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

Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its subsidiaries
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
Beaverton, OR 97077
USA
For product information, sales, service, and technical 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 Adapter Board.................................................................................. 52
Front-Panel Knob ........................................................................................ 54
Front Case ................................................................................................ 54
Front-Panel Board ....................................................................................... 56
Display Module .......................................................................................... 57
Compact Flash Board.................................................................................... 58
Keypad .................................................................................................... 58
Troubleshooting............................................................................................... 60
Troubleshooting Tree.................................................................................... 61
Lithium-Ion Battery Maintenance .......................................................................... 66
Repackaging Instructions .................................................................................... 69
Diagrams ........................................................................................................... 71
Replaceable 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: Removing and installing the rear case ....... ................................ .................. ...... 48
Figure 4: Modules 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
Figure 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: Time 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: Mechanical 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 Safety Summary
General SafetySummary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it.
To avoid potential 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 safety sections of the other component manuals for warnings and
cautions related to operating the system.
To Avoid Fire or Personal
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
information before making connections to the product.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do not operate without covers. Do not operate this product with covers or panels
removed.
Do not operate with suspected failures. If you suspect that there is damage to this
product, 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 in wet/damp conditions.
Do not operate in an explosive atmosphere.
Keep product surfaces clean and dry.
Provide proper 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 terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read
the marking.
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 Safety Summary
Only qualified 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 protective 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 oscilloscopes to the module level.
Unless noted otherwise, the term "oscilloscope" refers to all of the models in
the TPS2000BSeries.
Products
This manual 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 part number
Programmer manual part
number
English 071-2733-XX
French 071-2734-XX 1
Italian 071-2735-XX 1
German 071-2736-XX 1
Spanish 071-2737-XX 1
Japanese 071-2738-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
1These 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 finger 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 is connected to a voltage source.
Connect the probe output to the oscilloscope before connecting the probe to
the circuit 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.
Signal 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 with 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 VRMS
CAT III 150 VRMS
Maximum Input Voltage (between
Signal and Reference at input
BNC) 1
At front panel connector, 300 VRMS; 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 VRMS 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 must 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 must 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,
Average 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 ms/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, with equal volts/div and coupling
settings on each channel.
Channel-Channel Common Mode
Rejection Ratio, typical
With the same signal applied to each channel, this is the ratio of 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)
1The maximum peak-to-peak voltage that can be displayed is 40 Vp-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 Range
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 VRMS CAT 1 and CAT II
150 VRMS 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 signal 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 Sensitivity, 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, regular 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, PAL, 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 Trigger 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 ns
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