HP 546A Logic Pulser Service manual

OPERATING AND SERVICE MANUAL
LOGIC PULSER
546A
Flio- HEWLETT
PACKARD

HEWLETT-PACKARD SALES AND SERVICE OFFICES
To obtain servicing information and order replacement parts, contact the nearest Hewlett-Packard Sales and
Service Office in
HP Catalog, or contact the nearest regional office.
IN THE UNITED STATES:
CALIFORNIA
3939 Lankershim Blvd.
North Hollywood 91604
GEORGIA
P.O. Box
28234
450 Interstate North
Atlanta 30328
ILLINOIS
5500 Howard Street
Skokie 60076
NEW JERSEY
W. 120 Century Road
Paramus
07652
IN CANADA:
QUEBEC
Hewlett-Packard (Canada) Ltd.
275 Hymus Blvd.
Pointe Claire
IN EUROPE:
SWITZERLAND
Hewlett-Packard (Schweiz) AG
Rue du Bois-du-Lan 7
P.O. Box 85
CH-1217 Meyrin 2Geneva
IN AFRICA, ASIA, AND AUSTRALIA:
Hewlett-Packard Intercontinental
3200 Hillview Ave.
Palo Alto, California
94304
IN CENTRAL AND SOUTH AMERICA:
Hewlett-Packard Intercontinental
3200 Hillview Ave.
Palo Alto, California
94304

CERTIFICATION
Hewlett-Packard Company certifies that this instrument met its published specifications at the time of
shipment from the factory. Hewlett-Packard Company further certifies that its calibration measure-
ments are traceable to the
United States National Bureau of Standards, to the extent allowed by the
Bureau's
calibration facility, and to the calibration facilities of other International Standards Organi-
zation members.
WARRANTY AND ASSISTANCE
This Hewlett-Packard product is warranted against defects in materials and workmanship for aperiod
of one year from the date of shipment. Hewlett-Packard will, at its option, repair or replace products
which prove to be defective during the warranty period provided they are returned to Hewlett-Packard,
and prOVided the preventive maintenance procedures in this manual are followed. Repairs necessitated
by misuse
of the product are not covered by this warranty. NO OTHER WARRANTIES ARE EXPRESSED
OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANT-
ABILITY AND FITNESS FOR A PARTICULAR PURPOSE. HEWLETT-PACKARD IS NOT LIABLE FOR
CONSEQUENTIAL DAMAGES.
Service contracts or customer assistance agreements are available for Hewlett-Packard products.
For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are pro-
vided at the back of this manual.
010000-A-237

CHANGE DATE: May 5, 1983
MANUAL CHANGES
MANUAL DESCRIPTION
This change supersedes all earlier
dated changes.
*** Make all corrections listed
under ERRATA before making
other changes.
********************
* INSTRUMENT: 546A *
*Logic
Pulser Operating and *
* Service Manual *
* *
*** Check
following table for your
instrument's serial prefix,
series number, or date code and
make listed change(s) to manual.
*
*
SERIAL PREFIX:
*
* DATE PRINTED:
* HP PART NO:
* MICROFICHE NO:
*********
1644
MAY 1977
00546-90005
00546-90006
*******
*
*
*
*.
*
*
****
n INDICATES NEW OR REVISED ITEM
> INDICATES ACTION TO BE TAKEN
00546-60100 ...1
Series 1732
SERIAL PREFIX, MANUAL
SERIES NUMBER
OR DATE CODE CHANGE(S)
thru 4
thru 5
thru 6
MANUAL
CHANGE(S)
..••1 thru 3
01A2132.
01A2312.
02A2312.
00546-60100 .
Series 2012
**
**
**
SERIAL PREFIX,
** SERIES NUMBER
** OR DATE CODE
**--------------------
**
**
**
**
**
...•• 1,2 00546-60100
Series 2008
(C5460SX) 1=6809,6812/2=8886E/3=9712E/4=12414,12007/5=14585
Flin- HEWLETT
PACKARD
MANUAL CHANGES MODEL 546A (00546-90005) Page i
Insert this Warning after the Certification/Warranty and Assistance which is
the inside front cover.
WARNING
This product should be connected to apower source that is.
sufficiently isolated from the main supply to prevent the
risk of electric shock.
To further reduce the risk of electric shock, refer to the
service manual for the equipment under test (when applicable)
and follow the manufacturer's service and safety precautions
particularly when voltages exceeding 30 VRMS or 50 VDC are
present.

i
MANUAL CHANGES MODEL 546A (00546-90005) Page 1
#ERRATA
Page 30, Figure 14, NOTE*:
>Change note to read "MP3 NOT USED IN ALL PULSERS. SEE PAGE 33."
Page 33, Table 6, Replaceable Parts:
>Change HP part number for A1R4 to 0686-1325.
Page 36, Figure 16, A1 Schematic Diagram:
>Add two short parallel arrows adjacent to DS1 to indicate a light emitting
diode.
>Change NOTE 3 to "U1 PIN 12 MAY BE CONNECTED TO COMMON IN SOME PULSERS".
>Add "+" symbol adjacent to top terminal of C2 to indicate the positive side
of. the electrolytic capacitor for C2.
Page 32,
Table 6, Replaceable Parts:
>Change A1MP1 from 00546-20202 to 0570-0662 in HP Part Number and Mfr. Part
Number columns.
CHANGE 1(00546-60003 Series 1732)
NOTE -- The circuit board is changed mechanically to incorporate an improved
push
switch. The new 00546-60003 circuit board is electrically identical to
the 00546-60002 SERIES 1644 circuit board.

MANUAL CHANGES MODEL 546A (00546-90005) Page 2
CHANGE 1 (cont'd)
Page 30, Figure 14, Pulser Disassembled:
>Change MP4 to MP14.
>Change MP5 to MP15.
>Change MP8 to MP9.
Page 32, Table 6-1, Replaceable Parts:
>Change A1 part number from 00546-60002 to 00546-60003 for HP &Mfr. Part No.
>Change A1 Series number from 1644 to 1732.
Page 33,
Table 6, A1 (00546-60100) Replaceable Parts:
>Change A1S1 from 00546-00001 to 0546-00002 in HP and Mfr. Part Number columns.
Page 33, Table 6, Miscellaneous Parts:
>Change MP4 to MP14 and Part Number in HP and Mfr. columns from 00546-20201 to
00546-20202.
>Change
MP5 to MP15 and Part Number in HP and Mfr. columns from 00545-20203 to
00545-20205.
>Change
MP8 to MP9 and Part Number in HP and Mfr. columns from 00546-40001 to
00546-40004.
>Add MP10; 00546-40003; RETAINER-SWITCH, BLK PLASTIC; 28480; 00546-40003.
>Add MP11; 0624-0340; 2; SCREW-SELF TAPPING 0-42 (MP10 MTG); 28480; 0624-0340.
>Add MP12; 7120-5268; NAMEPLATE; 28480; 7120-5268 (BOTTOM HALF).
>Add MP13; 7120-5274; LABEL-OPERATING: 28480; 7120-5274 (TOP HALF).
-

1-
I
MANUAL CHANGES MODEL 546A (00546-90005) Page 3
CHANGE 1 (cont'd)
Page 36, Figure 16, A1 Schematic Diagram:
>Change
HP Part Number for A1 from 00546-60002 to 00546-60003 SERIES 1732.
>Add to arrows by DS1 to indicate a LED.
>Change "U1 PIN 2" in NOTE 3 to U1 PIN 12.
CHANGE 2(00546-60003 Series 200B)
Page 32, Table 6, Replaceable Parts:
>Change A1 from series 1732 to 200B.
>Add A1CB; 0160-0576; CAPACITOR FXD 0.1UF 20% 50VDC CER; 26654; 2130BR050R104M.
Page 36, Figure 16, A1 Schematic Diagram:
>Change
A1 series number from 1732 to 200B.
>Add 0.1u capacitor CB across power supply input between emitter of Q3 and
circuit board common.
CHANGE 3(00546-60003 Series 2012)
Page
32, Table 6, Replaceable Parts:
>Change Al from series 2008 to 2012.
>Change
A1C1 (0160-4422) to 0160-5238; CAPACITOR-FXD .B2UF 20% 50VDC DISC CER.
Page 36, Figure 16, Al Schematic Diagram:
>ChangeAl Series from 2008 to 2016.
>Change
A1Cl from 1uf to .82uf.

I
MANUAL CHANGES MODEL 546A (00546-90005) Page 4
HCHANGE 4
Title Page SERIES NUMBERS NOT LISTED:
>Change to read as follows:
For Logic Pulsers with series numbers higher than 1644, or with condensed
Series Numbers provided on the Date Code label, a MANUAL CHANGES sheet is
included with this manual. For series numbers below 1644, refer to the
Backdating paragraph in this manual.
Page 1
SERIES NUMBER:
>Delete the paragraph under "SERIES NUMBER".
>Replace with the following information:
SERIES/DATE CODE
This product is identified by a SERIES CODE and DATE CODE, located on a vinyl
label affixed to the inside of either the top or bottom of the pulser shell.
The Series/Date Code format used in all logic probes is as follows:
"01A2132"
The
first two digits represent a condensed Series Code. When achange occurs
to any model of HP logic probe family which affects the schematic, parts list,
or specifications, the condensed SERIES CODE is incremented by one.
The letter "A" designates the country of origin; "A" indicates USA.

1-
I
MANUAL CHANGES MODEL 546A (00546-90005) Page 5
CHANGE 4 (cont'd)
The last four digits represent the Date Code. The Date Code identifies the
date-of-manufacture for the pulser. The first two digits indicate the year
the product was manufactured; the last two digits indicate the week of that
year. Datecoding originated in the year 1960, at which time the code "00"
was used
for the first two digits to represent 1960. Every year after 1960
the code was incremented by one; for example, the Date Code "2012" indicates
the product was manufactured in the 12th week of the year 1980 (1960+20).
Your pulser will have either a four-digit Series Number stamped on the
printed circuit board or acondensed Series Code, prefixing the Date Code on
a
vinyl label affixed to the inside of the pulser shell.
WHICH CHANGES APPLY TO YOUR LOGIC PULSER?
There is a SERIES/DATE CODE number listed on the cover of the MANUAL CHANGES
sheet. As changes are made, the condensed Series Code is incremented by
one. Make all changes to your manual for Series Codes less than or equal t(
your pulser Series/Date Code.
CHANGE 5
Page 32 and 33,
Table 6. Al (00546-60003) Replaceable Parts:
>Change C6 from 0160-4343 (.lUF) to 0180-0291 lUF +-10% 35 VDC TA.
>Change R3 from 0698-7284 (lOOK) to 0698-7260 10K 1% .05W F TC=O +- 100.
Page 36,
Figure 16. Al Logic Pulser Assembly Schematic Diagram:
>Change
the value for C6 from .1UF to lUF.
>Change
the value for R3 from lOOK to 10K.
IICHANGE 6
On the Title page, Change the Configuration Code from 01A to 02A.

Page 0
Model 546A
- .. _------
Figure 1. HP 546A Logic Pulser

Model 546A
SCOPE OF MANUAL
Page 1
This manual provides operating and service information for the Hewlett-Packard Model 546A Logic
Pulser (Figure 1). The
information includes adescription of the Logic Pulser, accessories available,
specifications, unpacking,
operating characteristics, operating procedures, applications, theory of
operation, maintenance, replaceable parts, and aschematic diagram.
DESCRIPTION
The HP 546A Logic Pulser is a hand-held logic node stimulator used for injecting controlled pulses
into digital logic circuits. The electronics are housed in a hand-held probe. Automatic pulse control
is prov'ided for TTL, OTL, RTL, HTL, MaS, and CMOS logic. Pulse amplitude depends on the logic
supply voltage (3-18V)
which is also the supply voltage for the Logic Pulser. Pulse current and pulse
width depends on the load being pulsed. The frequency and number of pulses generated by the
pulser
is controlled by operation of apush-slide switch on the pulser probe. Aflashing LED indicator
located in the
tip indicates the output mode. Refer to Table 1 for Logic Pulser specifications and to
Figure 2
for accessories available.
SERIES NUMBER
The Logic Pulser does not have aserial number. It does have a four digit series number, which is
stamped on the printed circuit board. Refer to this number and the circuit board part number in any
correspondence
pertaining to maintenance.

Page 2
Table 1. Specifications
Model 546A
Output'
Logic Family Power Supply Voltage Output Current Pulse Width Typical
Output Voltage2
High Low
TTL 5.0 ±10% vdc
:5.650 mA
?0.5 j.ls
?3 vdc
:5.0.8 Vdc
CMOS
3-18 vdc
:5.100 mA
?5 j.ls
?Vsupply -1 vdc
:5.0.5 vdc
15V maximum
Tip Output Overload Protection:
Power Supply Input Protection:
±25V for one minute
±25V for one minute
Short Circuit Protection:
Time Base Accuracy: ±10%
Continuous
Operating Temperature: 0-55°C
Impedance: <2 ohms active; Accessory
Included: Ground Cable
>1 megohm off
Assembly, HP Part No. 00545-60105
Power Supply
Requirements:
Accessory Available: Tip Set, HP
Operating Voltage Range: Part No. 00545-60104
TTL .................
5± 10% vdc
CMOS ................
3-18 vdc
Operating Current: :5.35 mA
'Specifications apply over stated operating voltages
and temperatures for all pulse output modes.
2With
ground clip attached near load.

Model 546A
Tip Kit: 00545-60104 10526-60002
Multi-Pin Stimulus
Kit
Page 3
Figure 2. 546A Logic Pulser Accessories Available

Page 4
UNPACKING
Model 546A
If the shipping package is damaged, ask that the carrier's agent be present when the package is
opened. Inspect the Logic Pulser for obvious physical damage (dents, scratches, etc.). If the Logic
Pulser
is damaged or fails to meet specifications, notify carrier and nearest Hewlett-Packard Sales
and Service office immediately. (Sales and Service offices are listed at the back of this manual.) Re-
tain
shipping package and packaging material for carrier's inspection. The Sales and Service office
will arrange for replacement of your Logic Pulser without waiting for claim against carrier to be
settled.
POWER SUPPLY
The power leads are connected to the power supply of the logic being pulsed (3 to 18V). Reverse
polarity and excess voltage protection are provided. The red power lead is connected to the positive
side
of the power supply.
OUTPUT GROUND CABLE
A connector for the ground cable provided is located at the tip of the Logic Pulser. When maximum
current output is desired, use the ground cable supplied with the Pulser to make the common return
path
as short as possible. Current pulses from the Pulser can be more than 650 mAo The ground cable
reduces the
IR drop and the lead inductance.

Model 546A
OPERATING CHARACTERISTICS
Page 5
The HP 546A Logic Pulser generates pulses
as programmed by a fingertip push-slide switch. The
Pulser
is programmed by pushing the switch once for each single pulse output, or aspecific number
of times for continuous pulse streams or pulse bursts at selected frequencies. The number of times to
push the switch to select an output mode is labeled adjacent to the switch and is described in Table 2.
On the label a dot (e) represents apush; adash (-) represents a hold. As shown in Table 2, the pulses
applied to the LED indicators in the tip are slowed down for visibility.
Pressing the switch automatically drives aTTL, DTL, or CMOS logic output or input from LOW to
HIGH or from HIGH to LOW. The high source and sink current capability of the Pulser can override
integrated circuit output points, originally in either the HIGH or LOW state. The nominal 10 jJ.s pulse
width is long enough for even slow CMOS circuits to accept, but heavy circuit loads (such as TTL
drivers) result in narrower pulses that limit the amount of energy delivered to the device under test.
The Pulser's
output is three-state. In the off-state, the probe's high output impedance ensures that
circuit operation is unaffected by probing until the Pulser switch is pressed. Pulses can be injected
while the circuit is operating and no disconnections are needed. The multi-pin stimulus kit (Figure 2)
is useful for stimulating up to four inputs of agate at the same time, or for stimulating four different
circuit nodes.
The Pulser's
power input and output (tip) circuits are protected against overvoltage and reverse
polarity.

Page 6
Table 2. Output Mode Selection
Model 546A
Switch Action
Output Pulse Rate
Output Pulse Mode LED Indication
(±10%)
Push
single
1Pulse One short flash
Push-hold
100 Hz 100 Hz (Continuous)
10 Hz rate
Push/push-hold 100 Hz 100 Burst. 10 Hz rate during burst
Push/push/push-hold
10 Hz 10 Hz (Continuous)
5Hz rate
Push/push/push/
100 Hz 10 Burst •Two
short flashes and
push-hold a l-second pause
Push/push/push/
1Hz 1Hz
(Continuous)
One flash/second
push/push-hold
• 1 second burst for 100 pulses every two seconds .
•0.1
second burst of 10 pulses once each second.
(01
10 Hz
rrn,ill
546A LOGIC PULSER ]
z
100
-
'0 BURST .. -
0
100 aURST ., H'
....
HEWLETT·PACKARD

Model 546A
Page 7
Apush-push action
of the switch must occur within less than 1second to be effective.
A
hold action of the switch for greater than 1second begins execution of the pro-
grammed output.
Any function can be locked on by the push-slide action of the switch.
Releasing
the switch midway through aburst does not terminate the burst.
The single pulses generated
when aburst is programmed are subtracted from the
first burst, e.g., a
100 burst is output as 1-1-98, lOa, lOa, etc.
Releasing the switch in any
output mode other than midburst terminates output
and allows a new mode to be programmed immediately. Releasing the switch for
longer than 1second, erases the programming of previous pushes.
(3)
(4)
(5)
(6)
OPERATING PROCEDURES
To operate the Pulser, observe the following procedures:
NOTE
In the following step, be sure to connect the red power lead of the Pulser
to the positive side of the power su pply.
a. Connect the power leads of the pulser to the power supply of the logic being pulsed
(3 to 18V). (The Pulser may be powered from a different source, provided the voltage is the
same
as that of the circuit under test and a common ground is used.)
b.
Contact the logic node to be stimulated with the tip of the Pulser.
c. program the generation of pulses by pushing the switch per adjacent markings (refer to
Table 2 for details). Characteristics of the switch operation are described in the following
steps.
(1)
(2)

Page 8 Model 546A
d. The LED's can be used to count the pulses output. Programming bursts of 10 or 100 and count-
ing the lamp flash bursts allows control of aprecise number of output pulses.
APPI.ICA liONS
Hewlett-Packard makes several instruments which assist the troubleshooter in testing logic circuitry
with the Logic Pulser. These instruments are listed in Table 3and examples of their applications are
given in
the following paragraphs.
Table 3. Logic Test Instruments
.Typical Digital Ie
HP Instruments
Troubleshooting Stimulus Response
Shorted IC Input
546A Pulser 547A
Current Tracer and
545A Logic Probe
Stuck Data
Bus
546A Pulser 545A Logic Probe and
547 A Current Tracer
Internal Open in IC 546A Pulser 545A Logic Probe
Solder Bridge 546A Pulser 547A
Current Tracer
Sequential Logic Fault 546A Pulser 548A Logic
Clip
Shorts to Vcc or Ground
546A Pulser 545A Logic Probe
Multi-Pin Testing 546A Pulser 10529A Logic Comparator

Model 546A
Page 9
Logic Gate Testing
Alogic gate may be tested by pulsing the gate's input, while monitoring the output with aLogic Probe
(see Figure 3). The Logic Pulser generates apulse opposite
to the state of the input line and can
change the gate
output's state. This assumes the output of the gate is not clamped in its state by an-
other input, e.g., aHIGH on the other input of an OR gate.
SL
SL
NO CHANGE OF
STATE, INVERTER
IS FAULTY
GATE UNDER
TEST
Figure 3. Logic Gate Testing

Page 10
Model 546A
If the pulse is not detected at the output, pulse the output line (see Figure 4). If the output is not
shorted to V cc or common return, the Logic Probe should indicate apulse opposite to its original indi-
cation. If not, check for external shorts (solder bridges, etc.) before removing the integrated circuit.
Refer also
to Gate-to-Gate Faults paragraph.
I
I
H
L
PROBE
PULSE SWITCH
IS
PROBE
LIGHT DOES NOT
CHANGE
STATE:
LINE IS SHORTED
TO Vee OR GROUND.
Figure 4. Testing for Shorts