Tektronix P6562A Bedienungsanleitung

Instructions

P6562A

350 MHz SMD Probe

070-8768-01

Second Edition: September 1993

Revised Printing: May 1994

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'%!% %&($*!&% !% * !) '+#!*!&% )+'() * * !% ## '(,!&+)#.

'+#!)  $*(!# '!!*!&%) % '(!  % '(!,!#) ()(,

(!%* !% *  

"*(&%!- %  &-  !#)&%,!##  

 #!' !' % +(&&* ( (!)*( *($(") &

"*(&%!- %



!            

      "       " 

     "  !   

             

    !    

       "   " ! 

    !   "    

          

          

" !     !  "    

             " 

  !         

"     !  "    

  "  

 "   "  "      " #

         !  

       "     

  "    !    

            

            

           

      "    

         

         

        

        

      

         

        

         

      

         

   

1P6562A Instructions

Getting Started

TheP6562A is a miniature, 350 MHz, 10X-attenuating passive probe

that is compatible with the TDS 460. It may also be used with

general purpose oscilloscopes having a 1 Minput impedance with

an input capacitance of 15 pF.

The P6562A is provided with several accessories designed to make

probing and measurement a simpler task. Please take a moment to

familiarize yourself with these accessories and their uses.

Figure 1 shows the probe and identifies various parts that are referred

to in these instructions.

Boot

Metal Sleeve

Probe Head

Probe Compensation Box

BNC Shell,

Locking Ring

Readout Pin

Figure 1: The P6562A Probe

General Safety Summary

Observe Maximum Working Voltage

Do not use the P6562A above 42 VDC.

Do Not Operate in an Explosive Atmosphere

To avoid personal injury or fire hazard, do not operate this product in

an explosive atmosphere.

Do Not Immerse in Liquids

Clean the probe using a damp cloth. Refer to the cleaning instruc-

tions on page 8.

P6562A Instructions 2

Accessories and Operation

Ground Lead

Ground lead with socket — Use the ground

lead to set a ground reference for your measure-

ments. The ground lead socket (0.025 inch) can

be connected to the KlipChipRtest clip, directly

to a square-pin ground on a circuit board, or to

the right-angle square pin adapter.

To attach the ground lead with socket to the

probe, gently slide the probe boot back to expose

the metal sleeve. Then, slide the ground lead’s

metal ring over the probe tip onto the probe’s

metal sleeve. Push the boot back over the metal

sleeve and the metal ring. Align the boot slot to fit

over the contact of the ground lead.

Push-In

Probe Tip

Push-in probe tip — Use the push-in probe tip

when you are probing circuits by hand. The tip

presses into the socket in the probe head.

To attach the push-in probe tip, seat the tip into

the probe head and push the tip in until it is

seated; do not force the tip. To remove the tip,

gently grab the tip with small pliers and pull the tip

out.

KlipChip

Ground Lead KlipChip — Use a KlipChip test clip to access

fragile, dense circuitry. To connect a KlipChip,

insert the probe socket into its body.

You can connect a second KlipChip to the ground

lead with socket. To attach the ground lead, insert

the ground lead socket into the KlipChip body.

The KlipChip body freely turns, allowing better

probe orientation. To reduce stress and provide a

lower profile on components being tested, the

flexible sleeve of the KlipChip bends up to a 35

degree angle.

Accessories and Operation

3P6562A Instructions

Right Angle

Adapter

Right-angleadapter — Use the right-angle

adapter to probe boards with 0.025-inch diameter

square pins; for example, on micro-computer and

communications backplanes.

Signal-Ground

Lead

Signal-Groundlead — Use the signal-ground

lead to substantially reduce ground lead

inductance. Because the ground lead simply

touches the ground reference (instead of clipping

onto it), you can easily move the probe to different

points on the device under test.

Signal-Ground

Lead Ring To attach the signal-ground lead, gently slide the

boot back to expose the probe’s metal sleeve.

Slide the metal ring of the signal-ground lead over

the probe tip onto the probe’s metal sleeve. Push

the boot back up to cover both the metal sleeve

and metal ring.

SureFootR— The SureFoot tip is an integral

probe tip and miniature guide that enables

fault-free probing of fine-pitch SMD packages.

The .025 SureFoot tip is designed to be

compatible with JEDEC 25 mil packages.

Short Ground blade — Use the short ground

blade with the SureFoot tip for probing ease and

improved signal fidelity. To use it, form a ground

plane of copper clad on the top of the IC to be

probed. Attach short jumper wires from the

device ground to the copper clad. With the

SureFoot tip installed, rest the short ground blade

on the ground plane while probing the IC.

Installing SureFoot — Install the short ground

blade using the same method as the signal-

ground lead. The SureFoot tip is pressed into the

probe head in place of the standard push–in tip.

Accessories and Operation

P6562A Instructions 4

Readout Pin Readout Pin — The BNC connector on the

probe compensation box includes a spring-loaded

pin that connects to a mating contact ring on

certain oscilloscopes. These oscilloscopes

recognize the attenuation factor of the probe and

automatically correcttheoscilloscopeindication of

scale factor.

You can see if your oscilloscope supports this

feature by watching the oscilloscope vertical scale

factor readout when attaching the probe. If the

displayed scale changes by a factor of 10—for

instance, from 10 mV to 100 mV—your oscillo-

scope supports this feature.

Adjustment tool — Use the insulated adjust-

ment tool to adjust the low- and high-frequency

adjustments in the probe compensation box.

Signal-Ground Lead

4IGround Lead

4IGround Lead with KlipChip Ground Lead Length — To maintain the best

signal quality, use the shortest possible ground

lead and signal input path.

5P6562A Instructions

Maintenance

Low-Frequency Probe Compensation

Probe low-frequency (LF) compensation may need adjustment after

moving the probe from one oscilloscope to another. Check the

low-frequency compensation before making critical rise time or

amplitude measurements.

1. Connect the P6562A to the oscilloscope.

2. Remove all accessories from the P6562A probe and attach the

push-in probe tip. Make sure the boot covers the probe’s metal

sleeve.

3. Connect the probe tip to a calibration signal. Most oscilloscopes

have a front-panel test point for this purpose; if yours does not,

use a signal generator that produces a well-formed square wave at

approximately 1 kHz.

4. Adjust the oscilloscope so that it displays two to five cycles.

5. Using the adjustment tool, adjust LF in the probe until you see a

flat-top square wave on the display. See figure 2.

1 kHz

Figure 2: P6562A Low-Frequency Adjustment

Maintenance

P6562A Instructions 6

High-Frequency Probe Compensation

The probe high-frequency compensation should seldom require

adjustment; however, your probe may require high-frequency

adjustment if any of the following are true:

Hthe probe has high-frequency aberrations

Hthe probe doesn’t perform at the rated bandwidth

Hthe oscilloscope input capacitance is near the limits of the probe

compensation range in Table 1 on page 10.

To perform the high-frequency compensation adjustment you will

need a signal source that has all of the following characteristics (see

figure 3):

Ha square-wave output at 1 MHz

Ha fast rise output with rise time less than 1 ns

1 MHZ

tr<1 ns

90%

10%

>1 vpp

Figure 3: High-Frequency Compensation Signal

The Tektronix PG506A Calibration Generator meets these require-

ments when properly terminated.

Maintenance

7P6562A Instructions

1. Remove the top plastic cover from the compensation box. (To

remove the cover, gently insert a tool, such as a small flat-blade

screwdriver, under one side of the cover and carefully pry up and

out.)

2. Connect the P6562A to the oscilloscope.

3. On the calibration generator, change the pulse period to 1 s

(1 MHz).

4. Connect the probe tip to the calibration signal. If you are using a

PG 506A, first connect a feed-through termination to the fast-rise

output, then connect the probe tip to the feed-through termina-

tion. The signal-ground clip can be used for the ground

connection.

5. Adjust the oscilloscope to view the first 40 ns of the waveform.

See figure 4.

6. Alternately adjust HF1 and HF2 for overall flatness. (These

adjustments interact.)

7. Adjust HF3 for the squarest waveform.

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