Calibration and Verification
Calibration Menus
3
3-7
±10 % of the stored frequency is accuracy enhanced by reducing frequency response
flatness errors.
Calibrate the spot at a new frequency:
To calibrate the spot at a new frequency, change the input signal to the desired new
frequency and press
SAMPLE
as before.
Quit
Reverts to the
SPOT CAL
menu with the original Spot calibration intact.
Special Calibration
The
SPCL
menu provides alignment of the main ADC and calibration of the frequency
counter.
It also allows the High Voltage Linearity Pre-Calibration to be performed and a section of
the Non-Volatile memory to be cleared for test purposes. These facilities are used in the
factory for initial pre-calibration processes; they should not require access during the life
of the Multimeter unless repairs have been carried out. They appear here for
completeness.
SPCL Menu
The
SPCL
menu appears after pressing the
Spcl
key in the
CALIBRATION
menu. At
the same time the Multimeter is placed in special calibration mode, and the Special
CAL
legend appears on the main display.
When in Special
CAL
mode the following front panel keys remain inoperative:
CLEAR
,
TEST
,
OFFSET
,
PRT
and
INPUT
. Also, the function of the
SAMPLE
key changes to
become the trigger key for initiating the Hvlin calibration operation.
adj137f.eps
SPCL Menu
The
SPCL
menu provides the selection:
Ser#
Permits entry of the Multimeter’s serial number.
Adc
Aligns the different resolutions available from the Multimeter's main analog-
to-digital converter, so that there are no significant differences in readings
when changing resolutions with a constant input value. No external input
signals are required for this calibration. Calibration is initiated directly by
making this selection from the SPCL menu.
Freq
Calibrates the frequency counter against an external source. Calibration is
initiated directly by making this selection from the SPCL menu.
Hvlin
Selects the sequence required to correct the linearity of the 1kV DC range.
ClrNv
Provides the capability to clear a section of the non-volatile memory for ‘test
purposes only’.
Quit
Reverts to the
CALIBRATION
menu.
SER # = Menu
This menu is obtained by pressing
Ser#
in the
SPCL
menu. On entry to the menu, the
most-recently-entered serial number is shown, and the keyboard is activated. A numeric
value can be entered.
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