20D,
and
U20A
in
conjunction with A2S(>.
9D-4-13. CHECK MODE.
In the
CHECK mode,
the
operation
of the
5300A
10 MHz
crystal oscillator
and
counting logic
and the
5304A gating logic
is
verified. When
A2S1 is in CHK
mode, ground
is
applied
to
U18A(2), U18I)(12),
and
U13C(5).
The
10 MHz
clock from
the
5300A A1J1(16)
is
routed
through
the
5304A AlPl(16)
and
sent
to
U12D(12).
The
Channel A switch (U18B)
and
Channel B switch
(U18C), gate
the 10 MHz
clock signal through.
The
Channel A switch output
is
also gated through
U12B
and U16B and is
available
as the Fl
signal
at
A1P1(5).
9D-4-14. FREQ A MODE.
In the
frequency
measuring mode, with
the
"Function" switch
S2 in
any of its
four frequency measuring positions
(FREQ AUTO,
.IS, IS, 10S) the
Channel A input
signal
is
gated through "Channel A Slope Selection"
switch comprised
of U19C,
U20C,
and
U20B.
The
input signal
is
then routed through another "Channel
A"
switch made
up of U18A and U18B.
From
U18B(6)
the
Channel A input signal
is
gated through
U12B and U16B as the Fl
signal
to the
5300A
mainframe which controls
the
opening
and
closing
of the
main gate.
The 10 MHz
clock signal from
9D-4-1
Model 5304A
Theory
of
Operation
the
5300A mainframe
at A1
Pi(16)
is
routed through
U12C as the F2
signal
to
control
the
time base,
which clocks
the
opening
and
closing
of the
main
gate.
9D-4-15.
The
positive-going edge
of a
negative pulse
from
U17E is the MAX
TIME signal.
The MAX
TIME signal
at A1
Pi(17) triggers a display cycle
in
the
5300A mainframe. This negative-going pulse
can be
generated from
one of two
sources.
One
of the
sources
is the
positive-going edge
of the
MGFF line
at
A1P1(12) which indicates
the
closing
of the
5300A main gate. This signal
is
inverted
through
U17D and
differentiated
l>y CI4 and R69.
CR18 is a
clamping diode
to
shorten
the dif-
ferentiation recovery time.
The
negative pulse
of the
differentiated waveform, gates
U16A "on"
and the
narrow positive-going pulse
is
inverted
through
U17E as the MAX
TIME signal.
9D-4-16.
The
TIME BASE
OUT
signal
at
AlPl(18)
comes from
the
5300A mainframe
and is
buffered
by Q18
then gated through
U14C, U1HA, and
inverted
through
U17E as the MAX
TIME signal.
9D-4-17.
The
positive-going edge
of the
negative
pulse
at
A1PK17), indicates
the
display cycle
has
been triggered.
9D-4-18. PERIOD
AVG A
MODE.
In
period average
mode
the
"function" switch
S2
enables
UlA, U6D,
U12C, and U14A. The
Channel A signal
is
routed
through "Channel A Slope Selection"
and
"Channel
A
Switch"
at
U18B(6).
The
signal
is
then gated
through
U16C and is
available
at
AlPl(21)
as the 1
MHz
TIME BASE.
The
CLOCK signal
at
A1P1(16)
is
gated through
U12A, U16B as the Fl
signal
to
be
counted.
9D4-19. Flip-flop
U4A
prevents very narrow pulses
from triggering
the
time base
but not the
main
gate.
The
first Channel A pulse after
the
INHIBIT
signal goes high
at the end of the
display cycle
"clocks" U4A(5)
to a
high state
and
enables
U16C.
The
next positive-going edge
of the
Channel A signal
is
gated through
U16C as the 1 MHz
TIME BASE
INPUT signal.
The
main gate
is
then closed
by
one of two
events.
The
first event
is: The 9
signal
line from 5300A,
U3
COUNTER, goes
low, and
enables
the
main gate
in the
5300A,
U5
CONTROL,
to
close
on the
next
LOG
pulse. When
the 9
line
goes
low it
indicates that
the
display
is 9%
full.
The
main gate closes
at the end of the
next decade-
multiple
of the
input signal
to
prevent overflow.
The
second event
is: The
TIME BASE
OUT
signal
(A1P1(18)) from
the
5300A,
U4
TIME BASE goes
low
indicating
the I0a periods have been counted.
The
main gate closes because
no
more counts
can
be
stored
in the
5304A exponent counter
U8A and U8B.
The
exponent counter counts
the
number
of
decade-
transitions
of the
input signal that have been
counted
(1, 10, 100, 1000
input transitions
or ex-
ponent counts
of 1, 2, 3, 4).
9D-4-20.
The LOG
OUTPUT signal (generated
by
5300A,
U4
TIME BASE)
is
active
in
Frequency
and
Period Average Modes
and
provides pulses
to
open
and
close
the
main gate. Following a display cycle
and
reset,
the
first
LOG
pulse opens
the
main gate
and a
following
LOG
pulse will close
the
gate only
after
a 9 or MAX
TIME
low
signal enables
the
closing
of the
main gate flip-flop.
9D-4-21. OPEN/CLOSE A MODE.
In
open/close
mode, with
the
"function" switch
S2 in
OPEN/
CLOSE position
the
main gate
is
opened
and
closed
by
successive actuations
of
pushbutton switch
SI.
The
Channel A input signal
is
gated through "Slope
Selection" switch
U19C,
U20B,
and
U20C
to
"Chan-
nel A
Switch"
U18A and U18B.
9D-4-22.
The
Channel A input signal
is
gated
through
U12B, U16B to be
counted.
U4B
"clocks"
on
successive actuations
of the SI
OPEN/CLOSE
switch. When U8B(9) output
is low the
5300A
main gate
is
opened (through U19B). When
U4B(8) output
is low the
5300A main gate
is
closed
(through
U14D and
U22A). When
the
"Function"
switch
S2 is in a
position other than OPEN/CLOSE,
the U4B
Preset
and
Clear lines
(U4B
pins
10 and 13
respectively)
are set
through
U10A and B, so
that
IJ4B,
Q and Q
output
(U4
pins
9 and 8) are
high.
9D-4-23. TIME INTERVAL
A-B
MODE.
In the
time interval mode,
the
"function" switch
S2 may
be set to any one of six
time-interval positions
(.1
/Jsec
to 10
msec).
The
5300A main gate
is
opened
by a
Channel A transition
and
closed
by a
Channel
B
transition. Switch
A2S1
enables
the
input signals
to be
taken from separate sources
or
from
a
common source.
9D-4-24.
The
Channel A signal, after passing
through
A2
Attenuator Assembly,
is
processed
through Channel A amplifier,
Q2 Q4 and
differntial
amplifiers
Q6, Q8, and
U24B.
The
U24B output
is
shaped through U24A Schmitt-Trigger
and
sent
through
an
ECL-to-TTL level-shifter (U21B,
Q21)
to the
Channel A Slope Selection circuits (U19C,
U20C, U20B).
9D-4-25.
The
output from U20B(4)
is
gated through
Channel A switch, comprised
of U18A and B. The
Channel A signal "clocks"
U15B
which
is
gated
through
U9C, U19B, and
opens
the
5300A main gate.
During
the
gate-open time,
the
TIME BASE
OUT
9D-4-2
Model 5304A
Theory
of
Operation
signal from
the
5300A
A1J 1(18) is
gated through
Q18, U17F, U9B, and U16B to be
counted (except
in the .1
fjsec position, where
the 10 MHz
clock
is
gated through
U12A and
U16B).
The
TIME BASE
OUTPUT signal
is a 10 MHz
clock signal divided
down
by the
time base
to
allow counting
in
incre-
ments
of 1
fjsec,
10
fjsec
etc.
9D-4-26.
The
main gate closes when Channel
B
"clocks"
U15A and a
display cycle
is
initiated
by
the
positive-going edge
of the
MGFF signal
at
A1P1(12). This signal
is
inverted through
U17I)
and
differentiated
by C14 and R69. The
negative
pulse
of the
differentiated waveform gates
U16A
"on" and the
narrow positive-going pulse
is
inverted
through
U17E as the MAX
TIME signal.
9D-4-27.
At the end of the
display cycle,
the
RESET signal
at
AlPl(15)
is
inverted through
U13E and
sets U15B(9)
low.
U15A(5)
is set
high
by
the
PRESET signal
at
U15A(4).
The
INHIBIT signal
goes "high"
and
sets U15B(12)
so
that
U15B
changes
states
on the
positive-going transition from U18B(6).
This produces
two
results:
1.
U9C(8) goes
low
which
set the
OPEN signal
at
A1P1(10)
low
through
U19B and
opens
the
5300A main gate.
2. Q16
turns
off and
allows
C12 to
charge
through
R43 and R61.
9D-4-28. Transistor
Q15 is an
emitter-follower
in-
put to
Schmitt-Trigger
Q13, Q14. The
output from
Q13 is
level-shifted
by CR15 and
inverted
by Q17.
Q15, 14, 13, and 17
form a one-shot multivibrator
with a very wide timing range.
U15A
cannot change
states until
Q17
output goes
low;
then U15A(3)
is
clocked
to its
opposite state
by the
positive trans-
ition
of U18C
(Channel B switch output).
The
U15A(5) output
is
gated
and
inverted through
U14I)
and
U22A. This causes
the
CLOSE signal line
to
go low
which
in
turn closes
the
5300A main gate.
9D-4-29.
The
5300A main gate cannot
be
re-opened
until
U15B is
cleared
by the
RESET signal
at
A1PK15)
and
until
the
INHIBIT signal
at
AlPl(8)
sets U15B(12) high. U15B(8) goes high
at
RESET
and
turns
on QI8
which discharges
C12.
When
R43(S2)
is
open (full
ccw), CI2 is not
charged
up and the
one-shot time-interval
is
very short
(about
200
nsec).
The
time-interval
is the
interval
from
the
time U15B(8) goes
low and Q17
collector
goes
low.
9D-4-30. A buffered DELAY
OUT
signal
is
provided
at J3 and may be
used
for
intensifying
the
oscil-
loscope Z axis which permits observing
the
start
and
stop period
in a
time interval measurement.
A
buffered GATE
OUT
signal
is
also provided
at J4
which permits observing
the
gate signal duration
in a
time interval measurement
9D-4-31. EXPONENT COUNTER; EXPONENT
STORAGE. Outputs from
the
5300A,
U5 EXP
line
are
appli<
J to
exponent counter
U8A, U8B
"Clock
input".
The
RESET signal
at A1
Pi(15) clears
USA
and
presets
U8B for
another measurement.
Ex-
ponent signals "clocked" into
U8
indicate length
of
measurements
(10 ms, 100 ms, or 1 sec in
FREQ AUTO mode;
1, 10, 100, 1000
periods
in
PERIOD
AVG
mode). During
the
measurement
cycle, information
is
transferred into
U7A, B
exponent storage
by the
TRANSFER signal. There-
fore,
the
displayed measurement,
the
decimal point
and the
units, change simultaneously.
9D-4-32. Exponent storage
U7A, B is
disabled (both
flip-flops
are
cleared), except
in
AUTO measure-
ments,
by U6I).
Manual reset also clears
U7A, U7B,
the
decimal point
and
measurement units.
9D-4-33.
The
remainder
of the
gates with
the
exception
of U5B
provide time base, decimal point,
annunciator,
and
function decoding.
The U3A out-
put is
high
in any of the
four frequency-measuring
positions.
U5B
locks
out the LOG
OUTPUT signal
in
OPEN CLOSE
A and
TIME INTERVAL
A B,
when
the
open
and
closing
of the
main gate
is con-
trolled
by
OPEN
and
CLOSE.
9D-4-34.
Q19
normally turns
off the 9
line except
during frequency Auto
or
Period Average; this
allows overflow
to
occur,
if
desired,
in
manual
fre-
quency position.
9D-4-3
MAINTENANCE
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