Keithley 6521, Инструкция по эксплуатации, Страница: 29 / 65

3
Operation
3-1
3.1 Introduction
This section contains detailed information on front panel and
IEEE-488 bus operation of the Model 6521/22. The informa-
tion in this section is organized as follows:
3.2 Signal limitations:
Summarizes the maximum signals
that can be applied to the Model 6521/22.
3.3 Scanner card detection:
Discusses how the scanner
card is detected and how to determine whether or not
the card is installed with a bus command.
3.4 Front panel operation:
Gives an overview of the Mod-
el 6517 Electrometer front panel scanner controls and
discusses how to open and close channels and perform
basic scanning.
3.5 IEEE-488 bus operation:
Summarizes bus commands
necessary to control the scanner card and gives an over-
view of general bus scanner operation.
3.6 Measurement considerations:
Discusses a number of
measurement considerations that should be taken into
account when using the scanner card with the Model
6517.
3.7 Typical applications:
Discusses typical applications
for the Model 6521/22.
NOTE
Before using the Model 6521/22 scanner
card, you should be thoroughly familiar
with the operation of the Model 6517
Electrometer. See the Model 6517 User’s
Manual for details.
3.2 Signal limitations
CAUTION
To prevent damage to the Model 6521/
22, do not exceed the maximum signal
level specifications of the card.
3.2.1 Model 6521 signal limitations
To prevent over-heating or damage to the relays, never ex-
ceed the following maximum signal levels when using the
Model 6521:
• Maximum signal level (HI to LO): 30V, 500mA, 10VA
(resistive load)
• Maximum common-mode voltage (LO to chassis
ground): <30V peak
WARNING
Applying >30V peak common-mode
voltage will result in a shock hazard.
3.2.2 Model 6522 signal limitations
To prevent over-heating or damage to the relays, never ex-
ceed the following maximum signal levels when using the
Model 6522:
• Maximum signal level (HI to LO): 200V, 500mA, 10VA
(resistive load)
• Maximum common-mode voltage (LO to chassis
ground): <250V peak