VTI Instruments Ametek EX1200A Series, User Manual

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VTI Instruments Corp.
128 EX1200A Web Page Operation

Function sliders: The sliders provided in the Calibration Functions field allow to user to
perform a full calibration/verification or to perform calibration/verification on a subset of the
DMM’s functions.
o
All : Calibration/verification of all functions will be performed when selected. Also
causes all sliders to move to the ON position.
o
Low Frequency AC : Calculates the adjustment factors that are used in low frequency ac
measurements. Note, there is no verification component for this function.
o
DC Voltage : Calculates gains and offsets for dc voltage measurements.
o
DC Current : Calculates gains and offsets for dc current measurements.
o
AC Voltage DAC : Calculates an adjustment factor for the DAC used in the ac voltage
measurement circuit. Note, there is no verification component for this function.
o
AC Voltage : Calculates gains and offsets for ac voltage measurements.
o
AC Current : Calculates gains and offsets for ac current measurements.
o
Resistance : Calculates gains and offsets for 2-wire and 4-wire resistance measurements.
Reference Instruments Field
The calibration and verification routines use VXI-11 to communicate with reference instruments.
As such, a hostname and device identifier (typically a GPIB address for a LAN-GPIP gateway)
must be specified for each instrument. Note that, while any LAN/GPIB gateway should work, only
the Agilent E5810A has been tested.

Calibrator : Specifies the calibrator that will be used for calibration. Currently only supports
F5700 and F5700A . An F5720 amplifier must be connected to the calibrator.

External DMM : Specifies the DMM which will be used for calibration. Currently only
supports HP3458A .

Function Generator : Specifies the function generator that will be used. Currently only the
HP33120A and HP33220A are supported.

Connect button: Once the fields have been populated, the user can attempt to connect to these
instruments by using the Connect button. If an instrument is found, it will be identified and
its identification displayed to the right. If identification or calibration information is missing
from any of the devices, the user will be prompted to enter it before continuing.
Note that only the instruments necessary for the selected calibration function(s) will be enabled in
this field. The following table indicates which procedures require each instrument.
Calibration/Verification Routine Required Instrument(s)
All Calibrator, External DMM, Function Generator
Low Frequency AC External DMM, Function Generator
DCV Calibrator, External DMM
All other routines Calibrator
Calibration Data Field
The Calibration Data field defines the type of calibration which will be performed as well as the
functions which will be calibrated.

Dataset : Indicates the identification number of the current dataset. The DMM can store nine
sets of adjustment data in its flash memory; dataset 0 is the factory calibration and is loaded
when the instrument is reset and at power-on.
o
Load Data : Loads the selected adjustment dataset from flash and into memory. Any
further measurements will be adjusted by the loaded dataset.
o
Save Data : Saves the current adjustment data into the selected dataset.
o
Dump Current Data : Saves the currently loaded adjustment data in a .csv format, by
default. The user will be prompted to provide a storage location.
o
Auto-Save : When selected, the data obtained while running a calibration procedure will
be automatically saved to the selected dataset upon completion, provided all calculated
adjustments are within tolerances.