Model
6105
Resistivity Adapter
Instruction Manual
Contains Operating and Servicing Information
Publication Date: October 1972
Document Number: 31415
WARRANTY
Keithley Instruments, Inc. warrants this product to be free from defects in material and workmanship for a period of 1 year from date of
shipment.
Keithley Instruments, Inc. warrants the following items for 90 days from the date of shipment: probes, cables, rcchargcablc baitcries,
diskettes, and documentation.
During the warranty period, we will, at our option, cithcr repair or replace any product that proves to be defective.
To exercise this warranty, write or call your local Keithley representative, or contact Keithley headquarters in Cleveland, Ohio. You will
bc given prompt assistance and rctum instructions. Send the product, transpot%~tion prepaid, to the indicated service facility. Repairs
will be made and the product returned, transportation prepaid. Repaired or replaced products are warranted for the balance of the origi“al warranty period, or at Icast 90 days.
LIMITATION OF WARRANTY
This warranty dots not apply to defects resulting from product modification without Keithley’s express written consent, or misuse of
any product or part. This warranty also does not apply to fuses, software, non-rechargeable batteries, damage from battery leakage, or
problems arising from normal weas or failure to follow instructions,
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. THE REMEDIES PROVTDED HEREIN ARE
BUYER’S SOLE AND EXCLUSIVE REMEDIES.
NEITHER KEITHLEY INSTRUMENTS, INC. NOR ANY OF ITS EMPLOYEES SHALL BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF ITS INSTRUMENTS AND
SOFTWARE EVEN IF KEITHLEY INSTRUMENTS, INC., HAS BEEN ADVISED IN ADVANCE OF THE POSSIBILITY OF
SUCH DAMAGES. SUCH EXCLUDED DAMAGES SHALL INCLUDE, BUT ARE NOT LIMITED TO: COSTS OF REMOVAL
AND INSTALLATION, LOSSES SUSTAINED AS THE RESULT OF INJURY TO ANY PERSON, OR DAMAGE TO PROPERTY
l-l. GENERAL.
SECTION 1. GENERAL INFORMATION
a. The Model 6105 Resistivity Adapter is a guarded
te*t fixture for measuring volume and surface resistivities af materials when used with a regulated power
supply and an eleccromecer. The complete sysc?m permits measurement of volume resistivicy from 10 c0
3 x 1019 ohm-cm and surface resiscivicy from lo3 co
5 x 1018 ohms, in accordance with procedures of cbe
American Society far Testing and Materials. The
Adapter can accommadace samples up co 4 inches in
diameter and 114 inch chick with excitation voltages
up to 1000 volt*.
b. The Model 6105 has been designed c0 minimize
measurement error.
form co the ASTM recommendations for measurement of
electrical resisrance of insulating materials. The
test sample is shielded co prevent stray pickup. The
guard ring circuit is arranged c" minimize ieakage
currents from the measuring circuit. Uniform pressure
is always applied over the measuring area, because the
cesc sample is held beween the spring-loaded, guarded
electrode and the ""e-pound cesc weight assembly. Due
co these cansideracions, measurement accuracy depends
primarily upon the accuracy of the voltage source and
the electrometer.
C. Recwmended inscrumencs for "se with the Model
6105 are the Keichley Model 240A Regulated High Voltage Supply and the Keichley Model 610C Multi-Range
Electrometer.
volcages up c" 1200 volts in calibrated one-volt steps.
Ifs oufput is accurate within 1%. The Model 61OC pro-
vides direct reading current ranges c" lo-l4 ampere
full scale.
ampere, and f4% of full scale beyond. Although the
Model 240A and the Model 610C are the reccmmended
instruments for "se with the Resistivity Adapter, the
Model 6105 is compatible vich.all Keithley high voltage
supplies and electrometers.
Its accuracy is fZ% of full scale f" 10-11
The electrode configurations con-
The Model 240A provides excicacion
SAMPLE SIZE: Maximum:
Minimum:
SAMPLE THICKNESS: l/l6 inch co 114 inch (0.159 cn
to 0.635 cm).
TEST VOLTAGE i&GE: 1 volt c" 1000 vales.
MAXIMUM TEST VOLTAGE:
""LUME
SURFACE RESISTI"ITI RANGES: lo3 cr, 10IS ohms.
CmNECTORS: Power: Teflon insulated uhf-type
"IMENSlONS: 6 inches wide x 4-l/2 inches deep x
NET WEIGHT: 3 pounds.
RESISTI"ITY RANGES: 1.5 x 102 to 1.5 x 1018
ohm-inches (lo3 co 101' ohm-cm).
Electrometer: BNC-type recepcac1e.
4 inches high.
FIGURE 1. MODEL 6105
4-inch diameter (10.2-a
diameter)
Z-l/Z-inch diameter (6.3-cm
diameter)
1000 "OlCS.
receptacle.
SECTION 2.
2-l. PREPAEATION FOR USE. The Model 6105 is shipped
with two thumb-screw fasteners holding the test weight
to the guard ring. Remove ehese fasteners and store
for later use.
they should not be used during measurements. In
mounting the sample for measurement, make sure there
are no conductive paths between the electrodes other
than those through the sample. The sample should be
supported from the electrodes so that the elecrrodes
do not touch anything excep,t the sample. Do nof handle
the sample with bare fingers; acetate rayon gloves are
recomended.
faces with an alcohol and ether mixture or'other suitable solvent.
a. Volume Resisrivity Measurements. Place the
short circuit plug o"er the upper wo jacks, leaving
"VOLITME" clearly visible. Inserf the banana plug from
the fest weight assembly into the bottom jack. Close
the Model 6105 cover. An interlock switch disconnecrs
the potential to the sample if the co"er is opened.
Apply the power supply voltage. Read the current on
the electrometer. The value of the volume resisrivity
p, is found through one of the following calculations:
where p is the volume resistivity of the sample;
V is the applied voltage from rhe parer supply
in volts;
ti is the average thickness of the sample in
inches;
tc is the average thickness of the sample in
centimeters; trometer .
I is the current reading from the elecrrmerer.
These are used only for shipping and
For best results, clean the sample sur-
3.53 v
p = x ohm-inches
I
_ 22.9 v
ohm-centimeters
% 1
b. Surface Resisrivicy Measurements. Place the
short circuit slug over the lower two iacks, leavina
"SURFACE" cle&ly-visible. Insert the-ban&a plug I
from the fesf weight assembly into the top jack. Close
the Model 6105 cover.
age. Read the current on the electrometer. The value
of the surface resistivity is found through the following calculation:
where 0 is the surface resistivity of the sample;
V is the applied voltage from the power supply
in volts;
I is rhe cu+rent reading from the electrometer.
2-2. CONNECTIONS. Connect the power supply to the
uhf-type recepracle. Connect the electrometer to the
bnc-type receptacle. Place rhe sample under the test
weight
should be between l/l6 and 114 inch (0.159 and 0.635
cm). The diameter should be beween 2-l/2 and 4 inches
(6.29 and 10.2 cm).
2-3.
menc Of a sample. The test sample is placedabeween
the two electrodes; the desired test potential is
selected from the voltage supply and the current passing through the test sample is measured by the elec-
the electrometer, the resistiviries can be computed.
as shown in Figure 5.
PROCEDURE.
From
readings from the voltage supply and
Apply the power supply "olt-
The sample thickness
The Model 6105 Demits eas" measue-
I
118
in.
.31 cm. I
FIGURE 3. DIMENSIONING FOR MODEL 6105 ELECTRODES
2
1
SURFACE
RESISTIVITY NOMOGRAPH RESISTIVITY NOMOGRAPH
.r
p, : 53.36 y
EXAMPLE:
200 “d’s
,O, = 3.56.10”ohm,
__--
3.0x lO%mps
_---
I ohms
_*--
.ly---
_*-- ”
- 100 100
2-
i i
= 10’0 10’0
1
= 10”
z
0 1
- 10’2
2 -
; 10’3
;i
z _A--
2 10”
!s -
10’5
3 lo-’
e 10-a
___
y lo-”
= 10’6 10’6
2 10” 10”
VOLTAGE
RESISTIVITY RESISTIVITY
VOLUME RESISTIVITY NOMOGRAPH
- 10-12
CURRENT
-
10-12
-
10-l’
.--__
=
10-10 kc
-
10-q 2
5
z
i
5
s
l-i
THICKNESS
I
VOLTA1
GE
lo9
RESISTIVITY
= 10-e
2-3 10-T
CURRENT
SECTION 3.
THEORY OF OPERATION
VOLUME RESISTIVITY. The ASTM Standard* states
3-l.
that volume resistivity, o, shall be calculated as
follows:
where K is the volume resistance, in ohms, measured
For the Model 6105, which uses circular electrodes,
A is
where Do is the dimension indicated in Figure 3. For
the Model 6105, Do is equal to Z-118 inches or 5.40 cm.
as specified in the publication;
t is 'the average thickness of the sample:
A is the effective area of the guarded electrode
for the particular elecmode arrangement
employed.
IT2
A=$.
VOLUME
3-2. SURFACE KESISTI"ITY. The ASTM Standard* states
that surface resistivity, s, shall be calculated as
follows:
where R is the surface resistance, in ohms, measured
as specified in tl>e publication;
g is the distance between the electrodes;
P is the effective perimeter of the guarded
electrode for the particular electrode
arrangemenr employed.
For the Model 6105, which uses circular electrodes,
P, is
P = Do r
where Do is the dimensj~on indicated in Figure 3.
FIGUP.% 4. "OLum RESISTIVITY
*American Society for Testing and Materials, Standard
Methods of Test for Electrical Resistance of Insul-
acing Materials, ASTM Designation D257-66
4
FIGURE 5. SOWACE RESISTIVITY
SECTION 4.
MAINTENANCE
ReSiSti”ity Adapter 80164 wade1 6105
1 Test Weight, Stainless Steel 80164 16371A
2
3 Test Lead Assembly 80164 157063
4 Banana Pl.“g
5 FE fener , Thumb-screw 80164 SK-4
6
8 . Guard Ring Insulator 80164 15708A
9 Receptacle, bnc
10 Receptacle, uhf, Mil. x0. so-239
II ildifed Short circuit Plug 80164 23443A
. ‘Test Weight Assembly 801~64 15702A
. Handle Assembly 80164 16231A
108-303
Banana Jack (3 rcqd.)
chard Ring
Test Plate Assembly 80164 15709B
Test Plate 80X4 3~6369A
&ate of bnc receptacle)
im of uhf receptacle, Mil. NO. 49190
108-901
31-221
31-002
6804
5127 91737 c-49
74970 Lx-5
7497" W-6
80164 1637OPx
02660 cs-15
02660 cs-44
91737 cs-64
Test Instrumentation Group
Keithley Instruments, Inc.
20775
Cleveland, Ohio 44139
Aurora Road
Printed
in the tJ.S.A
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