Keithley 708A, Инструкция по эксплуатации

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IEEE-488 Programming
5-4
NOTE
To minimize interference caused by elec-
tromagnetic radiation, use only shielded
IEEE-488 cables. The Model 7007-1 and
7007-2 shielded IEEE-488 cables are
available from Keithley Instruments.
Connect the cable to the Model 708A as follows:
1. Line up the connector on the cable with the connector on
the rear panel of the instrument. Figure 5-4 shows the
IEEE-488 connector location.
2. Tighten screws securely, but do not overtighten them.
(Overtightening can break the connector.)
3. Add additional connectors from other instruments, as
required.
4. Make sure the other end of the cable is properly connect-
ed to the controller. Some controllers have an IEEE-488
type connector, while others do not. Consult the instruc-
tion manual of your controller for the proper connecting
method.
NOTE
The IEEE-488 bus is limited to a maxi-
mum of 15 devices, including the control-
ler. Also, the maximum cable length is
limited to 20 meters, or 2 meters multi-
plied by the number of devices, whichever
is less. Failure to observe these limits may
result in erratic bus operation.
In master/slave configurations, only the
master unit is connected to the IEEE-488
bus. If slave units are also connected,
erratic bus operation results. Custom
cables may be constructed by using the
contact assignments listed in Table 5-2 and
shown in Figure 5-5.
IEEE-488 INTERFACE
IEEE-488
ADDRESS
1
2
3
4 5 6
7
8
1
2
3
4 5 6
7
8
LINE RATING
90-250V
50-60 HZ
110 VA MAX
WARNING:
NO INTERNAL OPERATOR SERVICEABLE PARTS.
SERVICE BY QUALIFIED SERVICE PERSONNEL ONLY
INSTRUMENT INTERNALLY FUSED. !
2 2
3 3
4 4
5 5
6 6
8 8
9 9
0 0
1 1
7 7
Figure 5-4
IEEE-488 connector location
Table 5-2
Contact assignments
Number
Contact
designation
IEEE-488 type
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
DIO1
DIO2
DIO3
DIO4
EOI (24)*
DAV
NRFD
NDAC
IFC
SRQ
ATN
SHIELD
DIO5
DIO6
DIO7
DIO8
REN (24)*
Gnd, (6)*
Gnd, (7)*
Gnd, (8)*
Gnd, (9)*
Gnd, (10)*
Gnd, (11)*
Gnd, LOGIC Data
Data
Data
Data
Management
Handshake
Handshake
Handshake
Management
Management
Management
Ground
Data
Data
Data
Data
Management
Ground
Ground
Ground
Ground
Ground
Ground
Ground
*Number in parentheses refers to the signal ground
return of reference contact number. EOI and REN sig-
nal lines return on contact 24.
CONTA CT 12 CONTA CT 1
CONTA CT 13 CONTA CT 24
Figure 5-5
Contact assignments
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