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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, INDI-
RECT, 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
SECTION 1. GENERAL INFORMATION
l-l. GENERAL.
a. The Model 6105 Resistivity Adapter is a guarded SAMPLE SIZE: Maximum: 4-inch diameter (10.2-a
te*t fixture for measuring volume and surface resis- diameter)
tivities af materials when used with a regulated power Minimum: Z-l/Z-inch diameter (6.3-cm
supply and an eleccromecer. The complete sysc?m per- diameter)
mits measurement of volume resistivicy from 10 c0 SAMPLE THICKNESS: l/l6 inch co 114 inch (0.159 cn
3 x 1019 ohm-cm and surface resiscivicy from lo3 co to 0.635 cm).
5 x 1018 ohms, in accordance with procedures of cbe TEST VOLTAGE i&GE: 1 volt c" 1000 vales.
American Society far Testing and Materials. The MAXIMUM TEST VOLTAGE: 1000 "OlCS.
Adapter can accommadace samples up co 4 inches in ""LUME RESISTI"ITY RANGES: 1.5 x 102 to 1.5 x 1018
diameter and 114 inch chick with excitation voltages ohm-inches (lo3 co 101' ohm-cm).
up to 1000 volt*. SURFACE RESISTI"ITI RANGES: lo3 cr, 10IS ohms.
CmNECTORS: Power: Teflon insulated uhf-type
b. The Model 6105 has been designed c0 minimize receptacle.
measurement error. The electrode configurations con- Electrometer: BNC-type recepcac1e.
form co the ASTM recommendations for measurement of "IMENSlONS: 6 inches wide x 4-l/2 inches deep x
electrical resisrance of insulating materials. The 4 inches high.
test sample is shielded co prevent stray pickup. The NET WEIGHT: 3 pounds.
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 Volt-
age Supply and the Keichley Model 610C Multi-Range
Electrometer. The Model 240A provides excicacion
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. Its accuracy is fZ% of full scale f" 10-11
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. FIGURE 1. MODEL 6105
SECTION 2.
2-l. PREPAEATION FOR USE. The Model 6105 is shipped b. Surface Resisrivicy Measurements. Place the
with two thumb-screw fasteners holding the test weight short circuit slug over the lower two iacks, leavina
to the guard ring. Remove ehese fasteners and store "SURFACE" cle&ly-visible. Insert the-ban&a plug I
for later use. These are used only for shipping and from the fesf weight assembly into the top jack. Close
they should not be used during measurements. In the Model 6105 cover. Apply the power supply "olt-
mounting the sample for measurement, make sure there age. Read the current on the electrometer. The value
are no conductive paths between the electrodes other of the surface resistivity is found through the fol-
than those through the sample. The sample should be lowing calculation:
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. For best results, clean the sample sur- where 0 is the surface resistivity of the sample;
faces with an alcohol and ether mixture or'other suit- V is the applied voltage from the power supply
able solvent. in volts;
I is rhe cu+rent reading from the electrometer.
a. Volume Resisrivity Measurements. Place the
short circuit plug o"er the upper wo jacks, leaving
"VOLITME" clearly visible. Inserf the banana plug from 2-2. CONNECTIONS. Connect the power supply to the
the fest weight assembly into the bottom jack. Close uhf-type recepracle. Connect the electrometer to the
the Model 6105 cover. An interlock switch disconnecrs bnc-type receptacle. Place rhe sample under the test
the potential to the sample if the co"er is opened. weight as shown in Figure 5. The sample thickness
Apply the power supply voltage. Read the current on should be between l/l6 and 114 inch (0.159 and 0.635
the electrometer. The value of the volume resisrivity cm). The diameter should be beween 2-l/2 and 4 inches
p, is found through one of the following calculations: (6.29 and 10.2 cm).
3.53 v
p = x ohm-inches
I
_ 22.9 v
ohm-centimeters
% 1
where p is the volume resistivity of the sample;
V is the applied voltage from rhe parer supply 2-3. PROCEDURE. The Model 6105 Demits eas" measue-
in volts; menc Of a sample. The test sample is placedabeween
ti is the average thickness of the sample in the two electrodes; the desired test potential is
inches; selected from the voltage supply and the current pass-
tc is the average thickness of the sample in ing through the test sample is measured by the elec-
centimeters; trometer . From readings from the voltage supply and
I is the current reading from the elecrrmerer. the electrometer, the resistiviries can be computed.
I
1
118 in.
.31 cm. I
FIGURE 3. DIMENSIONING FOR MODEL 6105 ELECTRODES
2
SURFACE RESISTIVITY NOMOGRAPH 3 lo-'
- 100
1
2-
i
= 10'0 e 10-a
p, : 53.36 y ohms
I
= 10"
z
0 1
- 10'2
EXAMPLE:
200 "d's 3.0x lO%mps 2 -
,O, = 3.56.10"ohm,
;i ; 10'3 ___
z _A--
.ly---
_*-- _*-- "
2 10"
_---
__-- !s -
.r
10'5 y lo-"
= 10'6
- 10-12
2 10"
VOLTAGE RESISTIVITY CURRENT
- 10-12
VOLUME RESISTIVITY NOMOGRAPH
- 10-l'
.--__
= 10-10 kc
5
z
i
5
- 10-q 2
s
l-i
= 10-e
lo9
I RESISTIVITY 2-3 10-T
THICKNESS VOLTA1GE CURRENT
SECTION 3. THEORY OF OPERATION
3-l. VOLUME RESISTIVITY. The ASTM Standard* states 3-2. SURFACE KESISTI"ITY. The ASTM Standard* states
that volume resistivity, o, shall be calculated as that surface resistivity, s, shall be calculated as
follows: follows:
where K is the volume resistance, in ohms, measured where R is the surface resistance, in ohms, measured
as specified in the publication; as specified in tl>e publication;
t is 'the average thickness of the sample: g is the distance between the electrodes;
A is the effective area of the guarded electrode P is the effective perimeter of the guarded
for the particular elecmode arrangement electrode for the particular electrode
employed. arrangemenr employed.
For the Model 6105, which uses circular electrodes,
A is For the Model 6105, which uses circular electrodes,
IT2 P, is
A=$.
P = Do r
where Do is the dimension indicated in Figure 3. For
the Model 6105, Do is equal to Z-118 inches or 5.40 cm. where Do is the dimensj~on indicated in Figure 3.
VOLUME
FIGUP.% 4. "OLum RESISTIVITY FIGURE 5. SOWACE RESISTIVITY
*American Society for Testing and Materials, Standard
Methods of Test for Electrical Resistance of Insul-
acing Materials, ASTM Designation D257-66
4
SECTION 4. MAINTENANCE
ReSiSti"ity Adapter 80164 wade1 6105
. `Test Weight Assembly 801~64 15702A
1 Test Weight, Stainless Steel 80164 16371A
2 . Handle Assembly 80164 16231A
3 Test Lead Assembly 80164 157063
4 Banana Pl."g 108-303 74970 Lx-5
5 FE fener , Thumb-screw 80164 SK-4
6 Banana Jack (3 rcqd.) 108-901 7497" W-6
chard Ring 80164 1637OPx
8 . Guard Ring Insulator 80164 15708A
Test Plate Assembly 80164 15709B
Test Plate 80X4 3~6369A
9 Receptacle, bnc 31-221 02660 cs-15
&ate of bnc receptacle) 31-002 02660 cs-44
10 Receptacle, uhf, Mil. x0. so-239 6804 91737 cs-64
im of uhf receptacle, Mil. NO. 49190 5127 91737 c-49
II ildifed Short circuit Plug 80164 23443A
Test Instrumentation Group
Keithley Instruments, Inc.
20775 Aurora Road
Cleveland, Ohio 44139
Printed in the tJ.S.A