Edge Duty Cycle Verification; Edge Rise Time Verification - Fluke 5520A Service Manual

5520A
Service Manual

6-121. Edge Duty Cycle Verification

This procedure uses the following equipment:
Refer to Figure 6-21 for proper setup connections. Set the Calibrator Mainframe to
SCOPE mode, with the Edge menu on the display. Press
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
2. Using the BNC cable, connect the SCOPE connector on the Calibrator Mainframe to
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%

6-122. 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.
Connect the BNC cable supplied with the SC300 to the Calibrator Mainframe's SCOPE
connector. Connect the other end of the BNC cable to one BNC(f) to 3.5 mm(m) adapter
then to the DSO's sampling head through the 3 dB attenuator.
Using the second BNC(f) to 3.5 mm(m) adapter and BNC cable, connect the Calibrator
Mainframe's TRIG OUT connector to the 11801's Trigger Input. Refer to Figure 6-22.
6-92
PM 6680 Frequency Counter
BNC cable supplied with the SC300
trigger, measurement time set to 1 second or longer, 50
PM 6680 channel A.
5%.
High Frequency Digital Storage Oscilloscope: Tektronix 11801 with Tektronix SD-
22/26 sampling head
3 dB attenuator, 3.5 mm (m/f)
BNC(f) to 3.5 mm(m) adapter (2)
BNC cable supplied with the SC300
second BNC cable
on the Calibrator
impedance, and filter off.