Model 6487 Reference Manual Measurements and Sourcing Voltage 3-7
The following command sequence uses the acquire method to zero correct the 200µA
range:
*RST ' Set instrument to known default
' conditions in one-shot trigger mode.
SYST:ZCH ON ' Enable zero check.
CURR:RANG 2E-4 ' Set instrument to 200uA range.
INIT ' Trigger one reading.
SYST:ZCOR:STAT OFF ' Turn zero correct off.
SYST:ZCOR:ACQ ' Acquire zero correct value.
SYST:ZCH OFF ' Disable zero check.
SYST:ZCOR ON ' Perform zero correction.
The INITiate command in the above sequence is used to trigger a reading. This reading is
the offset that is acquired as the zero correct value. See Section 7 for more information on
INITiate.
klqb Sending the :ACQuire command while zero check is disabled will result in an
error. The command will not be executed.
Current measurements
Procedure
t^okfkd The maximum safe voltage between picoammeter LO and chassis
ground (common mode voltage) is 505V. The Model 6487 does not
internally limit the LO to chassis voltage. Exceeding 505V can create a
shock hazard.
If it is possible for the DUT or external supply to present more than
505V to the input HI, it is imperative that the connection between
input LO and the external voltage source be sufficiently low impedance
and capable of carrying the short-circuit current of the source, in order
that the LO not exceed 505V.
`^rqflk The LO to chassis breakdown voltage is 505V. Exceeding this voltage
may cause damage to the instrument.
The maximum input voltage and current to Model 6487 is 505V peak
and 21mA. Exceeding either of these values may cause damage to the
instrument that is not covered by the warranty.
To achieve optimum precision for low-level current measurements, input bias current and
voltage burden can be minimized by performing the offset correction procedure. Informa-
tion about these offsets are provided in “Measurement considerations” on page -2.
To Next Page
Loading...
Need help?
General
