New Material Copyright © 1961 by Tektronix, Inc.,
Beaverton, Oregon. Printed in the UnitedStates of America.
All Rights reserved. Contents of this publication may
not be reproduced in any form without permission of
the copyright owner.
070-321
OPERtlTi
IG
mNSYRUCTION$
Gener«l
The P601g probe was developed to provide
a means of observing waveforms of high
amplitude on a conventional oscilloscope. The
1000:1 attenuation factor incorporated into the
P6013 enables the user to observe waveforms
or pulses with a peak amplitude of as much
as 12 KV up to 100 KC in frequency, or DC
voltages up to 12 KV without damage to the
probe or the oscilloscope.
Gener«a Descripfion
The P6013 Probe is designed for electrical
and mechanical protection of its internal com
ponents, and is covered with tthermoplastic
offering high impact strength. Weight of the
probe alone is 10 ounces, and of the probe,
cable assembly and compensating box together,
18 1/2 ounces. The 10-foot cable has a resistive
center conductor, with the value of the resistance
chosen to provide optimum performance of the
probe. The cable assembly may be removed
and replaced. UHF connectors are standard
on the P6013 probe.
COMPENSATUNG THE PROBE
The electrical components in the Compensat
ing Box of the Type P6013 probe include four
variable trimmer capacitors and two poten
tiometers. The RC networks in the box are
arranged to affect the observed shape of the
waveform at different but overlapping points
during the first 300 / seconds of the pulse.
Five of these adjustments compensate for
variations in input capacitance from one instru
ment to another. For accuracy in pulse and
transient measurements, the probe should be
checked frequently.
To check the probe, connect it to the INPUT
connector of the oscilloscope. Set the calibrator
control for an output signal of suitable amplitude.
Touch the probe tip to the CAL. OUT con
nector, and adjust the oscilloscope controls
for a display of several cycles. Optimum
response is indicated by aflat-top square-wave.
E|ectr[cam Ch«racter[sfics
Attenuation I000:1
Input Impedance I00 megohms, 3 pf
Risetime (with Type 545 14 nanoseconds
Oscilloscope and Type
K Plug-in)
Maximum Voltage Rating (below 100 KC)
Max. DC 12 KV
Max. Peak Pulse 12 KV
Max. Peak AC 12 KV
Maximum Voltage Rating (above 100 KG)
feier to Derating Curves, page 2.
Attenu«tion-°AH modeßs w[th R8@17
Before compensating the probe, the attenua
tion of the probe taust be checked. To do
this set the VOLTS/DIV. of the oscilloscope
or plug-in to .05 V/DIV. and theCALIBRATOR
control to 100 volts. Touch the probe tip to the
C AL. OUT connector and check for two major
graticule divisions of deflection on the crt
screen. If the deflection is more or less than
two major divisions adjust R8017 unti1 exactly
two major divisions are obtained.
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To compensate the probe, start by first
adjusting the screw labeled " 1" in the lower
leit hand corner of the compensating box.
This setting affects the front corner and general
level of that portion of the waveshape that can
be compensated--in other words, the first
300 microseconds of the waveform. After
posittoning the front corner
adjust the remain
ing screws, moving clockwise around the face
of the compensating box in numerical order.
Adjusting screw no. 2 affects the waveshape from
.5 to 100 microseconds. No. 3 affects the
waveshape from 2 microseconds to 120 micro
seconds, and the fourth screw affects the
waveshape from 5 microseconds to 150 micro
s econds. Since there is interaction between
the adjustments of the trimmer capacitors,
it will be necessary to repeat the sequence.
Circuit troubles that might be expected in
the Type P6013 generally fall into three
categories. The troubles and their remedies
include:
(i) Open center conductor in cable. This is
found by connecting the UHF connector on the
Compensating Box to the INPUT connector of
the Oscilloscope plug-in and touching the probe
tip to the C ALo OUT connector, An open center
conductor is indicated if no signal appears
on the Oscilloscope screen with i00 volts out
of the Calibrator, Replace cable assembly°
A variable peaking resistor (R8012) is pro
vided to compensate the first .3 microsecond
of the waveshape. To make this adjustment,
the cover of the compensating box taust be
removed. AdJustment of this resistance requires
the use of a Tektronix Type 105 Square-Wave
Generator, or another square-wave generator
capable of producing a pulse with a risetime
of 15 nanoseconds or less.
If the compensation ha8 been properly adjusted
for an oscilloscope of 20 pf input capacitance,
adjustment for another input capacitance can
generally be achieved by readjusting the first
screw only,
(2) Open 99.8 megohms resistor in probe
body. This results in AC coupling and is
indicated by decay of the CALo signal° To
replace the 99.8 megohms resistor, dismantle
the probe by unscrewing the handle and push
ing the metal barrel out of the body cover.
Then remove the screws from both ends of
the barrel and slide the nose and base assembly
out. Insert the replacement nose assembly into
the base assembly, belng sure that the metal
capacitor fingers of the base assembly fit
properly tnto the eccentric cIrcular slots in
the hose assembly. Do not bend the metal
fingers any more than absolutely necessary In
getting them inserted tnto the slotso When
this has been done, retnsert the base and nose
assembly into the barrel. You will nottce that
at the nose end, the nose assembly has six
screw holes in the lIght-colored plasttcportion
whIle the barrel has only three screw holes.
This is for compensation purposes. When the
nose and base have been re-inserted in the
b arrel
line up the screw holes at the hose
end, and while holding the assembly firmly
together as shown in Fig. (2)insert one screw
and snug it down firmly. At the base end,
insert the three screws in the slotted holes
but do not tighten them clear down yet.
the nose end of the probe and rotating the nose
assembly within the barrel to the next position.
This should enable you to completely compensate
the waveform to a perfect square ware. When
compensation is completed in this manner,
insert the remainder of the screws in the nose
end and tlghten down a11 screws at both hose
and base. Re-insert the barrel into the probe
body and again test the ware shape with a
CALo slgnal. Minor compensations of the corn
pensating box may again be necessary after
complete re-assembly of the probe.
Connect the probe for use and insert the
tip in the CAL. OUT connector. Compensate
the waveform as nearly as possible with the
trimmers in the compensating box. If a dip
or rise continues to appear in the waveform
beyond the portion compensated by No. 4 screw,
this can normally be compensated by rotating
the base portion of the internal probe assembly
using the two screw heads in the base to turn
it. It is possible that complete compensation
can only be done by removing the screw from
Accessories $uppUied with Probe
B anana Plug Tip
7 inch Ground Strap
Alligator Tip
Accessories thŒt
Special wrench 7/16 one end and 1/2
other end. For disassembly purposes.
3) Open connection in compensating box.
This is indicated by an obvious error in attenua
tion ratio. Open the compensating box by
removing the four screws in the corners of
the cover. Replace or reconnect internal com
ponents in the conventional manner.
134-016
175-192
344 -033
ay be Purch«sed
003-211
TYPE PöOIa PROBE
YAB EL[CTRmCAL PART$
Ckt.
No.
C8013
C8014
C8015
C8016
R8010
R8011
R8012
R8013
R8014
R8015
R8016
R8017
Torold
Mode1
No.
All
All
All
All
All
All
All
All
All
Last part
of Model
I and all
of Model
2.
Last part
of Model
I and all
of Model
2.
Value
Description
80-480 pf Mica Var 500v
9-180 pf Mica Var 500v
9-180 pf Mica Var 500v
80-480 pf Mica Var 500v
99.8 meg
lk
500 fa
34k
25.6 k
25.6 k
20 k
See Mechanical Parts Table II
Comp 1/2 w l0B
Comp Var 20
Prec 1/2 w 1
Prec 1/2 w 1
Prec 1/2 w 1
Prec 1/2 w 1
10 k Comp Var 20
See Mechanical Parts Table II
Tektronix
Part No.
281-044
281-023
281-023
281-044
302-102
o
o
o
o
o
o
311-150
309-129
309-136
309-136
309-153
311-245
Item
No.
1
2
3
4
5
6
7
8
9
10
11
12
Model
No.
All
All
All
All
All
All
All
All
All
All
All
All
TABLE Im MECHANmCAL PART£
Part Tttle
Probe Body
Nose Assembly with 99.8 meg
Metal adjustment arms
Inner Body, Alum tube
Cable Assembly
Handle for probe
Compensator houstng cover
Compens ator chassis
Red flber toroid retainer
Connector UHF
Toriod core (2 needed)
Compens ator housing
Tektronix
Part No.
204 -036
206-033
015-023
205-006
175-188
367-017
200-201
441-309
200-217
131-176
276-519
432-027
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