Fluke 225C Service Manual - Page 75

Probe Calibration, Select Probe Type

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5 Calibration Adjustment 5.8 Probe Calibration 5.8 Probe Calibration To meet full user specifications, you need to adjust the supplied red and gray VPS200 voltage probes for optimal response. To adjust the VPS200 probes, do the following: 1. Connect the red probe from the red Input A BNC to the banana jacks. See figure 5-9 ST7991.WMF ST8416.WMF Figure 5-9. 10:1 Probe Calibration Connection Figure 5-10. 10:1 Probe Calibration 2. Press , and then to open the Probe on A menu 3. Select Probe Type: Voltage | Attenuation: 10:1 , Probe Cal... 4. Press to start the probe calibration. A square wave appears on the screen. See Figure 5-10 (the lower half of the screen is covered with operating instructions). 5. Adjust the trimmer screw in the probe housing until a pure square wave is displayed. 6. Press to continue with automatic dc calibration. The test tool automatically calibrates itself to the probe. A message indicates that he dc calibration has been completed successfully. 7. Repeat the procedure for the gray VPS200 probe, connected from the gray Input B BNC to the banana jacks. 5-19

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Calibration Adjustment
5.8 Probe Calibration
5
5-19
5.8 Probe Calibration
To meet full user specifications, you need to adjust the supplied red and gray VPS200
voltage probes for optimal response.
To adjust the VPS200 probes, do the following:
1.
Connect the red probe from the red Input A BNC to the banana jacks.
See figure 5-9
ST8416.WMF
ST7991.WMF
Figure 5-9. 10:1 Probe Calibration Connection
Figure 5-10. 10:1 Probe Calibration
2.
Press
, and then
to open the
Probe on A
menu
3.
Select Probe Type:
Voltage | Attenuation:
10:1 ,
Probe Cal...
4.
Press
to start the probe calibration.
A square wave appears on the screen. See
Figure 5-10
(the lower half of the screen is covered with operating instructions).
5.
Adjust the trimmer screw in the probe housing until a pure square wave is displayed.
6.
Press
to continue with automatic dc calibration.
The test tool automatically calibrates itself to the probe.
A message indicates that he
dc calibration has been completed successfully.
7.
Repeat the procedure for the gray VPS200 probe, connected from the gray Input B
BNC to the banana jacks.