HP 8012A User manual

HEWLETTPACKARD
MODEL 8012A
PULSE GENERATOR
This manual corresponds to instruments
with the serial number prefix:
G1121 and below
COPYRIGHT HEWLETT-PACKARD.GMBH 1971
703 BOBLINGEN, HERRENBERGER STR, 110, WEST GERMANY
08012-90000
PRINTED:OCTOBER 71

Mode! 8012A
Section-
Table 1—1. Specifications.
PULSE CHARACTERISTICS
(500 source and load impedance)
Transition Times:
5nS - 0.5S in four ranges. Ranges are common for rise
and fall times but independent verniers provide separate
control of rise and fall time within each range upto
maximum ratios of 100:1 or 1:100,
Linearity:
For transition times > 30nS maximum deviation from a
straight line between the 10% and 90% points is less than
5% of pulse amplitude.
Overshoot and Ringing:
< ± 5% of pulse amplitude.
Preshoot:
< ± 5% of pulse amplitude.
Pulse Width:
< IQnS to IS in four ranges. Vernier provides
continuous adjustment between ranges.
Width Jitter:
< 0.1% + 50pS on any width setting.
Maximum Duty Cycle:
> 75% from 1Hz to 10MHz, decreasing to > 40% at
50MHz.
Maximum Output:
5V across 5012, (10V across open ciruit). Output circuit
protected, cannot be damaged by shorting.
Attenuator:
Four-step attenuator provides the ranges: 0.2 — 0.5V,
0.5 — IV, 1 —2V and 2 — 5V. Vernier provides
continuous adjustment between steps.
Polarity:
Positive or negative, selectable.
Source Impedance:
5012 ± 10%, shunted by (typically) 20pF.
DC Offset:
± 2.5V across 5012 load. Independent of attenuator and
amplitude vernier settings and may be switched off.
Pulse Delay:
< 35nS to IS (with respect to trigger output) in four
ranges; vernier provides continuous adjustment between
ranges.
Delay Jitter:
< 0.1% +50pS on any delay setting.
REPETITION RATE AND TRIGGER
Repetition Rate:
1Hz to 50MHz in four ranges. Vernier provides
continuous adjustment between ranges.
Period Jitter:
<0.1% +50pS on any repetition rate setting.
Square Wave:
0.5Hz to 25MHz in four ranges. Duty cycle 50% ±5%
upto 1MHz, tolerance increases to ± 15% at25MHz.
Trigger Output:
Amplitude: >+1V across 5012.
Width: 16nS± lOnS.
Suitable for triggering another 8012A.
EXTERNALLY CONTROLLED OPERATION
External Triggering
Repetition Rate:
0 to 50MHz. For square wave output, frequency divided
by factor 2.
Trigger input:
Sinewaves > 1.5Vpp ( zero dc ) or pulses > 0.8V,
(positive or negative) at least 7nS wide.
Delay:
25nS ± 8nS between leading edge of trigger input and
trigger output signals.
Maximum Input Amplitude:
<±7V
Input Impedance:
5012 ± 10%
Coupling:
DC-Coupled.
Manual:
Front panel push button for single pulse.
Page 1—1

Section 1 Model 8012A
Table 1—1. Specifications. Continued.
Gating
Synchronous Gating:
Gating signal turns generator "on". First trigger output
pulse is coincident with leading edge of gate pulse. Last
output pulse is always generated with normal width even
if the gate pulse ends during the generation of the
output pulse.
Gate Input:
DC-coupled; voltage at open circuit gate connector
approximately +1.8V. Shorting current < 12mA. Input
impedance approximately 1600.
Gate Input Signal:
Voltage > +1.5V or resistor > 30012 from gate input to
ground enables the repetition rate generator.
Voltage < +0.8V or resistor < 1500 disables the
repetition rate generator.
Gate input is TTL compatible.
Maximum Input Signal:
<± 5V
External Width Input
External Width:
Output pulse width determined by the width of drive
input signal. Transition times and amplitude are selec¬
table. Repetition rate generator running provides trigger
output but these trigger pulses are not related to the
pulses at the output connector.
RZ Mode:
External input (switched to delay generator) determines
pulse period. Transition times, delay, width, and
amplitude are selectable. Trigger output is not related to
RZ Mode output.
Input Signal:
Input Impedance 500; DC-coupled. Signal > +1V, at
least 7nS wide, provides output signal.
Maximum Input Signal:
<± 5V.
GENERAL
Operating Temperature Range:
0°C to +55°C
Power Requirements:
115 or 230V +10%, -15%, 48 to 440 Hz, 70VA
maximum.
Weight:
Net91bs. (4kg,), shipping 14,61bs. (6,5kg.)
Dimensions:
7.9 in. wide, 5.6 in. high, 13 in. deep.
(200 x 142 x 30mm.)
Page 1—2

Model 8012A
Section I
GENERAL INFORMATION
1-1 INTRODUCTION
1—2 The Hewlett-Packard Model 8012A Pulse
Generator is a multi-purpose pulse source, capable of
generating a wide variety of output pulse waveforms,
either as single pulses or as pulse trains with repetition
rates from 1 Hz to 50 MHz. The transition times,
amplitude, width and polarity of the output pulse(s)
may be varied as required by means of easily identified
front panel controls. The pulse width may be deter¬
mined by the pulse generator's width control (normal
mode), by external signals (external width mode), or by
switching the width control to the square wave position —
this causes the output pulse width to equal one half the
pulse period. With the offset control in the off position
the square wave is symmetrical above and below zero
volts. All the output pulses may have their baseline
shifted above and below the zero volt reference line by
means of the front panel offset controls. Trigger pulses
are available for synchronising external circuits and a
delay control enables the delay time between the trigger
and output pulses to be varied as required. Synchronous
gating of the trigger and output pulses is possible by
applying a pulse to the gate input socket.
1—3 Three modes of operation are possible as
follows:
a. Normal Mode: In this mode the
internal oscillator determines the
repetition rate of the output pulses.
The oscillator may be triggered inter¬
nally, externally, or manually; it may
also be gated. A trigger pulse is
generated for each output pulse and
the delay between them may be
varied.
b. External Width Mode: In this mode
external pulses applied to the input
socket on the rear panel determine
the width and repetition rate of the
output pulses. Gating is not possible.
Note that the pulse available at the
trigger output socket, being derived
from the internal oscillator, is not
related to the external width output.
Figure 1-1 HP Model 8012A Pulse Generator
Page 1—3

Section
Model 8012A
1-8 MANUAL IDENTIFICATION
1—7 This instrument carries a 10-character serial
number on the rear panel, the first 5 characters of which
are termed the serial number prefix. If the prefix does
not agree with that quoted on the title page, reference
should be made to the change sheets supplied with the
manual. To obtain further information for any instru¬
ment, contact the nearest Hewlett-Packard Sales/Service
Office, always specify the model number and complete
serial number.
1-8 ORDERING ADDITIONAL MANUALS
1—9 One manual is shipped with each pulse
generator. Additional manuals may be purchased from
the local Hewlett-Packard field office (see list at rear of
this manual for addresses}. Specify the model number
complete serial number prefix, and HP stock number
provided on the title page.
c, RZ Mode: In this mode external
pulses applied to the input socket on
the rear panel determine the repet¬
ition rate of the output pulses. All
other output pulse parameters are
determined by the pulse generator's
front panel controls, but gating is not
possible. Note that the pulse available
at the trigger output socket, being
derived from the internal oscillator, is
not related to the RZ output.
1-4 ACCESSORIES AVAILABLE
1—5 Electronic test equipment, cables, connec¬
tors, adapters, and other accessory items are available
from Hewlett-Packard. For more information on specific
items consult the Hewlett-Packard Catalog or Sales/
Service Office.
Figure 2-1 Pulse Generator and Supplied Accessories
Page 1—4

Model 8012A
Section 11
2—1 INITIAL INSPECTION
2—2 Inspect the instrument for physical damage
and check its operation as soon as possible after delivery.
Section IV contains performance check procedures
which will verify instrument operation within the
published specifications. This check is suitable for
incoming quality control inspection. If physical damage
is evident, or the instrument does not meet specifica¬
tions when received, notify the carrier and the nearest
Hewlett-Packard Sales/Service Office (see list at rear of
this manual). The Sales/Service Office will arrange for
repair or replacement without waiting for settlement of
a claim with the carrier. The certification and warranty
statements for all HP instruments are on the inside front
cover of this manual.
2—3 The instrument is delivered complete with
the following items:
HP Stock Numbers
Power Cord 8120—1692
Fuse, 0.5A for 230V operation. 2110-0202
Fuse, 1 A for 115V operation 2110-0007
2-4 PREPARATION FOR USE
2—5 Power Source Requirements
2—6 The Model 8012A may be operated from an
ac source of 115 or 230 volts +10%, —15%, at 48 to
400 Hz. Power dissipation is 70VA maximum. Carry out
the following procedure if it is required to change the
operating voltage:
a) Disconnect the power cable from the
instrument.
b) Slide the safety window to the left.
c) Remove the fuse by pulling the lever
marked FUSE PULL; this also releases
the voltage selector switch.
d) Slide the voltage selector switch to the
position required (i. e. 115 or 230).
e) Place the appropriate fuse in the fuse
holder and push the lever back into
position.
f) Slide the safety window to the right and
insert the power cable.
2—6 cont..
CAUTION
Ensure that the number visible on
the slide switch and the fuse value
correspond to the line voltage used
before switching the instrument
ON; otherwise, the instrument may
be damaged.
2—7 Power Cable
2-8 The Hewlett-Packard Model 8012 A is
equipped with a 3 - wire power cable, which, when
connected to an appropriate receptacle, grounds the
instrument, cabinet and panels. To preserve this protec¬
tion feature when operating the instrument from
another type of outlet without ground, use an appro¬
priate adapter and connect the ground lead to an
external ground.
2—9 Temperature Requirements
2-10 The Hewlett-Packard Model 8012A uses
solid-state components and requires no special cooling.
The instrument operates within specifications when the
ambient temperature is between 0°C (32°F) and 55°C
(131°F). The pulse generator may be stored at
temperatures between —40°C (-40°F) and 75°C
(167°F).
2-11 REPACKING
2—12 The original shipping carton and packing
material can be used for reshipment. The Hewlett-
Packard Sales/Service Office will also provide infor¬
mation and recommendations on materials to be used if
the original packing material is not available or is
damaged. If the instrument is to be shipped to a
Hewlett-Packard Sales/Service Office for repair, attach a
tag showing owner, model, serial number, and repairs
required.
Page 2—1

Section III Model 8012A
SECTION III
OPERATING INSTRUCTIONS
3-1 INTRODUCTION
3-2 Figure 5-1 shows the location of the
controls and connectors; the reference numbers used
appear when appropriate in the following text in bold
type. As previously explained, there are three operating
modes and the necessary operating procedure for each
will now be described. Reference may also be made to
the block diagram, figure 5-2.
3-3 NORMAL MODE
3—4 There are five ways of operating in the
normal mode:
1. Where the repetition rate is determ¬
ined by the internal oscillator, inter¬
nally triggered.
2. As above, but with the oscillator
triggered externally.
3. Manually triggered,
4. In each of the above, square wave
output (pulse width = pulse period/2)
may be selected instead of the
variable pulse width.
5. The outputs obtained above may be
gated.
All output pulses are preceded by a trigger pulse
(TRIGGER OUTPUT socket 17). The delay is fixed at
35nS for square waves but may otherwise be adjusted by
the PULSE DELAY switch 6 and VERNIER 7.
3-5 Internal Trigger
3—6 The appropriate circuits and controls are
shown in figure 3-1. Use the following procedure to
obtain an output similar to that shown in figure 3—2.
a. Set the Mode Selector 21 to N.
b. Set the PULSE PERIOD switch 1 to
the range required, then adjust the
VERNIER 2 to obtain the exact pulse
period.
c. Set the PULSE DELAY switch 6 to
the range required, then adjust the
VERNIER 7 until the delay time
required between the trigger and
output pulses is obtained. The delay
time must always be less than the
pulse period.
d. Set the PULSE WIDTH switch 10 to
the range required, then adjust the
VERNIER 11 to obtain the exact
pulse width.
e. Set the AMPLITUDE switch 4 to the
range required, then adjust the
VERNIER 9 to obtain the exact
amplitude.
f. Set the TRANSITION TIME switch 3
to the range required, then adjust the
RISETIME vernier 8 and FALLTIME
vernier 12 for the exact risetime and
falltime required.
g. Set the POLARITY switch 19 to the
position + to obtain positive output
pulses or to — to obtain negative
output pulses,
h. If the baseline of the output pulses is
to be zero volts, set the OFFSET
switch 13 to OFF.
If the baseline is to be positive or
negative, set the OFFSET switch 13
to ON and rotate the vernier 14 until
the required offset voltage is
obtained.
ortser o
vtimtp ft
Figure 3-1 Operation Block Diagram: Normal Mode -
Internal Trigger
Page 3—1

Model 8012A
Section III
_A_/l
Pulse
Width
Trigger output pulses
(TRIGGER OUTPUT 17!
Positive output pulses
(OUTPUT 20)
No baseline offset.
OV
-V
+v
tv
OV
r
/
N. Negative output pulses
\ (OUTPUT 20)
Positive output pulses
\
positive baseline offset.
Positive Output pulses
Negative baseline offset.
Negative output pulses
Positive baseline offset.
Figure 3-2 Output Waveforms: Normal Mode -
Internal Trigger,
3—7 External Trigger
3—8 The appropriate circuits and controls are
shown in figure 3--3. Use the following procedure to
obtain an output similar to that shown in figure 3-4.
H/iS£ OIL Ay 6 PULSt worn :0
pulse period i vefiwifr y vtsmza n
arrscj u
VCRRtCP 14
Figure 3-3 Operation Block Diagram: Normal Mode -
External Trigger.
> *!V
OV _
A
Trigger output pulses
(TRIGGER OUTPUT 17)
+V
OV
< 36itS to 1 Sac.
Positive output pulses
(OUTPUT 20)
a. Set the Mode Selector 21 to N.
b. Apply suitable trigger pulses to the
TRIGGER INPUT socket 16.
c. Set the PULSE PERIOD switch 1 to
EXT+ for positive trigger input pulses
or to EXT- for negative trigger input
pulses.
d. Set the delay between the trigger and
output pulses as described in para¬
graph 3—6,
e. Set the width, amplitude, risetime,
falltime, polarity and offset of the
output pulses as described in para¬
graph 3-6.
Figure 3-4 Output Waveforms: Normal Mode
External Trigger.
Page 3-2

Mode! 8012A
Section !l
3—9 Manual
3—10 The appropriate circuits and controls are
shown in figure 3-5. Use the following procedure to
obtain an output similar to that shown in figure 3—6:
a. Set the Mode Selector 21 to N.
b. Set the PULSE PERIOD switch 1 to
either EXT+ or EXT-.
c. Set the delay between the trigger and
output pulse as described in para¬
graph 3-6.
d. Set the width, amplitude, risetime,
falltime, polarity and offset of the
output pulse as described in para¬
graph 3-6.
e. Press the MAN button 5 once for
each output pulse required.
omttr >3
vcnrutn m
3—11 Square Wave
3—12 The appropriate circuits and controls are
shown in figure 3—7. Use the following procedure to
obtain an output similar to that shown in figure 3—8.
a. Set the Mode Selector 21 to N.
b. Set the PULSE PERIOD switch 1 to
an internal range as described in
paragraph 3-6 or to EXT as de¬
scribed in paragraph 3—8 and apply
external trigger pulses in order to set
the repetition rate of the output
pulses.
c. Set the PULSE WIDTH switch 10 to
SQUARE WAVE.
d. Set the amplitude, risetime, falltime,
polarity and offset of the output
pulses as described in paragraph 3—6.
WMF. HH'Ofl > PVi$£ WIDTH >0
Vf.fiH/tfi 7 ISQUAfit WAVf.>
OFFSET 13
VtfiNtf*
Figure 3-5 Operation Block Diagram: Normal Mode -
Manual.
Figure 3-7 Operation Block Diagram: Normal Mode -
Square Wave.
Output when MAN button 6 pressed once:
Trigger output pulse
(TRIGGER OUTPUT 1?)
Positive output pulse
(OUTPUT 20)
Pulses may be negative and
the baseline offset as shown
in figure 3-2.
A_A
Trigger output pulses
(TRIGGER OUTPUT 17)
Positive output pulses
(OUTPUT 20)
Output pulses may also be
negative end Ihe baseline
offset as shown in tigure
3-2.
Figure 3-6 Output Waveforms: Normal Mode - Manual. Figure 3-8 Output Waveforms: Normal Mode - Square Wave.
Page 3—3

Model 8012A
Section III
Remember the following points about the square wave
output:
Output pulse width equals half the selected pulse period,
Output pulse rate is one-half that of the rate generator
(or input trigger pulse).
The delay between input trigger pulse and square wave
output is fixed.
The output pulse is symmetrical above and below
ground.
3—13 Gating
3—14 The trigger and output pulses obtained in
the normal mode may be gated by applying an
appropriate gate pulse (see specifications) to the GATE
INPUT socket 18; the operation is indicated in figure
3-9.
Figure 3-9 Output Waveforms: Normal Mode - Gating.
3-15 RZ MODE
3-16 External pulses (applied to the INPUT
socket 22 on the rear panel) trigger the delay generator
directly (figure 3-10) and the shape of the output
pulses is determined by the pulse forming circuits
following the delay generator.
The output pulses cannot be gated and, as explained in
paragraph 3—19, are independent of the pulses at the
TRIGGER OUTPUT socket 17.
c. Set the PULSE WIDTH switch 10 to
the required range, then adjust the
VERNIER 11 for the exact pulse
width.
d. Set the amplitude, risetime, falltime,
polarity and offset of the output
pulses as described in paragraph 3-6.
OFf$cr >j
VMMW U
Figure 3-10 Operation Block Diagram: RZ Mode.
f~«>. ■ *1.
i > 7nS
Variable Delay * Variable 1
< 36nS to IS. Width
RZ input pubs period * output pulse period.
RZ input pulses
(INPUT 22!
Positive output pulses
(OUTPUT 20).
Output pulses may also be
negative.The baseline
may be offset.
Figure 3-11 Output Waveform: RZ Mode.
3-17 EXTERNAL WIDTH MODE
The following procedure should be used to obtain
outputs similar to those indicated in figure 3—11.
a. Set the Mode Selector 21 to RZ.
b. Set the delay between the external
applied pulses and the resulting out¬
put pulses by selecting the range
required on the PULSE DELAY
switch 6 and adjusting the VERNIER
7.
3-18 External pulses (applied to the INPUT
connector 22 on the rear panel) trigger the transition
time circuit (figure 3-12). The output thus obtained
cannot be gated and, as explained in paragraph 3-19, is
independent of the TRIGGER OUTPUT 17. The
following procedure should be used to obtain outputs
similar to those shown in figure 3—11.
a. Set the Mode Selector 21 to EXT.
WIDTH.
Page 3—4

Section li
Model 8012A
b. Set the amplitude, risetime, falitime,
polarity and offset of the output
pulses as described in paragraph
3-16.
owsbt
vemrn u
Figure 3-12 Operation Block Diagram:External Width
Mode
Irregular external width
input pulses (INPUT 22).
Positive output pulses
(OUTPUT 20).
Note: A small delay exists between the
input and output pulses.
Output pulses may be negative
and the output pulse baseline
offset as shown in figure 3-2.
Figure 3-13 Output Waveforms: External Width Mode
3__20 When operating in the RZ or EXT.WIDTH
modes, the internal oscillator is available for use as an
independent clock generator (figure 3—14) which
provides an output at the TRIGGER OUTPUT connec¬
tor 17. This output may be triggered internally,
externally, or manually, and in addition gated, as
described for the normal operating mode (paragraph
3-3). If this facility is not required, it may be switched
off by setting the PULSE PERIOD control 1 to EXT and
disconnecting the TRIGGER INPUT 16.
Figure 3-14 Operation Block Diagram: Additional Faci¬
lities - RZ/EXT.WIDTH Mode.
Page 3—5