x
P5100A & P5150 High Voltage Probes
Performance Verification and Adjustments
ZZZ
Technical Reference
*P077053002*
077-0530-02
xx
P5100A & P5150 High Voltage Probes
Performance Verification and Adjustments
ZZZ
Technical Reference
Revision A
www.tektronix.com
077-0530-02
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protected by na
tional copyright laws and international treaty provisions.
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previously published material. Specifications and price change privileges reserved.
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ducts are covered by U.S. and foreign patents, issued and pending. Information in this publication supersedes that in all
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.
Warranty
Tektronix warrants that this product will be free from defects in materials and workmanship for a period of 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 new or reconditioned to like new performance. All replaced
parts, modules and products become the property of Tektronix.
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 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 resulting from attempts by personnel
other than Tektronix representatives to install, repair 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 WARRANTY IS GIVEN BY TEKTR ONIX WITH RESPECT TO THE PR OD UC T 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 S OLE AND E XCLU S IVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX
AND ITS V ENDORS 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]
Table of Contents
General safety summary . . ... . .. . ... . ... ... . .. . ... . .. . ... . ... ... . .. . ... . .. . ... . ... ... . .. . ... . .. . ... . ... ... . .. . ... . .. . ... . .. . ... . .. . .. . iii
Service safe
Preface ................................................................................................................................. vi
P5100A Performance Verification..................................................................................................... 1
P5100A Adjustments . . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . . .. . ... . .. . ... . . .. . ... . .. . ... . . .. . ... . .. . ... . . .. . ... ... .... 5
P5150 Adjustments.. . .. . ... . ... ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . . .. . ... . .. . ... . . .. . ... . .. . ... . . .. . ... . .. . ... ..... 13
ty summary............................................................................................................... v
Test Equipm
Test Setup ........................................................................................................................ 1
System DC Attenuation Accuracy C heck . ... . ... ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . .. . ... . . .. . . 2
Test Recor
DC Gain and High Frequency (HF) Compensation. ... . .. . ... . .. . ... . ... ... . ... . . .. . ... . .. . ... . .. . ... . ... ... . ... . . .. . ... . .. . ... 7
Reassembl
ent................................................................................................................... 1
d....................................................................................................................... 4
e the Probe.......................................................................................................... 12
Table of Content
s
P5100A & P5150 High Voltage Probes Technical Reference i
Table of C ontent
s
ii P5100A & P5150 High Voltage Probes Technical Reference
General safety s
ummary
General safet
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
Connect and disconnect properly. Do not connect or disconnect probes or test leads while they are connected
to a voltag
Connect an
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 m
Ground th
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
e source.
d disconnect properly.
easurement instrument.
e product.
manual for further ratings information before making connections to the product.
y summary
Connect the probe output to the measurement instrument before connecting the
This product is grounded through the grounding conductor of the power cord. To avoid electric
t the probe reference lead to earth ground only.
Connec
Do not a
Do not o
Do not o
qualified service personnel.
pply a potential to any terminal, including the common terminal, that exceeds the maximum rating of that terminal.
perate without covers.
perate with suspected failures.
Do not operate this product with covers or panels removed.
If you s uspect that there is damage to this product, have it inspected by
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.
Keep product surfaces clean and dry.
Provide proper ventilation.
proper ventilation.
Refer to the manual's installation instructions for details on installing the product so it has
P5100A & P5150 High Voltage Probes Technical Reference iii
General safety s
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:
ummary
iv P5100A & P5150 High Voltage Probes Technical Reference
Service safety s
ummary
Service safet
Only qualified personnel should perform service procedures. Read this Service safety summary and the G e neral safety
summary before performing any service procedures.
Do not servic
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.
Use care when servicing with power on. Dangerous voltages or currents may exist in this product. Disconnect
power, rem
components.
To avoid electric shock, do not touch exposed connections.
ealone.
ove battery (if applicable), and disconnect test leads before removing protective panels, soldering, or replacing
y summary
Do not perform internal service or adjustments of this product unless another person capable of
P5100A & P5150 High Voltage Probes Technical Reference v
Preface
Preface
This manual contains procedures for checking the P5100A probe performance and for making adjustments to achieve the
warranted specifications. The P5150 probe section describes adjustment procedures only.
WARNING. The procedures included in this manual are for use by qualified service personnel only.
vi P5100A & P5150 High Voltage Probes Technical Reference
P5100A Performa
nce Verification
P5100A Perfor
Use these performance verification procedures to verify that the probe meets the warranted specifications. These
procedures should be performed in the order given using a DPO4104B oscilloscope with the equipment recommended in
the following table. (See Table 1.)
WARNING. The following instructions are for use by qualified service personnel only. To avoid electrical shock, do not
disassemble or maintain the probe while it is connected to a signal source other than those specified in these procedures.
NOTE. The probe must be low-frequency compensated before performance can be verified.
If your probe fails to qualify under these conditions, service-level adjustments (DC gain and high-frequency compensation)
may be required. These adjustments must be done by a trained service person.
Test Equipment
Table 1: Recommended test equipment
Equipment Minimum requirements Recommended test equipment
Oscilloscope ≥500 MHz BW, 1 MΩ ±1% input R Tektronix DPO4104B
Calibration generator ≤0.5% accuracy, 10 Hz square wave,
Adapter, BNC Female-to-female barrel
Adapter, probe tip-to-BNC Probe tip-to-male BNC
Pulse generator
Termination, 50 Ω feedthrough
BNC cable, precision
Adjustment tool
Screwdriver
2
Knife
1
Nine digit part numbers (xxx-xxxx-xx) are Tektronix part numbers
2
Required for adjustment procedures only
2
2
2
mance Verification
5V
output
p–p
≤500 ps rise time, ≥100 ns pulse width,
≥3V
into 50 Ω
p–p
2
2
50 Ω male-to-female BNC
50 Ω,36in
Insulated, straight edge 003-1433-xx
Flat blade
Razor edge
1
Fluke 9500B with 9530 active head
103-0028-xx
013-0291-xx
Picosecond Labs 2600C or
Fluke 9500B with 9530 active head
011-0049-xx
012-0482-xx
Test Setup
1. Turn on the oscilloscope.
2. Connect the probe to any channel (1–4) of the oscilloscope.
3. Turn on the generators and let the probe and test equipment warm up for 20 minutes.
4. Make a copy of the test record to tabulate the test results. (See Table 2 on page 4.)
P5100A & P5150 High Voltage Probes Technical Reference 1
P5100A Performa
nce Verification
System DC Attenuation Accuracy Check
1. Connect the test setup as shown.
Figure 1: Setup for oscilloscope gain check
2. Set the oscilloscope to:
vertical to 10 mV/division
horizontal to 20 ms/division
averaging to 64
3. Set the calibration generator to:
output frequency = 10 Hz
50 mV
square wave output
p-p
output into 1 MΩ load
4. Enable the calibration generator output.
5. Trigger the oscilloscope and center the waveform on the screen.
6. Use the amplitude measurement selection on the oscilloscope to measure the generator output voltage.
7. Divide the measured output from the previous step into 50 mV to derive a correction factor, CF.
For example, if you measured 50.13 mV, then the CF = 50/50.13 = 0.997.
The correction factor will be used in step 14 of this procedure to calculate the corrected amplitude, V
corr
.
2 P5100A & P5150 High Voltage Probes Technical Reference
P5100A Performa
nce Verification
8. Disconnect the calibration generator output from the oscilloscope and connect the probe to the same channel, as
showninthetes
t setup below. You must use the same oscilloscope channel throughout this procedure for the test
to be accurate and valid.
Figure 2: Setup for system accuracy check
9. Set the oscilloscope vertical to 1 V/division.
10. Set the calibration generator to 5 V
square wave output.
p-p
11. Enable the calibration generator output.
12. Trigger the oscilloscope and center the waveform on the screen.
13. Use the amplitude measurement selection on the oscilloscope to measure the voltage amplitude.
14. Calculate the corrected amplitude, V
by multiplying the measured output from the previous step by the correction
corr
factor (CF) derived in step 7.
For example, a measured output of 5.04 V multiplied by a correction factor of 0.997 yields a corrected amplitude
of 5.025 V.
15. Verify that the corrected amplitude, V
, is 5 V, ±0.088 V. Record the results in the test record.
corr
If your probe does not meet the specification, service-level adjustments (DC gain and high-frequency compensation) may be
required. (See page 5, P5100A Adjustments.) The procedures to make adjustments and to optimize the bandwidth and high
frequency response must be done by a qualified service technician.
P5100A & P5150 High Voltage Probes Technical Reference 3
P5100A Performa
nce Verification
Test Record
Photocopy this test record for recording the results of the performance verification procedures.
Table 2: P5100A probe test record
Probe Model Number: P 5100A
Probe Serial Number:
Temperature:
Date of Calibration:
Probe test Minimum Incoming Outgoing Maximum
System DC Attenuation
Accuracy
4.912 V 5.088 V
Certificate Number:
RH %:
Technician:
4 P5100A & P5150 High Voltage Probes Technical Reference
P5100A Adjustments
To gain access to the adjustments, you must disassemble the probe compensation box as described below.
1. Using a razor knife, cut in half the two labels on the sides of the compensation box, along the top and bottom cover
seams. Be careful to not damage the labels; they must remain intact and on the probe due to regulatory requirements.
P5100A Adjustme
nts
Figure 3: Cut the two side labels in half
2. Separate the covers by inserting a thin flat-blade screwdriver into the one of the slots on the side of the compensation
box. The slots are hidden beneath the labels.
Figure 4: Separate the covers
P5100A & P5150 High Voltage Probes Technical Reference 5
P5100A Adjustme
3. Lift the cable end of the top cover away from the compensation box and then pull the cover out of the connector housing.
nts
Figure 5:
Remove the top cover from the probe
The five adjustments that you will likely need to access are available through the openings in the metal shield. If you need
to access the sixth adjustment (fine LF comp), you must slide the metal shield away from the connector end of the probe.
Figure 6: P5100A probe adjustment locations
6 P5100A & P5150 High Voltage Probes Technical Reference
DC Gain and High Frequency (HF) Compensation
Precision or high-frequency compensation is not a common user adjustment. However, precision compensation should be
checked if the probe was repaired or if any of the following conditions are true:
The probe has excessive high-frequency aberrations.
You have installed the probe on an oscilloscope having an input capacitance near the limits of the probe compensation
range.
To perform the high-frequency compensation adjustment you w ill need a signal source that has all of the following
characteristics:
P5100A Adjustme
nts
Fast rise output with rise time ≤500 ps
Output properly terminated
The Picosecond Labs 2600C Pulse Generator output meets these requirements when properly terminated.
P5100A & P5150 High Voltage Probes Technical Reference 7
P5100A Adjustme
Gain Adjustment (DC Accuracy)
1. Connect the probe as shown in the System DC Attenuation Accuracy Check setup. (See Figure 2 on page 3.)
2. Set the oscilloscope to:
3. Set the calibration generator to:
4. Locate R9 (the DC gain adjustment).
WARNING. To reduce risk of electric shock, use only the provided insulated adjustment tool when making adjustments.
Hazardous voltages may be present inside the compensation box.
nts
vertical to 1 V/division
horizontal to 20 ms/division
averaging to 64
output frequency = 10 Hz
5V
square wave output
p-p
output into 1 MΩ load
Figure 7: R9 (D
C gain) adjustment location
5. Adjust the DC gain (R9) to a probe output level of 5 V, ±0.088 V, as displayed on the oscilloscope.
6. Record the output level in the outgoing column of the System DC Attenuation Accuracy check in the test record.
8 P5100A & P5150 High Voltage Probes Technical Reference
P5100A Adjustme
Low-Frequency Compensation (LF) Adjustment
1. Connect the probe to the Probe Compensation output of the oscilloscope and check the LF comp of the probe. If it
needs adjustment, do the following:
Adjust L F compensation with C2, and if necessary, do a minor adjustment to C116 for best LF flatness.
Figure 8: C2 (LF) and C116 (fine LF) adjustment locations
nts
Use C2 to check LF compensation range over and under compensation range.
Use C2 for a coarse LF adjust and use C116 to get a consistent roll up or roll off.
Finally, go back and use C2 one last time to flatten the overall response.
2. Proceed to the High Frequency (HF) Adjustment. (See page 10.)
P5100A & P5150 High Voltage Probes Technical Reference 9
P5100A Adjustme
High Frequency (HF) Adjustment
1. Connect the test setup as shown.
Figure 9: Setup to adjust HF response
nts
2. Set the ou
3. Set the o
vertica
horizo
averag
input i
4. Adjust
the HF response as follows:
tput level of the pulse generator to 5 volts (20 dB) and the pulse width to 100 ns.
scilloscope to:
l to 1 V/division
ntal to 4 ns/division
ingto64
mpedance to 1 MΩ
10 P5100A & P5150 High Voltage Probes Technical Reference
P5100A Adjustme
nts
Figure 10: Areas of the waveform affected by adjustments R1, R2, and R3
First adjust R1 to flatten out to 20-30 ns.
Next, adjust R3 for the 10-20 ns area.
Adjust R2 for the last ~5 ns. If the overshoot is too great, then adjust R2 to roll off the front corner and readjust R3
followed by R1. The procedure is done when the 3 adjustments have been optimized for the best overall response.
5. Reassemble the probe. (See page 12, Reassemble the Probe.)
P5100A & P5150 High Voltage Probes Technical Reference 11
P5100A Adjustme
nts
Reassemble the Probe
If you removed the metal shield to access the fine LF adjustment, it is easier to reinstall the shield with the bottom cover
removed, so begin with step 1. Otherwise, skip to step 3.
1. Remove the bottom cover.
2. Install the shield over the circuit board so that the shield covers the metal ends of the board housing. (See Figure 11.)
3. Using your thumb or finger to hold the shield in place, align and seat the probe into the bottom cover, beginning at the
cable end. As you seat the probe into the connector end of the cover, pull out the spring-loaded connector to allow it to
clear the front edge of the cover and fully seat into the bottom cover.
Figure 11: Align and seat the probe into the bottom cover
4. Verify that the metal shield is properly located. (See Figure 11.) Align the top cover onto the probe, beginning at the
cable end. As you seat the cover onto the connector end of the probe, pull out the connector to allow the cover to
clear the connector and to engage with the bottom cover.
Figure 12: Install the top cover
5. Recheck that the probe functions properly.
End of procedure.
12 P5100A & P5150 High Voltage Probes Technical Reference
P5150 Adjustments
These procedures describe how to make low- and high-frequency compensation adjustments to the P5150 probe. Use
the equipment listed below for the test setup.
Table 3: Recommended test equipment
Equipment Minimum requirements Recommended test equipment
Oscilloscope
Pulse generator ≤500 ps rise time, ≥100 ns pulse w
Termination, 50 Ω feedthrough 50 Ω male-to-female BNC
Adapter, BNC Female-to-female barrel
Adapter, probe tip-to-BNC Probe tip-to-male BNC
BNC cable, precision 50 Ω,36in
Adjustment tool Insulated, straight edge 003-1433-xx
Screwdriver
1
Nin
2
P5150 probes are intended for use with oscilloscopes that have isolated (floating) inputs. The Tektronix TPS2024B and THS3024 oscilloscopes
are the highest bandwidth floating-input oscilloscopes currently available. If you do not have access to one of these oscilloscopes, use the
recommended ground-referenced model.
2
e digit part numbers (xxx-xxxx-xx) are Tektronix part numbers
≥200 MHz bandwidth (floating input)
≥500 MHz bandwidth
(ground-referenced input)
≥3V
into 50 Ω
p–p
Flat blade
idth,
P5150 Adjustmen
Tektronix TPS2024B or THS3024
Tektronix TDS3054C
Picosecond Labs 2600C or
Fluke 9500B with 9530 active head
011-0049-xx
103-0028-xx
013-0291-xx
012-0482-xx
ts
1
Access the Adjustments
To gain access to the adjustments, you must slide the cover off of the probe body. Insert a thin flat-blade screwdriver into the
slot on the top of the compensation box and slide back the cover. (See Figure 13.)
Figure 13: Depress the tab and slide back the cover
P5100A & P5150 High Voltage Probes Technical Reference 13
P5150 Adjustmen
Low-Frequency Compensation (LF) Adjustment
1. Connect the probe to the compensation output of the oscilloscope and check the LF comp of the probe. If it needs
adjustment, do the following:
Figure 14: LF and fine LF adjustment locations
ts
Use C2 to check that the LF compensation range spans above and below the optimized response.
Adjust LF compensation with C2, and if necessary, do a m inor adjustment to C116 for best LF flatness.
Use C2 for a coarse LF adjust and use C116 to get a consistent roll up or roll off.
Finally, go back and use C2 one last time to flatten the overall response.
2. Proceed to the High Frequency (HF) Adjustment. (See page 15, High Frequency (HF) Adjustment.)
14 P5100A & P5150 High Voltage Probes Technical Reference
P5150 Adjustmen
High Frequency (HF) Adjustment
1. Connect the probe and equipment as shown in the High Frequency (HF) Adjustment setup for the P5100A probe.
(See Figure 9 on page 10.)
2. Set the oscilloscope horizontal to 4 ns/div. (Adjust the oscilloscope as necessary to view the leading edge of the
waveform.)
3. Adjust the HF response as follows:
ts
Figure 15: Areas of the waveform affected by adjustments R1, R2, and R3
adjust R1 to flatten out to 20-30 ns.
First
, adjust R3 for the 10-20 ns area.
Next
st R2 for the last ~5 ns. If the overshoot is too great, then adjust R2 to roll off the front corner and readjust R3
Adju
followed by R1. The adjustments are complete when you have optimized the waveform.
4. Slide the probe cover back over the probe body until the body tab engages with the cover slot.
End of procedure.
P5100A & P5150 High Voltage Probes Technical Reference 15
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