IO
TABLE 2-1
Os
S ig n a l C o u p lin g M e th o ds
M e th o d
A d va n ta g e s
L im itations
Accessories
Required
Source L oa d ing
See Fig. 2 -3 , In
p u t Xc a n d R
Curves
Precautions
1. Open (unshielded) test
leads.
Simplicity.
Limited
frequency
re
sponse. Subject to stray
pickup.
BNC
to
banana
jack
a dapter
(103-0033-00).
Two test leads.
1 M fi and 15pF a t input,
plus test leads and adapter.
Stray pickup and spurious
oscillations.
2. Unterminated coaxial
cable.
Full sensitivity.
Limited
frequency
re
sponse. High capacitance
o f cable.
C oaxial cable w ith BNC
connecfor(s).
1 M fi and 15 pF plus cable
capacitance.
High-capacitance loading.
3. I X / 1 MO probe.
Full sensitivity.
H ig h
capacitance
of
cable.
P6028 is 1 X equipped
w ith BNC connector.
1 M fi and
~
63 pF.
High-capacitance loading.
4. Terminated
coaxial
cable.
Termination
at
Type 1A1 input.
Full sensitivity. Total Type
1A1 /O scilloscope
band
w idth. Relatively fla t re
sistive loading. Long cable
w ith uniform response.
Presents R<> [typica lly 50
fi) loading at end o f
coaxial cable. M a y need
blocking
capacitor
to
prevent DC loading or
damage to termination.
Coaxial cable w ith BNC
connector(s).
R0
termi
nation a t Type 1A1 input.
(BNC 50 f i termination,
011-0049-00).
R0 plus 15pF at Type 1A1
end of coaxial cable can
cause reflections.
Reflections from 15 pF at
input. DC and AC load
ing on test point. Power
lim it o f termination.
5. Same as 4, w ith coax
ial attenuator a t term i
nation.
Less reflection from 15 pF
at termination.
Sensitivity is reduced (in
creased deflection factor).
BNC coaxial attenuators.
R0 only.
DC and AC loading on
test point. Power lim it o f
attenuator.
6. Tap into terminated
coaxial system. (BNC T:
US-274/U at Type 1A1
input.
Permits signal to go to
normal load. DC o r AC
coupling w ithout coaxial
attenuators.
15 pF load a t tap point.
BNC T and BNC connec
tors on signal cables.
1 M f i and 15 pF at tap
point.
Reflections from 15 pF in
put.
7. 1 0 X ,
10 M O
probe
1 0 0 X ,
10 MO
probe.
1 0 0 0 X , 100 MO probe.
Reduce resistance and ca
pacitive
loading,
nearly
full Type 1A1 Oscilloscope
bandw idth.
X0.1 sensitivity.
X0.01 sensitivity.
X 0.001 sensitivity.
P6006 P6008, P6010 are
1 0 X .
P6007, P6009 are 1 0 0 X .
P6015 is 1 0 0 0 X .
P6006
P6008
P6010
P6007
M fi.
P6009
P6015
SS 7 pF, 10 MSI.
~ 7.5 pF, 10 M fi.
SS 10 pF, 10 M fi .
less than 2 pF, 10
« 2.5 pF, 10 M Q .
~ 3 pF, 100 M fi.
Check
probe
frequency
Compensation. Use square-
w ave frequency less than
5 kHz, preferably 1 kHz.
8. 500 f i and 5 k fi probes
{must be terminated in
50 0 at Type 1A1 input).
Reduced capacitive loa d
ing to about 0.7 pF. Band
w idth th a t o f Type 1A 1/
Oscilloscope. Probe com
pensation need not be ad
justed, since effect is not
apparent when used with
the
Type
1 A 1 /O scillo
scope.
Resistive loading. X0.1 o r
X0.01 s e n s it iv it y . M ay
need blocking capacitor
to prevent DC loading
or dam age to termina
tion.
L im ite d
low-fre
quency response when
AC coupled: 70 kHz for
P6034; 7 kHz fo r P6035.
P6034-10X.
P6035-100X.
Items in Fig. 2-3.
P6034: 500
SI,
0.7 pF.
P6035: 5 k fi, 0.6
pF.
DC and AC loading. V o lt
age rating o f probe.
©
O
p
e
ra
tin
g
In
s
tru
c
ti
o
n
s
—
Type
1
A
1
