Appendix C: Operator Performance Check
Turn the HORIZONTAL SCALE knob to the left until horizontal scale is maximized.
Using the M-FUNC button and M-FUNCTION knob, set Vp to 1.
With the HORIZONTAL SCALE knob, position a cursor at the most far right position possible.
The absolute distance measurement for the cursor is the upper limit for cursor readout range.
This number should be larger than 10000 meters or 33000 feet.
Position a cursor at the most far left position.
The absolute distance measurement for the cursor is the lower limit for cursor readout range. This
number should be less than -1 foot (-0.3 meters).
Cursor Readout Resolution Check
Cursor Readout Resolution Check
Use the HORIZONTAL SCALE knob to set the horizontal scale to 0.00330 feet/div or 0.001
meters/div.
Position a cursor on the screen and note the absolute distance measurement for the cursor.
Move the cursor the smallest possible step using the HORIZONTAL POSITION knob. The
difference between the new distance measurement and the previous is the minimum cursor
readout resolution.
Distance Measurement Accuracy Check
Distance Measurement Accuracy Check
Accuracy is determined by taking a cable of known length and velocity and comparing the known
values against measured values. Accuracy is reported as a percentage. When determining
accuracy, ensure that Horizontal Calibration has been performed accurately.
Accuracy should be checked for short, medium, and long pulse settings.
Ohm Readout Range Check
Ohm Readout Range Check
Connect the 36-inch calibration cable to the CT100.
Position a cursor on the trace well beyond the end of the cable. The vertical impedance
measurement should read >=1k ohm.
Position a cursor on the trace well before the leading edge of the pulse. The vertical impedance
measurement should read <= 1 ohm.
Resolution Check
Resolution Check
Position a cursor at a point of the trace where the vertical impedance measurement is greater than
1 ohm and less than 1000 Ohms. The CT100 should display 3 digits for this measurement.
76 Mohr CT100 / CT100HF Operator's Manual
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