5520A
Service Manual
6-54
6-70. Pulse Period Verification
This procedure uses the following equipment:
• PM 6680 Frequency Counter with an ovenized timebase (Option PM 9690 or PM
9691)
• BNC cable supplied with the SC600
Refer to Figure 6-6 for the proper setup connections. Set the Calibrator Mainframe to
SCOPE mode, with the Pulse menu on the display. Press O on the Calibrator
Mainframe to activate the output. Then follow these steps to verify the Pulse period.
1. Set the PM 6680’s FUNCTION to measure period on channel A with auto trigger,
measurement time set to 1 second or longer, 50 Ω impedance, and filter off.
2. Using the BNC cable, connect the SCOPE connector on the Calibrator Mainframe to
PM 6680 channel A.
3. Program the Calibrator Mainframe to output the pulse width and period (at 2.5 V) as
listed in Table 6-38.
4. Allow the PM 6680 reading to stabilize, then record the PM 6680 reading for each
period listed for the Calibrator Mainframe. Compare to the tolerance column of Table
6-38.
Table 6-38. Pulse Period Verification
Calibrator Mainframe
Output
PM 6680 Reading
Width Period (Period) Tolerance
80 ns 200 ns 5E-13 s
500 ns 10 ms 2.5E-08 s
500 ns 20 ms 5.0E-08 s
6-71. MeasZ Resistance Verification
The MeasZ resistance function is verified by measuring resistors of known values. The
measurement value is then compared to the resistor actual value.
The resistors must make a solid connection to a BNC(f) to enable a connection to the end
of the BNC cable supplied with the SC600. The resistance values must be known at this
BNC(f) connector. Fluke uses an HP 3458A DMM to make a 4-wire ohms measurement
at the BNC(f) connector to determine the actual resistance values.
This procedure uses the following equipment:
• Resistors of known values: 1.5 MΩ, 1 MΩ, 60 Ω, 50 Ω, 40 Ω nominal
• adapters to connect resistors to 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 resistance function.
1. Set the Calibrator Mainframe MeasZ resistance range as indicated in Table 6-39.
(The blue softkey under MEASURE toggles the MeasZ ranges).
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