V-Voltagesource - Keithley 486 Instruction Manual

SECTION 4
IEEE-488 Reference
4.2.20 v
- Voltage Source
Purpose Use to program the voltage source value, range and current limit of the Model 487.
Format
Vn,r,l
Parameters n -Specifies the voltage source level; -505V to +505V
r - Selects the voltage source range;
0 = 5ov range
1 = 500V range
1 - Specifies the current limit;
0=25pAlimit
1 = 2.5mA limit
Default
Upon power-up or after a DCL or SDC command is received over the bus, the voltage source
returns to the last saved default condition.
Description
The V command is used to program the voltage source of the Model 487. The voltage source
level can be sent in normal decimal form (i.e. 236) or in exponential form (i.e. 2.36E+23.
All three parameters need not be sent with the V command. However, the commas that nor-
mally precede a parameter you are going to send must be included in the command string. The
following examples are valid command string%
Valid Co mmand Strings:
VlX Sets source to 1V (range and limit not changed)
V,lX Selects 5COV range (level and limit not changed)
V,,OX Selects 25pA current limit (level and range not changed)
V2,JX Sets source to 2V and current limit to 25mA (range nokhanged)
Programming
Notes
1. Semilng a level value that exceeds k505V will result in an IDDCO errof. The entire com-
mand string will be ignored.
2. Sending a level value that exceeds the capability of the selected voltage source range will
result in a CONFLICT error. The entire command string will be ignored.
3. Sending the V command to the Model 486 will result in an IDDC error.
4. The programmed voltage source will not be applied to the output until the instrument is
placed in operate (0 command).
Programming
Example
OUTPUT 722; 'vlo,o,lY ! Program for IOV on the 50V range with a current limit of
2.5m.k.
4-38