Tektronix P5100A Use and care manual

x
P5100A & P5150 High Voltage Probes
Performance Verification and Adjustments
ZZZ
Technical Reference
*P077053002*
077-0530-02

P5100A & P5150 High Voltage Probes
Performance Verification and Adjustments
ZZZ
Technical Reference
xx
Revision A
www.tektronix.com
077-0530-02

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.

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 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. 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.
[W2 – 15AUG04]

Table of Contents
Table of Contents
General safety summary .............................................................................................................. iii
Service safety summary............................................................................................................... v
Preface................................................................................................................................. vi
P5100A Performance Verification..................................................................................................... 1
Test Equipment................................................................................................................... 1
Test Setup ........................................................................................................................ 1
System DC Attenuation Accuracy Check .. ....... ..... ....... ..... ....... ..... ....... ..... ....... ..... ....... ..... ....... ..... . 2
Test Record....................................................................................................................... 4
P5100A Adjustments .................................................................................................................. 5
DC Gain and High Frequency (HF) Compensation.. ..... ..... ..... ..... ....... ..... ..... ..... ..... ....... ..... ..... ..... ..... . 7
Reassemble the Probe.......................................................................................................... 12
P5150 Adjustments................................................................................................................... 13
P5100A & P5150 High Voltage Probes Technical Reference i

Table of Contents
ii P5100A & P5150 High Voltage Probes Technical Reference

General safety summary
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.
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 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.
Ground the product. This product is grounded through the grounding conductor of the 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.
Connect the probe reference lead to earth ground only.
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.
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.
P5100A & P5150 High Voltage Probes Technical Reference iii

General safety summary
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:
iv P5100A & P5150 High Voltage Probes Technical Reference

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 servicealone. 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.
Use care when servicing with power on. Dangerous voltages or currents may 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.
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 Performance Verification
P5100A Performance Verification
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 1
Oscilloscope ≥500 MHz BW, 1 MΩ±1% input R Tektronix DPO4104B
Calibration generator ≤0.5% accuracy, 10 Hz square wave,
5V
p–p output
Fluke 9500B with 9530 active head
Adapter, BNC Female-to-female barrel 103-0028-xx
Adapter, probe tip-to-BNC Probe tip-to-male BNC 013-0291-xx
Pulse generator 2≤500 ps rise time, ≥100 ns pulse width,
≥3V
p–p into 50 Ω
Picosecond Labs 2600C or
Fluke 9500B with 9530 active head
Termination, 50 Ωfeedthrough 250 Ωmale-to-female BNC 011-0049-xx
BNC cable, precision 250 Ω,36in 012-0482-xx
Adjustment tool 2Insulated, straight edge 003-1433-xx
Screwdriver 2Flat blade
Knife 2Razor edge
1Nine digit part numbers (xxx-xxxx-xx) are Tektronix part numbers
2Required for adjustment procedures only
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 Performance 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 mVp-p square wave output
output into 1 MΩload
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, Vcorr.
2 P5100A & P5150 High Voltage Probes Technical Reference

P5100A Performance 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 Vp-p square wave output.
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, Vcorr by multiplying the measured output from the previous step by the correction
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, Vcorr, is 5 V, ±0.088 V. Record the results in the test record.
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 Performance 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: P5100A
Probe Serial Number:
Temperature:
Date of Calibration:
Certificate Number:
RH %:
Technician:
Probe test Minimum Incoming Outgoing Maximum
System DC Attenuation
Accuracy
4.912 V 5.088 V
4 P5100A & P5150 High Voltage Probes Technical Reference

P5100A Adjustments
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.
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 Adjustments
3. Lift the cable end of the top cover away from the compensation box and then pull the cover out of the connector housing.
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

P5100A Adjustments
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 will need a signal source that has all of the following
characteristics:
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 Adjustments
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:
vertical to 1 V/division
horizontal to 20 ms/division
averaging to 64
3. Set the calibration generator to:
output frequency = 10 Hz
5V
p-p square wave output
output into 1 MΩload
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.
Figure 7: R9 (DC 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