Fluke 5500A, Service Manual

Page: 219 / 296

SC300 Option
Verification
6
6-93
6-121. Edge Duty Cycle Verification
This procedure uses the following equipment:
•
PM 6680 Frequency Counter
•
BNC cable supplied with the SC300
Refer to Figure 6-21 for proper setup connections. Set the Calibrator Mainframe to
SCOPE mode, with the Edge menu on the display. Press
O
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 BNC cable, connect the SCOPE 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%.
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.
•
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
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.
Set the scope trigger amplitude to “divide by 10”.