Tektronix P6046 User manual

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Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077
070-0756-00
Product Group SO
COMMITTED TO EXCELLENCE
PLEASE CHECK FOR CHANGE INFORMATION
AT THE REAR OF THIS MANUAL.
P6046
PROBE
AND
AMPLIFIER
INSTRUCTION MANUAL
Serial Number----
First Printing JAN 1968
Revised MAY 1986

Copyright if• 1968 Tektronix, Inc. AH rights reserved.
Contents
of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are covered
by U.S. and foreign patents and/or pending patents.
TEKTRONiX, TEK, SCOPE~MOBILE, and are
registered trademarks of Tektronix, Inc. TELEQU!PMENT
is a registered trademark of Tektronix UK Limited.
Printed in U.S.A. Specification and price change privileges
are reserved.
INSTRUMENT SERIAL NUMBERS
Each instrument has a serial number on a pa"el insert, tag,
or stamped on the chassis. The first number or letter
designates
the country of manufacture. The last five digits
of the serial number are assigned sequentially and are
unique
to each instrument Those manufactured in the
United States have six unique digits. The country of
manufacture is identified as follows:
8000000
100000
200000
300000
700000
Tektronix, Inc., Beaverton, Oregon, USA
Tektronix Guernsey, Ltd., Channel Islands
Tektronix United Kingdom, Ltd., London
Sony/Tektronix, Japan
Tektronix Holland, NV, Hoorenveen,
The Netherlands

l'ig. 1-L !'6046 Oiffenmlio! Probe t~nd Ampilfier For 1'6046.

:~
P6046 Probe and Amplifier
SECTION J
CHARACTERISTICS
Change information, if any, affecting this section will be found at the
rear
of the manual.
General Information
The P6046 Differential Probe is on active, duai input probe
designed for use with the Tekrronix Type 1 A5 Differentia!
Amplifier
or the "Amplifier For P6046". High common-mode
rejection ratios ore provided at high frequencies by per-
forming the common-mode rejection within the probe body.
Ca!ibroled vertical deflection factors
of from 1 mV through
200 mV /division (in 1, 2, 5 sequence) con be selected by
switching at the Type 1A5 or ot the Amplifier for 1'6046.
These deflection factors
can be increased to ten times. the
indicated amount through use of a calibrated Dual Atten-
uotor Head, which
is a standard accessory to the P6046
Probe.
The Probe and Type 1 AS combination has a 45 MHz
bandwidth when used with em appropriate oscilloscope. The
Probe
and Amplifier For P6046 combination has a 100 MHz
bandwidth.
This provides a 70 MH:t overall system bandwidth
when the Probe
and Amplifier ore operated into the singte-
ended input of any 100 MH:z oscilloscope having a vertical
deflection foetor of 10 mYjdivision.
The Probe has a 5-V common-mode operating ronge and
a 25-V maximum input which con be extended by o foetor
of ten through use of the Duo! Attenuator Head.
Charaderistics
A summary of the P6046 Differential Probe electrical char·
aderistics, and pertinent mechanical and environmental
characteristics
ore contained in Table l- L Specifications per-
tain to operation with both the Type l A5 and the Amplifier
For P6046, except where noted otherwise.
Fig. 1-2, l-3, and 1·4 contain graphs of common-mode
rejection ratios {CMRR) under different equipment setups ot
25"C. MINIMUM refers to the values required to meet spec-
ifications. TYPICAL indicates the approximate valves which
most probes will obtain.
Fig. 1-5 shows how CMRR varies os temperature deviates
from 25"C. For exomple, if the Probe is to be operated at
20"C to test a 50 MHz circuit, the spe<ified CMRR shoui~ be
multiplied by 0.95 to determine the minimum CMRR value
which may
be expected.
fig. 1-6 displays the effect that sou<ce impedance has on the
gain of the Probe
as a function of frequency. It can be ap-
plied to differential operation as follows: Relate the upper
graph to the display amplitude ""'- input signal when the
signal source impedances
are matched (up to a 5:1 source
impedance ratio); Re!o!e the lower graph to the display
amplitude
-:- input amplitude when the signal source imped-
ances
are greatly mis-matched.
Accessories
A number of accessories which extend operating capabil-
ities are supplied with the P6046 Probe and !he Amplifier For
?6046 as Stondord Accessories. These are listed on the last
page of the Mechcmicol Ports list.
An optional accessory which must. be used during Probe
calibration is listed in ~he Calibration section. Additional
miscellaneous accessories are listed in the Tektronix catalog.
All accessories can be purchased through the Tektronix Field
Office.
TABLE 1-1
CHARACTERISTICS
...
Characteristic Performance
Requirement at
25"C Supplemental Information
Step Response
With Type lAS
Bandwidth Risetlme
5 to 200
mV /CM
245MHz
:::;7.8 ns
'lmV/CM and 20mV/ ?:43MHz $8.1 ns
CM-Retained Range
----~
1 mV/CM and 10 mV/ >38MHz
S:9.2 ns
CM--·Retained Range
With Amplifier For P6046 Bandwidth Risetime
----~------
-·----··
-~--"--·-----~-~~-·------~-----~- ·-·"'-·~---------- ----
1 mV /DIV through 200
>lOOMHz
53.5 ns
Bandwidth
in
l and 2mV/D!V positions
mV/DIV decreases
to 90MHz at 50°C.
1-1

Ringing, Rounding, Over·
shoot and Tilt
With Type lAS
Head
--D"iff;cifon--f:c;-c:io;:- - -----
Basic {I Xl
wiih-lox""-l)~-c;r·;,:ttei~uofor
Head
Range
DC to 10MHz
Dual Attenuo!or Heod
:±:4% (S6% peok ro peak) in first 70 ns
::':::1
1 mV/div to 200mV/div calibrated in 1, 2,
5 sreps
+5 V {DC + peak AC) from overage
nai !eve!; not exceeding ±~5 V with
sped to ground
Input
----··------+-------------- -------~---
Probe
!OX Duol
lOX--D~oi"Attenuotor
·oc:-·rhermoro-;:iF----~---
Probe
Am-p~f;r _________ ·
1-2
o C ot Probe head
Percent of devio!ion soedfication increases
by 4% within the fir~t 10 m; at 0o C and
+50°C
1 mV /div through 2_500 mV /div l.mcoli·
brated with 1 A5
®

Churaeterittin-P6046 Probe and Amplifier
~
15
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With Type 1A5 I 200 t.N tongentiglly M;;!'QSvted i RMS value is approximately 1J
2 of the tan-
--WithA~pilf{;;-F(;~P6o46~·~·-~t2So p.V- rengentiuiiy-meo~orecr·--------··is~ntially measured value. Peak to peak
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Overdrive Recovery Time , I 5V Input
With Type iA5 i 0.15 p.s or less {to within 10 mV of DC j
!shifted level) !
wilh'A;:;pmier -For P6046-·-·-ra-:~-;~-o·~·I;;;$(io withi;TOmVof-DC sr;iftecn
i !eveij !
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Maximum Al!cwoble tnpvf ' 25 V toto! OC + Peak AC; 25 V toted dlf- i AC or DC-covpled
1 ference
betweM + and ~- Input tips 1
-~;1ftf~~~~~~~~~c:=~-~~-~~~+~~~fs~:\1r:~~;~;c;~~~~;--o~--~~--~=p~J-~~=~~§J~_ --==-~==~·=·=~~=--=~===
l +5" c !
----~-----------··---·--t-·----. ~----··-·---. -------·+---------------------~---~-·
Amplifier for ?6046 ! 90 to 136 V or 180 to 272 V AC, 50 to 1Chong$ power eonn~dions for ronge and
Operating Voiroge i 400Hz !vQitoge within range. See Table 4-3.
--~ ·--~. -•-4~- --··-~• --·~~·---~ ··~~--- --~-.~- ~.._-••·•·-~·~·---·---~-~---.-· .... -~--..........,..~>'"·.-•V-•·•--~- .. ~-------- •-•<-'<-• .--.. -~ __ _.,. -,<\' ~·-~·-~-_,,. ___ ,,_, ___ ,.....,.. _ ____.~~---~~ -~---·-·~- -~~ , __ ,
~mp•afure ! ;
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Non-operating 1-4Q"C to +o5"C
o-p-e,:atin9 ________ -----~- ---- ··n5"ct"o- +50"c
----···-·---·---···-~·-···-~--- .................... ·----4.----·----------------~-----------·-·-·--·-~-·-·-
Aititude j
Non-operating
l To 50,000 feet
i
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Non-~peroling Is cycles Mll-STD-202C, Method 1068, omit·
__ ···-·- ·-- .... ----~---~-·----- --------1-!!.~_fre~~~-o~ .. v ___ ib ___ r __ o __ tio_n ___ ......... ..:------------·--+------··-··-· ___ .. _____ ..... _--·-·-----·-·--···-------- ..
Vibration ,
Operating l1s minutes each oxis at 0.015 inch. Fre·
lquency varied from 10-50.10 c/s in 1-min·
i ute cydes with instrument secured to vibra·
Non-operating
Probe Body
Amplifier
ticm pkltform. Three minutes eoch oxi; ot
reso~!:!..J:~i~_?!~~t_SO __ :... ..... --·-·--·-•-----·-
400 g's 1
/'" sinai 6 shocks along
tri::Huvers!ll'
axis at
1
/2
ms, i ms and 2 ms duration
(toto! of 1B :shocks); 3 oddltionol shO<:ks in
longifudinol axis or Y
2
rns, l ms and 2 ms
(toto! of 9j
200 g·s, V
2
si~, 3 ms or 7 ms durotion:
3 shoth eoeh direction cdong the 3 maior
axes for o toto! of 18 shocks
··------!---·--·-
1-3

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FREOIJENCY

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I'!U!QIJENCV
f!g. 1~3, Typkol 1"6046 CMI!:R: versus fr~>quency for 50 mV !lm:n;gh 700 mV divl$ion at 75° C. Alu> 1:1pp!les to Hl and 20 mV-Ih>talmrd Range
positiont of Type 1A5.
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NOTES

P6046 Probe and Amplifier
SECTION 2
OPERATING INSTRUCTIONS
Change information, if any, affecting this section will be found at the
rear
of the manual.
CAUTION
Operating the P6046 Differential Probe without
a common refer~nce (ground I between it and the
unit under test may deslroy components in the
Probe input circuitry. Connect o ground lead from
the probe grounding lug to the equipment to be
tested before touching the Probe to the equipment
or its test iocks.
Introduction
The P6046 Differentia! Probe is essen!ioi!y a differential
amplifier with unity gain. Proper operation of it is de-
pendent upon a bosk knowledge of differeniioi principles.
A summary of these principles therefore precedes the op-
erating instructions.
GENERAL DIFFERENTIAL
AMPliFIER INFORMATION
An oscilloscope with o differential amplifier is o dev1ce
that amplifies and displays a voitage difference which
exisls of every instant between signals applied to its two
input cormectors. The following condusions con be drawn
from this definition.
!. If the two signals ore in phose and of equal ompli·
lude (hereafter coiled common mode), the output wHI be
zero.
2. If the two signals are in phu:>e but of different ampli-
tudes, the output
will equai the amplitude difference.
3. If the two signals are out of phose and of eqvol am-
plitude the output wil! be the phasor difference between
the two signals {sinusoidal signals).
4. If the two signals ore out of phase and of different
omplirudes, the output signal will be a complex quantity
d$rived from both amplitude
and phose differences.
Common Mode Rejection
The definition of the term ''differential amplifier" implies
a rejection of equal ompiitude, coincident signols. This
implication is correct However, the degree of rejection de-
pends prirr<Orily on the symmetry of the amplifier inputs.
The amount of difference signal .;:ontributed by o particular
amplifier at a specific freqvency is documented with o math-
emotkol relationship that is coiled the common-mode re-
jection rotto {CMRR). This ratio and associated terms ore
defined as follows:
Common Mode-Refers to signals that are identical in
both amplitude cmd time. It is olso used to idvntfy the
respective parts of iwo s!gno!s that are identical in am·
plitude and time.
Common-Mode Rejf!dion Ratio--A mtio which expresses
t·he efficiency of a device in preventing common-mode ~ig
nols from affecting its output A differential amplifier, like
all other things, cannot b!ll {l perfed device. Some output
sigm::C however small, always ocwrs in response to com·
mon-.mode signals appH~;~cl to the two inpu~s. !n any spe·
cific ins!once, an output resuliing from appiicafi011 of com-
mon-mode signals can
be duplicated by grounding one
input ond appl)'ir'lg a specific size signoi to rhe second
input. The comparison
of the common-mode signal to the
single-ended signal
!s the Common-Mode Rejection Ratio
of the device. See 2-L
~·
O.Stt.V
pec~·io;:~eok
...__ ~ V peok-to-~k
signal
{Al CI<Jipuf ;;av~ by lrrub!llty to cort~p!..,tely
re!ed ;;ommon-M~ sipo!1>, +
0.5mV
peok-to-peoir
-:: signal
~
t.UmV
peak·to•fH~ak
Ill !iq~Ji\ll:llent outp11t t;<:Jvsfl'll by ~ingle-enelll>d
$I!Jnctl.
sv
0.5mV
!Cl CM!Ut = ratio of all!pl!tude of <ommon•
mode signal (Al to ttmplitlld& of single-eru:lE<tl
signal lil wltleh produ;;&$ equivalent result$.
NOTE
Since the differential amplifier is part of an oscil-
loscope,
the output signal used to cokulote the
CMRR is meosured from the CRT display and
VOlTS/CM switch setting.

Oper<:~ting lnstrud!ons--P6046 Probe and Amplifier
factor·s Which Affect CMRR
frequency. Since the common-mode rot·io is
affected by the gain and phase shift introduced by the t\'io
sides of the amplifier, the frequency of the fnput common-
mode 'iignal has a direct bearing on the CMRR. Genert11-
ly, as the frequet1C)' of the input signal increases, the CMRR
decreases. (E~ception: with AC-coup!ed inpuis the CMRR
will become higher as frequ(~tKy ls increased from DC to
over 1 kHz).
Souree impedance, To obrain optim11m Ol!RR, points
being measured rrwst hove identical source ~mpedoncc. The
source
impedance ond lhe tlmpHfier input· irnpedcmce form
an RC divider which determines the por!km of the sifmol
thof appears across the ompllfier inpvt. Uneqvai source
impedances show up as an apparent decreose in CMRR.
Signal Transporting legds. The inpvt conneoors of a
differemiol Oi'Ylp!ifier ore usually remole from the octuo!
signal source.
Evon with o portable ampltfier such cs the
P6046 Probe, some transporting of the signal :s from
the source h:) connectors 'which are compatible with the
Frobe inputs.
Several undesiroble effeds con
b,~ inrrodvced by trans-
porting leads. if they me unshielded, stnly pick•Jp will
occur. Differences between rhe stray pickup in the two ieads
will be occepl·ed by the diffenmtia! amplifier as slgncis.
The capacitance of unshielded lead$ is relatively vnpredid·
able and will vary wirh the lead location. AC signals will
be affected by this (espeda!ly at high frequencies), and a
difference
between the sovn::e signa! and thal delivered
to rhe differential amplifier will occvr. Unless the introduced
difference is equal in both leads, ihe amplifier will again
see a differentiol :;ignol that is not oduo!!y present at the
sovrces. See Fig. 2-2.
The capacitance of shielded wbles aHcds signo!s, just
os ir does in unshielded leads. However, the ct<pacitance of
shielded cobies is known ond can be kept relatively equaf
by marching rhe lwo signa! cab!es in every respect. The
cables should normally be short to k._c,ep their capacilonce
(JS low as possible.
Signal tronsportin·g cables con oiso affect rhe source sig-
rml by causing rdlections, These ref!edior.s con be eiiminat·
ed by terminating the cables ;n their chorm:teristit imped-
ance unless prohibitive souro;-!oad!n~J would result.
Attenuafors. Any devku {such os c:opodtors or resistors)
connected between the source oncl rhe omp!ifier, unless per-
fectly matched, wiii also cause additional differences be-
tween i·he or the amplifier. Altenuators therefore
normol!y iower a system's common-mode re)ection capabil-
ities. This is illustrated in Fig. 2·3 ond its accompanying
tab!e.
Ground Connections. In addition to providing o com-
mon reference for
safety reasons, proper ground connec-
tions
ore essential for eliminating signal interfer.~nce caused
by ground loop currenrs. Ground leads should be as short
as possible In all instances. A ground lead ;hould accom-
pany each signal lead to the proximity of the test jack.
The shield of the signal's r;ooxic;! cable is uwali~· used for
thi:. purpose,
Probe input tips very often ore ocddentoHy touched to
equipment grovnd during Insertion into test jocks. lf ~uf
fic!ent difh.:rence exists between the differential omo!if:er
reference cmd reference for lhe eq,;ipmont .
va1vobie inpui components con be desiroyed. Proper grot•nd-
ing wil! ohc eiin;irKJte ihis problem
P6046 DIFFERENTIAl PROBE
CONTROLSs CONNECTORS
AND ACCESSORIES
The ?6046 Probe and accessories ore shown in fig. 2-4,
The P6046 Probe has an Amphenol power ond signol con··
nector,. duo! ~ignal input tip~, and an AC-DC Input Cou-
piing switch which controls the mode of ·for both
lips. Accessories and their uses are as follows:
l. Dual 1\tlerwator Head-··-Provides 10 :X: aHenuotkm of
signals <lpp!ied to its i:1puis. Attaches dircdly to P6046
Probe tips.
Has St1!l1i~ lip configuration os the Probe,
.2. Swivel Tips-·-S!eeve-type connectors ·which fit individu-
ally over probe tip inpur •:onr>ectors. Not eqvipped with
coaxial ground connedors. They adapt the probe tips to
terminals whose spacings ore be!v.•een lf;
6
and 1% inches.
3. Spring Ground Clip--.Clips to coc:xio! grovnd at probe
tip. Equipped with wire-soldering lug.
4. Specie! Ground Tip-·-Sleeve-rype adapter. inrernoHy
short lo ccoxiol ground connection_ Adapts Probe for
single-ended opero<ion. A common ground connection be-
t'Neen the Probe cmd the equipment 1.J11der test is sti!! re-
quired.
5. Tesl
Jocks--Coaxial female ccnnectorsi normally in-
slaHeci permanently into or near the equipment being tested.
Spadng should conform to the
1
/2 inch tip spacing. {If
the
swivel tips ore used with the probe, additional spocmgs are
possible. lt should be nc>ted that no cooxiai ground con·
!od acc.ompanies the swivel tip.) The test jacks can be in-
stalled by drilling holes through the selectt1d mounting
piate, insetting the rhreaded end through from the front
of the plate, and fastening the test jack in place with o nut
ar.d star washer. A soldering lug can be fastened between
the nur ond the back of the piat1J to fadlitote the making
of ground connections.
6. AHigotor Clip--Threaded for use wirh ground !eads.
7. Hook Tips-·Sleeve-fype connectors which fit indivldu-
over pmbe tip input connectors. Facilitates "h<mging"
the Probe into circuitry.
8. !nsuloting Tube---·Sleeve-typ<: odopler for ins!iloting :he
l·ip"s cooxiol ground. Permits vse of rip in dose quort<~rs
with minimum danger of causing o short circuit.
9. 12-inch Ground leod·--Same os 5-inch .. except that it
should be used only when the 5-inch will not reach.
l 0. 5-inch Ground lead·--·Equipped with a spring dip
on one end inhonded !o snap onto !he Probe gr<:Hmd lug;
machine screw on the other end for attachment to em alli-
gator dip. If should be connected bet-ween the Probe grou11d
lug and the equipment being tested before the Probe is
connected to the equipment.
®

!Al
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lndw.tctn(e '
of 1/4 in€h ~
#22 wi~ '
as 1.1
EQUIPMENT
UND!!t TEST
~ 1000:1
v
Amplifier For P6046
+ Input
1 MH:c
The Amplifier For P6046 is an optional P6046 Probe ac-
cessory consisting of r.m Amplifier vnit and a Power Supply
unit See Fig 2-4. Jt makes the Probe compatible with
any oscilloscope ond plug-in combination which has 10
mV /div deflectlon capability and appropriate bandwidth.
Operating it into o less sensi!ive device (higher rnV /d!vl will
provide unreliable results because of overdriving the Probe
oncl Amplifier. Operating it into o more sensitive device
can produce
some usable results if proper consideration
is given to the signal-to-noise roiio.
Operating instrudions--P6046 Probe and Amplifier
\S!
EQUIPMENT
UNDER TEST
lOMH:c 100 Mtb
The Power Supply unit attached to the Amplifier For
P6046 must be wired to conform with the source vohoge.
Three ranges are available in the vicinity of 115 V-AC, ond
three ore available in the vicinity of 230 V-AC. Connedion
instruciicm ore contained in the Maintenance section.
The Amp!ifitrr For P6046 comes
equipped with the fol-
lowing accessories:
An 18 inch 50 n coaxial cable with which to couple its
output to an oscilloscope input connecter.
2-3

Operating lnstructions-P6046 Probe and Amplifier
.
orst case
,ff,.,a!'lc.w
!>"tween
Probe A and
!'rob~> fl
1%
(0.5 ~t,
uuhtors)
2% ! 1
~~
resls!orsl
HI% 15% resislor$1
-·
by probes
111,1
55:1
ll:i
Fig, :2-3. Simptff;"d drcui! showing the !iml!aH<>t> in CMRR !hal· n
diff""''"'' be:tween <:>llenuutor pr<>bes t<m inlrod•ne. Oiffare"~"s
belw~:~en probe c<:~j><::Cilan<es add to !he effe<! <>n AC signals.
A 50 n BNC :urninalion with which to terminate the
Amplifier output.
A honget bracket which can be mounted at a convenient
location or; the side cover of lhe mciiloscope with whic>l
it is used.
HANDliNG THE PROBE
The P6046 Differential Probe is made m rugged os pes·
s~bie wihcL'i sacrificing pcrfcrmonce or portability Hew·
ever~ ii·s sensitive circuH·ry; small size 0!1d rnakc
necessary the use of scme cavrion in its Us~.~
no:-:nai care ro ClVOid severe mcchan;co! shocks lo the de~
vice, and do r.ot subiect the to voita~jCS in excess
of its breokfjOW'' values. II 1;, that points ro be
checked be te>ieci with oncth;:;r device to :nsure !hat volt~
ages do not exceed ihe P6046 Probe capabilities.
OPERATING PROCEDURE
The P6046 Probe is designed ro operate either with o
Type 1 AS Differential Amplifier P!ug·ln Unit or with an.
Ampiifier For P6046 ·whose output is connected 'o on os·
ci!loscope having o 10 rr.V vcrtlco! sensitivfty· ord a11
appropriate bcE1dwidth. This C•.:JVcr> both situc·
i!ons. It includes seiting up the eq1;ipmcnt, performing
operator checking goin ;hrou9h single·ended
cpt:ration} co:nmon··;"t10de rejcc~ion"" AC¥
covp!ed operatiof1 ard otrer1uator operatiofl, o;ffen:nt!cd
operation ond external triggering operar;on ir.forrnation is
a~so iridtlded. Pertinent tT·e contained olen~;
with to improve operat:ng re>vlts.
2-4
Equipment Required
The fo!iowir.g equipment is recommended for use ;n this
operoting procedure.
Tektronlx Type 544, 546, 541 or 556 A
580-series may be tJsed if it is equipped
with a Type 81 A Plug~ in Adapter. (If the .Ampi1f1er
For P6046 io to be used 'Nith ihe P6046 Probe, any
and plu(lin combir.ation having o vertical
deflection factor of 10 mV I div and an opprcpriore
bcmdwicHh can be substituted.)
Type 1
AS Differential Amplifier Plug~ in Unit. re-
quired if the .Amplifier For P6046 :s to be used with the
P6046 Probe.)
Amplifier for P6046 and Stondord Accessories; T'2!ktronix
Part i'h 0!5~0106-00. (~._Jet required if a Type 1A5
Differential P!ug~ln Unit is
P6046 Differentic1l Probe, Dual Attronuator Heed, or-d
S'andard Accessories.
Probe Tip-to-GR Adopter, Tektronix Part No. 017.007600.
GR-lo-BNC Mo!0 Adopter, Tektronix Part !'-lo. 017-0064-00.
50 r2 Termination, Tektronix Part No. 01 Hl049·01.
\Not required if the Type 1A5 is to be used./
Probe Duel Female Adopter. Tektronix Part
r...Jo. 067-0562-00.
42 Inch Coaxial Cable, Tekironix Parr No. 012.0057·01
Operator Adjustments
An attenuator balance adjustment is available at both the
Amplifier For P6046 (ATTEN BAL), and the Type 1A5
(PROBE STEP
ATTEN SAL) to eliminate trace shlfts which
might otherwise accompany switching from one deflection
factor to another.
The High Frequency CMRR should always be checked
{refer to Section 5, step 10) and adjusted, if necessary after
the probe has warmed up. The HF CMRR adjustments
(R209, C209, and C245) are accessibie through the probe
cover (refer to Section
6, step 1 0).
The exposed in the Dua: Attenva:cr Head
h;:we been focrory·cc'ibrated to !he f'robe wi•f; which the
Head i:; No further adivstmenl should be
unless the Head is used with a different Probe. In thor
eveM1 the attenuotor coiibmt!cP procedure contained in
rhe Calibration sec:ion should be accornplisf:ed.
CAUTION
'1. A common ground must always exist between
the P6046 Probe and ony equipment with which
it is being. u>ed. A ground !ug is built into l he
Probe, and ground leads me supplied as stand-
orcl accessories for ground purposes.
2 ~ Moxirnum allowable single-ended input is
± 25 V DC + peak AC with respt<ld to Probe
ground.
3. Maximum ai!owable difference between voltages
at tips is 25 V DC + peak AC.
riEV MAR 191.35