Verification At 50 - Fluke 5520A Service Manual

6-49. Verification at 50

For the 50 verification, connect the Calibrator Mainframe's SCOPE connector to the
HP 3458A input, using the cable supplied with the Calibrator Mainframe, the external 50
termination, and the BNC(f) to Double Banana adapter. (The 50
closest to the HP 3458A input.) Connect the Calibrator Mainframe TRIG OUT connector
to the HP 3458A Ext Trig connector located on the rear of that instrument. Make sure the
Calibrator Mainframe impedance is set to 50 . (The blue softkey under Output @
toggles the impedance between 50
1. Set the HP 3458A to DCV, NPLC = .01, TRIG EXT, and the DELAY to .0007 for
measuring the topline of the wave form, and the DELAY to .0012 for measuring the
baseline of the wave form. Manually lock the HP 3458A to the range that gives the
most resolution for the topline measurements. Use this same range for the
corresponding baseline measurements at each step. See Table 6-22.
2. Enable the Calibrator Mainframe external trigger by toggling the blue softkey under
TRIG to /1.
3. Measure the topline first, as indicated in Table 6-22. For each measurement, take
samples for at least two seconds, using the HP 3458A MATH functions to determine
the average or mean value. See "Setup for SC600 Voltage Square Wave
Measurements" for more details.
4. Measure the baseline of each output after the corresponding topline measurement, as
indicated in Table 6-22. The peak-to-peak value is the difference between the topline
and baseline measurements. Compare the result to the tolerance column.
Calibrator
Mainframe
HP 3458A
Output
Range
(1 kHz)
1 mV 100 mV dc
-1 mV 100 mV dc
10 mV 100 mV dc
-10 mV 100 mV dc
25 mV 100 mV dc
-25 mV 100 mV dc
110 mV 100 mV dc
-110 mV 100 mV dc
500 mV 1 V dc
-500 mV 1 V dc
2.2 V 10 V dc
-2.2 V 10 V dc
6.6 V 10 V dc
-6.6 V 10 V dc
and 1 M ). Proceed with the following steps:
Table 6-22. AC Voltage Verification at 50
Topline Baseline
Reading Reading
termination is
Peak-to-Peak Peak-to-Peak x
Correction
SC600 Option 6
Verification
Tolerance
( V)
0.000043
0.000043
0.000065
0.000065
0.000103
0.000103
0.000315
0.000315
0.00129
0.00129
0.00554
0.00554
0.01654
0.01654
6-33