Keithley 6487 Reference Manual page 272

Model 6487 Reference Manual
Table C-1 (cont.)
Device dependent command summary
Mode Command
Z0
Z1
Relative
Z2,V
(REL)
Z3
Equivalent SCPI or 488.2 commands
Disable relative
CALCulate[1]:NULL:STATe OFF
Enable relative using present reading as baseline
CALCulate[1]:NULL:ACQuire
CALCulate[1]:NULL:STATe ON
Enable relative using V as baseline: V = -2e-2 to 2e-2A for
current. V = 0Ω to 50.5e16Ω for V/I ohms.
CALCulate2:NULL:OFFSet <NRf>
CALCulate2:NULL:STATe ON
Enable relative using previously defined baseline
CALCulate[1]:NULL:STATe ON
A) Only characters will be dimmed. Annunciators will not be dimmed.
B) Zero Correct and Zero Correct notes:
a. Sending C2X will perform a Zero Correct operation. If the unit is not
already in Zero Check, then Zero Check will be turned on first, then the
Zero Correct value collected, then Zero Check will be turned off.
b. The 487 offers no way to "turn off" Zero Correct. Once a C2 command
has been sent, Zero Correct (and the corresponding MON annunciator)
will remain on. To turn off the Zero Correct and MON annunciator, use
the front panel to turn off Zero Correct.
c. Like the 487, subsequent C2 commands will cause a new Zero Correct
value to be acquired.
d. The 6487 saves only a single Zero Correct value, not one for each range
as with the 487. For best results, send a C2 command to acquire new Zero
Correct value after going to the desired range. Also, unlike the 487, Zero
Correct values are not saved across power cycles and must be re-acquired
after power cycling the unit.
C) G6 and G7 are not supported by the Model 6487 since they are seldom used.
D) The Model 487 uses different keys and menu structure than the Model 6487, so
key mapping is not comparable.
E) The J commands (J0, J1) for RAM and ROM self-tests will be accepted but take no
action. RAM and ROM are tested at power-up. The display may be tested from the
front panel.
Description
DDC Emulation Commands
Note
C-9
Default
X