Fluke 5500A, Service Manual

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SC600 Option
Calibration and Verification of Square Wave Voltage Functions
6
6-21
6-33. DC Voltage Calibration
This procedure uses the following equipment:
•
Hewlett-Packard 3458A Digital Multimeter
•
BNC(f) to Double Banana adapter
•
BNC cable supplied with the SC600
Note
Calibrating DC Voltage requires AC Voltage calibration.
Refer to Figure 6-3 for the proper setup connections.
Set the Calibrator Mainframe in Scope Cal mode, DC Voltage section. Then follow these
steps to calibrate DC Voltage.
1. Connect the Calibrator Mainframe’s SCOPE connector to the HP 3458A input, using
the BNC cable and the BNC(f) to Double Banana adapter.
2. Set the HP 3458A to DCV, Auto Range, NPLC = 10, FIXEDZ = on.
3. Press the GO ON blue softkey.
4. Ensure the HP 3458A reading is 0.0 V DC
±
10
µ
V. If not, adjust R121 on A41.
R121 is a square, single-turn pot and is marked on the board located near Q29.
5. Press the GO ON blue softkey.
6. Calibration voltages 33 V and greater will automatically put the Calibrator
Mainframe output in standby. When this occurs, press
O
on the Calibrator
Mainframe to activate the output. Allow the HP 3458A DC voltage reading to
stabilize. Enter the reading via the Calibrator Mainframe front panel keypad, then
press ENTER.
Note
The Calibrator Mainframe will warn when the entered value is out of
bounds. If this warning occurs recheck the setup and carefully re-enter
the reading insuring proper multiplier (i.e., m,
µ
, n, p). If the warning still
occurs, repair may be necessary.
7. Repeat steps 6 until the Calibrator Mainframe display indicates that the next steps
calibrate AC Voltage. Press the OPTIONS, then STORE CONSTS blue softkeys to
store the new calibration constants.
AC Voltage must now be calibrated: continue with the next section.
6-34. AC Voltage Calibration
This procedure uses the same equipment and setup as DC Voltage calibration.Refer to
Figure 6-3. DC voltages are measured and entered in the Calibrator Mainframe to
calibrate the AC Voltage function.
Set up the Calibrator Mainframe to Cal ACV. Press OPTIONS and NEXT SECTION
blue softkeys until the display reads “The next steps calibrate -SC600 ACV”. Then
follow these steps to calibrate AC Voltage.
1. Press the GO ON blue softkey.
2. Allow the HP 3458A DC voltage reading to stabilize. Enter the reading via the
Calibrator Mainframe front panel keypad, then press ENTER.