Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley 502 502B(Model502)
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INSTRUCTION MANUAL
MODEL 502
MILLIOHMHETER
Kelthley Instruments. Inc.
29776 Aurora Road/Cleveland, Ohio 44139/(216) 249-0400
INSTRUCTION MANUAL
MODEL 502
MILLIOHMMETER
OCOPYRIGRT 1975, ~ITRLEY INSTRUMENTS, INC.
PRINTED JULY 1977, CLEVELAND, OHIO, U. S. A.
CONTENTS
SECTION
.,,...*.........,.................................
IN'IRODUCTION I
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...*.. II
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. III
A. Connections
(1) Low resistances
(2) Higher resistances
B. Procedure
C. Battery Test
D. Precaution5
CIRCUIT DESCRIPTION..,............,.,.....,................... IV
,...........................,......................
MAINTENANCE v
A. Batteries
B. Trouble Shooting
C. Schematic, DR 12189 C
D. Tube Voltage Diagram, DR 12256 C
E. Replacement Parts List
0762
MODEL
502 MILLIOHMMlKTHH INl'FiODUCTION
SECTION I - INTRODUCTION
The Keithley Model 502 is a battery operated, portable milliohmmeter
for measuring resistances from 0.00003 to 1000 ohms. The instrument
employs an AC testing method, eliminating zero drift and permitting
resistance readings in the presence of DC currents. The reading is
presented on a linear scale panel meter.
Typical applications of the instrument include measurement of con-
tact resistance, conductivity of semi-conductor samples, fuse and
squib testing, and electrolyte conductivity.
Maximum power dissipation in the sample is 2 microwatts, permitting
the measurement of detonator fuses without danger of detonation.
In the measurement of contact resistance, the model 502 may be
considered a "dry circuit" tester. However, the instrument may be
used in the presence of DC biasing currents to measure the change
in resistance caused by these currents.
FIGCFZ 1. Keithley Model 502 MilJiohmmeter with
carrying case open.
l-1
MODEL 502 MILLIOHMMETER SPECIFICATIONS
Ye
::::
SECTION II - SPECIFICATIONS
RANGES: The test current, the input vpltage drop, and the power dissipation
(Pd = 2&E,,) for full-scale readings on each range are given below:
tinge, Average Average Maximum
Ohms Applied Current, Voltage Drop, Dissipation
Milliamperes Microvolts in Sample,
Microwatts
0.001 10 10 0.2
0.003 10 30 0.6
0.01 10.00 100 2.00
0.03 3.33 100 0.66
0.1 1.00 100 0.2
0.3 0.33 100 0.066
1 0.1 100 0.02
3 0.2 600 0.24
10 0.06 600 0.072
30 0.02 600 0.024
100 0.006 600 0.0072
300 0.002 600 0.0024
1000 0.0006 600 0.00072
ACCURACY: 3% of full scale on all ranges except the O.OOl-ohm range, where
it is 5% of full scale. Less than 2% error is added in measuring samples with
a series reactance of 4% of sample resistance.
OUTPUT: Meter only.
SAFETY AND RELIABILITY: Maximum power dissipation in the sample with improper
range setting is three milliwatts. Maximum dissipation caused by instrument
component failure and improper range setting is six milliwatts.
INPUT ZERO: Lever switch prevents off-scale meter indications while changing
samples.
SPEED OF RESPONSE: Five seconds to 90% of final reading on all ranges.
ZERO DRIFT: None.
REPEATABILITY: Within D
2/,.
WARMUP
TIME: Within 30 seconds.
0963R 2-1
SPECIFICATIONS MODEL 502 MILLIOHMMETER
:.
::
BATTERY LIFE: 360 hours minimum. :
BATTERY TEST: An internal resistance standard is measured in the Battery
Test Position to provide a comple
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