Tektronix P6458 Manual de usuario

010-6458-01

lektronOO

COMMITTED TO EXCELLENCE

Instructions

P6458

P6458 ACQUISITION CONTROL PROBE

3619-1

DESCRIPTION

The P6458 Acquisition Control Probe is a 4-channel active probe for use with the SA 501 Signature

Analyzer. The P6458 contains a hybrid integrated circuit that has four FET ampllifiers with differential EGL

outputs. All input channels of the hybrid circuits are protected from damage by static discharges. The high

input resistance and low input capacitance of the probe allows the circuit under test to perform close to

normal operating conditions, with minimal loading.

Probe input threshold levels are established by a voltage source supplied by the test instrument. The

P6458 outputs are compatible with test instruments having differential EGL receivers (e.g., types 10115 or

10216) with 100

differential-input termination. DC power for operating the probe circuitry is derived from

the associated instrument via the probe connector. The broad input range of the P6458 permits its use with

a wide variety of input signal levels.

This instrument is listed with Underwriters Laboratories, Inc., under UL Standard 1244 (Electrical and

Electronic Measuring and Test Equipment).

A Tektronix Lead Set (seeStandard Accessories) is provided with the probe and standard accessories

package. The five input leads (four signals plus one common ground connector) are each 9 inches long and

are molded into a common plug-in connector that plugs into the probe body. Fivemicrocircuit test probe tips

are supplied with the input lead set to provide a convenient means of attaching the inputs to the circuitry

under test. The individual signal leads are each color-coded to permit easy identification when making

connections.

070-3619-00

APRIL 1981

P6458 Acquisition Control Probe

SPECIFICATION

Electrical Characteristics

Characteristics Information

Input Resistance 1 Mn, ±50 kn.

Input Capacitance 5 pF, ± 1 pF (without input leads).

Maximum Input Threshold Control Voltage -16.25 V to +3.25 V with Hybrid powered from -5 V.

-10 V to + 10 V with Hybrid powered from + 5 V.

Maximum Dynamic Input Voltage -40 V to a maximum of 10 V above input threshold level.

-40 V to a maximum of 30 V above input threshold levelfor

RS 232 signals only.

Maximum Nondestructive Voltage to Input 40 V (de + peak ac).

Delay Time

Power Requirements

Voltage

Current

Temperature

Storage

Operating

Altitude

Storage

Operating

Characteristics

Weight (Probe Only)

Length

Probe Head and Cable

Input Lead Set (10-wide)

17 ns ± 2 ns with ± 1 V input signal and threshold at

4.7 V to 5.3 V.

140 mA or less at 5 V.

Environmental Characteristics

-55°C to + 75°C.

0°C to +50"C.

To 50,000 feet.

15,000 feet.

Physical Characteristics

Information

204 grams (7.1 ounces).

2 meters (6.5 feet).

25 centimeters (9.8 inches).

P6458 Acquisition Control Probe

OPERATING CONSIDERATIONS

Use of the P6458 as part of a logic analysis system is covered in the associated logic analyzer

instruction manual. The instructions in this section relate mainly to the various means of connecting the

P6458 into the circuitry under test.

Probe Cable Connector

The miniature 25-pin connector at the end of the probe cable should be carefully inserted into one of

the associated test instrument connectors.

Make sure that the probe cable connector is correctly aligned with the test instrument connec-

tor. Damage to the terminals can result from forcing one connector into another.

Probe Input

leads

The five probe input leads, individually color coded for easy identification of channels, are molded into

a common-connector at the output end (see Figure 1).To connect this assembly to the probe head, carefully

push the 5-terminal plug into the socket on the probe head. Be sure the correct sides of the probe head and

plug assembly are facing upward as illustrated. To remove the input-lead set, hold the probe head and pull

the assembly plug straight out away from the probe head.

To minimize the pickup of electromagnetic interference, input leads should be kept as short as possi-

ble. However, to avoid adding errors to critical timing measurements, input leads should all be the same

length.

Input Lead Color Coding

The probe input leads are color-coded as follows:

Channel Color

Ground White

0 Black

Brown

2 Red

3 Orange

P6458 Acquisition Control Probe

SMALL

ROUND HOLES

Figure 1. Installation of 5-wide input lead set.

Connecting Probe Input Leads to Circuitry

3619-2

A set of five plug-on microcircuit-test probe tips is supplied as a standard accessory to the P6458. The

probe tips can be attached to the test leads by pushing the lead end onto the recessed round pin near the

butt end of the probe tip (see Figure 2). Make sure that the round pin on the probe tip and the connector on

the end of the test lead are properly aligned to prevent damage.

To avoid damage to the probe, do not connect the ground lead to a voltage source above or

below ground reference.

Each probe tip has a retractable hook that grasps a lead, wire, or connector firmly (see Figure 3). To

use the retractable probe tip, push in the base of the probe tip until the hook appears (see Figure 4). Slip the

hook over a lead or connector and release the tip base. The hook will retract and grip the connection firmly.

INPUT TEST LEAD

CONNECTOR

Figure 2. Connection of input lead to probe tip.

TIP COMES

OUT

PUSH IN

WITH THUMB

P6458 Acquisition Control Probe

2515-5 2515-6

Figure 3. Attaching the retractable hook tip.

2515-7

Figure 4. Operation of retractable hook tip.

P6458 Acquisition Control Probe

Where several probe tips are to be connected close together in a compact area, the probe tips can be

attached vertically onto 0.020 to 0.034 inch round pin connectors or 0.025 inch square pins. Open the hook

by pressing the base of the probe tip and then slide the tip end down onto -theround or square pin (see

Figure 5).

Where space is even more restricted for making connections, pull the test lead out of the retractable

hook tip and slide the connector end of the test lead down onto the round or square pin (the lead connector

also fits onto 0.025 inch square pins and round pins from 0.020 to 0.034 inch). See Figure 6.

2515-8 2515-9

Figure 5. Attaching the hook tip vertically onto a pin connector. Figure 6. Attaching an input test lead connector onto a pio

connector.

6 @

P6458 Acquisition Control Probe

MAINTENANCE

The following servicing instructions are for use by qualified personnel only. To avoid personal

injury, do not perform any servicing other than that contained in the operating instructions

unless you are qualified to do

so.

The P6458 Probe is designed to withstand normal operation and handling. However, if the probe fails

or is damaged, replacement parts are available. See the Replacement Parts List for descriptions and part

numbers.

Cleaning

Dirt that accumulates on the probe head can be removed with a soft cloth dampened in a mild

detergent and water solution. Abrasive cleaners should not be used.

Avoid the use of chemical cleaning agents which might damage the plastics used in this instru-

ment. In particular, avoid chemicals which contain benzene, toluene, xylene, acetone or similar

solvents.

Recommended cleaning agents are isopropyl alcohol (lsopropanol) or ethyl alcohol (Fotocol or

Ethanol).

Contaminated contact areas of the connectors, hybrids, and circuit board can be cleaned with a

cotton-tipped applicator dipped in a recommended cleaning agent (above).

Probe Head Component Access

Do not remove hybrid frames

1. Remove the four corner screws and nuts which hold the probe halves together.

2. While pulling the probe body halves apart, note which half covers which side of the circuit board.

See Figure 7 for component locations on the circuit board; and see Figure 8 for probe head cable

connections.

P6458 Acquisition Control Probe

• •

U10

•

U14

OPPOSITE SIDE

PIN 1

.,f-•

if G

®~E!l

®o

EB®

ffi EB

@EB

0 •ego

.,' -@

@ CH 0, 2, 3, 4*

EI:

*THRESHOLD CONTROL

VOLTAGE INPUTS

Figure 7. Component locations on the circuit board.

3. Replace any detective components.

4. When reinstalling the circuit board in probe body, be sure that the body halt with channel identifica-

tion label covers the circuit board side with the channel input pins.

5. Replace the tour screws that hold the probe body halves together.

Troubleshooting

Equipment Required

• Test Oscilloscope

• Function Generator

• Power Supply

The following information is provided to aid in troubleshooting the P6458. Troubleshooting information

contained in the associated test-instrument instruction manual should be used with the following information

in locating malfunctions.

3619-3

P6458 Acquisition Control Probe

•

·~ 0

Figure 8. Probe head cable connections.

TWISTED

-fl-

PAIRS

CABLE

TO P10

GROUNDED

SHIELD

1. Isolate Trouble to a Circuit. To determine if the trouble is in the probe or the test instrument, use

the troubleshooting information in the instruction manual for the test equipment. If the probe is found to be

defective, proceed with step 2.

Visual Check. Remove the two halves of the probe body (refer to the Probe Head Component

Access procedure, above). Check the probe for visible indications of a defect. Look for broken wires,

damaged circuit board, damaged components, etc. Repair or replace any such defective parts. If there are

no visible indications of a defect, proceed with step 3.

3. Check Supply Voltage. The supply voltage to the P6458 can have various values depending upon

the voltage level used in the test instrument. Refer to the probe schematic and the test equipment instrument

instruction manual for the supply voltage assigned to the probe.

If all the channels are affected by the trouble, check supply Voltages, VCC, VDD, and VEE. If one or

more of the channels are operating correctly, proceed with step 4.

NOTE

Supply voltages are measured with respect to the test instrument chassis ground.

3619-4

P6458 Acquisition Control Probe

+VCC = Chassis Ground - VEE = Chassis Ground

Typical Voltage

+vcc = ov

+voo = -0.5v

-VEE= -5V

Typical Voltage

+vcc = +5V

+voo = +4.5V

-VEE= OV

a. If VCC does not have its assigned voltage, check the VCC cable wire (red) for continuity. If wire

shows no continuity, proceed to step 5.

b. If VEE does not have its assigned voltage, check the VEE cable wire (violet) for continuity. If wire

shows no continuity, proceed to step 5.

c. If the voltage at VDD is the same as VEE, check diode CR4 for an open. If the diode is open,

replace it.

d.. If the voltage at VDD is the same as VCC, check diode CR4 for a short. If the diode is shorted,

replace it.

4. Check Hybrid Operation. If the supply voltages are correct, check for a defective channel on one

of the hybrids.

a. Set the input threshold level of the test instrument to zero volts.

b. Connect a signal lead from a channel input on the probe to a 1 kHz square wave of +1 volt

to -1 volt (use a function generator).

c. With a test oscilloscope, check the + (plus) output (noninverting) and - (minus) output

(inverting) at the cableconnector and at the circuit board for the correct output waveform (see Figure9

for typical waveforms).

See Figure 8 for cable connections at the circuit board; and Figure 10 for output connector

assignments.

d. If an output sig"81is present on the circuit board, but not at the cable connector, check the

cable wire for continuity.

e. If there is no signal at any of the circuit board connections, suspect the hybrid. If the hybrid is

found to be defective, proceed to step 5.

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