Tektronix TPS2000B Series User manual

xx

TPS2000B Series

Digital Storage Oscilloscopes

ZZZ

Service Manual

*P077044701*

077-0447-01

TPS2000B Series

Digital Storage Oscilloscopes

ZZZ

Service Manual

xx

This document supports ﬁrmware version 1.00 and above.

Warning

The servicing instructions are for use by qualiﬁed personnel

only. To avoid personal injury, do not perform any servicing

unless you are qualiﬁed to do so. Refer to all safety summaries

prior to performing service.

Revision A

www.tektronix.com

077-0447-01

or suppliers, and are protected by national copyright laws and international treaty provisions.

Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication

supersedes that in all previously published material. Speciﬁcations and price change privileges reserved.

TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.

Contacting Tektronix

Tektronix, Inc.

14150 SW Karl Braun Drive

P.O. Box 500

Beaverto

n, OR 97077

USA

For product information, sales, service, and te chnical support:

In North America, call 1-800-833-9200.

Worldwide, visit www.tektronix.com to ﬁnd contacts in your area.

Table of Contents

General Safety Summary .......................................................................................... v

Service Safety Summary......................................................................................... vii

Preface .............................................................................................................. ix

Products........................................................................................................ ix

Related Manuals .............................................................................................. ix

Probe Safety .................................................................................................... x

Speciﬁcations ....................................................................................................... 1

Signal Acquisition System......... ........................ ........................ ........................ ... 1

Time Base System ............................................................................................. 3

Triggering System ............................................................................................. 4

Display.......................................................................................................... 7

Batteries......................................................................................................... 7

External DC Input ............................................................................................. 8

External Interfaces............................................................................................. 8

Mechanical Characteristics ................................................................................... 9

Environmental Performance.................................................................................. 9

Operating Information ............................................................................................ 11

Theory of Operation............................................................................................... 13

Acquisition Board ............................................................................................ 14

Power Supply and Battery System.......................................................................... 16

Display Module ............................................................................................... 16

Front Panel .................................................................................................... 16

Performance Veriﬁcation ......................................................................................... 19

Required Equipment.......................................................................................... 19

Test Record .................................................................................................... 20

Self Test................................................................................................... 23

Self Calibration........................................................................................... 23

Check DC Gain Accuracy............................................................................... 24

Check DC Measurement Accuracy .................................................................... 25

Check Bandwidth ........................................................................................ 27

Check Sample Rate and Delay Time Accuracy....................................................... 28

Check Edge Trigger Sensitivity ................ .................. ...................................... 29

Check External Edge Trigger Sensitivity................ ................................ .............. 30

Adjustment Procedures ........................................................................................... 33

Required Equipment.......................................................................................... 33

Adjustment Procedure........................................................................................ 34

Maintenance........................................................................................................ 41

Preparation..................................................................................................... 41

Preventing ESD ............................................................................................... 41

TPS2000B Series Digital Storage Oscilloscopes Service Manual i

Table of Contents

Inspection and

Cleaning...................................................................................... 42

Removal and Installation Procedures....................................................................... 45

Rear Case ................................................................................................. 47

Fan......................................................................................................... 49

I/O Board ................................................................................................. 50

Acquisition Board...... .......... .......................... .......................... .......... .......... 51

Display Ada

pter Board .................................................................................. 52

Front-Panel Knob ........................................................................................ 54

Front Case ................................................................................................ 54

Front-Panel Board ....................................................................................... 56

Display Module .......................................................................................... 57

Compact Flash Board.................................................................................... 58

Keypad .................................................................................................... 5

8

Troubleshooting............................................................................................... 60

Troubleshooting Tree.................................................................................... 61

Lithium-Ion Battery Maintenance .......................................................................... 66

Repackaging Instructions .................................................................................... 69

Diagrams ........................................................................................................... 71

Repl

aceable Parts .................................................................................................. 73

Parts Ordering Information .................................................................................. 73

Using the Replaceable Parts List............................................................................ 74

ii TPS2000B Series Digital Storage Oscilloscopes Service Manual

List of Figures

Figure 1: TPS2000B Series module-level block diagram. Remove CH3 and CH4 for a 2-channel

version ......................................................................................................... 13

Figure 2: Adjustment setups ..................................................................................... 35

Figure 3: Re

moving and installing the rear case ............. ................................ .................. 48

Figure 4: M odules accessed from the rear of the oscilloscope ............. .............. .............. ...... 50

Figure 5: Using a screwdriver to remove the Acquisition board ... ...................... .................... 52

Figure 6: Removing the BNC cover, shell, and retaining nuts ............................................... 54

Figure 7: Removing the front case .............................................................................. 55

Figure 8: Removing the Front-Panel module................................................................... 56

Figure 9

: Removing the Display module ....................................................................... 57

Figure 10: Removing and installing the keypad ............................................................... 59

Figure 11: Oscilloscope troubleshooting tree (page 1 of 4)....................... ............................ 61

Figure 12: Oscilloscope troubleshooting tree (page 2 of 4)................................................... 62

Figure 13: Oscilloscope troubleshooting tree (page 3 of 4)................................................... 63

Figure 14: Oscilloscope troubleshooting tree (page 4 of 4)................................................... 64

Figu

re 15: TPS2000B Series block diagram ................................................................... 71

Figure 16: Exploded view diagram.............................................................................. 78

TPS2000B Series Digital Storage Oscilloscopes Service Manual iii

Table of Contents

List of Tables

Table 1 : Signal acquisition system ...................... .................. .................. ..................... 1

Table 2: Tim

e base system ........................................................................................ 3

Table 3: Triggering system ........................................................................................ 4

Table 4: Display .................................................................................................... 7

Table 5: Batteries ................................................................................................... 7

Table 6: External DC input........................................................................................ 8

Table 7: External interfaces ....................................................................................... 8

Table 8: M

echanical characteristics .............................................................................. 9

Table 9: Environmental performance ............................................................................ 9

Table 10: Required equipment ................................................................................... 19

Table 11: Test record.............................................................................................. 20

Table 12: Required equipment ................................................................................... 33

Table 13: Adjustments (steps 73-108 are for 4-CH models only)............................................ 37

Table

14: Internal inspection checklist.......................................................................... 43

Table 15: List of error codes ..................................................................................... 65

Table 16: Parts list column descriptions ........................................................................ 74

Table 17: Replaceable parts list.................................................................................. 75

iv TPS2000B Series Digital Storage Oscilloscopes Service Manual

General S afety Summary

General Safet

ySummary

Review the fo

llowing safety precautions to avoid injury and prevent damage to

this product or any products connected to it.

To avoid pot

ential hazards, use this product only as speciﬁed.

Only qualiﬁed personnel should perform service procedures.

While using this product, you may need to access other parts of a larger system.

Read the s afety sections of the other component manuals for warnings and

cautions r

elated to operating the system.

To Avoid Fire or Persona l

Injury

Use proper power cord. Use only the power cord speciﬁed for this product and

certiﬁed for the country of use.

Connect and disconnect properly. Do not connect or disconnect probes or test

leads while they are connected to a voltage source.

Connect and disconnect properly. Connect the probe output to the measurement

instrument before connecting the probe to the circuit under test. Connect the

probe reference lead to the circuit under test before connecting the probe input.

Disconnect the probe input and the probe reference lead from the circuit under test

before disconnecting the probe from the measurement instrument.

Observe all terminal ratings. To avoid ﬁre or shock hazard, observe all ratings

and markings on the product. Consult the product manual for further ratings

inf

ormation before making connections to the p roduct.

Do not apply a potential to any terminal, including the common terminal, that

ex

ceeds the maximum rating of that terminal.

Do not operate without covers. Do not operate this product with covers or panels

re

moved.

Do not operate with suspected failures. If you suspect that there is damage to this

p

roduct, have it inspected by qualiﬁed service personnel.

Avoid exposed circuitry. Do not touch exposed connections and components when

power is present.

Replace batteries properly. Replace batteries only with the speciﬁed type and

rating.

Recharge batteries properly. Recharge batteries for the recommended charge cycle

only.

Use proper AC adapter. Use only the AC adapter speciﬁed for this product.

Wear eye protection. Wear eye protection if exposure to high-intensity rays or

laser radiation exists.

TPS2000B Series Digital Storage Oscilloscopes Service Manual v

General Safety Summary

Do not operate i

n wet/damp conditions.

Do not operate in an explosive atmosphere.

Keep product surfaces clean and dry.

Provide prop

er ventilation. Refer to the manual's installation instructions for details

on installing the product so it has proper ventilation.

TermsinThisManual

These terms may appear in this manual:

WARNING.

Warning statements identify conditions or practices that could result

in injury or loss of life.

CAUTION

. Caution statements identify conditions or practices that could result in

damage to this product or other property.

Symbols and Terms on the

Product

These t

erms may appear on the product:

DANGER indicates an injury hazard immediately accessible as you rea d

the ma

rking.

WARNING indicates an injury hazard not immediately accessible as you

read

the marking.

CAUTION indicates a hazard to property including the product.

The following symbol(s) may appear on the product:

vi TPS2000B Series Digital Storage Oscilloscopes Service Manual

Service Safety Summary

Service Safet

y Summary

Only qualiﬁe

d personnel should perform service procedures. Read this Service

Safety Summary and the General Safety Summary before performing any service

procedures.

Do Not Service Alone. Do not perform internal service or adjustments of this

product unless another person capable of rendering ﬁrst aid and resuscitation is

present.

Disconnect Power. To avoid electric shock, switch off the instrument power, then

disconnect the power cord from the mains power.

UseCareWhenServicingWithPowerOn. Dangerousvoltagesorcurrentsmay

exist in

this product. Disconnect power, remove battery (if applicable), and

disconnect test leads before removing p rote ctive panels, soldering, or replacing

components.

To avoid electric shock, do not touch exposed connections.

TPS2000B Series Digital Storage Oscilloscopes Service Manual vii

Service Safety Summary

viii TPS2000B Series Digital Storage Oscilloscopes Service Manual

Preface

This service manual for the TPS2000B Series Digital Storage Oscilloscopes

provides instructions to verify the performance of, calibrate, troubleshoot, and

repair the os

cilloscopes to the module level.

Unless noted otherwise, the term "oscilloscope" refers to all of the models in

the TPS2000

BSeries.

Products

This manu

al covers the following products:

TPS2012B Digital Storage Oscilloscope

TPS2014B Digital Storage Oscilloscope

TPS2024B Digital Storage Oscilloscope

Related Manuals

These manuals contain additional documentation for the oscilloscopes. They are

available at www.tektronix.com/manuals.

Language User manual p art number

Progr

ammer manual part

number

Engl

ish

071-

2733-XX

French 071-2734-XX

1

Italian 071-2735-XX

1

German

071

-2736-XX

1

Spanish

071

-2737-XX

1

Ja

panese

07

1-2738-XX

1

Portuguese 071-2739-XX

1

Simpliﬁed Chinese

071-2740-XX

1

Traditional Chinese

071-2741-XX

1

Korean 071-1450-XX

1

Russian 071-2743-XX

1

077-

0444-XX

1

These manuals contain a language overlay for the front-panel controls.

TPS2000B Series Digital Storage Oscilloscopes Service Manual ix

Preface

Probe Safety

A guard around the probe body provides a ﬁ nger barrier for protection from

electric shock.

WARNING. To avoid electric shock when using the probe, keep ﬁngers behind the

guard on the probe body, and do not touch metallic portions of the probe head

while it i

s connected to a voltage source.

Connect the probe output to the oscilloscope before connecting the probe to

the cir

cuit under test. Disconnect the probe input and the probe reference lead

from the circuit under test before disconnecting the probe from the measurement

instrument.

x TPS2000B Series Digital Storage Oscilloscopes Service Manual

Speciﬁcations

These speciﬁcations apply to all TPS2000B Series oscilloscopes. To verify that an

oscilloscope meets speciﬁcations, it must ﬁrst meet the following conditions:

The oscilloscope must have been operating continuously for twenty minutes

within the speciﬁed operating temperature range. (See Table 9.)

You must perform the Do Self Cal operation, accessible through the Utility

menu, if the operating temperature changes by more than 5 °C.

The oscilloscope must be within the factory calibration interval of one year.

The V/div speciﬁcations apply with the probe calibration set to 1X probe

mode.

Speciﬁcations begin in the following table. All speciﬁcations are guaranteed

unless noted "typical." Speciﬁcations that are marked with the

symbol are

checked in the Performance Veriﬁcation section.

S

ignal Acquisition System

Table 1: Signal acquisition system

Characteristic Description

Number of Input Channels Two (TPS2012B) or four (TPS2014B, TPS2024B) identical channels, digitized simultaneously

Input Coupling DC, AC, or GND

AC coupling connects a capacitor in series with the input circuitry. The DC input impedance

becomes very high, since capacitance is in series w ith all paths to ground.

Ground coupling mode provides a reference waveform derived from the values identiﬁed during

SPC. This reference waveform shows visually where signal reference (ground) is expected

to be.

Input Impedance, DC Coupled 1 MΩ ±2%inparallelwith20pF±3pF

Overvoltage Category

Maximum Voltage

CAT I and CAT II

300 V

RMS

CAT III

150 V

RMS

Maximum Input Voltage (between

Signal and Reference at input

BNC)

1

At front panel connector, 300 V

RMS

; derate at 20 dB/decade above 100 kHz to 13 V peak

AC at 3 MHz and above.

All inputs are rated 300 V CAT II, signal to ﬂoating common.

Derate at 20 dB/decade above 100 kHz to 13 V peak AC at 3 MHz and above. For

nonsinusoidal waveforms, peak value must be less than 450 V. Excursion above 300 V should

be less than 100 ms duration. RMS signal level, including any DC component removed through

AC coupling, must be limited to 300 V. If these values are exceeded, damage to the oscilloscope

may result. Refer to the Overvoltage Category description. (See Table 9 on page 9.)

Maximum Float Voltage

Rated 600 V

RMS

CAT II.

Between instrument common (chassis) and BNC shell. Using rated connectors or accessories.

Number of Digitized Bits 8-bit resolution (except when set to 2 mV/div), each channel sampled simultaneously.

TPS2000B Series Digital Storage Oscilloscopes Service Manual 1

Speciﬁcations

Table 1: Signal acquisition system (cont.)

Characteristic Description

Supported Voltage Probe

Attenuation Factors

1X, 10X, 20X, 50X, 100X, 500X, 1000X

This adjusts the display scale factor of the instrument to accommodate various probe types.

Accuracy of the probe used must be added to the accuracy speciﬁcations of instrument.

The Tektronix probe Interface is not provided, so the user m ust adjust the setting to match

the probe characteristics.

Supported Current Probe Scales 1 mV/mA, 5 mV/mA, 1 mV/A, 10 mV/A, 20 mV/A, 50 mV/A, 100 mV/A, 200 mV/A

This adjusts the display scale factor of the instrument to accommodate various probe types.

Accuracy of the probe used must be added to the accuracy speciﬁcations of instrument.

The Tektronix probe Interface is not provided, so the user m ust adjust the setting to match

the probe characteristics.

Acquisition Modes

Sample, Peak Detect, and Average

Envelope mode not provided

±3% for Sample or Average acquisition mode, 5 V/div to 10 mV/div

DC Gain Accuracy

±4% for Sample or Average acquisition mode, 5 mV/div and 2 mV/div

Measurement Type Accuracy

Average of ≥16 waveforms with

vertical position at zero

±(3% × |reading| + 0.1 div + 1 mV)

Average of ≥16 waveforms with

vertical position not at zero for 2 mV

to 200 mV/div.

±[3% × (|reading + vertical position|) + 1 % of |vertical

position| + 0.2 div + 2 mV]

DC Measurement Accuracy,

Avera

ge Acquisition Mode

Average of ≥ 16 waveforms with

vertical position not at zero for >200

mVto5V/div.

±[3% × |reading + vertical position| + 1% of |vertical

position| + 0.2 div + 50mV]

Change in measured volts between any two averages of ≥ 16 waveforms acquired under the

same setup and ambient conditions.

DC Voltage Measurement

Repeatability, Average Acquisition

Mode

(3% of |reading| + 0.05 div)

Analog Bandwidth

Deﬁned in Section 4.6 of IEEE std 1057. The difference between the upper and lower

frequencies, at which the amplitude response, as seen in the data record, is 0.707 (-3 dB) of

the response seen in the data record at the speciﬁed reference frequency. Speciﬁed only –3 dB

point, does not include in-band response.

TPS2012B and TPS2014B TPS2024B

Analog Bandwidth in Sample

and Average modes at BNC or with

probe set to 10X, DC Coupled,

typical

DC to 100 MHz for all V/div settings

with bandwidth limit at full.

DC to 200 MHz for all V/div settings 5 mV and above,

for operating temperatures from 0°C to 40 °C.

DC to 180 MHz for all V/div settings 5 mV/div and

above, for operating temperatures from 40 °C to

50 °C

Analog Bandwidth in Peak Detect

mode (50 s/div to 5 m s/div), DC

coupled, typical

DC to ≥75 MHz for all V/div settings with bandwidth limit at full.

Lower Frequency Limit, AC

Coupled

≤10 Hz at BNC

≤1 Hz when using a 10X passive probe

2 TPS2000B Series Digital Storage Oscilloscopes Service Manual

Speciﬁcations

Table 1: Signal acquisition system (cont.)

Characteristic Description

TPS2012B and TPS2014B TPS2024B

<3.5ns <2.1ns

Rise Time at BNC, typical

Rise time is generally calculated from the following formula: Rise time in ns = 350 / Bandwidth

in MHz

Peak Detect Response

Captures 50% or greater amplitude of pulses ≥12 ns wide typical (50 s/div to 5 μs/div) in the

center 8 vertical divisions

Vertical Position Range

2 mV/div to 200 mV/div, ±1.8 V

>200 mV/div to 5 V/div, ± 45 V

Vertical Position Accuracy

2 mV/div to 200 mV/div, ±(1% × selected value +0.1 div + 2 mV) within the range ±1.8 V

>200 mV/div to 5 V/div, ±(1% × selected value + 0.1 div + 50 mV) within the range ±45 V

Greater than 1000:1 up to 50 MHz, derated to 400:1 at 200 MHzSingle Channel Common Mode

Rejection, typical

Sine wave with VOLTS/DIV setting at 5 mV. Signal applied between the channel (signal and

signal reference) and chassis. Ratio of the acquired signal amplitude to the amplitude of

the signal.

100:1 at 60 Hz, reducing to 10:1 with 50 MHz sine wave, w ith equal volts/div and coupling

settings on each channel.

Channel-Channel Common Mode

Rejection Ratio, typ ical

With the same signal applied to each channel, this is the ratio o f the acquired signal amplitude

to the amplitude of the MATH difference waveform, CH1–CH2, CH2–CH1, CH3–CH4, or

CH4–CH3.

TPS2012B and TPS2014B TPS2024B

50 MHz:≥100:1 100 MHz:≥100:1

Channel-to-Channel Crosstalk

Measured on one channel, with test signal applied between signal and common of the other

channel, and with the same VOLTS/DIV and coupling settings on each channel.

Waveform acquisition Rate, typical Up to 180 waveforms per second, per channel (Sample acquisition mode, no measurements)

1

The maximum peak-to-peak voltage that can be displayed is 40 V

p-p

with 1x attenuation.

Time Base System

Table 2: Time base system

Characteristic Description

TPS2012B and TPS2014B TPS2024BSample Rate Range

5S/sto1GS/s 5S/sto2GS/s

Waveform Interpolation (sin x)/x

Waveform interpolation is activated for sweep speeds of 100 ns/div and faster.

Record Length

2500 samples for each channel

TPS2012B and TPS2014B TPS2024BSeconds/Division R ange

5 ns/div to 50 s/div, in a 1, 2.5, 5 sequence 2.5 ns/div to 50 s/div, in a 1, 2.5, 5 sequence

Sample Rate and Delay Time

Accuracy

±50 ppm over any ≥1mstimeinterval

TPS2000B Series Digital Storage Oscilloscopes Service Manual 3

Speciﬁcations

Table2: Timebasesystem(cont.)

Characteristic Description

2.5ns/divto10ns/div:(-4div×s/div)to20ms

25 ns/div to 100 ms/div: (-4 div × s/div) to 50 ms

250 μs/div to 10 s/div: (-4 div × s/div) to 50 s

Position Range

25 s/div to 50 s/div: (-4 div× s/div) to 250 s

Conditions

Accuracy

Single-shot, sample mode ±(1 sample interval + 100 ppm × |reading|

+0.6ns)

>16 averages

±(1 sample interval + 100 ppm × |reading|

+0.4ns)

Delta Time Measurement Accuracy

(Full Bandwidth)

The limits apply for signals having amplitude > 5 divisions, slew rate at the measurement

points of > 2.0 divisions/ns, and acquired > 10 mV/Div.

Sample interval is the time between the samples in the waveform record.

Triggering System

Table 3: Triggering system

Characteristic Description

Holdoff Range

500 ns to 10 s

The ability to set large values of Holdoff is limited by the difﬁculty in adjusting the Holdoff

at Sec/Div settings less than 100 ms/div. This is because Holdoff cannot be set in Scan

Mode, which begins at 100 ms/div when Trigger Mode is AUTO. By adjusting Trigger Mode

to NORMAL, the Scan Mode operation is turned off, and Holdoff can be adjusted at larger

Sec/Div settings.

External Trigger Input Impedance

1M±2%inparallelwith20pF±3pF

External Trigger Maximum Input

Voltage

300 V

RMS

CAT 1 and CAT II

150 V

RMS

CAT III

At front panel connector, signal input to BNC shell, 300 V

RMS

; derate at 20 dB/decade above

100 kHz to 13 V peak AC at 3 MHz and above.

Based upon sinusoidal or DC input signal. For nonsinusoidal waveforms, peak value must be

less than 420 V. Excursion above 300 V should be less than 100 ms duration. RMS s ignal level

must be limited to 300 V. If these values are exceeded, damage to the instrument may result.

Input is rated 300 V CAT II, signal to ﬂoating common.

External Trigger Maximum Float

Voltage

Rated 600 V CAT II.

Instrument chassis is normally considered to be at earth ground.

Between instrument chassis and BNC shell

4 TPS2000B Series Digital Storage Oscilloscopes Service Manual

Speciﬁcations

Table 3: Triggering system (cont.)

Characteristic Description

Trigger Source Sensitivity

All products

1 div from DC to 10 MHz

TSP2012B

TPS2014B

1.5 div from 10 MHz to 100 MHz

TSP2024B 1.5 div from 10 MHz to 100 MHz

2 div from 100 MHz to 200 MHz

EXT

1V

p-p

from 50 Hz to 100 MHz

2V

p-p

from 100 MHz to 200 MHz

EXT/5 5X the value of EXT

EXT/10 10X the value of EXT

Trigger Sens

itivity, Edge Trigger

Type. DC Coupled

The minimum signal levels required for stable edge triggering of an acquisition when the trigger

Source is DC coupled. A stable trigger is one that results in a uniform, r egular visual display,

triggered on the selected slope. The trigger point must not switch between opposite slopes on

the waveform, and the display must not “roll” across the screen on successive acquisitions.

Trigger Frequency Readout typically stabilizes at 25% more signal than generates a stable

visual display. At 5 mV/div, 50% additional signal is typically required.

Coupling Sensitivity

AC Same as DC-coupled limits from 50 Hz and above

NOISE REJ Reduces the DC-coupled trigger sensitivity by 2 times for greater

than 10 mv/div to 5 V/div

HF REJ

Same as the DC-coupled limit from DC to 7 kHz, attenuates signals

above 80 kHz

Trigger Sensitivity, Edge Trigger

Type, typical

LF REJ

Same as the DC-coupled limits for frequencies above 300 kHz,

attenuates signals below 300 kHz

SET LEVEL TO 50%, typical Operates with input signals equal to or greater than 50 Hz

Using a 10 M probe will not affect the operation of this function.

Source

Range

CH1, CH2, CH3

2

,

CH4

2

±8 divisions from center of screen

EXT ±4 V

EXT/5

±20 V

EXT/10

±35 V

Trigger Level Range

The adjustable resolution for Trigger Level is 0.02 division for Ch1 or Ch2 source, (and Ch3,

Ch4 for the TPS2014B, TPS2024B)

20 mV for Ext source

100 mV for Ext/5 source

200 mV for Ext/10 source

TPS2000B Series Digital Storage Oscilloscopes Service Manual 5

Speciﬁcations

Table 3: Triggering system (cont.)

Characteristic Description

Accuracies are for signals having rise and fall times ≥20 ns

Source

Accuracy

Internal

±(0.2div+5mV)within±4divisions from center screen having rise

and fall times of >20 ns.

EXT

±(6% of setting + 250 mV) for signals less than ±2 V

EXT/5 ±(6% of setting + 500 mV) for signals less than ±10 V

EXT/10 ±(6% of setting + 1 V) for signals less than ±20 V

Trigger Level Accuracy, typical

A sine wave with 20 ns rise time corresponds to about 18 MHz.

Default Settings, Video Trigger Coupling is AC and Auto except for a single sequence acquisition

Signal Formats and Field Rates,

Video Trigger Type

Supports NTSC, PA L, and SECAM broadcast systems for any ﬁeld or any line

Composite video signal

Source

Range

Internal

Peak-to-peak amplitude of 2 div

EXT

1 V of composite video

EXT/5 5 V of composite video

EXT/10 10 V of composite video

Sensitivity, Video Trigger Type,

typical

A 2 division composite video signal will have a 0.6 division sync tip.

Pulse Width Trigger

Pulse Width Tr igger modes

Trigger when < (Less than), > (Greater than), = (Equal), or ≠ (Not Equal)

Positive pulse or Negative pulse

Pulse Width Trigger Point

Equal: The oscilloscope triggers when the trailing edge of the pulse crosses the trigger level.

Not Equal: If the pulse is narrower than the speciﬁed width, the trigger point is the trailing

edge. Otherwise, the oscilloscope triggers when a pulse continues longer than the time

speciﬁed as the Pulse Width.

Less than: The trigger point is the trailing edge.

Greater than (also called time-out trigger): The oscilloscope triggers when a pulse continues

longer than the time speciﬁed as the Pulse Width.

Pulse Width Range

Selectable from 33 ns to 10 s

Pulse Width Resolution 16.5 ns or 1 part per thousand, whichever is larger

Equal Guard Band t > 330 ns: ±5% ≤ guard band < ± (5.1% + 16.5 ns)

t ≤ 330 ns: guard band = ±16.5 ns

Not Equal Guard Band t > 330 ns: ±5% ≤ guard band < ±(5.1% + 16.5 ns)

165 ns < t ≤ 330 ns: guard band = -16.5 ns ±33 ns

t ≤165 ns: guard band = ±16.5 n s

Trigger Frequency Counter

Readout Resolution 6 digits

Accuracy, typical

±51 ppm including all frequency reference errors and ±1 count errors

6 TPS2000B Series Digital Storage Oscilloscopes Service Manual

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