Tektronix P6120 Passive Oscilloscope Probe Instructions

Tektronix P6120 Passive Oscilloscope Probe

SPECIFICATION

INTRODUCTION
The TEKTRONIX P6120 is a miniature, 10X passive probe designed for use with de to 60 MHz oscilloscopes having an input capacitance range of 23 to 51 pF (1.5 Meter length) and an input resistance of 1 MD. The compensating box houses an adjustable network that provides optimum  transient response when the probe is used with oscillo­ scopes having bandwidths up to 60 MHz.

ACCESSORIES

• Standard accessories for the P6120 include this instruc­tion manual, an accessory pouch, a ground lead, a retract­able hook tip, an insulating sleeve, and two marker bands.
• Use of accessories is described later in this manual.

PERFORMANCE CONDITIONS

• The electrical characteristics listed in Table 1 are valid for a compensated probe used with a calibrated oscilloscope system and operated within the environmental conditions stated in Table 2. The oscilloscope must be operating in an ambient temperature between +20° C and +30 ° C ( +68° F to + 86° F). Physical characteristics for the P6120 Probe are listed in Table 3.
• Items listed in the “Performance Requirement” column are verifiable qualitative or quantitative limits. Items listed in the “Supplemental Information” column are not verified in this manual; they are either explanatory notes, performance characteristics for which no absolute limits are specified, or characteristics that are impractical to check.

P6120 Passive Probe

Temperature Range

Operating

| ****

-15° to +75°C (+5° to +167°F).

Nonoperating| -62° to+75°C (-80° to + 167°F).
Altitude

Operating

| ****

To 4,500 m (15,000 ft).

Nonoperating| To 15,000 m (50,000 ft).
Humidity

Nonoperating

| ****

Five cycles (120 hours) at 95% to 97% relative humidity.

Shock

Nonoperating

| ****

To 500 g’s, 1/2 sine; 1/2 ms, 1 ms, duration 18 shocks, 3 axes.

Transportation| Qualifies under National Safe Transit Test Procedure 1A, 48-inch drop.

Net Weight (Including.

Accessories)

1.5 Meter Probe

| ****

3 oz(85 g)

 | 3.0 Meter Probe| 4.3 oz(122 g)

OPERATING CONSIDERATIONS

PROBE HANDLING
The P6120 Probe and its accessories should be handled carefully at all times to avoid damage. The following precau­tions are recommended:

1. Avoid dropping the probe head, since damage to the probe tip may occur.
2. Treat the probe tip with care. When not in use, protect the probe tip by covering it with the retractable hook tip.
3. Exercise care to prevent crushing the cable or placing excessive strain on it by pulling.

PROBE GROUNDING
A passive probe is a capacitive divider for high-frequency signal components. Inductance introduced by either a long signal lead or ground lead will form a series-resonant circuit that will ring if driven by a signal containing significant fre­quency components at or above circuit resonance. These oscillations (ringing) can appear on the oscilloscope display and distort the true waveform. The ground lead and probe signal input connections should be kept as short as possible to maintain the best waveform fidelity.

PROBE ACCESSORIES
The standard accessories for the P6120 Probe are listed under “Accessories” in the “Replaceable Parts List” at the back of this instruction manual and are described in the fol­lowing paragraphs. These accessories are supplied to aid in connecting the probe to circuitry under test and to protect the probe against damage (see Figure 3).
Ground Lead
Proper grounding will minimize the chance of ringing on the oscilloscope display. The 250-mm ground lead has a miniature alligator clip at one end for attaching the probe to the oscilloscope ground. Attached to the other end is a met­al tip which should be carefully inserted into the connector receptacle on the probe head.

Insulating Sleeve
The small tubular insulating sleeve supplied with the probe should be placed over the metal sleeve of the probe tip when using the ground lead. Use of this sleeve will pre­vent inadvertent grounding of the circuitry under test. The sleeve should be removed when using the retractable hook tip.

Retractable Hook Tip
The retractable hook tip provides a hands-free connec­tion to a test point or component lead so that other adjust­ments or functions may be accomplished.
NOTE

• Tektronix manufactures several different hook tips. Be sure to use the hook tip specified in this manual’s parts list. Other retractable hook tips may not seat properly.
• Tektronix manufactures several different hook tips. Be sure to use the hook tip specified in this manual’s parts list. Other retractable hook tips may not seat properly.

Optional Accessory
Tip, Probe with Actuator. Part No. 013-0191-00. Specifi­cally designed for use in constricted environments I.E. de­signing and troubleshooting DIP circuitry.

PROBE COMPENSATION

• Due to slight variations in oscilloscope input capacitance, it is usually necessary to compensate the probe whenever it has been transferred for use from one instrument to another or from one channel to another on the same oscillosoope.

• Probe Compensation Adjustment

• To compensate the probe, use the following procedure and the equipment referenced from Table 4.
  Equipment Required (See Table 4)

  • Oscilloscope System (Item 1)
  • Square-Wave Generator (Item 2)’
  • Adapter (Item 5)’
  • Low-Capacitance Adjustment Tool (Item 6)
    Item and Description| Minimum Specification| Use| I| Examples of Applicable Equipment
    ---|---|---|---|---
    –

1. Oscilloscope

| System| Bandwidth: 60 MHz or greater. Deflection factor: 20 mV/div

(0.2 V/div with probe).

| Probe compensation

adjustment and bandwidth check.

| TEKTRONIX 2213

Oscilloscope.

2. Square-Wave

Generatora

| Square-wave frequency: 1 kHz. Amplitude: 1.0 V into 1 Mil.| Probe compensation adjustment.| TEKTRONIX PG 506

Calibration Generator.

3. Leveled Sine-Wave Generator| Amplitude: adjustable from 0 V to 1.0 V. Frequency: variable to at least 60 MHz plus fixed SO-kHz reference.| Bandwidth check.| TEKTRONIX SG 503

Leveled Sine-Wave Generator.

4. Ohmmeter| Accuracy: 0.11% of resistance reading.| Attenuation check.| Hewlett-Packard 3465B.
5. Adapter| Probe-tip-to-bnc male.| Probe compensation adjustment’. Bandwidth

check.

| TEKTRONIX Part Number 013-0084-01.
6. Low-Capacitance Adjustment Tool| Bit size: 1/16 inch.| Probe oompensation adjustment.| TEKTRONIX Part Number 003-0675-01.

1. Set the oscilloscope controls as follows:
   • Volts/Div: 20 mV
   • Sec/Div: 1 ms
   • Bandwidth: Full
   • Input Coupling: DC
2. Attach the probe bnc connector to the oscilloscope vertical-channel input.
3. Connect the probe tip to the oscilloscope calibration signal output. If the oscilloscope does not have a calibration output, a calibration generator may be used as follows:
   • Set the square-wave generator for an output of 1.0 V. The signal output should be a square wave at approximately 1 kHz.
   • Connect the probe tip to the generator output via a probationer adapter.
4. Set the oscilloscope triggering controls for a stable, triggered display. The display should be approximately 10 square-wave cycles with an amplitude of 5 divisions. Center the display on the screen.

PERFORMANCE CHECK

This part describes procedures for verifying the probe’s bandwidth, rise time, and attenuation accuracy.

TEST EQUIPMENT REQUIRED
The test equipment listed in Table 4, or an equivalent piece of test equipment, is required to accomplish a com­plete Performance Check. In Table 4, the specifications giv­en for the equipment are the minimum necessary to provide accurate results. Therefore, the equipment used must meet or exceed the listed specifications. Detailed operating in­structions for the test equipment are not provided in these procedures. Refer to the appropriate test equipment instruc­tion manual if more operating information is required.

PERFORMANCE CHECK PROCEDURE

1. Bandwidth and Rise Time Checks

  * Perform the “Probe Compensation” procedure using the test oscilloscope.
  * Set the oscilloscope Volts/Div 20mV/Div(0.2V/Div including 10X Time/Div to 1 ms. switch to probe.) and
  * Connect the probe tip to the leveled sine-wave generator output via a probe-lip-t0-bnc adapter.
  * Set the sine-wave generator frequency-range switch to Ref-0.5 (50 kHz) and set its output amplitude control to produce a 6-division display on the oscilloscope. Then center the display on the crt screen.
  * Adjust the generator frequency-range switch to the 50- to 100-MHz range and slowly increase the setting of the variable frequency control until the display amplitude decreases to exactly 4.2 divisions (-3 dB).
  * CHECK-That bandwidth of the probe/ oscilloscope system, as indicated by the sine-wave generator frequency readout, is at least 60 MHz.
  * Once the bandwidth of the system is known, the approximate rise time can be calculated using the formula:

With a bandwidth of 60 MHz, the rise time is (approximately)5.9 ns.

2. **Probe Attenuation Accuracy Check

**

  * Connect one lead of the precision ohmmeter to the probe tip and the other lead to the inner conductor of the probe bnc connector.
  * CHECK-that the meter reading is between 8.91 and 9.09 Mil.  

NOTE
When the meter reading is between 8.91 and 9.09 Mil and the test oscilloscope has an input resistance accuracy as described in the “Speci­fication” section, the probe attenuation will be within its specified limits.

MAINTENANCE

WARNING
To avoid electrical shock, do not perform any probe maintenance while the probe is connect­ed to a signal or voltage source.

CLEANING
CAUTION
Do not use chemical cleaning agents which might damage the materials used in this probe. In particular, avoid chemicals which contain benzene, toulene, xylene, acetone, or similar solvents. Use only recommended cleaning agents.
Occasional cleaning may be required. Dirt that accumu­lates on the probe can be removed with a soft cloth damp ened in any one of the following recommended cleaning agents: mild detergent and water solution, isopropyl alcohol (lsopropanol), or ethyl alcohol (Fotocol or Ethanol). Do not
use abrasive cleaners.

PROBE MODULE REPLACEMENT

• If the probe is damaged or fails, replacement modules are available through your local Tektronix Field Office or repre­sentative. The “Replaceable Parts List” at the rear of this manual provides the Tektronix part numbers and descrip­tions for the replacement modules.
• Modular construction has been incorporated in the de­sign of the P6120 to simplify repairs. The probe head, com­pensation box, and cable are available as wired units for replacement. To remove the probe head, pull the cable away from the probe head until they are unplugged. To remove the compensation box, first unscrew the retainer cover from the compensation box body. Then pull on the cable until it separates from the compensation box. Individual compo­nents within the probe head and the compensation box are not considered replaceable parts. To install new modules, reverse the above procedures.

REPLACEABLE PARTS LIST

A367-324
 |  | 3 METER PROBE|  |

-1

|

010-6120-05

010-6120-04

206-0280-00

|

PROBE,VOLTAGE:3M L,W/ACCESSORIES

PROBE,VOLTAGE:3M L TIP,PROBE:SLIP-ON

| 80009

80009

80009

| 010-6120-05

010-6120-04

206-0280-00

-2| 015-0201-04| TIP PROBE:IC TEST,PKG OF 10| 80009| 015-0201-04
 | 015-0201-05| TIP PROBE:IC TEST,PKG OF 100| 80009| 015-0201-05
-3

-4

-5

-6

| l  75-3217-01

206-0281-00

200-2547-00

210-1377-00

| CABLE ASSY,RF:39 OHM PER FOOT COAX,3M L COMP BOX:3.0 METER

. COVER,CABLE NIP:PLASTIC WASHER,SPRTNSN:0.16 ID X 0.01 THK,STL,0.22

| 80009

80009

80009

OD 86928

| 175-3217-01

206-0281-00

200-2547-00

A367-324

 |  | STANDARD ACCESSORIES|  |
-7|  

013-0107-04:

|

TIP,PROBE:RETRACTABLE HOOK ASSY

|

80009

|

013-0107-04

-8| 166-0404-01| TUBE, INSULATOR:| 80009| 166-0404-01
-9| 195-0950-00| LEAD,ELECTRICAL:23 AWG,8.812 L,0-N| 80009| 195-0950-00
-10| 016-0521-00| POUCH,ACCESSORY:| 05006| OBD
-11| 334-2794-02| 2 BAND,MARKER:0.371 DIA,SILVER GRAY,PLASTIC| 80009| 334-2794-02
 | 070-3392-0l| 1 SHEET,TECHNICAL:INSTR P6120| 80009| 070-3392-00

ABOUT COMPANY

• Manufacturer
  • TWENTIETH CENTURY PLASTICS, INC.
  • TEKTRONIX, INC.
  • SEASTROM MFG. COMPANY, INC.
• Address
  • 415 E WASHINGTON BLVD.
  • PO BOX 500
  • 701 SONORA AVENUE
• City, State, Zip
  • LOS ANGELES, CA 90015
  • BEAVERTON, OR 97077
  • GLENDALE, CA 91201

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