Fluke 125B/S Calibration Guide - Page 24

Input A Frequency Response Upper Transition Point Test, Input A Frequency Measurement Accuracy Test

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123B/124B/125B Calibration Manual Input A Frequency Response Upper Transition Point Test To test the Input A frequency response upper transition point: 1. Connect the Test Tool to the Calibrator. See Figure 3. 2. Set up the Test Tool: a. Push to select auto ranging (AUTO shows at the top of the display). Note For this procedure, do not push  . b. Push  or  to change the sensitivity, to select manual sensitivity ranging, and to lock the Input A sensitivity on 200 mV/div. 3. Set up the Calibrator: a. Supply a leveled sine wave of 1.2 V peak-to-peak, 50 kHz (SCOPE output, MODE levsine). b. Push . 4. Adjust the amplitude of the sine wave to 6 divisions. 5. On the Calibrator, supply 20 MHz (123B) or 40 MHz (124B/125B), but do not change the amplitude. 6. Make sure that the Input A trace is ≥4.2 divisions. Note The lower transition point is tested in Input A and Input B AC Input Coupling Test on page 25. Input A Frequency Measurement Accuracy Test To test the Input A frequency measurement accuracy: 1. Connect the Test Tool to the Calibrator. See Figure 3. 2. Set up the Test Tool: a. Push to select auto ranging (AUTO shows at the top of the display). b. Push . c. Push  to open the INPUT A MEASUREMENTS menu. d. Select Hz. e. Push  twice to close the menu. 3. Set up the Calibrator: a. Supply a leveled sine wave of 1 MHz @ 600 mV peak-to-peak (SCOPE output, MODE levsine). b. Push . 4. For each Output in Table 3: a. On the Calibrator, supply the frequency listed. Start with 1 MHz. b. Compare the Input A main reading on the Test Tool with the reading range listed in Table 3. Table 3. Input A, B Frequency Measurement Accuracy Test Calibrator output, 600 mVpp 1 MHz 10 MHz 40 MHz 60 MHz (124B/125B only) Input A, B Reading 0.993 MHz to 1.007 MHz 09.88 MHz to 10.12 MHz 38.98 MHz to 41.02 MHz 58.48 MHz to 61.52 MHz Note Because the Duty Cycle and Pulse Width measurements are based on the same principles as Frequency measurements, the Duty Cycle and Pulse Width measurement function are not verified separately. 16

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123B/124B/125B
Calibration Manual
16
Input A Frequency Response Upper Transition Point Test
To test the Input A frequency response upper transition point:
1.
Connect the Test Tool to the Calibrator. See Figure 3.
2.
Set up the Test Tool:
a.
Push
to select auto ranging (AUTO shows at the top of the display).
Note
For this procedure, do not push
.
b.
Push
or
to change the sensitivity, to select manual sensitivity ranging, and to lock the Input A
sensitivity on 200 mV/div.
3.
Set up the Calibrator:
a.
Supply a leveled sine wave of 1.2 V peak-to-peak, 50 kHz (SCOPE output, MODE levsine).
b.
Push
.
4.
Adjust the amplitude of the sine wave to 6 divisions.
5.
On the Calibrator, supply 20 MHz (123B) or 40 MHz (124B/125B), but do not change the amplitude.
6.
Make sure that the Input A trace is
≥
4.2 divisions.
Note
The lower transition point is tested in Input A and Input B AC Input Coupling Test on
page 25.
Input A Frequency Measurement Accuracy Test
To test the Input A frequency measurement accuracy:
1.
Connect the Test Tool to the Calibrator. See Figure 3.
2.
Set up the Test Tool:
a.
Push
to select auto ranging (AUTO shows at the top of the display).
b.
Push
.
c.
Push
to open the INPUT A MEASUREMENTS menu.
d.
Select
Hz
.
e.
Push
twice to close the menu.
3.
Set up the Calibrator:
a.
Supply a leveled sine wave of 1 MHz @ 600 mV peak-to-peak (SCOPE output, MODE levsine).
b.
Push
.
4.
For each Output in Table 3:
a.
On the Calibrator, supply the frequency listed. Start with 1 MHz.
b.
Compare the Input A main reading on the Test Tool with the reading range listed in Table 3.
Note
Because the Duty Cycle and Pulse Width measurements are based on the same
principles as Frequency measurements, the Duty Cycle and Pulse Width measurement
function are not verified separately.
Table 3. Input A, B Frequency Measurement Accuracy Test
Calibrator output, 600 mVpp
Input A, B Reading
1 MHz
0.993 MHz to 1.007 MHz
10 MHz
09.88 MHz to 10.12 MHz
40 MHz
38.98 MHz to 41.02 MHz
60 MHz (124B/125B only)
58.48 MHz to 61.52 MHz