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5820A
Service Manual
3-56
3-57. Pulse Period Verification
This procedure uses the following equipment:
•
PM 6680 Frequency Counter with an ovenized timebase (Option PM 9690 or
PM 9691)
•
N to BNC cable supplied with the Scope Calibrator
Set the Calibrator Mainframe to the Pulse menu. Press
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,
DC couple, 50
Ω
impedance, and filter off.
2.
Using the N to BNC cable, connect the CHAN 1 connector on the Calibrator
Mainframe to PM 6680 channel A.
3.
Program the Calibrator Mainframe to output the pulse width and period (at 1.5 V) as
listed in Table 3-28.
4.
Allow the PM 6680 reading to stabilize, then record the PM 6680 reading for each
period listed for the Calibrator Mainframe.
Table 3-28. Pulse Generator Verification: Period
Nominal Value
(V p-p)
Pulse Width
(s)
Period
(s)
Measured
Value (s)
Deviation
(s)
1-Year Spec.
(s)
1.5
5.0 x 10
-9
200 x 10
-9
66 x 10
-15
1.5
500 x 10
-9
0.01
3.3 x 10
-9
1.5
500 x 10
-9
0.02
6.6 x 10
-9
3-58. 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 N to BNC cable supplied with the Scope Calibrator. 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 M
Ω
, 1 M
Ω
, 60
Ω
, 50
Ω
, 40
Ω
nominal
•
adapters to connect resistors to BNC(f) connector
•
N to BNC cable supplied with the Scope Calibrator
Set the Calibrator Mainframe to the MeasZ menu. Follow these steps to verify the
MeasZ resistance function.
1.
Set the Calibrator Mainframe MeasZ resistance range as indicated in Table 3-26.
(The blue softkey under MEASURE toggles the MeasZ ranges).
2.
Using the N to BNC cable, connect the CHAN 1 connector to the BNC(f) connector
attached to the nominal resistance values indicated in Table 3-26. The 600 K
Ω
nominal value can be achieved by connecting the 1.5 M
Ω
and 1 M
Ω
resistors in
parallel.
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