Keithley 486 Instruction Manual page 121

SECTION 4
IEEE-488 Reference
U6 Relative Value (Current)
BysendingtheUbco mmand and addressing the instrument to talk, the stored relative baseline
value (2) for current measurementz can be obtained. For example, if the relative value for cur-
rent is ImA, the following ASCII string will be obtained using the U6 commandz
RV=+1.OOooOE-O3A
U7 Relative Value W/l Ohms)
By sending the U7 command and addressing the instrument to talk, the stored relative baseline
value (Z)forV/Iobmsmeasurementscanbeobtained. Forexample,iftherelativevalueforV/I
ohms is 1000, the following ASCIl string will be obtained using the U7 command:
Note: Sending U7 to a Model 486 causes an IDIXO error.
U8 Voltage Source Value
By sending the U8 command and addressing the instrument to talk, the programmed voltage
source value for the Model 487 can be obtained. For example, if the voltage source of the Model
487 is programmed for +ZOV, one of the following ASCII sirings (depending on range) will be
obtained using the U8 command:
VS=+2O.OOOE+OOV W-Source on 50V range)
or
VS=+O2O.COE+OOV W-Source on 5ooV range)
Note: Sending the U8 command to the Model 486 will result in an IDDCO error.
UV Voltage Source Error Status
By sending the U9 command and addressing the instrument to talk, the error status of the.volt-
age source of the Model 487 can be obtained. The error status word is shown in Figure 48.
487 on on
L
I- t = Interlock Open
1 = Current Limited
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