Service Manual
P6246 400 MHz & P6247 1 GHz
Differential Probes
070-9899-03
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.
*P070989903*
070989903
Copyright © Tektronix, Inc. All rights reserved.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes
that in all previously published material. Specifications and price change privileges reserved.
Tektronix, Inc., 14200 SW Karl Braun Drive, Beaverton, OR 97077
TEKTRONIX and TEK are registered tradem arks of Tektronix, Inc.
WARRANTY
Tektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship
for a period of one (1) year from the date of shipment. If a product proves defective during this warranty period, Tektronix,
at its option, either will repair the defective produc t without charge for parts and labor, or will provide a replacement in
exchange for the defective product.
In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the
warranty period 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 locat ion within the c ountry 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 resulting
from attempts by personnel other than Tektronix representative s to install, re pair or service the product; 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 W ARRANTY IS GIVEN BY TEKTRONIX 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. TEKTRONIX’ RESPONSIBILITY TO
REPAIR OR REPLACE DEFECTIVE PRODUCTS IS THE SOLE 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.
Table of Contents
General Safety Summary iii...................................
Preface v...................................................
Related Manuals v.................................................
Contacting Tektronix v.............................................
Specifications 1.............................................
Warranted Characteristics 1..........................................
Typical Characteristics 2............................................
Nominal Characteristics 4...........................................
Performance V erification 5...................................
Equipment Required 5..............................................
Preparation 6.....................................................
Output Offset Voltage 7.............................................
DC Attenuation Accuracy 8.........................................
Differential Signal Range 9..........................................
Analog Bandwidth 11...............................................
Common Mode Rejection Ratio 13.....................................
TekProbe Communication (operational check) 14.........................
Adjustment Procedures 17.....................................
Equipment Required 17..............................................
Offset (preliminary) 18..............................................
Gain 20...........................................................
Offset (Final) 21...................................................
DC CMRR 21.....................................................
AC CMRR 23.....................................................
Maintenance 25..............................................
Cleaning 25.......................................................
Replacing TekProbe Interface Pins 25..................................
Removing and Replacing the TekProbe Interface Collar 26.................
Options 27..................................................
Replaceable Parts 29..........................................
Appendix A: Alternate Verification Procedures 37.................
Equipment Required 37..............................................
Preparation 38.....................................................
Analog Bandwidth 39...............................................
CMRR (Common Mode Rejection Ratio) 41.............................
P6246 & P6247 Service Manual
i
Table of Contents
List of Figures
Figure 1: Typical Common-Mode Rejection Ratio
(÷ 1and÷ 10 attenuation) 3..............................
Figure 2: Typical input impedance versus frequency 4............
Figure 3: Setup for the output offset voltage test 7................
Figure 4: Setup for differential- mode tests 9.....................
Figure 5: Set up for analog bandwidth test and CMRR 12..........
Figure 6: Adjustment locations 18...............................
Figure 7: Setup for the offset adjustment 19......................
Figure 8: Setup for gain adjustment 20..........................
Figure 9: Setup for DC CMRR and AC CMRR adjustments 22......
Figure 10: Replacing TekProbe interface pins 25..................
Figure 11: Replacing the T ekProbe collar 26......................
Figure 12: P6246 and P6247 replaceable parts 29..................
Figure 13: P6246 and P6247 standard accessories 32...............
Figure 14: P6246 and P6247 optional accessories 34................
Figure 15: Normalizing the setup 39.............................
Figure 16: Setup for the analog bandwidth and CMRR tests 40......
ii
P6246 & P6247 Service Manual
General Safety Summary
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.
ToAvoidFireor
Personal Injury
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
information before making connections to the product.
The common terminal is at ground potential. Do not connect the common
terminal to elevated voltages.
Do not apply a potential to any terminal, including the common terminal, that
exceeds the maximum rating of that terminal.
Do Not Operate With Suspected Failures. If you suspect there is damage to this
product, have it inspected by qualified service personnel.
Do Not Operate in Wet/Damp Conditions.
Do Not Operate in an Explosive Atmosphere.
Keep Product Surfaces Clean and Dry.
P6246 & P6247 Service Manual
iii
General Safety Summary
Symbols and Terms
Terms in this Manual. 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.
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.
Symbols on the Product. The following symbols may appear on the product:
WARNING
High Voltage
Protective Ground
(Earth) Terminal
CAUTION
Refer to Manual
Double
Insulated
iv
P6246 & P6247 Service Manual
Preface
Related Manuals
Contacting Tektronix
This manual contains specifications and service information for the P6246 and
P6247 differential probes.
For operating information, refer to the P6246 & P6247 Instructions
(070-9898-XX).
Product
Support
Service
Support
For other
information
To write us
Website
For questions about using Tektronix measurement products, call
toll free in North America:
1-800-TEK-WIDE (1-800-835-9433 ext. 2400)
6:00 a.m. -- 5:00 p.m. Pacific time
Or contact us by e-mail:
tm_app_supp@tek.com
For product support outside of North America, contact your
local Tektronix distributor or sales office.
Tektronix offers extended warranty and calibration programs as
options on many products. Contact your local Tektronix
distributor or sales office.
For a listing of worldwide service centers, visit our web site.
In North America:
1-800-TEK-WIDE (1-800-835-9433)
An operator will direct your call.
Tektronix, Inc.
14200 SW Karl Braun Drive
Beaverton, OR 97077
USA
Tektronix.com
P6246 & P6247 Service Manual
v
Preface
vi
P6246 & P6247 Service Manual
Specifications
j
20dBat500MHzi
1
0
18dBat1GHzi
n÷1
0
38dBat100MHzi
1
35dBat500MHzi
n÷1
The specifications in Tables 1 through 4 apply to a P6246 or P6247 differential
probe installed on a Tektronix TDS 784A oscilloscope. When the probe is used
with another oscilloscope, the oscilloscope must have an input impedance of
50 Ω and a bandwidth of 1 GHz. 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 Table 1. Specifications for the P6246 and P6247 differential probes
fall into three categories: warranted, typical, and nominal characteristics.
Warranted Characteristics
Warranted characteristics (Table 1) describe guaranteed performance within
tolerance limits or certain type-tested requirements. Warranted characteristics
that have checks in the Performance Verification section are marked with the
n symbol.
Table 1: Warranted electrical characteristics
n DC attenuation accuracy ± 2% for input voltages ± 750 mV (÷ 1) and ± 7.5 V (÷ 10)
± 5% for input voltages ± 850 mV (÷ 1) and ± 8.5 V (÷ 10)
Maximum non destructive input voltage ± 25 V
n Differential signal range (DC coupled) ± 8.5 V at attenuation setting of ÷ 10
Common-mode signal range (DC coupled) ± 7V
n Output offset voltage ± 10 mV (+ 20_ Cto+30_ C)
Rise time (probe only) P6246: < 875 ps
n Common-mode rejection ratio 45 dB at 1 MHz in ÷ 10
(DC + peak AC)
± 850 mV at attenuation setting of ÷ 1
± 50 mV (0_ Cto+60_ C)
P6247: < 350 ps
25 dB at 100 MHz in ÷ 10
18 dB at 1 GHz in ÷ 10
60 dB at 1 MHz in ÷ 1
35 dBat 500 MHz in ÷ 1
30 dB at 1 GHz in ÷ 1
between signal and common of the same channel
n ÷
n ÷
n Bandwidth (probe only) P6246: DC to ≥ 400 MHz (-- 3dB)
P6247: DC to ≥ 1 GHz (-- 3dB)
Temperature Operating: 0 to + 50_ C,0to+60_ C1(probe head)
Nonoperating: -- 55 to + 75_ C
P6246 & P6247 Service Manual
1
1
Specifications
Table 1: Warranted electrical characteristics (cont.)
Humidity
1
See warning that follows.
Operating: 0--90% RH, tested at + 30 to + 50_ C
Nonoperating: 0--90% RH, tested at + 30 to + 60_ C
WARNING. To avoid a burn hazard at high ambient temperatures, do not touch
the probe with bare hands at operating temperatures above + 50_ Corat
nonoperating temperatures above + 70_ C.
Typical Characteristics
Typical characteristics (Tables 2 and 3) describe typical but not guaranteed
performance.
Table 2: Typical electrical characteristics
Differential input resistance, DC coupled 200 kΩ
Input resistance, DC coupled 100 kΩ ± 2%
Differential input capacitance < 1 pF at 1 MHz
Common-mode input capacitance < 2 pF at 1 MHz
Harmonic distortion ≤ 1.5% measured using 495 mV
Differential offset range ± 700 mV (÷ 1 setting)
± 7V(÷ 10 setting)
Common mode rejection ratio SeeFigure1
Random noise
Input impedance SeeFigure2
Bandwidth limit --3 dB at 200 MHz
DC reject bandwidth --3 dB at 4 Hz (÷ 10 setting)
Pass band ripple P6246: ≤±0.25 dB to the 3 dB bandwidth (deviation from a nominal slope)
< 50 nV Hzat 100 MHz
--3 dB at 0.4 Hz (÷ 1 setting)
P6247: ≤±0.25 dB to 850 MHz (deviat ion from a nominal slope)
RMS
(or 1.4 V
) output at 100 MHz
P-P
2
P6246 & P6247 Service Manual
dB
P6246
100
80
60
40
20
0
0 200 400 600 800 1000
MHz
P6247
Specifications
÷1
÷10
80
60
dB
40
20
0
0 200 400 600 800 1000
MHz
÷1
÷10
Figure 1: Typical Common-Mode Rejection Ratio (÷ 1 and ÷ 10 attenuation)
P6246 & P6247 Service Manual
3
Specifications
Impedance
(Ω)
100 k
10 k
1k
100
10
0
Frequency (Hz)
Figure 2: Typical input impedance versus frequency
1G500 M250 M 750 M
Table 3: Typical mechanical characteristics
Dimensions, input connection 0.63 mm (0.025 in) square pin on 2.54 mm (0.100 in) centers
Dimensions, control box 107 mm × 41 mm × 26 mm
(4.2 in × 1.6 in × 1.0 in)
Dimensions, probe head 78 mm × 12 mm × 9.3 mm
(3.0 in × 0.47 in × 0.36 in)
Dimensions, output cable 1.2m(47in)
Unit weight (probe only) 160g(5.4oz)
Nominal Characteristics
Nominal characteristics (Table 4) describe guaranteed traits, but the traits do not
have tolerance limits.
Table 4: Nominal electrical characteristics
Input configuration Differential (two inputs, + and -- ), with case ground
Output coupling DC and DC Reject
Attenuation settings ÷1 and ÷10
Termination Terminate output into 50 Ω
4
P6246 & P6247 Service Manual
Performance Verification
Use the following procedures to verify the warranted specifications of the P6246
and P6247 Differential Probes. Before beginning these procedures, refer to
page 15 and photocopy the test record and use it to record the performance test
results. The recommended calibration interval is one year.
These procedures test the following specifications:
H DC attenuation accuracy
H Differential signal range
H Output offset voltage
H Analog bandwidth
H Common mode rejection ratio
Equipment Required
Table 5 lists the equipment required to perform the performance verification
procedure. The types and quantities of connectors may vary depending on the
specific equipment you use.
NOTE. The procedures in this section require a network analyzer to perform the
analog bandwidth and CMRR tests. While a network analyzer is recommended
for these procedures, it is not always feasible to obtain a suitable model. For
alternative procedures that do not require a network analyzer, refer to Appendix A on page 37.
Table 5: Test equipment
Description Minimum requirements Example product
Calibrated DC voltage
source (2 required)
DMM (2 required) DC Accuracy ≥ 0.5% on range to
Network analyzer 100 kHz to ≥ 2 GHz, with cables
Adjustable from 0 V to ≥ 17 V.
Outputs must be isolated from
earth ground. DC bench supplies
monitored with DMM are adequate.
measure 8.5 V, averaging mode.
and adapters to BNC male
Tektronix PS280
Tektronix DMM916
Hewlett Packard 8753D
P6246 & P6247 Service Manual
5
Performance Verification
Table 5: Test equipment (cont.)
Description Example productMinimum requirements
Digitizing oscilloscope with
TekProbe interface
TekProbe Power Supply Tektronix Type 1103 Tektronix Type 1103
BNC cables (2) 50 Ω,42inch 012-0057-01
Fully compatible with TekProbe II
interface (needed only for functional check of the TekProbe interface)
Tektronix TDS 500, 600, or
700 series oscilloscope
Preparation
Banana-to-banana patch
cords (3)
Dual-male-banana-to-female BNC adapter (3)
BNC male to dual binding
post adapter (2)
0.025” square pins (3) Approximately 3/4 inch long,
Precision inline BNC
terminator
Probe tip adapters
Y-lead
BNC to probe tip
probe ground lead
2red
1black
As per description 103-0090-00
As per description 103-0035-00
smooth, gold plated.
50 Ω ± 0.1% 011-0129-00
(included in the standard probe tip
accessory kit)
012-0031-00
012-0039-00
020-2203-01
Prepare the equipment as follows:
1. Connect the y-lead adapter to the inputs of the probe and the ground lead to
the probe ground. (For a description of these accessories, refer to the list of
standard accessories on pages 31 and 32.)
2. Attach the probe to the 1103 TekProbe power supply.
3. If necessary, set the line selector of the 1103 power supply to the correct
voltage.
4. Turn on the 1103 power supply.
5. Set the 1103 offset to off (button not illuminated).
6. Allow the probe and test equipment to warm up for 20 minutes at an ambient
temperature of 20_ Cto30_ C.
Perform the verification procedures in order.
6
P6246 & P6247 Service Manual
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