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Model 515A
Megohm Bridge
Instruction Manual
Contains Operating and Servicing Information
WARRANTY
We warrant each of our products to be free from defects in materi-
al and workmanship. Our obligation under this warranty is to repair
or replace any instrument or part thereof which, within a year after
shipment, proves defective upon examination. We will pay domes-
tic surface freight costs.
To exercise this warranty, call your local field representative or the
Cleveland factory, 440-248-0400. You will be given assistance and
shipping instructions.
REPAIRS AND RECALIBRATION
Keithley Instruments maintains a complete repair service and stan-
dards laboratory in Cleveland, and has an authorized field repair
facility in Los Angeles and in all countries outside the United States
having Keithley field representatives.
To insure prompt repair or recalibration service, please contact your
local field representatives.
To insure prompt repair or recalibration service, please contact your
local field representative or the plant directly before returning the
instrument.
Estimates for repairs, normal recalibrations, and calibrations trace-
able to the National Bureau of Standards are available upon request.
Model 515A Megohm Instruction Manual
0Keithley Instruments, Inc
All rights reserved.
Cleveland, Ohio, U.S.A.
MODEL 515A MEGOHMBRIDGE CONTENTS
CONTENTS
Section Page
ii
1. 1
2. 4
3. 15
4. 17
5. 20
29
31
1072R
SPECIFICATIONS MODEL 515A MEGOHMBRIDGE
SPECIFICATIONS
RANGE: 105 to d5 ohms with a 7-dial in-line readout.
ACCURACY: (when bridge is operated es described below):
Range, ObnlS Standard Deviation (lr)r* Bridge Voltage Decade
105 co lo7 .012% 10 " 105 to 106
107 to 108 .02% 10 " 107
100 to 109 .03% 10 " 10;
109 .06% 10 "
1o1o ;: :$ lOlO
.08% 10 "
$1
1011 eo 1012 .16% 10 "
1012 to 1013 .25% 100 Y
1013 to 1014 .3% 500 "* $f
1014 to 1015 1.5% 500 v*
INPUT: Built-in comparfmenf or optional Remote Test Chamber with Teflon-insulated tri-
axial cable.
GROUNDING: One terminal of unknown is at ground potential.
NULL DETECTOR: Electrometer with sen*itivity of 100 microvoles per division to 1 volt
per division in five decade steps. Meter is non-linear past l/3 of full scale for
ease in determining null.
BRIDGE POTENTIAL: Internal: Prom 0 to + 110 volts dc in l-volt steps. External
With Keithley Model 240A or 241 High Voltage Supply, 1000 volts maximum, positive
only.
INTERNAL CHECKS: Built-in zero check anu leatige (guard fo ground) check. Test jacks
for checking wirewound standard resistors. Bootstrap calibration from wirewound
standards for the 10' through 1012 decades.
ENVIRONMENT: Any i O.S