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Calibration and Verification
Verification
3
3-31
Set the Calibrator Mainframe to the Edge menu. Press
on the Calibrator
Mainframe to activate the output. Then follow these steps to verify Edge frequency.
1.
Set the PM 6680’s FUNCTION to measure frequency on channel A with auto
trigger, measurement time set to 1 second or longer, 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 2.5 V at each frequency listed in Table
3-15.
4.
Allow the PM 6680 reading to stabilize, then record the PM 6680 reading for each
frequency listed in Table 3-15. Compare to the tolerance column of Table 3-15.
Table 3-15. Edge Frequency Verification
Calibrator Mainframe
Frequency
(Output @ 2.5 V p-p)
PM 6680 Reading
(Frequency)
Tolerance
1 kHz
.001 Hz
10 kHz
0.01 Hz
100 kHz
0.1 Hz
1 MHz
1 Hz
10 MHz
10 Hz
3-38. Edge Duty Cycle Verification
This procedure uses the following equipment:
•
PM 6680 Frequency Counter
•
N to BNC cable supplied with the Scope Calibrator
Set the Calibrator Mainframe to the Edge menu. Press
on the Calibrator
Mainframe to activate the output. Then follow these steps to verify Edge duty cycle.
1.
Set the PM 6680’s FUNCTION to measure duty cycle on channel A with auto
trigger, measurement time set to 1 second or longer, 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 2.5 V at 1 MHz.
4.
Allow the PM 6680 reading to stabilize. Compare the duty cycle reading to 50%
±
5%.
3-39. Edge Rise Time Verification
This procedure tests the edge function’s rise time. Aberrations are also checked with the
Tektronix 11801 oscilloscope and SD-22/26 sampling head.
The following equipment is used to verify the edge rise time:
•
High Frequency Digital Storage Oscilloscope: Tektronix 11801 with Tektronix SD-
22/26 sampling head
•
3 dB attenuator, 3.5 mm (m/f)
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