Fluke 5500A, Service Manual

Page: 184 / 296

5500A
Service Manual
6-58
2. Using the BNC cable, connect the SCOPE connector to the BNC(f) connector
attached to the nominal resistance values indicated in Table 6-45. The 600 K
Ω
nominal value can be achieved by connecting the 1.5 M
Ω
and 1 M
Ω
resistors in
parallel.
3. Allow the Calibrator Mainframe reading to stabilize, then record the Calibrator
Mainframe resistance reading for each nominal value listed in Table 6-45. Compare
the Calibrator Mainframe resistance readings to the actual resistance values and the
tolerance column of Table 6-45.
Table 6-45. MeasZ Resistance Verification
Calibrator
Mainframe
MeasZ
Range
Nominal
Resistance
Value
Calibrator
Mainframe
Resistance
Reading
Actual
Resistance
Value
Tolerance
res 50
Ω
40
Ω
0.04
Ω
res 50
Ω
50
Ω
0.05
Ω
res 50
Ω
60
Ω
0.06
Ω
res 1M
Ω
600 k
Ω
600
Ω
res 1M
Ω
1 M
Ω
1 k
Ω
res 1M
Ω
1.5 M
Ω
1.5 k
Ω
6-72. MeasZ Capacitance Verification
The MeasZ capacitance function is verified by measuring capacitors of known values.
The measurement value is then compared to the capacitor actual value.
The capacitors must make a solid connection to a BNC(f) to enable a connection to the
end of the BNC cable supplied with the SC600. Due to the small capacitance values, care
must be taken to know the actual capacitance at this BNC(f) connector. The capacitance
values must be determined at a 10 MHz oscillator frequency. Fluke uses an HP 4192A
Impedance Analyzer at 10 MHz to determine the actual capacitance values.
This procedure uses the following equipment:
•
Adapters and capacitors to achieve 5 pF, 29 pF, 49 pF nominal values at the end of
BNC(f) connector
•
BNC cable supplied with the SC600
Refer to Figure 6-17 for the proper setup connections.
Set the Calibrator Mainframe to SCOPE mode, with the MeasZ menu on the display.
Then follow these steps to verify the MeasZ capacitance function.
1. Set the Calibrator Mainframe MeasZ capacitance range to cap. (The blue softkey
under MEASURE toggles the MeasZ ranges).
2. Connect the BNC cable to the Calibrator Mainframe SCOPE connector, but do not
connect any thing to the end of this cable.
3. Allow the Calibrator Mainframe reading to stabilize, then press the SET OFFSET
blue softkey to zero the capacitance reading.
4. Connect the end of the BNC cable to the BNC(f) connector attached to the nominal
capacitor values indicated in Table 6-46.