Tektronix P6248 Service Manual
xx
P6248
1.7 GHz (Typical)
ZZZ
Differential Probe
Service Manual
*P071057304*
071-0573-04
xx
P6248
1.7 GHz (Typical)
ZZZ
Differential Probe
Service Manual
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.
www.tektronix.com
071-0573-04
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 p roducts 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.
KlipChip, TwinFoot, TwinTip, and VariTip are trademarks of Tektronix, Inc.
Contacting Tektronix
Tektronix, Inc.
14200 SW Karl Braun Drive
P.O . Bo x 500
Beaverton, OR 97077
USA
For product information, sales, service, and technical support:
In North America, call 1-800-833-9200.
World wide, vi s it www.tektronix.com to find contacts in your area.
Warranty
Tektronix warrants that this product will be free from def ects in materials and workmanship for a period o f one (1)
year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its
option, either will repair the defective product without charge for parts and labor, or will provide a replacement
in exchange for the defective product. Parts, modules and replacement products used by Tektronix for warranty
work may be n
the property of Tektronix.
ew or reconditioned to like new performance. All replaced parts, modules and products become
In order to o
the warranty p eriod and make suitable arrangements for the performance of service. Customer shall be responsible
for packaging and shipping the defective product to the service center designated by Tektronix, with shipping
charges prepaid. Tektronix shall pay for the return of the product to Customer if the shipment is to a location within
the country in which the Tektronix service center is located. Customer shall be responsible for paying all shipping
charges, duties, taxes, and any other charges for products returned to any other locations.
This warranty shall not apply to any defect, failure or damage caused by improper use or improper or inadequate
maintenance and care. Tektronix shall not be obligated to furnish service under this warranty a) to repair damage
result
b) to repair damage resulting from improper use or connection to incompatible equipment; c) to repair any damage
or malfunction caused by the use of non-Tektronix supplies; or d) to service a product that has been modified or
integrated with other products when the effect of such modification or integration increases the time or difficulty
of servicing the product.
THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY
OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY
IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
TRONIX’ RESPONSIBILITY TO REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE
TEK
AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY.
TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL,
OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS
ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
[W2 – 15AUG04]
btain service under this warranty, Customer must notify Tektronix of the defect before the expiration of
ing from attempts by personnel other than Tektronix representatives to install, repair or service the product;
Table of Contents
General Safety Summary ......................................................................................... iii
Service Safety Summary............................ ................................ ............................... v
Preface ............................................................................................................. vii
Related Manuals ........ ................................ ................................ ..................... vii
Specifications .................. ................................ ................................ ..................... 1
Warranted Characteristics..................................................................................... 1
Typical Characteristics ..... ................................ ................................ ................... 2
Nominal Characteristics....................................................................................... 4
Performance Verification ........... ................................ ................................ ............... 5
Equipment Required........................................................................................... 5
Preparation........................................... .................................. ......................... 6
Output Offset Voltage ............ ................................ .................................. ........... 7
DC Attenuation Accuracy .................................................................................... 8
Differential Signal Range ...................... ................................ ............................... 9
Rise Time .......... ................................ .................................. .......................... 11
Common-Mode Rejection Ratio .......... ................................ .................................. 14
TEKPROBE Communication (Operational Check) ...................................................... 17
Adjustment Procedures ........................................................................................... 19
Equipment Required.......................................................................................... 19
Adjustment locations ......................................................................................... 20
Offset (preliminary) .............. .................................. ................................ .......... 21
Gain .. ................................ ................................ .................................. ........ 22
Offset (Final) .................................................................................................. 23
DC CMRR..................................................................................................... 24
AC CMRR..................................................................................................... 26
Maintenance........................................................................................................ 27
Cleaning ....................................................................................................... 27
Replacing TEKPROBE Interface Pins ..................................................................... 27
Removing and Replacing the TEKPROBE Interface Collar....................................... ...... 28
Options........................................ ................................ ................................ ...... 29
Replaceable Parts .................................................................................................. 31
Appendix A: Alternate Verification Procedures................ ................................ ................ 37
Equipment Required.......................................................................................... 37
Preparation........................................... .................................. ........................ 38
CMRR (Common-Mode Rejection Ratio) ....... .................................. ........................ 38
P6248 1.7 GHz Differential Probe Service Manual i
Table of Contents
List of Figure
Figure 1: Typical Common-Mode Rejection Ratio (÷1 and ÷10 attenuation) .... ........................... 3
Figure 2: Ty
Figure 3: Dimensions of probe head and compensation box .................................................. 4
Figure 4: Setup for the output offset voltage test .......... .................................. ................... 7
Figure 5: Setup for differential-mode tests ......... ................................ ............................. 9
Figure 6: Test system rise time setup.............................. ................................ .............. 11
Figure 7: Rise time setup for test system with probe.......................................................... 12
Figure 8:
Figure 9: Adjustment locations ...................... .................................. .......................... 20
Figure 10: Setup for the offset adjustment...................................................................... 21
Figure 11: Setup for gain adjustment............................................................................ 22
Figure 12: Setup for DC CMRR and AC CMRR adjustments ............................................... 24
Figure 13: Replacing TEKPROBE interface pins ............................................................. 27
e 14: Replacing the TEKPROBE collar .................................................................. 28
Figur
Figure 15: P6248 replaceable parts.................... ................................ .......................... 31
Figure 16: P6248 standard accessories.......................... ................................ ................ 32
Figure 17: P6248 optional accessories .................. .................................. ...................... 34
Figure 18: Normalizing the setup................................................................................ 38
Figure 19: Setup for the CMRR tests ........................................................................... 39
pical differential input impedance versus frequency............................................. 3
Setup for CMRR test ...................... ................................ ............................ 15
s
ii P6248 1.7 GHz Differential Probe Service Manual
General Safety Summary
General Safet
To Avoid Fi
re or Personal
Injury
ySummary
Review the fo
this product or any products connected to it.
To avoid pot
Only qualified personnel should perform service procedures.
Connect and Disconnect Properly. Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Ground the Product. This product is indirectly grounded through the grounding
conductor of the mainframe power cord. To avoid electric shock, the grounding
conductor must be connected to earth ground. Before making connections to
the input or output terminals of the product, ensure that the product is properly
grounded.
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
mation before making connections to the product.
infor
Connect the probe reference lead to earth ground only.
llowing safety precautions to avoid injury and prevent damage to
ential hazards, use this product only as specified.
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.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
eep Product Surfaces Clean and Dry.
K
Provide Proper Ventilation. Refer to the manual’s installation instructions for
details on installing the product so it has proper ventilation.
P6248 1.7 GHz Differential Probe Service Manual iii
General Safety Summary
TermsinthisManual
Symbols and Terms on the
Product
These terms may
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.
These terms may appear on the product:
DANGER in
the marking.
WAR NI N G
read the marking.
CAUTIO
The following symbol(s) may appear on the product:
appear in this manual:
dicates an injury hazard immediately accessible as you read
indicates an injury hazard not immediately accessible as you
N indicates a hazard to property including the product.
iv P6248 1.7 GHz Differential Probe Service Manual
Service Safety Summary
Service Safet
y Summary
Only qualifie
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
disconnect test leads before removing protective panels, soldering, or replacing
components.
To avoid electric shock, do not touch exposed connections.
d personnel should perform service procedures. Read this Service
this product. Disconnect power, remove battery (if applicable), and
P6248 1.7 GHz Differential Probe Service Manual v
Service Safety Summary
vi P6248 1.7 GHz Differential Probe Service Manual
Preface
Related Manuals
This manual contains specifications and service information for the
P6248 differential probe.
For operating information, refer to the P6248 Instructions (071-0566-XX).
P6248 1.7 GHz Differential Probe Service Manual vii
Preface
viii P6248 1.7 GHz Differential Probe Service Manual
Specifications
The speci fi cations in the following tables apply to a P6248 differential probe
installed on a Tektronix TDS694C oscilloscope. When the probe is used with
another osci
lloscope, the oscilloscope must have an input impedance of 50 Ω.The
probe must have a warm-up period of at least 20 minutes and be in an environment
that does not exceed the limits described in the environmental specifications
table. Specifications for the P6248 differential probe fall into three categories:
warranted, typical, and nominal characteristics.
Warrante
d C haracteristics
Warranted characteristics describe guaranteed performance within tolerance limits
or certain type-tested requirements. (See Table 1.) Warranted characteristics
that hav
symbol.
Table 1: Warranted electrical characteristics
Characteristic Description
accuracy
Maximum
nondestructive
input voltage
rang
Comm
range (DC coupled)
voltage
Rise time (probe only)
rejection ratio
Bandwidth (probe only) DC to ≥1.5 G Hz (-3dB)
echecksinthePerformance Verification section are marked with the
DC attenuation
Differential signal
e (DC coupled)
on-mode signal
Output offset
mon-mode
Com
±2% for input voltages ±750 mV (÷1) and ±7.5 V (÷10)
r input voltages ±850 mV (÷1) and ±8.5 V (÷10)
±5% fo
±25 V
(DC + peak AC)
±8.5 V at attenuation setting of ÷10
±850 mV at attenuation setting of ÷1
±7 V
±10mV(+20to+30ºC,+68to+86ºF)
±50 mV (0 to +50 ºC, +32 to +122 ºF)
<265 ps
45 dB at 1 MHz in ÷10
25 dB at 100 MHz in ÷10
20 dB at 500 MHz in ÷10
18 dB at 1 GHz in ÷10
60 dB at 1 MHz in ÷1
38 dB at 100 MHz in ÷1
35 dB at 500 MHz in ÷1
30 dB at 1 GHz in ÷1
between signal and common of the same channel
P6248 1.7 GHz Differential Probe Service Manual 1
Specifications
Typical Characteristics
Table 1: Warranted electrical characteristics (cont.)
Characteristic Description
Temperature
Humidity
Operating: 0 to +50 ºC (+32 to +86 ºF),
1
0 to +60 ºC (+32 to +122 ºF)
Nonoperating: -55 to +75 ºC (-131 to +167 ºF)
(probe head)
1
Operating: 0-90% RH, tested at +30 to +50 ºC (+68 to +122 ºF)
Nonoperating: 0-90% RH, tested at +30 to +60 ºC (+68 to +140 ºF)
1
See warning that follows.
WARNING. To avoid a burn hazard at high ambient temperatures, do not touch
the probe with bare hands at operating temperatures above +50 °C (+122 °F)
or at nonoperating temperatures above +70 °C (+158 °F). Allow sufficient time
for the p
robe to cool before handling.
Typical characteristics describe typical but not guaranteed performance. (See
Table 2.)
Table 2: Typical electrical characteristics
acteristic
Char
ferential input
Dif
resistance,
DC coupled
Common-mode input
sistance, DC coupled
re
fferential input
Di
capacitance
Common-mode input
capacitance
Harmonic distortion
Differential offset range ±700 mV (÷1 range), ±7 V (÷10 range)
Common mode
rejection ratio
Random noise
Input impedance
Pass band ripple
Bandwidth (probe only) DC to ≥1.7 GHz (- 3dB) @ ≤27 ºC (÷1 range)
Rise time (probe and
oscilloscope)
ription
Desc
kΩ ±2%
200
100 kΩ ±2%
<1 pF at 1 MHz
2pFat1MHz
<
≤1.5% measured using 354 mV
RMS
(or 1.0 V
(See Figure 1 on page 3.)
<50 nV/ √Hz @100 MHz
(See Figure 2 on page 3.)
≤ ±0.5 dB to 850 MHz (deviation from a nominal slope)
DC to ≥1.85 GHz (- 3dB) @ ≤27 ºC (÷10 range)
<265 ps
) output at 100 MHz
P-P
2 P6248 1.7 GHz Differential Probe Service Manual
Specifications
Figure 1: Typical Common-Mode Rejection Ratio (÷1 and ÷10 a ttenuation)
Figure 2: Typical differential input impedance versus frequency
P6248 1.7 GHz Differential Probe Service Manual 3
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