Tektronix P6246,P6247 Service Manual

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

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.

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

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......

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

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

Preface

P6246 & P6247 Service Manual

Specifications

20dBat500MHzi

18dBat1GHzi

n÷1

38dBat100MHzi

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 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

Specifications

Table 1: Warranted electrical characteristics (cont.)

Humidity

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 Hzat 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

P6246 & P6247 Service Manual

P6246

100

0 200 400 600 800 1000

MHz

P6247

Specifications

÷1

÷10

0 200 400 600 800 1000

MHz

÷1

÷10

Figure 1: Typical Common-Mode Rejection Ratio (÷ 1 and ÷ 10 attenuation)

P6246 & P6247 Service Manual

Specifications

Impedance

(Ω)

100 k

10 k

100

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

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

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.

P6246 & P6247 Service Manual

Output Offset Voltage

Performance Verification

1. Connect the probe as shown in Figure 3.

Digital multimeter

--+

Female BNC to male banana adapter

50 Ω precision terminator

50 Ω BNC cable

P6246/7

BNC to probe tip adapter

DM pair for offset test

CH 1

output

CH 1 input

1103

P6246 & P6247 Service Manual

Figure 3: Setup for the output offset voltage test

2. Set the probe to DC reject off, full bandwidth, and

3. Verify that the output voltage is

4. Change the probe attenuation to

5. Verify that the output voltage is

≤±10 mV.

÷ 1.

≤±10 mV.

÷ 10 attenuation.

6. Keep the output connections for the next procedure (DC attenuation accuracy).

Performance Verification

DC Attenuation Accuracy

1. Connect the probe input to the y-lead adapter and then to the DC source. Monitor the source voltage with the DMM.

2. Set the probe to DC reject off, full bandwidth, and

÷ 10 attenuation.

3. Set the input voltage on the DC source to approximately 5 V. Record the actual voltage as V

4. Record the output voltage as V

out

5. Set the input voltage on the DC source to approximately 1 V. Record the actual voltage as V

6. Record the output voltage as V

7. Calculate the attenuation as follows: (Vin1--Vin2) ÷ (V

out

1--V

out

2).

8. Verify that the attenuation is in the range of 9.8 to 10.2.

9. Set input voltage on the DC source to approximately 0.5 V. Record the actual

voltage as V

10. Change the attenuation to ÷ 1.

11. Record the output voltage as V

out

12. Set input voltage on DC source to approximately 0.1 V. Record the actual voltage as V

13. Record the output voltage as V

14. Calculate the attenuation as follows: (V

out

1--Vin2) ÷ (V

out

1--V

out

2).

15. Verify that the attenuation is in the range of 0.98 to 1.02.

16. Turn DC reject on.

17. Verify that the output returns to approximately 0 volts. (This is a functional

check; there is no specified performance limit.)

18. Turn DC reject off.

19. Keep the output connections for the next procedure.

P6246 & P6247 Service Manual

Differential Signal Range

This procedure directly verifies the differential signal range and indirectly verifies the common-mode signal range.

1. Connect the probe as shown in Figure 4. Use the adapters and patch cords as

Performance Verification

necessary to make the connections. Use square pins to connect the ground lead and y-lead to the power supplies.

Calibrated DC

voltage source

(Common-

mode source)

--+

Digital multimeter

--+

Calibrated DC

voltage source

(Differential-

mode source)

Y-lead adapter

Ground lead

Female BNC to male banana adapter

50 Ω precision terminator

Digital multimeter

--+

Black (-- )Red (+)

P6246/7

50 Ω

BNC cable

CH 1

output

--+

CH 1 input

1103

P6246 & P6247 Service Manual

Figure 4: Setup for differential-mode tests

2. Set the probe to DC reject off, full bandwidth, and

3. Set the common mode source to 7.0 V ± 50 mV.

4. Set the differential mode source to 8.5 V

voltage as V

5. Measure and record the output voltage as V

6. Calculate attenuation as V

÷ V

out

± 100 mV. Record the actual

out

÷ 10 attenuation.

Performance Verification

7. Verify that the attenuation is in the range of 9.5 to 10.5.

8. Remove the y-lead adapter from the probe and reverse the connection (black

to +, red to --).

9. Measure and record the output voltage as V

10. Calculate attenuation as V

÷ (-- V

out

11. Verify that the attenuation is in the range of 9.5 to 10. 5.

12. Set the differential mode source to 0.85 V

voltage as V

13. Make sure that the common mode source is still set to 7.0 V

14. Set the probe attenuation to

÷ 1.

15. Measure and record the output voltage as V

16. Calculate attenuation as V

÷ (-- V

out

± 10 mV. Record the actual

out

± 50 mV.

17. Verify that the attenuation is in the range of 0.95 to 1.05.

18. Remove the y-lead adapter from the probe and reverse the connection again

(red to +, black to --).

19. Measure and record the output voltage as V

÷ V

20. Calculate the attenuation as V

out

21. Verify that the attenuation is in the range of 0.95 to 1.05.

22. Remove all connections.

P6246 & P6247 Service Manual

Analog Bandwidth

Performance Verification

The following steps prepare the network analyzer for measuring bandwidth and CMRR. The actual settings may vary with different models of network analyzer. Refer to the user documentation supplied with the network analyzer for details on performing these steps.

NOTE. The alternative procedure for testing the analog bandwidth and CMRR without a network analyzer begins on page 37.

Preparation

Verification

The 1103 power supply can operate two probes. To keep the probe warmed up, move it to channel 2 of the 1103 while normalizing channel 1.

1. Set the network analyzer to measure transmission loss, S both ports.

2. Set the display format to log magnitude, 1 dB/div, reference value 0 dBm, linear frequency.

3. Set the start frequency to

4. Set the test port power to 0 dBm.

5. Attach the cable from port 1 to the 1103 channel 1 input connector (Tek-

Probe connector). Use a male BNC adapter if necessary.

6. Attach the cable from port 2 to the 1103 channel 1 output connector (conventional BNC). Use a male BNC adapter if necessary.

7. Normalize the network analyzer to remove the loss through channel 1 of the 1103 power supply.

1. Disconnect the port 1 cable from the 1103 channel 1 input connector.

≈ 1 MHz, stop frequency to ≈ 2 GHz.

. Attach cables to

P6246 & P6247 Service Manual

NOTE. Do not remove the end connected to the network analyzer. Connect the cable to the Probe Tip to BNC adapter.

2. Move the probe from the 1103 channel 2 to channel 1 input connector.

3. Set the probe for

4. Connect the probe input to the DM pins on the BNC-to-probe-tip adapter.

Polarity is unimportant.

÷ 1 attenuation, full bandwidth, DC reject off.

Performance Verification

5. The setup should now appear as shown in Figure 5.

Network analyzer

Port 1 Port 2

Female N to male

BNC adapter

Female N to male

BNC adapter

P6246/7

BNC to probe tip adapter

CM pair for CMRR test

DM pair for bandwidth test

Figure 5: Set up for analog bandwidth test and CMRR

CH 1

output

CH 1 input

1103

6. Read the amplitude at 400 MHz for the P6246 or 1 GHz for the P6247. The use of the marker function, (if equipped), will simplify resolving the bandwidth.

7. Verify that the amplitude is greater than -- 3 dB .

8. Set the probe

÷ 10 attenuation.

9. Change the reference value on the network analyzer to keep the plot on screen (-- 20 dBm).

10. Using the market (if equipped), measure the output amplitude at 400 MHz for the P6246 or 1 GHz for the P6247.

11. Verify that the amplitude is greater than -- 23 dB. (The additional 20 dB compensates for the

÷10 attenuation.)

12. Turn bandwidth limit on.

13. Verify that the -- 3dB bandwidth is approximately 200 MHz. (This is a

functional check only. There is no specified performance limit for the bandwidth limit function.)

P6246 & P6247 Service Manual

14. Set the probe back to full bandwidth.

15. Retain the setup for the next test.

Common Mode Rejection Ratio

If verification of analog bandwidth was not performed, or the calibration of the network analyzer has been altered, perform the calibration and normalization steps in the Preparation section of the Analog Bandwidth verification.

1. Return the reference value of the network analyzer to 0 dBm.

2. Connect the probe input to the CM pins on the BNC-to-probe-tip adapter.

Polarity is unimportant.

Performance Verification

3. Set the probe for

÷ 1 attenuation, full bandwidth, DC reject off.

4. Position the 0 dBm reference near the top of the screen.

5. The network analyzer plot is common mode feedthrough, the reciprocal of

common mode rejection ratio. CMRR can be read by inverting the sign of the magnitude, (i.e. -- 46 dBm common mode feedthrough equals + 46 dBm CMRR).

6. Measure the feedthrough magnitude at 1 MHz, 100 MHz, 500 MHz, and 1 GHz. Analyzers with marker capability can do this directly by setting the marker intercepts at 1, 100, 500, and 1 GHz. If necessary,turnonthe network analyzer Average mode with 16 averages to stabilize the reading.

7. Verify that the feedthrough is less than the values in

÷ 1 Measured Feed-

through column of Table 6.

Table 6: CMRR and Measured Feedthrough limits

÷ 1 Measured

Frequency

1MHz ≥ 60 dB ≥ 45 dB ≤ -- 60 dBm ≤ -- 65 dBm

100 MHz ≥ 38 dB ≥ 25 dB ≤ -- 38 dBm ≤ -- 45 dBm

500 MHz ≥ 35 dB ≥ 20 dB ≤ -- 35 dBm ≤ -- 40 dBm

1GHz ≥ 30 dB ≥ 18 dB ≤ -- 30 dBm ≤ -- 38 dBm

÷ 1CMRR ÷ 10 CMRR

Feedthrough

÷ 10 Measured Feedthrough

P6246 & P6247 Service Manual

8. Change the probe attenuation to ÷ 10.

9. Measure the feedthrough magnitude at 1 MHz, 100 MHz, 500 MHz, and

1 GHz. Analyzers with marker capability can do this directly by setting the marker intercepts at 1 MHz, 100 MHz, 500 MHz, and 1 GHz.

Performance Verification

10. Actual CMRR can be calculated by subtracting 20 dB from the absolute magnitudes to compensate for the attenuation. (i.e.| -- 68 dB| -- 20 dB = 48 dB). The calculation has been performed in the through column.

÷ 10 Measured Feed-

11. Verify that the feedthrough is less than the values in Feedthrough column of Table 6.

TekProbe Communication (operational check)

This step verifies correct operation of the TekProbe interface communication with compatible oscilloscopes. It requires a TDS series 500, 600, or 700 series oscilloscope.

1. Turn on the oscilloscope. Wait for the power up self test to complete.

2. Disconnect all cables or probes from the inputs.

3. Press the Autoset button.

4. Press the CH 1 button.

5. Use the Vertical Scale knob to set the vertical scale factor to 100 mV/div.

6. Press the Vertical Menu button.

7. Select the Coupling menu (left button along lower bezel).

8. If necessary, set the input impedance to 1 MΩ (bottom button along right

side of bezel).

÷ 10 Measured

9. Watch the input impedance setting while attaching the probe to the CH 1.

10. Verify that the input impedance changed to 50 Ω.

11. Set the probe attenuation to

12. Verify that the channel 1 scale factor is 1 V/div.

13. Set the probe attenuation to

14. Verify that the channel 1 scale factor is 100 mV/div.

This completes the functional check and the performance verification.

÷ 10.

÷ 1.

P6246 & P6247 Service Manual

Performance Verification

Test record

Probe Model/Serial Number: Certificate Number: Temperature: RH %: Date of Calibration: Technician:

Performance test Minimum Incoming Outgoing Maximum

Output offset voltage (÷10 setting)

± 10 mV (20_ Cto30_ C)

Output offset voltage (÷1 setting)

± 10 mV (20_ Cto30_ C) -- 10 mV

DC attenuation accuracy (÷10 setting) 9.8 _____________ _____________ 10.2

DC attenuation accuracy (÷1 setting) 0.98 _____________ _____________ 1.02

Differential signal range (÷10 setting)

Attenuation Attenuation with connections reversed

Differential signal range (÷1 setting)

Attenuation Attenuation with connections reversed

Analog bandwidth (÷1 setting)

P6246 at 400 MHz P6247 at 1 GHz

Analog bandwidth (÷10 setting)

P6246 at 400 MHz P6247 at 1 GHz

Measured feedthrough (verifies CMRR specifications)

÷1 setting

1MHz 100 MHz 500 MHz 1GHz

÷10 setting

1MHz 100 MHz 500 MHz 1GHz

-- 1 0 m V _____________ _____________ +10mV

_____________ _____________ +10mV

9.5

0.95

-- 3 d B

--60 dB

--38 dB

--35 dB

--30 dB

--65 dB

--45 dB

--40 dB

--38 dB

_____________ _____________

_____________ _____________ _____________ _____________

_____________ _____________

_____________ _____________ _____________ _____________

10.5

1.05

N/A N/A

N/A N/A N/A N/A

P6246 & P6247 Service Manual

Performance Verification

P6246 & P6247 Service Manual

Adjustment Procedures

These procedures are for use by qualified service personnel only.

Prepare the probe for adjustment as follows:

1. Remove the four screws attaching the top cover from the control box.

2. Remove the top cover.

3. Attach the probe to 1103 TekProbe Power Supply.

4. If necessary, set the line selector to the correct voltage.

5. Turn on the 1103 power supply.

6. Set the 1103 power supply offset to off (button not illuminated).

7. Allow at least 20 minutes for the equipment to warm up.

NOTE. Ambient temperature must be within 20_ Cto30_ C when you adjust the probe.

Equipment Required

In addition to the equipment required to perform the performance verification, the adjustment procedures require the equipment listed in Table 7.

Table 7: Test equipment

Description Minimum requirements Example product

Digitizing oscilloscope

(Required for adjustment procedure only)

Function generator

(Square and sine wave output)

50 Ω terminator

(needed only if oscilloscope does not support 50 Ω termination)

Bandwidth ≥100 MHz, average acquisition mode, vertical sensitivity 2 mV/div

Output level adjustable to 10 V output

50 Ω ±1 Ω 011-0049-01

, Separate Trigger or Sync

pk-pk

Tektronix TDS 300 series

Tektronix CFG 280

P6246 & P6247 Service Manual

Adjustment Procedures

TekProbe Readout Enable

(keep in this position)

÷ 1Offset

÷ 10 Gain

÷ 1 Gain

÷ 10 Offset

÷ 10 DC CMRR

÷ 1DCCMRR

Figure 6 shows the location of the adjustments inside the control box.

÷ 10 AC CMRR

÷ 1ACCMRR

Offset (preliminary)

Figure 6: Adjustment locations

NOTE. Do not attempt to adjust offset directly on an oscilloscope equipped with TekProbe Interface. These oscilloscopes utilize a closed loop compensation system for gain and offset which will interfere with the manual adjustment of the probe.

1. Connect the probe as shown in Figure 7.

P6246 & P6247 Service Manual

Adjustment Procedures

Digital multimeter

--+

Female BNC-to-male banana adapter

50 Ω precision terminator

CH 1

output

50 Ω

BNC cable

P6246/7

BNC-to-probe tip adapter

DM pair for offset test

CH 1 input

1103

Figure 7: Setup for the offset adjustment

2. Set the DMM to DC volts, 200 mV or 300 mV range, average on, average 10 readings.

3. Set the probe to

4. Adjust the

5. Change the probe attenuation to

6. Adjust the

÷ 1 attenuation, 200 MHz bandwidth, DC reject off.

÷ 1 offset adjustment for 0 mV ± 1mV.

÷ 10.

÷ 10 offset adjustment for 0 mV ± 1mV.

7. Keep the output cable set up for the next step.

P6246 & P6247 Service Manual

Adjustment Procedures

Gain

1. Setup the equipment as shown in Figure 8:

a. Remove the BNC to probe tip adaptor from the probe input. Insert the Y

lead adaptor into the probe tip.

b. With square pins, connect the red lead to the power supply positive

terminal, and the -- lead to the power supply negative terminal.

c. Connect a ground lead from the probe case ground to the negative

terminal of the power supply.

d. Connect a second DMM to a pair of banana leads from the power supply

outputs.

Calibrated DC voltage source

Digital multimeter

--+

Black (-- )Red (+)

Y lead adapter

Digital multimeter

--+

Female BNC-to-male banana adapter

50 Ω precision terminator

Ground

lead

P6246

BNC cable

50 Ω

--+

CH 1

output

1103

CH 1 input

Figure 8: Setup for gain adjustment

2. Set the DMM monitoring the output to DC volts, 2 or 3 volt range.

3. Set the DMM monitoring the input to the 2 or 3 volt range. Keep averaging turned on.

4. Set the probe to

÷ 1 attenuation, 200 MHz bandwidth, DC reject off.

P6246 & P6247 Service Manual

Adjustment Procedures

5. Adjust the power supply to output about 700 mV.

6. Adjust the ÷ 1 gain adjustment until the output voltage measures the same as

the input within

± 5mV.

Offset (Final)

DC CMRR

7. Change the probe attenuation to

8. Change the DMM monitoring the input to the 20 or 30 volt range.

9. Adjust the power supply to output approximately 7 V.

10. Adjust the

1/10 of the same voltage as the DMM monitoring the input within

11. Keep the probe output connections for the next step.

NOTE. The offset and gain adjustments interact.

1. Repeat steps 1 through 6 of the Offset (preliminary) procedure.

2. Remove the output cable termination and input for the next procedure.

÷ 10 gain adjustment until the DMM measuring the output reads

÷ 10.

± 5mV.

P6246 & P6247 Service Manual

1. Setup the equipment as shown in Figure 9:

a. Connect a BNC cable from the output of the 1103 to the Channel 1 input

of the oscilloscope. If the scope does not have 50 Ω input setting, add a 50 Ω inline BNC terminator at the scope input.

b. Connect the Y lead adaptor to the probe input. Using square pins,

connect both leads to the red binding post of a binding post to BNC adaptor. Connect the BNC adaptor to the function generator output. (If necessary, use a BNC cable and a female-to-female BNC connector between the BNC adaptor and the generator.) If the function generator reference (shield of the BNC connector) is isolated from ground, connect the ground lead from the probe case to the black binding post.

NOTE. Do not use the BNC to probe tip adaptor for this connection. The power level of the generator will exceed the terminator rating.

Adjustment Procedures

c. Connect a second BNC cable from the function generator Trigger or

Sync Output to the External Trigger or Channel 2 Input of the oscilloscope.

Function

generator

Test oscilloscope

Output Sync

Red Black

Black (-- )Red (+)

BNC-to-binding post adapter with square pins

Y lead adapter

Ch 1

Ground lead

P6246

50 Ω terminator

CH 1

output

Ext trigger

CH 1 input

1103

Figure 9: Setup for DC CMRR and AC CMRR adjustments

2. Set the probe to

÷ 1 attenuation, 200 MHz bandwidth, DC reject off.

3. Set the function generator to square wave, 1 ms period (1 kHz frequency), approximately 10 V

pk-pk

,(5Vpk).

4. Set the oscilloscope to display channel 1. Set channel 1 to DC and 50 Ω input impedance (or use external terminator), 2 mV/div. Set the time/division to 200 s/div. Set the trigger source to external (or Channel 2) Set the acquisition mode to average 8 to 10 acquisitions. Apply vertical bandwidth limiting if available to reduce noise.

5. Adjust the trigger level for a stable trigger. (If the trigger is obtained through channel 2, it may be necessary to change the volts/div setting.)

6. The displayed square wave is the common mode feedthrough. If the probe is severely misadjusted the waveform may be off screen. If necessary, increase the channel 1 volts/div to keep the waveform on screen.

7. Adjust the

÷ 1 DC CMRR for minimum amplitude in the flat portions of the

displayed waveform. This adjustment does not effect the leading edge transitions. Increase the vertical sensitivity as the amplitude decreases.

P6246 & P6247 Service Manual

Adjustment Procedures

AC CMRR

8. Change the probe to

9. Adjust the

the displayed waveform. This adjustment does not effect the leading edge transitions.

10. Keep the connections for the next procedure.

1. Change the function generator to sine wave.

2. Set the frequency of the function generator to 5 MHz and the output

amplitude to approximately 10 V pk-pk, (5 V peak).

3. Set the probe to

4. Change the scope horizontal 100ns/div. If necessary, adjust the channel 2

volts/div and trigger level for a stable trigger.

5. The displayed sine wave is the common mode feedthrough. If the probe is severely misadjusted, the waveform may be off screen.

6. Adjust the to completely eliminate the high frequency feedthrough.

÷ 10 DC CMRR for minimum amplitude in the flat portions of

÷ 1 AC CMRR for minimum amplitude. Usually it is not possible

÷ 10 attenuation.

÷ 1 attenuation, 200 MHz bandwidth, DC reject off.

7. Change the probe to

8. Adjust the

9. There is some interaction between the DC and AC CMRR adjustments.

Repeat the DC CMRR adjustment steps 5 -- 12.

10. Remove all connections from the probe. Carefully replace the top cover of the control box and the four retaining screws.

This completes the adjustment procedures.

÷ 10 AC CMRR for minimum amplitude.

÷ 10 attenuation.

P6246 & P6247 Service Manual

Adjustment Procedures

P6246 & P6247 Service Manual

Maintenance

The procedures in this section describe how to maintain and repair the P6246 and P6247 Differential Probes.

Cleaning

Remove dirt with a soft cloth dampened in a mild detergent and water solution or isopropyl alcohol.

CAUTION. To avoid damaging the probe, use only a mild detergent and water solution or isopropyl alcohol; do not use any other solvents or abrasive cleaners. Do not immerse the probe.

Replacing TekProbe Interface Pins

1. To remove the interface pin, grasp the pin with a pair of needle-nose pliers and gently pull the pin out. See Figure 10.

2. To replace the pin, insert the new pin into the socket and press it in against a hard surface.

Figure 10: Replacing TekProbe interface pins

P6246 & P6247 Service Manual

Maintenance

Removing and Replacing the TekProbe Interface Collar

1. To remove the collar, firmly pull the collar off by hand.

2. To replace the collar, align the smaller group of pins with the smaller of the

two holes in the interface collar and align the tabs with the slots. Gently press the two pieces together . See Figure 11.

Tab

Slot

Figure 11: Replacing the TekProbe collar

P6246 & P6247 Service Manual

Options

Option 95 is a report of the calibration data. This option must be ordered at the time of purchase.

P6246 & P6247 Service Manual

Specifications

P6246 & P6247 Service Manual

Replaceable Parts

Figure 12: P6246 and P6247 replaceable parts

P6246 & P6247 Service Manual

Replaceable Parts

Replaceable parts list

Fig. & index number

--1 010-- 0627--00 1 PROBE,DIFF,ACT:400MHZ BW, P6246 80009 010-- 0627--00

--2 131-- 3627--01 1 CONTACT,ELEC:GOLD PLATED TIP 18359 P-- 6158--1

--3 205-- 0191--XX 1 SHELL,ELEC CONN:BNC,ABS,DOVE GRAY 80009 205-- 0191--XX

--4 211--0001-- 00 8 SCREW,MACHINE:2--56 X 0.25,PNH,STL CD PL,POZ 93907 ORDER BY

Tektronix part number

010-- 0628--00 1 PROBE,DIFF,ACT:1GHZ BW, P6247 80009 010-- 0628--00

Serial no. effective

Serial no. discont’d

Qty Name & description Mfr. code Mfr. part number

Probe

DESCRIPTION

P6246 & P6247 Service Manual

Replaceable Parts

Replaceable parts list (cont.)

Fig. & index number

13-- 1 020 --2203--XX 1 ACCESSORY KIT:ACCESSORY KIT,P6246/P6247

--2 016-- 1879--XX 1 CASE,CARRYING:PROBE CARRYING CASE 80009 016-- 1879--XX

Tektronix part number

Serial no. effective

Serial no. discont’d

Mfr. part numberMfr. codeName & descriptionQty

Standard Accessories

80009 020-- 2203--XX

Includes the following accessories (depicted in order from left to right and top to bottom in Figure 13--1):

1 y--lead adapter

2 spring-loaded ground pins

2 TwinTip adapters

1 ground lead

2 short ground contacts

3 IC grabbers

1 probe-- tip--to--BNC adapter

2 TwinFoot adapters

10 Color marker bands (2 ea., various colors)

1 accessories case

(See the list of Optional Accessories and Figure 14 for ordering larger quantities of selected accessories.)

070-- 9898--XX 1 MANUAL,TECH:INSTRUCTIONS, 5 LANGUAGES 80009 070-- 9898--XX

070-- 9899--XX 1 MANUAL,TECH:SERVICE 80009 070-- 9899--XX

P6246 & P6247 Service Manual

Replaceable Parts

Figure 13: P6246 and P6247 standard accessories

P6246 & P6247 Service Manual

Replaceable Parts

Replaceable parts list

Fig. & index number

14-- 1 013 --0305--04 1 TIP,PROBE:PROBE TIP,PKG OF FOUR 80009 013-- 0305--04

--2 SMG50 1 IC GRABBERS, PKG OF 20 80009 ORDER BY

--3 SMK4 1 MICRO KLIPCHIP ADAPTERS, PKG OF 4 80009 ORDER BY

--4 013-- 0306--04 1 ADAPTER:DIFFERENTIAL PROBE,PKG OF FOUR

--5 013-- 0304--00 1 ADAPTER,PROBE:P6246/P6247 to P6046/HP1141A 80009 013-- 0304--00

--6 1103 1 TEKTRONIX 1103 TEKPROBE POWER SUPPLY 80009 ORDER BY

--7 012-- 0076--00 1 CA ASSY,RF:COAXIAL,RFD,50 OHM,20

--8 011--0049-- 01 1 TERMN,COAXIAL:50 OHM,2W,BNC 24931 28A123-- 1

Tektronix part number

Serial no. effective

Serial no. discont’d

Qty Name & description Mfr. code Mfr. part number

Optional Accessories

DESCRIPTION

80009 013-- 0306--04

013-- 0306--00,P6246

DESCRIPTION

80009 012-- 0076--00 L,BNC,MALE,STR,BOTH ENDS,W/STRAIN RELIEF BOOT BOTH ENDS,

P6246 & P6247 Service Manual

Replaceable Parts

1 2 3

Figure 14: P6246 and P6247 optional accessories

P6246 & P6247 Service Manual

Replaceable Parts

Manufacturers cross index

Mfr. code

18359 PYLON CO. INC. 51 NEWCOMB ST ATTLEBORO, MA 02703--1403

24931 BERG ELECTRONICS INC BERG ELECTRONICS RF/COAXIAL DIV

80009 TEKTRONIX INC 14150 SW KARL BRAUN DR

93907 CAMCAR DIV OF TEXTRON INC ATTN: ALICIA SANFORD

Manufacturer Address City, state, zip code

FRANKLIN, IN 46131 2100 EARLYWOOD DR PO BOX 547

BEAVERTON, OR 97077--0001 PO BOX 500

ROCKFORD, IL 611045181 516 18TH AVE

P6246 & P6247 Service Manual

Replaceable Parts

P6246 & P6247 Service Manual

Appendix A: Alternate Verification Procedures

This appendix contains alternate procedures for verifying the following specifications:

H Analog bandwidth

H Common mode rejection ratio

Use these alternate procedures only if it is not feasible to obtain a network analyzer.

For the complete set of performance verification procedures, refer to the Performance Verification section on page 5 and refer to this section when directed to do so.

Equipment Required

Table 8 lists the equipment required to perform the procedures in this section. The types and quantities of connectors may vary depending on the specific equipment you use.

Table 8: Test equipment

Description Minimum requirements Example product

Sine wave generator (preferably a synthesizer)

Spectrum analyzer 1 MHz to 1.8 GHz (dynamic range

TekProbe Power Supply Tektronix Type 1103 Tektronix Type 1103

BNC to Type N coax adapters (2)

BNC cables (2) 50 Ω,18inch 012-0076-00

Probe tip adapters

BNC to probe tip

0 dBm to 20 dBm from 1 MHz to 1 GHz.

≥100 dBm at 1 MHz)

Type N male to BNC female 103-0045-00

(included in the standard probe tip accessory kit)

Fluke 6066

Advantest R3365A

020-2203-01

P6246 & P6247 Service Manual

Appendix A: Alternate Verification Procedures

Preparation

Allow all test equipment to warm up for 20 minutes in an environment that is within the environmental conditions specified in Table 1 on page 1. Prepare the equipment as follows:

1. Connect the probe tip adapter to the inputs of the probe. (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 at least 20 minutes for the probe and equipment to warm up.

Perform the verification procedures in order.

P6246 & P6247 Service Manual

Analog Bandwidth

Appendix A: Alternate Verification Procedures

1. Normalize the setup as follows:

a. Connect the equipment as shown in Figure 15.

Spectrum analyzer

18-inch BNC

cable

Frequency synthesizer

18-inch BNC cable

CH 1

output

1103

Figure 15: Normalizing the setup

b. Set the synthesizer for 1 GHz/0 dBm for the P6247 probe and

400 MHz/0 dBm for P6246 probe.

CH 1 input

P6246 & P6247 Service Manual

c. Set the spectrum analyzer span to 10 MHz and the resolution bandwidth

to auto. Set the center frequency at 1 GHz and the reference level at 0 dBm for the P6247 probe. Set the center frequency at 400 MHz and the reference level at 0 dBm for the P6246 probe.

d. Set the vertical sensitivity at 1 dB/div.

e. Record the level displayed on the spectrum analyzer.

Appendix A: Alternate Verification Procedures

Spectrum analyzer

Frequency synthesizer

18-inch BNC cable

18-inch BNC

cable

P6246/7

BNC to probe tip adapter

CH 1

output

CH 1 input

1103

DM pair for Bandwidth test

CM pair for CMRR test

Figure 16: Setup for the analog bandwidth and CMRR tests

2. Disconnect the BNC cable from the 1103 input and connect the adapter and probe into the setup as shown in Figure 16. Use the DM pins of the BNC to probe tip adapter.

3. Set the probe to DC reject off, full bandwidth, and

÷ 1 attenuation.

4. Record the level displayed on the spectrum analyzer . Verify that the change in the level relative to the level recorded in step 1e is less than 3 dB (less than 1 dB is typical).

5. Change the probe attenuation to

÷ 10.

6. Change the reference level of the spectrum analyzer to --20 dBm.

7. Record the level displayed on the spectrum analyzer . Verify that the change

in the level (relative to the level recorded in step 1e on page 39) is less than 23 dB (greater than 20 dB is typical).

8. Keep the setup for the next procedure (CMRR).

P6246 & P6247 Service Manual

CMRR (Common Mode Rejection Ratio)

1. Normalize the setup as follows:

a. Remove the probe and probe tip adapter from the setup and connect the

equipment as shown in Figure 15.

b. Set the synthesizer to 1 MHz and 10 dBm.

c. Adjust the SA input attenuator to accept the high level of 10 dBm.

d. Set the reference level to 10 dBm, the center frequency to 1 MHz, and

the vertical scale to 10 dB/div.

e. Adjust the span to 10 kHz and the resolution bandwidth to auto.

f. Record the level displayed on the spectrum analyzer.

2. Remove the BNC cable from the 1103 input and insert the adapter and probe

as shown in Figure 16. Use the CM pins of the BNC to probe tip adapter.

Appendix A: Alternate Verification Procedures

3. Set the probe to DC reject off, full bandwidth, and

4. Change the spectrum analyzer reference level to --20 dBm.

5. Record the level displayed on the spectrum analyzer (be sure to factor in the

change in reference level, 30 dBm). It may be necessary to use the video filter to lower the noise floor. Verify that the change in the level (relative to the level recorded in step 1f above) is less than or equal to the ÷ 1 measured feed through column of Table 9 on page 42.

6. Set the probe to

7. Record the level displayed on the spectrum analyzer . Verify that the change

in the level (relative to the level recorded in step 1f above) is less than or equal to the (These values are 20 dB lower than the specification to account for the attenuation. )

8. Set the synthesizer to 100 MHz and 0 dBm.

9. Set the reference level to 0 dBm, the center frequency to 100 MHz and the

vertical scale to 10 dB/div. Adjust the span to 200 kHz and the resolution bandwidth to auto.

10. Connect the BNC cable from the synthesizer output to the 1103 input as shown in Figure 15.

÷ 10 attenuation.

÷ 10 measured feed through column of Table 9 on page 42.

÷ 1 attenuation.

÷ 10

P6246 & P6247 Service Manual

11. Record the level displayed on the spectrum analyzer.

12. Remove the BNC cable from the 1103 input and insert the adapter and probe

as shown in Figure 16. Use the CM pins of the BNC to probe tip adapter.

Appendix A: Alternate Verification Procedures

13. Set the probe to DC reject off, full bandwidth, and

÷ 1 attenuation.

14. Record the level displayed on the spectrum analyzer. V erify that the change in the level (relative to the level recorded in step 11 on page 41) is less than or equal to the

15. Set the probe to

÷ 1 measured feed through column of Table 9 on page 42.

÷ 10 attenuation.

16. Record the level displayed on the spectrum analyzer. V erify that the change in the level (relative to the level recorded in step 11 on page 41) is less than or equal to the

÷ 10 measured feed through column of Table 9 on page 42.

17. Set the synthesizer to 500 MHz and 0 dBm.

18. Set the spectrum analyzer center frequency to 500 MHz.

19. Repeat steps 10 through 16.

20. Set the synthesizer to 1 GHz and 0 dBm.

21. Set the spectrum analyzer center frequency to 1 GHz.

NOTE. Carefully dress the probe cable so that it does not cross itself or pass near the BNC to probe tip adapter. Improperly dressing the probe cable can affect the 1 GHz measurements.

22. Repeat steps 10 through 16.

Table 9: CMRR and Measured Feedthrough limits

÷ 1 Measured

Frequency

1MHz ≥ 60 dB ≥ 45 dB ≤ -- 60 dBm ≤ -- 65 dBm

100 MHz ≥ 38 dB ≥ 25 dB ≤ -- 38 dBm ≤ -- 45 dBm

500 MHz ≥ 35 dB ≥ 20 dB ≤ -- 35 dBm ≤ -- 40 dBm

1GHz ≥ 30 dB ≥ 18 dB ≤ -- 30 dBm ≤ -- 38 dBm

÷ 1CMRR ÷ 10 CMRR

feedthrough

÷ 10 Measured feedthrough

P6246 & P6247 Service Manual

Tektronix P6246,P6247 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

WARRANTY

Table of Contents

List of Figures

General Safety Summary

Preface

Related Manuals

Contacting Tektronix

Specifications

Warranted Characteristics

Typical Characteristics

Nominal Characteristics

Performance Verification

Equipment Required

Preparation

Output Offset Voltage

DC Attenuation Accuracy

Differential Signal Range

Analog Bandwidth

Common Mode Rejection Ratio

TekProbe Communication (operational check)

Adjustment Procedures

Equipment Required

Offset (preliminary)

Gain

Offset (Final)

DC CMRR

AC CMRR

Maintenance

Cleaning

Replacing TekProbe Interface Pins

Removing and Replacing the TekProbe Interface Collar

Options

Replaceable Parts

Appendix A: Alternate Verification Procedures

Equipment Required

Preparation

Analog Bandwidth

CMRR (Common Mode Rejection Ratio)