Keithley 1801, Инструкция по эксплуатации, Страница: 21 / 93

Installation
2-7
• Use only shielded low-thermal cables such as the
input cable supplied with the Model 1801.
• Use only crimped-on copper lugs and copper wires
for all input connections. Crimping results in an air-
tight connection.
• Copper-to-copper oxide connections result in
thermoelectric potentials as high as 1000µV/°C (see
paragraph 3.4.1). To avoid these thermals, make sure
that all connections are clean and free of oxides.
Scotchbrite® copper cleaner can be used to clean
connections.
• Do not handle the prepared ends of the input cable.
Body oils and salts can result in contamination,
affecting connection integrity.
CAUTION
To avoid possible preamplifier dam-
age, keep static electricity discharge
away from input terminals.
The supplied input cable can be used for most measure-
ment functions, but some such as thermocouple measure-
ments may require different connecting wires. For input
connection information specific to the type of measure-
ment function, refer to paragraph 3.3 in Section 3.
CAUTION
Turn off the Model 2001 Multimeter
power before connecting or discon-
necting the cable.
2.5.2 Output connections to multimeter
After installation, connect the output leads to the Model
2001 rear panel input jacks, as shown in Figure 2-7. For
DCV, ACV, frequency, and temperature measurements,
the red lead should be connected to INPUT HI, and the
black lead should be connected to INPUT LO.
NOTE
Be sure to select the rear inputs with the
front panel INPUTS switch when using
the Model 1801. Output connections for
4-wire resistance measurements must be
changed, as explained in paragraph 3.3.2
in Section 3.
2.5.3 Input signal connections
Input connections are made directly to the two preampli-
fier screw terminals, as shown in Figure 2-8. When mak-
ing input connections, observe the following precautions
in order to minimize noise pickup and thermal EMFs:
Insert Plug in
Connector
Preamplifier
Module
Power Supply
Cable
Power Supply
Card
Figure 2-6
Power supply connections