Fluke 5790A Service Manual page 92

5790A
Service Manual
It is not necessary to characterize the 5440B prior to performing the
following steps in order to meet the test uncertainty requirements for the
5790A.
3-12
the 5440B output for a null. Repeat this procedure until you obtain a null of
1 V. Set the 845A( ) OPR/ZERO to ZERO and set the 5700A to STANDBY.
Record the 5440B voltage indication in Table 3-3 after "5440B
CHARACTERIZED 6 V OUTPUT". Set the 5440B to STANDBY.
21. Set the 5700A to 2 V, OPERATE. Set the 5440B to 2 V, OPERATE. Edit the
5700A output until the Error Display matches that recorded in Table 3-2 for a
+2 V output. Set the 845A( ) range to 10 mV. Set the 845A( ) OPR/ZERO to
OPR. Reduce the 845A( ) range switch setting until the largest on-scale reading
is obtained. Adjust the 5440B for a null. Repeat this procedure until you obtain a
null of 1 V. Set the 845A( ) OPR/ZERO to ZERO and set the 5700A to
STANDBY. Record the 5440B Voltage indication in Table 3-3 after "5440B
CHARACTERIZED 2 V OUTPUT". Set the 5440B to STANDBY.
22. Set the 752A MODE switch to 1 V.
23. Set the 5440B output to the characterized 6 V output recorded in Table 3-3,
OPERATE. Set the 5700A to +0.6 V, OPERATE. Set the 845A( ) to the 10 mV
range. Reduce the 845A( ) range switch setting until the largest on-scale reading
is obtained. Adjust the 5700A for a null. Repeat this procedure until you obtain a
null of 0.1 V. Record the 5700A Error Display indication opposite +0.6 V in
Table 3-3. Set the 5700A to STANDBY.
24. Press CHNG SIGN on the 5440B. Set the 5700A to -0.6 V, OPERATE. Set the
845A( ) to 10 mV range. Repeat the nulling procedure of step 26, recording the
5700A Error Display indication opposite to -0.6 V in Table 3-3. Set the 5700A to
STANDBY.
25. Set the 5440B output to the characterized 2 V output recorded in Table 3-3,
OPERATE. Set the 5700A to +0.2 V, OPERATE. Set the 845A( ) to 10 mV
range. Repeat the nulling procedure of step 26, recording the 5700A Error
Display indication opposite to +0.2 V in Table 3-3. Set the 5700A to STANDBY.
26. Press CHNG SIGN on the 5440B. Set the 5700A to -0.2 V, OPERATE. Set the
845A( ) to the 10 mV range. Repeat the nulling procedure of step 26, recording
the 5700A Error Display indication opposite to -0.2 V in Table 3-3. Set the
5700A to STANDBY.
27. Set the 752A MODE switch to 0.1 V.
28. Repeat the procedure described in steps 26 through 29 for 5700A outputs of
+0.06, -0.06, +0.02, and -0.02 V, entering the Error Display indications in
Table 3-3.
29. Set the 5440B to output 0.6 V. Repeat the procedure described in steps 26 and 27
for 5700A outputs of +0.006 and -0.006 V entering the Error Display indications
in Table 3-3.
30. Set the 5440B to output 0.2 V. Repeat the procedure described in steps 27 and 28
for 5700A outputs of +0.002 and -0.002 V entering the Error Display indications
in Table 3-3.
31. DC source characterization is now complete. Set all outputs to standby and
remove all connections.
Note