Edge Amplitude Verification; Edge Frequency Verification - Fluke 5520A Service Manual

6-51. Edge Amplitude Verification

For the Edge Amplitude verification, connect the Calibrator Mainframe's SCOPE
connector to the HP 3458A input, using the cable supplied with the Calibrator
Mainframe, the external 50
(The 50 termination is closest to the HP 3458A input.)
1. For measurements of a 1 kHz signal, set the HP 3458A to DCV, NPLC = .01,
LEVEL 1, TRIG LEVEL, and the DELAY to .0002 for measuring the upper part of
the wave form (i.e. topline), and the DELAY to .0007 for measuring the lower part of
the wave form (i.e. baseline). For measurements of a 10 kHz signal, set the HP
3458A to DCV, NPLC = .001, LEVEL 1, TRIG LEVEL, and the DELAY to .00002
for measuring the topline, and the DELAY to .00007 for measuring the baseline.
2. Manually lock the HP 3458A to the range that gives the most resolution for the
baseline measurements. Use this same range for the corresponding baseline
measurements at each step. Note that in the EDGE function, the topline is very near 0
V, and the baseline is a negative voltage. See Table 6-24.
3. For each calibration step, take samples for at least two seconds, using the HP 3458A
MATH functions to enter the average or mean value. See "Setup for SC600 Edge and
Wave Generator Measurements" for more details.
4. The peak-to-peak value of the wave form is the difference between the topline and
baseline measurements, correcting for the load resistance error. To make this
correction, multiply the readings by (0.5 * (50 + Rload)/Rload), where Rload = actual
feedthrough termination resistance. Record each reading as indicated in Table 6-24.
Calibrator HP 3458A
Mainframe Edge Range
Output
100 mV, 1 kHz 100 mV dc
1.00V, 1 kHz 1 V dc
5 mV, 10 kHz 100 mV dc
10 mV, 10 kHz 100 mV dc
25 mV, 10 kHz 100 mV dc
50 mV, 10 kHz 100 mV dc
100 mV, 10 kHz 1 V dc
500 mV, 10 kHz 1 V dc
1.00 V, 10 kHz 1 V dc
2.5 V, 10 kHz 10 V dc

6-52. Edge Frequency Verification

This procedure uses the following equipment:
PM 6680 Frequency Counter with an ovenized timebase (Option PM 9690 or PM
9691)
BNC cable supplied with the SC600
termination, and the BNC(f) to Double Banana adapter.
Table 6-24. Edge Amplification Verification
Topline Baseline
Reading Reading
Peak-to-
Peak-to- Peak x
Peak Correction
SC600 Option 6
Verification
Tolerance
( V)
0.0022
0.0202
0.0003
0.0004
0.0007
0.0012
0.0022
0.0102
0.0202
0.0502
6-35