8588A/8558A
Operators Manual
84
(Zero Range): initiates a series of measurements to zero the input and
save the result in volatile memory. Zero range only acts on the actual range the
Product is in, even if Auto range is selected. An indication of the application of an
input Zero is shown on the display, showing Zero On. Independent zero
corrections are provided for front and rear terminals and, when in ohms
functions, all of the modes and LoI On and Off operation. For ac always use the
lowest possible range. After the input Zero in ac, all subsequent readings will be
RSS’ed corrected by this zero so the reading may not absolutely show "zero".
(Zero Function): initiates a series of measurements on each range in the
function starting with the highest range, to determine and correct for the residual
offset in each range.
(Clear Range): Clears the Zero for the range the Product is currently on.
The Zero indicator is removed from the display.
(Clear Function): Clears the Zero for the function the Product is currently
on. The Zero indicator is removed from the display.
(Abort Zero): Aborts the Zero operation that is in progress. If a range or
function has a prior Zero value, that value is retained.
Use the Zero Operation
When performing the Zero operation, use the lead configuration for that particular
function, as it is typically thermal emfs from the lead connections that need to be
corrected. For DCV, ACV, and ohms, short the leads that are being used from HI
to LO. For DCI, ACI, and Capacitance, the leads HI to LO should be open. After
making the proper lead connections, observe the Product reading and wait for
the readings to become stable before you perform the Zero operation. The Zero
operation can also be used to have the Product read zero in DCV, ohms, or DCI
without the influence of external leads. To do so in DCV and ohms, short the
Product inputs with the shorting pcb accessory, and Zero functions or ranges as
appropriate. For DCI, leave the Product inputs open.
Ohms: An independent Zero can be executed for the modes (2W Normal, 4W
Normal, 4W Tru, 2W HV and 4W HV) as well as for LoI On or Off.
ACV and ACI: A Zero operation may not read exactly zero with the input leads
shorted as the displayed readings are root-sum-squared (RSS) with any noise
present.
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