Fluke 125B/S Calibration Guide - Page 26

Input B Frequency Response Upper Transition Point Test, Input B Trigger Sensitivity Test

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123B/124B/125B Calibration Manual Input B Frequency Response Upper Transition Point Test To test the Input B frequency response upper transition point: 1. Connect the Test Tool to the Calibrator. See Figure 4. 2. Set up the Test Tool: a. Turn on Input B if necessary. b. Push . Note For this procedure, do not push  . c. Use  and  to change the sensitivity setting to manual sensitivity ranging and lock the Input B sensitivity on 200 mV/div. d. Push . e. Push to open the SCOPE SETTINGS menu. f. Make these selections: • Trigger Input: B • Update: Free Run • Type: Normal • Waveform: Normal 3. Set up the Calibrator: a. Supply a leveled sine wave of 50 kHz @ 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) without changing the amplitude. 6. Make sure the Input B 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 B Trigger Sensitivity Test To test the Input B trigger sensitivity: 1. Connect the Test Tool to the Calibrator. See Figure 4. 2. Set up the Test Tool: a. Turn on Input B if necessary. b. Push to select auto ranging (AUTO shows at the top of the display). Note For this procedure, do not push . c. Push  or  to change the sensitivity setting to manual sensitivity ranging and lock the Input B sensitivity on 200 mV/div. d. Push . e. Push to open the SCOPE SETTINGS menu. f. Make these selections: • Select Trigger Input: B • Update: Free Run • Type: Normal • Waveform: Normal. 3. Set up the Calibrator: a. Supply a 5 MHz leveled sine wave of 100 mV peak-to-peak (SCOPE output, MODE levsine). b. Push . 18

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123B/124B/125B
Calibration Manual
18
Input B Frequency Response Upper Transition Point Test
To test the Input B frequency response upper transition point:
1.
Connect the Test Tool to the Calibrator. See Figure 4.
2.
Set up the Test Tool:
a.
Turn on Input B if necessary.
b.
Push
.
Note
For this procedure, do not push
.
c.
Use
and
to change the sensitivity setting to manual sensitivity ranging and lock the Input B sensitivity
on 200 mV/div.
d.
Push
.
e.
Push
to open the SCOPE SETTINGS menu.
f.
Make these selections:
•
Trigger Input:
B
•
Update:
Free Run
•
Type:
Normal
•
Waveform:
Normal
3.
Set up the Calibrator:
a.
Supply a leveled sine wave of 50 kHz @ 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) without changing the amplitude.
6.
Make sure the Input B 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 B Trigger Sensitivity Test
To test the Input B trigger sensitivity:
1.
Connect the Test Tool to the Calibrator. See Figure 4.
2.
Set up the Test Tool:
a.
Turn on Input B if necessary.
b.
Push
to select auto ranging (AUTO shows at the top of the display).
Note
For this procedure, do not push
.
c.
Push
or
to change the sensitivity setting to manual sensitivity ranging and lock the Input B sensitivity
on 200 mV/div.
d.
Push
.
e.
Push
to open the SCOPE SETTINGS menu.
f.
Make these selections:
•
Select Trigger Input:
B
•
Update:
Free Run
•
Type:
Normal
•
Waveform:
Normal
.
3.
Set up the Calibrator:
a.
Supply a 5 MHz leveled sine wave of 100 mV peak-to-peak (SCOPE output, MODE levsine).
b.
Push
.