3. Calibration Procedure
The 2701C offers 100% covers-on calibration that may be performed manually or via the
IEEE interface bus, if installed. See Section 5 for the remote calibration procedure.
The 2701C provides 10 voltage calibration points that are always calibrated in the same
sequence using the same adjustment procedure. Two additional points are provided if the
120mA option is installed. The 1200V range points are skipped in instruments equipped
with Option LNF. The following section describes calibration using manual adjustments.
4. Manual Calibration
The following procedure should be used to perform a routine calibration on the 2701C.
Readings should be allowed to settle for a minimum of 30 seconds before making any
adjustment.
1)
Make connections from the 2701C SENSE terminals to the voltmeter using the low-
thermal lead set.
2)
The calibration is initiated by turning the key-switch on the 2701C rear panel to the
CALIBRATE position. Cal mode is confirmed by a "
C
" in the far right digit of the
display.
3)
200mV Range, .000000C displays.
Adjustments to the output are made using the
rightmost three knobs on the 2701C front panel. The knob on the far right provides
the least amount of change. The second from the right provides a medium amount of
change while the third from the right provides the greatest amount of change.
Clockwise rotation of the knobs will increase the output while counter-clockwise
rotation decreases the output.
Adjust the necessary combination of knobs to bring the output level to 0
±
1
µ
V. The
2701C display will not change as the knobs are adjusted. The adjustment is entered
into memory by pressing the STANDBY/OPERATE Mode key once. The 2701C
will proceed to the next step.
NOTE:
If a particular range requires no adjustment, it may be skipped without changing its
value by pressing the STANDBY/OPERATE switch before any adjustment of the knobs is
made.
NOTE:
If a particular range is too far out of adjustment for the microprocessor to
compensate for it, the words "
FAIL CAL
" may flash on the display. In this case, a problem
with the instrument or the test setup is indicated.
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