Maintenance; General; Recommendedtestequipment; Recommended Test Equipment - Keithley 181 Service Manual

I
MODEL 181
MAINTENANCE
Section 5. Maintenance
5-l. GENERAL
This section contains information necessary to maintain the
Model 181. Adjustment/Calibration, troubleshooting and fuse
replacement procedures are provided. Calibration should be
performed yearly (every 12 months) or whenever 24 hour
specifications are desired or whenever performance verifi~
cation isee Section 3) indicates that lhe Model 181 is out of
specifications. If any step in the calibration procedure cannot
be performed properly, refer to the troubleshooting inform
mation in this section or contact your Keithley representative.
or the factory.
TABLE 5-2
VOLTAGE DIVIDER PARTS LIST
Keithley
Part Number Description
BP-l,-0 I Black Blndlnq PO51
BP~ll-1
Model 1485
N/A
N/A
NOTE
Model 1483
Because of special handling, expertise, and
equipment that is required. it is strongly recom
mended that the 181 be sent back to the factory
for service andlor calibration.
Red B,nd,ng Post
LowThermal Female Input
Connecter
lIXlk0. 01%. 10ppmi"C. Wirewounil
Low Thermal Construction
lC0R. .Ol%, 10ppml°C. W~rewourrd
Low Thermal Construction
Low Thermal Construction KI,
WARNING
All service information is intended for quali-
fied electronic maintenance
persOnnel
only.
5-2. Recommended Test Equipment
Recommended test equipment for calibration is listed in Table
5-l. Alternate test equipment may be used. However, the
accuracy of the alternate test equipment must be at least three
times better than the Model 181 specifications, or equal to
Table 5-l specifications.
5-3. Voltage Divider
The Voltage Divider IBI recommended is not readily available
on the commercial market. The following information IS prop
vided in order that this divider may be constructed.
C. 2WA-29 Washer
D, 1 19166 Strain relief
TABLE 5-l
RECOMMENDED TEST EQUIPMENT
Item
A
Description
DC Calibrator
Voltage Divider
Oscilloscope
DMM
Maintenance Kit
Kelvin Varley Divider
Law Thermal input
Cable
Low Noise
Preamplifier
Specifications
1.9v. ISV, 19ov. loco/
+ .ool% ,10ppmi
+ .Ol% IlOppml
2mClcm
.003% + Id
Mfr. Model
Fluke 332D
7603
5903
1815
720A
1481