Fluke 5500A, Service Manual

Page: 217 / 296

SC300 Option
Verification
6
6-91
1. Set the PM 6680’s FUNCTION to measure frequency on channel A with auto
trigger, measurement time set to 1 second or longer, 1M
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 2.1 V at each frequency listed in Table
6-53.
4. Allow the PM 6680 reading to stabilize, then record the PM 6680 reading for each
frequency listed in Table 6-53. Compare to the tolerance column of Table 6-53.
Table 6-53. AC Voltage Frequency Verification
Calibrator Mainframe
Frequency
(output @ 2.1 V p-p)
PM 6680 Reading
(Frequency) Tolerance
10 Hz 0.01525 Hz
100 Hz 0.0175 Hz
1 kHz 0.04 Hz
10 kHz 0.265 Hz
6-119. 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
Ω
termination, and the BNC(f) to Double Banana adapter.
(The 50
Ω
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 6-54.
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 Square Wave
Measurements” earlier in this section 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
6-54.