Keithley 6512, Instruction Manual

Page: 26 / 156

Operation
2-6
2.5.1 IEEE-488 address
Selection of the IEEE-488 address program is indicated by
the following message:
IEEE 27
Along with the message, the presently programmed IEEE-
488 address (the factory default value of 27 in this example)
will be displayed. To select a new address, use the ADJUST
keys. When the desired value is shown in the display, press
SHIFT then SELECT EXIT to return to normal operation (or
if a change was made, simply press SELECT). For complete
information on using the Model 6512 over the IEEE-488 bus,
refer to Section 3.
2.5.2 Exponent mode (alpha or numeric)
The display exponent of the Model 6512 can be operated in
either the alpha mode or the numeric mode. In the alpha
mode, the exponent is given in actual units such as mA. In
the numeric mode, the exponent is given in scientific nota-
tion. Table 2-4 gives typical examples, including units.
To select the exponent program, scroll through the program
menu until the following message is displayed:
dISP
Use either of the ADJUST buttons to set the exponent to the
desired mode. In the numeric mode, the display might show:
dISP -3
The display in the alpha mode appears as:
dISPm
Once the desired exponent mode is selected, press SHIFT
then SELECT EXIT to return to normal operation (or simply
PROGRAM SELECT if a change was made).
2.5.3 Calibration
An advanced feature of the Model 6512 is its digital calibra-
tion program. The instrument can be calibrated from the
front panel or over the IEEE-488 bus. To use the front panel
calibration program, refer to the calibration procedures out-
lined in Section 7, paragraph 7.4.9.
2.6 Rear panel familiarization
The rear panel of the Model 6512 is shown in Figure 2-2.
Table 2-4
Typical display exponent values
Display
Engineering
units Scientific
notation
Value
PA pA 10
-12
A Picoamperes
nC nC 10
-9
C Nanocoulombs
µA µA 10
-6
A Microamperes
mV mV 10
-3
V Millivolts
k
Ω
k
Ω
10
3
Ω
Kilo-ohms
M
Ω
M
Ω
10
6
Ω
Mega-ohms
G
Ω
G
Ω
10
9
Ω
Giga-ohms