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Probe Calibration Generator Test
To calibrate, connect a 10:1 or 100:1 probe as supplied with the Test Tool to input A (red
probe). Connect the probe tip and the probe ground lead with the probe cal terminals on the
lower left side of the Test Tool. See
with four oscilloscope channels such as the model 190-204 or 190M-4).
1. Reset the Test Tool.
A
2. Press
to show the input A key labels.
E
3. Press
to select the 10:1 or 100:1 voltage probe for the calibration.
E
4. Press
to confirm and
3
5. Press
1
6. Press
4
7. Press
square wave response to a pure square wave (pulse top must be straight). The trimmer is
located in the probe housing near the BNC and can be reached by rotating the center part
of the housing. For further information refer to the probe instruction sheet.
8. When done, press
Calibration is OK if all instructions shown on the display are finished successfully.
Close the hole of the trimmer by rotating the center part of the housing. This is important
for safe use of the probe at high input voltages.
9. Repeat the procedure for channel B (blue probe). For the 4-channel test tools, repeat the
procedure for channel C (gray probe) and channel D (green probe).
This is the end of the Performance Verification Procedure.
Figure 12
1
(-PROBE A 10:1 ....).
(- PROBE CAL...) and follow the instructions on the display.
to start the probe calibration. The first step is to manually adjust the
4
to start the DC calibration automatically. The Probe
Figure 12. Probe Calibration Connection
Probe Cal
Probe Cal Reference
VPS421 does not need adjustment.
(the figure is universal and shows a Test Tool
to reopen the probe menu.
Note
ScopeMeter® Test Tool
Performance Verification
33
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