Tfektronix
COMMITTED TO EXCELLENCE
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-4119-00
Product Group 40
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
2337
OSCILLOSCOPE
OPERATORS
INSTRUCTION
Serial Number
________________
MANUAL
First Printing SEP 1981
Revised MAY 1983
TABLE OF CONTENTS
Page
LIST OF ILLUSTRATIONS.................................................iii
LIST OF TABLES....................................................................v
OPERATORS SAFETY SUMMARY
....................................
vi
INTRODUCTION....................................................................1
PREPARATION FOR USE
....................................................
2
LINE VOLTAGE SELECTION
.......................................
2
LINE FUSE
........................................................................
4
POWER CORD....................................................................5
CONTROLS, CONNECTORS, AND INDICATORS
..........
6
POWER AND DISPLAY....................................................6
VE R TICAL.........................................................................7
HORIZONTAL..................................................................10
ATRIG GER....................................................................12
BTRIGGER
................................................
15
REAR PANEL..................................................................18
Page
OPERATING CONSIDERATIONS
....................................
20
GRATICULE................................. 20
GROU NDIN G.................................................................20
SIGNAL CONNECTIONS...............................................21
INPUT COUPLING CAPACITOR
PRECHARGING..............................................................21
INSTRUMENT COOLING
............................................
22
INSTRUMENT FA MILIARIZATIO N
...............................
23
INTRODUCTION
...........................................................
23
EQUIPMENT REQUIRED
............................................
23
NORMAL SWEEP DISPLAY..........................................24
DISPLAYING A SIGNAL...............................................26
OPERATOR'S CHECKS AND ADJUSTMENTS
..............
36
INTRODUCTION
...........................................................
36
TRACE ROTATION
......................................................
36
PROBE COMPENSATION
............................................
37
ASTIGMATISM..............................................................38
VERTICAL GAIN CHECK
............................................
39
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TABLE OF CONTENTS (cont)
Page
BASIC APPLICATIONS.......................................................40
NONDELAYED MEASUREMENTS
.............................
40
AC Peak-to-Peak Voltage
..........................................
40
Instantaneous DC Voltage..........................................42
Algebraic A d d ition
....................................................
43
Common-Mode Rejection..........................................45
Time Duration............................................................46
Frequency
...................................................................
48
Rise Tim e
...................................................................
48
Time Difference Between Two
Time-Related Pulses
....................................................
50
Phase Difference
.........................................................
51
Amplitude Comparison
...............................................
53
Time Comparison.......................................................55
DELAYED-SWEEP MAGNIFICATION
........................
57
Magnified Sweep Runs After Delay
...........................
57
Pulse Jitter Time Measurement
..................................
59
Triggered Magnified Sweep
.......................................
60
DELAYED-SWEEP TIME MEASUREMENTS
..............
60
Time D uration............................................................61
Page
Rise T im e....................................................................61
Time Difference Between Repetitive Pulses
..........
63
Time Difference Between Two
Time-Related Pulses
....................................................
65
DMM DISPLAYS AND MEASUREMENTS
................
67
Resistance....................................................................67
RMS A C ......................................................................67
DC Volts......................................................................68
OPTIO NS..............................................................................69
OPTION 0 3 ......................................................................69
SPECIFICATION
.................................................................
70
ACCESSORIES......................................................................99
STANDARD ACCESSORIES INCLUDED
...................
99
OPTIONAL POWER CORDS
..........................................
99
APPENDIX A .......................................................................100
CHANGE INFORMATION
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LIST OF ILLUSTRATIONS
Figure Page
The 2337 Oscilloscope...........................................................................................................................viii
1 LINE VOLTAGE SELECTOR switch, line fuse, and power c ord
......................................................
3
2 Optional power cords.................................................................................................................................5
3 Power and display controls and indicators.............................................................................................7
4 Vertical controls, connectors, and indicators and calibrator output....................................................8
5 Horizontal controls and indicator..........................................................................................................10
6 A TRIGGER controls, connector, and indicator.................................................................................13
7 DMM and B TRIGGER controls, connectors, and LCD readout........................................................16
8 Rear-panel connectors............................................................................................................................19
9 Graticule measurement m arkings..........................................................................................................20
10 Initial setup for instrument familiarization procedure.........................................................................27
11 Probe compensation..................................................................................................................................38
12 Vertical display accuracy.......................................................................................................................39
13 Peak-to-peak waveform voltage.............................................................................................................41
14 Instantaneous voltage measurement.....................................................................................................43
15 Algebraic addition...............................................................................< .................................................45
16 Common-mode rejection.........................................................................................................................46
17 Time duration...........................................................................................................................................47
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Fig
18
19
20
21
22
23
24
25
26
27
LIST OF ILLUSTRATIONS (cont)
Page
Rise tim e...................................................................................................................................................49
Time difference between two time-related pulses................................................................................51
Phase difference......................................................................................................................................53
High-resolution phase difference.............................................................................................................53
Delayed-sweep magnification..................................................................................................................58
Pulse jitter................................................................................................................................................59
Time duration using delayed sweep....................................................................................................... 62
Rise time, differential time method....................................................................................................... 63
Time difference between repetitive pulses...........................................................................................64
Time difference between two time-related pulses
................................................................................
66
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LIST OF TABLES
Table Page
1 Line Voltage and Fuse Selection..............................................................................................................4
2 Option 03 Line Voltage and Fuse Selection..........................................................................................4
3 DMM Autoranging................................................................................................................................... 17
4 Equipment Required for Instrument Familiarization Procedure........................................................24
5 Electrical Characteristics.........................................................................................................................72
6 Environmental Characteristics...............................................................................................................95
7 Physical Characteristics........................................................................................................................... 97
8 Option Electrical Characteristics............................................................................................................98
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OPERATORS SAFETY SUMMARY
The general safety information in this part o f the summary is for both operating and servicing personnel. Specific warnings
and cautions w ill be found throughout the manual where they apply and do not appear in this summary.
Terms in This Manual
CAUTION statements identify conditions or practices
that could result in damage to the equipment or other
property.
WARNING statements identify conditions or practices
that could result in personal injury or loss of life.
Terms as Marked on Equipment
CAUTION indicates a personal injury hazard not
immediately accessible as one reads the markings, or a
hazard to property, including the equipment itself.
DANGER indicates a personal injury hazard immedi
ately accessible as one reads the marking.
Symbols in This Manual
A
This symbol indicates where applicable
cautionary or other information is to be
found. For maximum input voltage see
Table 5.
Symbols as Marked on Equipment
DANGER — High voltage.
Protective ground (earth) terminal.
ATTENTION — Refer to manual.
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Power Source
This product is intended to operate from a power
source that does not apply more than 250 volts rms
between the supply conductors or between either supply
conductor and ground. A protective ground connection
by way of the grounding conductor in the power cord is
essential for safe operation.
Grounding the Product
This product is grounded through the grounding con
ductor of the power cord. To avoid electrical shock, plug
the power cord into a properly wired receptable before
connecting to the product input or output terminals. A
protective ground connection by way of the grounding
conductor in the power cord is essential for safe operation.
Danger Arising From Loss of Ground
Upon loss of the protective-ground connection, all
accessible conductive parts (including knobs and controls
that may appear to be insulating) can render an electric
shock.
Use the Proper Power Cord
Use only the power cord and connector specified for
your product.
Use only a power cord that is in good condition.
For detailed information on power cords and con
nectors see Figure 2.
Use the Proper Fuse
To avoid fire hazard, use only a fuse of the correct type,
voltage rating and current rating as specified in the parts
list for your product.
Do Not Operate in Explosive Atmospheres
To avoid explosion, do not operate this product in
an explosive atmosphere unless it has been specifically
certified for such operation.
Do Not Remove Covers or Panels
To avoid personal injury, do not remove the product
covers or panels. Do not operate the product without the
covers and panels properly installed.
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INTRODUCTION
The TEKTRONIX 2337 Oscilloscope is a rugged, light
weight, dual-channel, 100-MHz instrument with a general-
purpose digital multimeter (DMM). It also features a
compact crt that provides sharply defined traces. The
vertical system supplies calibrated deflection factors from
5 mV per division to 5 V per division. Sensitivity can be
increased to at least 2 mV per division by the variable
VOLTS/DIV VAR control. Trigger circuits enable stable
triggering over the full bandwidth of the vertical system.
The horizontal system provides calibrated sweep speeds
from 0.5 s per division to 50 ns per division, along with
delayed-sweep features, thus accommodating accurate
relative-time measurements. A X10 magnifier circuit
extends the maximum sweep speed to 5 ns per division
when the SEC/DIV switch is set to 0.05 ps.
A 3 1/2-digit LCD (liquid crystal display) readout
enables rapid measurement of time difference between any
two points on the oscilloscope display.
The DMM portion measures dc voltage, resistance, and
true rms ac voltage. Measurement values are displayed on
the LCD readout, together with polarity, overrange, and
function indicators.
The instrument is shipped with the following standard
accessories:
2 Probe packages
1 Accessory pouch
1 Operators manual
1 Service manual
1 Accessory pouch, zip lock
1 Crt filter, clear plastic
2 1,0-A AGC fast-blow fuses
1 0.5-A AGC fast-blow fuse
1 Pair test leads
For part numbers and further information about both
standard and optional accessories, refer to the "Acces
sories" page at the back of this manual. Your Tektronix
representative or local Tektronix Field Office can also
provide accessories information.
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PREPARATION FOR USE
Refer to the Safety Summary at the front of this manual
for power source, grounding, and other safety considera
tions pertaining to the use of the 2337. Before connecting
the instrument to a power source, read the following infor
mation, then verify that the LINE VOLTAGE SELECTOR
switch is properly set for the ac power source being used
and that the proper power-input fuse is installed.
This instrument may be damaged if operated with
the LINE VOLTAGE SELECTOR switch set for the
wrong applied ac power input source voltage or if the
wrong line fuse is installed.
LINE VOLTAGE SELECTION
The 2337 operates from either a 115-V or a 230-V
nominal ac power input source with a line frequency
ranging from 48 Hz to 440 Hz. Before connecting the
power cord to a power input source, verify that the LINE
VOLTAGE SELECTOR switch, located on the rear panel
(see Figure 1), is set for the correct nominal ac power input
source voltage. To convert the instrument for operation
from one line-voltage range to the other, move the LINE
VOLTAGE SELECTOR switch to the correct nominal ac
source voltage position (see Table 1). If your instrument is
equipped with Option 03 (100-V/200-V Power Trans
former), use Table 2. The detachable power cord may have
to be changed to match the power source outlet.
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LINE VOLTAG E
SELECTOR SW ITC H
DETACHAB LE
POW ER CO RD
____________
CO RD-SE T-
SEC UR ING
CLAM P
LINE
FUSE
4119-02
Figure 1. LINE VO LTAG E SELECTOR switch, line fuse, and power cord.
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Table 1
Line Voltage and Fuse Selection
LINE FUSE
Line Voltage
Selector Switch
Voltage
Position
Range
Fuse Data
115 V Nominal
100 to 132 V
1.0 A, 250 V, Fast-blow
230 V Nominal
200 to 250 V
0.5 A, 250 V, Fast-blow
Table 2
Option 03 Line Voltage and Fuse Selection
Line Voltage
Selector Switch Voltage
Position Range
Fuse Data
100 V Nominal
90 to 115 V
1.0 A, 250 V, Fast-blow
200 V Nominal
180 to 230 V
0.5 A, 250 V, Fast-blow
To verify that the instrument power-input fuse is of
proper value for the nominal ac source voltage, perform
the following procedure:
1. Press in the fuse holder cap and release it with a
slight counterclockwise rotation.
2. Pull the cap (with the attached fuse inside) out of
the fuse holder.
3. Verify proper fuse value (see Tables 1 and 2).
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POWER CORD
This instrument has a detachable, three-wire power cord
with a three-contact plug for connection to both the power
source and protective ground. Its power cord is secured to
the rear panel by a cord-set-securing clamp. The plug
protective-ground contact connects (through the power-
cord protective grounding conductor) to the accessible
metal parts of the instrument. For electrical-shock pro
tection, insert this plug into a power source outlet that has
a properly grounded protective-ground contact.
Instruments are shipped with the required power cord
as ordered by the customer. Available power cord options
are illustrated in Figure 2, and their part numbers are listed
on the "Accessories" page at the back of this manual.
Contact your Tektronix representative or local Tektronix
Field Office for additional power-cord information.
NOTE
See APPENDIX A at the back of this manual for fur
ther power input information. Figure 2. Optional power cords.
Plug
Configuration
Usage
Nominal
Line-
Voltage
(AC)
Reference
Standards
Option #
North
American
120 V/
15A
120 V
ANSI C73.11*h
NEMA 5-15-P
IEC 83c
Standard
Universal
Euro
240V/
10-16A
240V
CEE (7), II, IV,
V lld
IEC 83c
A1
UK
240V/
13A
240V
BS 1363®
IEC 83c
A2
&
Australian
240V/
10A
240V
ASC 112t A3
North
American
240V /
15A
240V
ANSI C73.201
NEMA 6-15-P
IEC 83c
A4
aANSI—American National Standards Institute
bNEM A—National Electrical Manufacturer's Association
CIEC—International Electrotechnical Commission
dCEE—International Commission on Rules for the Approval of
Electrical Equipment
eBS—British Standards Institution
fAS—Standards Association of Australia 2931-05
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CONTROLS, CONNECTORS, AND INDICATORS
This section of the manual will familiarize the operator
with the location and function of instrument controls,
connectors, and indicators.
POWER AND DISPLAY
Refer to Figure 3 for location of items 1 through 8.
Q POWER Switch—Turns instrument power on and off.
Press in for ON; press again for OFF.
(T ) FOCUS Control—Adjusts for optimum display
definition.
(T ) ASTIG Control—Screwdriver control used in con
junction with the FOCUS control to obtain a well-
defined display over the entire graticule area. It does
not require readjustment during normal operation
of the instrument.
(T ) INTEN Control—Determines the brightness of the crt
display (has no effect when BEAM FIND switch is
pressed in).
(T ) BEAM FIND Switch—When held in, compresses the
display to within the graticule area and provides a
visible viewing intensity to aid in locating off-screen
displays.
(T ) TRACE ROTATION Control—Screwdriver control
used to align the crt trace with the horizontal grati
cule lines.
Internal Graticule—Eliminates parallax viewing error
between the trace and graticule lines. Rise-time
amplitude measurement points are indicated at the
left edge of the graticule.
(T ) SERIALand Mod Slots—TheSERIALsIot is imprinted
with the instrument's serial number. The Mod slot
contains the option number that has been installed in
the instrument.
6 2337 Operators @
VERTICAL
Refer to Figure 4 for location of items 9 through 19.
(^T) AMPL CAL Connector—Provides a 0.2 V, positive
going square-wave voltage (at approximately 1 kHz)
that permits the operator to compensate voltage
probes and to check oscilloscope vertical operation.
It is not intended to verify time-base calibration.
® CH 1 OR X and CH 2 OR Y Connectors—Provide for
application of external signals to the inputs of the
vertical deflection system or for an X-Y display. In
the X-Y mode, the signal connected to the CH 1 OR
X connector provides horizontal deflection, and the
signal connected to the CH 2 OR Y connector
provides vertical deflection.
@ Input Coupling Switches (AC-GND-DC)-Select the
method of coupling input signals to the vertical
deflection system.
AC—Input signal is capacitively coupled to the
vertical amplifier. The dc component of the
input signal is blocked. Low-frequency lim it
(—3 dB point) is approximately 10 Hz.
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Figure 3. Power and display controls and indicators.
Figure 4. Vertical controls, connectors, and indicators and
calibrator output.
GND—The input of the vertical amplifier is
grounded to provide a zero (ground) reference
voltage display (does not ground the input signal).
Allows precharging the input coupling capacitor.
DC—All frequency components of the input signal
are coupled to the vertical deflection system.
(j? ) CH 1 VOLTS/DIV and CH 2 VOLTS/DIV Switches-
Select the vertical deflection factor in a 1-2-5
sequence. VAR control must be in detent to obtain
a calibrated deflection factor.
IX PROBE—Indicates the deflection factor
selected when using either a IX probe or coaxial
cable.
10X PROBE—Indicates the deflection factor
selected when using a 10X probe.
(l? ) VAR Controls—Provide continuously variable uncal
ibrated deflection factors between the calibrated
settings of the VOLTS/DIV switches when rotated
clockwise out of the detent position. Channel 1
VOLTS/DIV VAR control is inoperative when X-Y
VERTICAL MODE is selected.
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M4) UNCAL Indicator—LED illuminates to indicate that
either Channel 1 or Channel 2 VOLTS/DIV VAR
control is out of calibrated detent (vertical deflection
factor is uncalibrated).
VERTICAL MODE Switches—Five push-button
switches that select the mode of operation for the
vertical amplifier system.
CH 1—Selects only the Channel 1 input signal for
display.
ALT—The display alternates between Channel 1
and Channel 2 input signals. The alternation
occurs during retrace at the end of each sweep.
This mode is useful for viewing both vertical
input signals at sweep speeds from 0.2 ms per
division to 0.05 ps per division.
CHOP—The display switches between the Channel
1 and Channel 2 input signals during the sweep.
The switching rate is approximately 500 kHz.
This mode is useful for viewing both Channel 1
and Channel 2 inputs at sweep speeds from 0.5 ms
per division to 0.5 s per division.
ADD—Selects the algebraic sum of the Channel 1
and Channel 2 input signals for display.
CH 2—Selects only the Channel 2 input signal
for display.
AUTO—Press in both ALT and CHOP buttons.
The A Sweep circuitry automatically selects the
most useful switching method (ALT or CHOP)
for dual displays.
X-Y—Press in both CH 1 and CH 2 buttons. The
X-signal is applied through the Channel 1 input
connector, and the Y-signal is applied through
the Channel 2 input connector.
(j? ) CH 2 INVERT Switch—Inverts Channel 2 display
when button is pressed in. Push button must be
pressed in a second time to release it and regain a
noninverted display.
(l7 ) POSITION Controls—Determine the vertical position
of the displays on the crt. When X-Y VERTICAL
MODE is selected, the Channel 2 POSITION control
moves the display vertically (Y-axis), and the Hori
zontal POSITION control moves the display hori
zontally (X-axis).
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9
(T?) BW LIMIT Switch—Limits the bandwidth of the
vertical amplifier to approximately 20 MHz when
pressed in. Push button must be pressed a second
time to release it and regain full 100-MHz bandwidth
operation. Provides a method for reducing inter
ference from unwanted high-frequency signals when
viewing low-frequency signals.
(fiT) TRIG VIEW Switch-Press in and hold this push
button to display a sample of the signal present in
the A Trigger amplifier (for all A TRIGGER
SOURCE switch settings except VERT MODE).
All other signal displays are removed while the
TRIG VIEW push button is held in.
HORIZONTAL
Refer to Figure 5 for location of items 20 through 26.
(20) B DELAY TIME POSITION-A TIME POSITION
Controls—Select the amount of delay time between
start of the A Sweep and start of the B Sweep. Delay
time is variable to at least 10 times the A SEC/DIV
switch setting. The B DELAY TIME POSITION
(outer knob) controls the reference point when the
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2337 Operators
4119 06
@
Figure 5. Horizontal controls and indicator.
B TRIGGER SOURCE switch is set to either A TIME
or RUN AFTER DLY. The A TIME (inner knob)
controls the time-measurement point only when the
B TRIGGER SOURCE switch is set to A TIME. When
the time-measurement point is to the left of the
reference point, the LCD readout indicates a negative
time difference.
(2?) A AND B SEC/DIV Switches—Selects the sweep
speed for the A and B Sweep generators in a 1-2-5
sequence. The A SEC/DIV switch sets the time
between the B Sweeps (delay time). For calibrated
sweep rates, the TIME (PULL) VAR control must be
in the calibrated detent (fully clockwise position).
A SEC/DIV—The A Sweep speed is shown
between the two black lines on the clear plastic
skirt. This switch also selects the delay time (used
in conjunction with the B DELAY TIME POSI
TION control) for delayed sweep operation.
B SEC/DIV—The B Sweep speed is set by pulling
the inner knob and rotating it to a setting shown
by the white line scribed on the knob. The B
Sweep circuit is used for delayed sweep operation
only.
(22) TIME (PULL) VAR Control—Provides continuously
variable, uncalibrated A Sweep speeds between SEC/
DIV switch settings to at least 2.5 times the cali
brated setting (extends slowest sweep speed to at
least 1.25 s per division). To operate this control, pull
out the VAR knob and rotate it counterclockwise
out of the detent.
(2?) UNCAL Indicator LED—Illuminates to indicate that
the A Sweep speed is uncalibrated when the TIME
(PULL) VAR control is rotated out of the calibrated
detent.
(24) HORIZ MODE Switches-Three push-button switches
that select the mode of operation for the horizontal
deflection system.
A—Horizontal deflection is provided by the A
Sweep generator at a sweep speed determined by
the setting of the A SEC/DIV switch.
A INTEN—Horizontal deflection is provided by
the A Sweep generator at a speed determined by
the A SEC/DIV switch. The B Sweep generator
provides an intensified zone on the display. The
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length of the intensified zone is determined by
the setting of the B SEC/DIV switch. The location
of the intensified zone is determined by the setting
of the B DELAY TIME POSITION-A TIME
POSITION controls.
B—Horizontal deflection is provided by the B
Sweep generator at a sweep speed determined by
the setting of the B SEC/DIV switch. The start
of the B Sweep is delayed from the start of the A
Sweep by a time determined by the settings of the
A SEC/DIV switch and the B DELAY TIME
POSITION-A TIME POSITION controls.
(25) X10 MAG Switch—When pressed in, increases the
displayed sweep speed by a factor of 10. Extends
fastest sweep speed to 5 ns per division. Push button
must be pressed in a second time to release it and
regain the XI sweep speed.
(26) POSITION Control—Positions the display hori
zontally in all modes. Provides both coarse and fine
control action. Reverse the direction of rotation to
actuate fine positioning feature. When X-Y VER
TICAL MODE is selected, the Horizontal POSITION
control moves the display horizontally (X-axis).
A TRIGGER
Refer to Figure 6 for location of items 27 through 34.
(27) SLOPE Switch—Selects the slope of the signal that
triggers the sweep.
+ (plus)—When push button is released out,
sweep is triggered from the positive-going slope of
the trigger signal.
— (minus)—When push button is pressed in, sweep
is triggered from the negative-going slope of the
trigger signal.
(2?) LEVEL Control—Selects the amplitude point on the
trigger signal at which the sweep is triggered. The
LEVEL control is usually adjusted for the desired
display after trigger SLOPE, COUPLING, and
SOURCE switch settings have been selected.
(29) Trigger Mode Switches—Three push-button switches
that determine the trigger mode for the A Sweep.
AUTO—Permits triggering on waveforms with
repetition rates down to approximately 10 Hz.
12 2337 Operators
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Sweep free runs and provides a baseline trace
either in the absence of an adequate trigger signal
or when the repetition rate of the trigger signal
is below approximately 10 Hz.
NORM—Sweep is initiated when an adequate
trigger signal is applied. In the absence of a trigger
signal, no baseline trace will be present.
SGL SWP—Press in the spring-return push button
momentarily to arm the A Sweep circuit for a
single sweep display. This mode operates the same
as NORM, except only one sweep is displayed for
each trigger signal. Another single sweep cannot be
displayed until the SGL SWP push button is
momentarily pressed in again to reset the A Sweep
circuit. This mode is useful for displaying and
photographing either nonrepetitive signals or
signals that cause unstable conventional displays
(e.g., signals that vary in amplitude, shape, or
time).
(30) TRIG'D-READY Indicator LED—Illuminates when
either AUTO or NORM Trigger Mode is selected to
indicate that the A Sweep is triggered (TRIG'D).
When SGL SWP Trigger Mode is selected, the LED
______
illuminates to indicate that the trigger circuit is
armed (READY) for a single sweep display. Pig<
@ 2337 Operators
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ire 6. A TRIGGER controls, connector, and indicator.
^3?) SOURCE Switch—Determines the source of the trig- (33^
ger signals coupled to the input of the trigger circuit.
VERT MODE—The internal trigger source is
determined by the signals selected for display by
the VERTICAL MODE switches.
CH 1—The signal applied to the CH 1 input
connector is the source of the trigger signal.
CH 2—The signal applied, to the CH 2 input
connector is the source of the trigger signal.
LINE—Provides a trigger signal from a sample of
the ac-power-source waveform. This trigger source
is useful when channel input signals are time
related (multiple or submultiple) to the frequency
of the power-input source voltage.
EXT—Permits triggering on signals applied to the
External Trigger Input connector (A EXT).
EXT-MO—External trigger signals are attenuated
by a factor of 10.
(32) A EXT Connector—Provides a means of applying
external signals to the trigger circuit.
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2337 Operators
(COUPLING Switch—Determines the method used to
couple the trigger signal to the input of the trigger
circu it.
AC—Signals above 20 Hz are capacitively coupled,
blocking any dc components of the signal. Signals
below 20 Hz are attenuated.
LF REJ—Signals are capacitively coupled. The
dc component is blocked, and signals below
approximately 50 kHz are attenuated. This
position is useful for providing a stable display of
the high-frequency components of a complex
waveform.
HF REJ—Signals are capacitively coupled. The
dc component is blocked, and signals below
approximately 20 Hz and above approximately
50 kHz are attenuated. This position is useful for
providing a stable display of the low-frequency
components of a complex waveform.
DC—All components of the signal are coupled to
the A Trigger circuitry. This position is useful for
displaying low-frequency or low-repetition-rate
signals.
@
(34) TRIG HOLDOFF (PUSH) VAR Control-Provides
continuous control of holdoff time between sweeps.
This control improves the ability to trigger on aperi
odic signals (such as complex digital waveforms)
and increases the minimum holdoff time to at least
2.5 times at any sweep speed.
B TRIGGER
Refer to Figure 7 for location of items 35 through 41.
(35) LEVEL Control—Selects the amplitude point on the
trigger signal at which the sweep is triggered. This
control is usually adjusted for the desired display
after Trigger SLOPE and SOURCE switch settings
have been selected.
(36) SOURCE Switch—Determines the mode of operation
for the B Sweep and the signal source for the B
Trigger.
A TIME—Provides two intensified zones on the
crt trace for differential time measurements. The
time difference between the two intensified zones
is determined by the B DELAY TIME POSITION
and the A TIME POSITION controls. Time differ-
@ 2337 Operators
ence is displayed on the LCD readout in seconds
(s), milliseconds (ms), or microseconds (ps).
The LCD readout will display UNCAL when the
TIME (PULL) VAR control is out of calibrated
detent. With the HORIZ MODE set to A INTEN,
alternation of the reference intensified zone occurs
at the end of each sweep. With the HORIZ MODE
set to B, the start of the B Sweep alternates
between the setting of the reference intensified
zone and the setting of the measurement inten
sified zone.
RUNS AFTER DLY—The B Sweep starts immedi
ately after the delay time selected by the DELAY
TIME POSITION control and is independent of
the B Trigger signal.
VERT MODE—Allows the internal trigger source
to be determined by the vertical mode of
operation.
CH 1—The signal applied to the CH 1 input con
nector is the source of the trigger signal.
CH 2—The signal applied to the CH 2 input
connector is the source of the trigger signal.
EXT—Permits triggering on signals applied to the
External Trigger Input (B EXT) connector.
15
Figure 7. DMM and B TRIGGER controls, connectors, and LCD readout.
16
2337 Operators
@
(3?) SLOPE Switch—Selects the slope of the signal that
triggers the sweep.
+ (plus)—Sweep is triggered on the positive-going
portion of the trigger signal.
— (minus)—Sweep is triggered on the negative
going portion of the trigger signal.
(38) B EXT Connector—Provides a means of introducing
external signals into the B Trigger Generator.
(39) RANGE/FUNCTION Switch—Selects the function
and the range of values for the DMM when not in the
A TIME mode. The LCD readout will indicate the
function in which the DMM is operating by displaying
AC V, V, or 12.
Each DC, RMS AC, and 12 setting, except the 500V
DC and the 350V RMS AC, consists of two internal
(upper and lower) ranges. The internal ranges are
fully autoranging within the DMM RANGE selected.
See Table 3 for the LCD readout values at which
autoranging will occur for each DMM RANGE
selected.
Table 3
DMM Autoranging
DOWNRANGE UPRANGE
When LCD When LCD
Reads Less Reads More
RANGE
FUNCTION
Than
Than
500 V
DC
NA
NA
200 V
DC 10.0 V
19.99 V
2 V
DC
0.100 V
199.9 mV
350 V
RMS AC
NA
NA
200 V
RMS AC
10.0 V 19.99 V
2 V
RMS AC
0.100 V
199.9 mV
20 M
12
1.00 M12 1.999 M12
200 K
12
1.00 K12
1.999 K12
2 K
12 0.100 K12 199.912
12—Measures resistance from 0 12 to 20 M12 in
three ranges.
RMS AC—Measures true rms value of the input
signal (20 Hz to 20 kHz) from 0 V to 350 V in
three ranges. The LCD readout will display
REV JAN 1982
2337 Operators
17
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