Tektronix P6405 User manual

COMMITTED TO EXCELLENCE
Instructions
P6405
010-6405-01
P6405 DATA ACQUISITION PROBE
OPERATOR'S PART
DESCRIPTION
The P6405 is a passive data probe used with the SA 501 Signature Analyzer to sample digital data
from various logic families. The Analyzer compares data from the probe with its own Threshold HI and
Threshold LO reference levels and then sends signals back to the probe to illuminate the appropriate logic
level lamp(s).
The P6405 contains:
• Two logic level lamps (red and green)
A preset compensation capacitor
• Slide switch (10 MQ or 50 kQ input impedance)
• Momentary contact switch (system reset)
• 1.5
meter cable
• 6
pin connector
Copyright tr; 1981. Tektronix, Inc.
070-3620-00
All right;. re,erved.
APRIL 1981

P6405 Data Acquisition Probe
Characteristics
Attenuation
Input Resistance
Input Capacitance
Maximum Input Voltage
Characteristics
Temperature range
Operating
Non-operating
Altitude
Operating
Non-operating
Humidity
Non-operating
Shock
Non-operating
2
SPECIFICATION
·Etectrical
Description
10X ±5%
Switch selection of:
-10 Mil ±5% to gnd
-50 kQ ±3% to 1.4 V
14 pF (approx)
±40 V de+ peak ac
Envirc11,mental Description
-15°C to +55°C (+5°F to +131°F)
-62 °C to +85°C {-80°F to +185°F)
to 4500 m (15,000
ft)
to 15,000 m (50,000
ft)
5 cycles, 120 hrs 95-97% relative
3o•c
to
60°C
500 g·s, Half sine 1ms duration

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Characteristics
Net weight (including accessories)
Length
Total
Cable
Connector pin identification
P6405 Data Acquisition Probe
Physical
113 grams (4.0 oz)
1.64 m
(64.5 in)
1.5
m (59 in)
Description
pin 1-Coax center cond.
2-50 kfl
(Switchable)
3-Red ind. light
4-Green ind. light
5-Reset Sw. sense
6-lnd. light common
Connector shell - coax shield.
3

4
P6405 Data Acquisition Probe
OPERATING INSTRUCTIONS
The P6405 data probe is designed to work with the SA 501 Signature Analyzer.
Data Probe Controls
1. Reset
Clears a single-event signature from the display.
2. HIGH/LO
Selects either: 1OMn to ground
50 kn to 1.4 v
Data Probe Indicators
1. LOGIC HIGH (RED)
ON indicates input greater than high threshold.
OFF indicates input less than high threshold.
Flashing indicates pulsing input transitioning through high threshold.
2. LOGIC LOW (GREEN)
On indicates input is less than the low threshold.
Off indicates input is greater than the low threshold.
Flashing indicates a pulsing input transitioning through low threshold.
OPERATING PROCEDURE
Connect the data probe to the SA 501 by inserting the probe's 6-pin Lerno connector into the Data
Input socket (marked P6405 on the analyzer's front panel).
Set the slide switch to the appropriate position for the unit under test.
• When the slide switch is in the 50 kn position, a 50 kn resistor inside the probe is connected be-
tween the probe tip and 1.4 V. Thus, the probe tip is biased to 1.4 V whenever the line being tested
is in a high impedance state. This keeps 3-state busses from wandering aimlessly when they are off.
When the SA 501 is set for TTL thresholds, it ignores a 1.4 V threshold voltage and, thus, will not be
triggered during a 3-state high impedance situation.
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@
P6405 Data Acquisition Probe
The Reset button pulls pin 5 on the Lerno connector high. When the SA 501 sees this line move, it
resets its CRC and character latches.
The green and red lamps are driven from the SA 501.
• The green lamp is lit whenever the input data goes below the LO Threshold.
• The red lamp is lit whenever the data signal goes above the HI Threshold.
STANDARD ACCESSORIES
A variety of items to aid in the use of the P6405 are provided as standard accessories
(see Accessories in the parts list at the rear of this manual).
5

P6405 Data Acquisition Probe
6
SERVICE
WARNING I
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.
INTRODUCTION
The P6405 is a passive data probe for the SA 501 Signature Analyzer.
Theory of Operation
The data input portion of the P6405 is made up of a thick film RC device plus a trimmer capacitor (C2)
and the coax cable.
The thick film device (R1, C1) determines, to a great degree, the impedance the circuit under test sees
at the P6405 probe tip. The total input resistance of the signature analyzer is made up of the 1
Mn
input in
the SA 501 and the 9Ml1 R1 making the total input resistance 10 Mr!.
A 50 kU resistor, R2, can be connected via switch S1 to a 1.4 V line from the analyzer. When connect-
ed to 1.4 V, this resistor pulls high impedance (3-state) lines toward 1.4 V, which is between the TTL HI and
TTL LO Thresholds on the SA 501.
The indicator lamps are long life, 5 V, 60 mA bulbs. They are driven by the SA 501.
Momentary s,""itch S2 connects pin 5 on the Lerno connector (reset sense line)
to
the lamp's common
line.
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P6405 Data Acquisition Probe
Performance Check and Adjustment
Equipment Needed
• Pulse Generator and appropriate termination.
Example: TEKTRONIX PG 502
• 100 MHz Scope
Example: TEKTRONIX 4658
• SA 501 with data input normalized to 1 Mn paralleled by 26 pF. (Normalization is done with the RC
Normalizer 067-1035-00).
• DC to 100 MHz, l0X Probe
Example: TEKTRONIX P6105
Performance Check
1. Remove the cover from the Input Board side of the SA 501 (the left side, when facing the front of
the instrument).
2. Install the TM 500 test equipment in a mainframe, making sure that the left side of the SA 501 is
accessible.
3. Turn on all the test equipment and let it warm up for 30 minutes.
4. Attach channel A (0.5 V/div) of the oscilloscope to the signal generator and set the generator for a
1 kHz square wave at 2 V peak-to-peak.
5. Connect the P6405 to the SA 501 and use the data probe to sample the 1 kHz square,wave.
6. Attach the oscilloscope channel B (50 mV/div) to A2TP1062 (signal)and A2TP1057 (ground) by
means of the P6105. Peak- to-peak aberrations caused by the probe and the SA 501 input should not
exceed 10% of the peak-to-peak signal on A2TP1062. (Note, the signal inside the SA 501 will be 1/10
that of the generator.)
7

P6405 Data Acquisition Probe
8
Adjustment
1. It the peak-to-peak aberrations are greater than 10%, do the adjustment in step 2.
NOTE
Before adjusting C2 to null out aberrations in the waveform, make sure that the SA 501's input
has been calibrated with an RC Normalizer, otherwise the problem may be in the SA 501.
Adjustment of the compensation circuit inside the probe to ciean up the input of an out-of-
tolerance SA 501 will make it necessary to readjust the probe while it is attached to another
SA501.
2. Calibrate tt,s probe by adjusting C2 with a smaii-tipped non-magnetic screwdriver tor minimum
waveform distortion.
Reassembling the Instrument
• Remove the scope probe and repiace the SA 601 s side panel.
MAINTENANCE
Because of the speciil fixtures required and the delicate nature of the internal assembly,
individual components w~th1n the probe head are not considered customer replaceable parts.
If the probe is damagedor fails, please return it to your local Tektronix Field Office or
representative for repair.
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P6405 Data Acquisition Probe
REPLACEABLE
PARTS
PARTS ORDERING INFORMATION
Replacement parts are available from or through your local Tektronix, Inc. Field Office
or representative.
Changes to Tektronix !nstrun,ents are sometiri:ies made to accommodate improved
components as they become available, and to give'"you the benefit of the latest circuit
improvements developed in our engineering department. It is therefore important, when
ordering parts, to include the following information in your order: Part number, instrument
type or number, serial number, and modification number if applicable.
If a part you have ordered has been replaced with a new or improvP.d part, your local
Tektronix, Inc. Field Office or representative will contact you concerning any change in part
number.
Change information, if any, is located at the rear of this manual.
SPECIAL NOTES AND SYMBOLS
X000 Part first added at this serial number
00X Part removed after this serial number
ITEM NAME
In the Parts List, an Item Name is separated from the description by a colon (:).
Because of space limitations, an Item Name may sometimes appear as incomplete. For
further Item Name identification, the U.S. Federal Cataloging Handbook H6-1 can be
utilized where possible.
ABBREVIATIONS
ACTR ACTUATOR PLSTC PLASTIC
ASSY ASSEMBLY QTZ QUARTZ
CAP CAPACITOR RECP RECEPTACLE
GER CERAMIC RES RESISTOR
CKT CIRCUIT RF RADIO FREQUENCY
COMP COMPOSITION SEL SELECTED
CONN CONNECTOR SEMICOND SEMICONDUCTOR
ELCTLT ELECTROLYTIC SENS SENSITIVE
ELEC ELECTRICAL VAR VARIABLE
INCAND INCANDESCENT WW WIREWOUND
LED LIGHT EMITT-ING DIODE XFMR TRANSFORMER
NONWIR NON WIREWOUND XTAL CRYSTAL
9

P6405 Data Acquisition Probe
\
Fig.&
Index
No.
1-
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
Tektronix
PartNo.
010-6405-01
010-64 05-00
344-0046-00
175-0124-01
175-0125-01
206-0254-01
166-0404-01
015-0201-04
206-0222-00
015-0325-00
016-0521-00
206-0252-02
070-3620-00
Serial/ModelNo.
Eff Oscont
REPLACEABLEPARTSLIST
Qty 1 2 3 4 5 Name& Description
1 PROBE,LOGIC:l.5M L W/ACCESSORIES
1 • PROBE,LOGIC:l.5M L
STANDARDACCESSORIES
2 CLIP,ELECTRICAL:ALLIGATORTYPE,W/COVER
1 LEAD,ELECTRICAL:PROBEGND,5 INCHESL
1 LEAD,ELECTRICAL:PROBEGND,12 INCHESL
2 TIP,PROBE:LOGIC,MOLDEDW/PLASTIC
1 TUBE,INSULATOR:
1 TIP,PROBE:IC TEST, PKGOF 10
2 TIP,PROBE:MICROCIRCUITTEST
1 ADAPTOR,PROBE:PROBETO CONNECTORPINS
1 POUCH,ACCESSORY
1 TIP,PROBE:P6405, SLIP-ON
1 SHEET,TECHNICAL:INSTRUCTION010-6405-00
CROSSINDEX-MFR.CODENUMBERTOMANUFACTURER
Mfr. Code Manufacturer
05006 TWENTIETHCENTURYPLASTICS, INC.
80009 TEKTRONIX,INC.
10
Address
415 E WASHINGTONBLVD.
PO BOX500
11
Mfr
Code Mfr Part Number
80009 010-6405-01
80009 010-6405-00
80009 344-0046-00
80009 175-0124-01
80009 175-0125-01
80009 206-0254-01
80009 166-0404-01
80009 015-02 01-04
80009 206-0222-00
80009 015-0325-00
05006 OBD
80009 206-0252-02
80009 070-3620-00
City, State, Zip
LOSANGELES,CA 90015
BEAVERTON,OR 97077
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3620-3