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5790A
Service Manual
Some steps in the remainder of this procedure require
application of lethal voltages. Use extreme caution to avoid
contact with live conductors. Set the calibrator to standby and
verify that voltage has returned to zero immediately after each
high voltage calibration step is finished.
For the 200 mV points and below, remove the external sense leads and set
the 5700A to INT SENSE.
Step Name
Basic DC
Sensor turnover 2.0
Sensor turnover 0.7
Sensor turnover 0.7
3-16
9. Set the 5700A to nominal, than use the knob to adjust for the error display you
recorded in Table 3-3. Set the 5700A to operate. When the U (unsettled)
indicator on the 5700A goes out, press the "DO Step" softkey. The Control
Display changes to:
Calibration: Basic DC
ENTER the exact value to do step.
Voltage= +2.000000
10. At each step you accept the default value by pressing [ENTER]. You do this
because you have already applied your correction in the adjusted 5700A setting.
The display tells you that the calibration step is in progress and informs you with
a beep when the step is complete.
11. When the 5790A completes the step, the next DC step which requires -2 V DC is
presented on the display. Change the 5700A setting accordingly and do the
calibration step as in the previous two steps.
12. Continue until the DC calibration is finished. Table 3-5 lists the steps in periodic
calibration of the main input. The 2.2 mV range is the last DC calibration step.
Table 3-5. Calibration Steps in Periodic Calibration
Voltage to Apply
2 V DC
-2 V DC
0.7 V DC
-0.7 V DC
X W Warning
Note
Tolerance Calibration
Source ( PPM)
3
3
5
Apply +2.0V DC
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Purpose of
Calibration Step
Calibrates DACs and
thermal sensor. (This is
the unscaled range)
Corrects DC turnover
error
Corrects turnover error of
the RMS sensor at
minimum scale. After the
0.7 V step, internally
calibrates the range
zeros
elu027.eps
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