Keithley 7013-C, Instruction Manual

Page: 45 / 71

Service Information
5-2
5.3 Performance verification
The following paragraphs discuss performance verifi-
cation procedures for the Model 7013, including chan-
nel resistance, offset current, contact potential, and
isolation.
CAUTION
Contamination will degrade the per-
formance of the switch card. To avoid
contamination, always grasp the card
by the side edges and shields. Do not
touch the connectors, and do not
touch the board surfaces or compo-
nents. On plugs and receptacles, do
not touch areas adjacent to the elec-
trical contacts.
NOTE
Failure of any performance verifica-
tion test may indicate that the switch
card is contaminated. See paragraph
5.2 to clean the card.
5.3.1 Environmental conditions
All verification measurements should be made at an
ambient temperature between 18° and 28°C, and at a
relative humidity of less than 70%.
5.3.2 Recommended equipment
Table 5-1 summarizes the equipment necessary for per-
formance verification, along with an application for
each unit.
Table 5-1
Verification equipment
Description Model or part Specifications Applications
DMM Keithley Model 196 300
Ω
; 0.01% Path resistance
Electrometer w/voltage source Keithley Model 617 10pA, 100pA; 1.6%
100V source; 0.2% Offset current, path isola-
tion
Sensitive Digital Voltmeter Keithley Model 182 3mV; 60ppm Contact potential
Triax cable (unterminated) Keithley Model 7025

Offset current
Low thermal cable
(unterminated) Keithley Model 1484

Contact potential