5500A
Service Manual
6-36
• BNC cable supplied with the SC600
Refer to Figure 6-6 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 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, 50Ω 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 each frequency listed in Table
6-25.
4. Allow the PM 6680 reading to stabilize, then record the PM 6680 reading for each
frequency listed in Table 6-25. Compare to the tolerance column of Table 6-25.
Table 6-25. Edge Frequency Verification
Calibrator Mainframe
Frequency
(output @ 2.5 V p-p)
PM 6680 Reading (Frequency) Tolerance
1 kHz 0.0025 Hz
10 kHz 0.025 Hz
100 kHz 0.25 Hz
1 MHz 2.5 Hz
10 MHz 25 Hz
6-53. Edge Duty Cycle Verification
This procedure uses the following equipment:
• PM 6680 Frequency Counter
• BNC cable supplied with the SC600
Refer to Figure 6-6 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%.
6-54. 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.
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