Appendix C: Operator Performance Check
Vertical Accuracy Check
Vertical Accuracy Check
Vertical accuracy is checked by comparing CT100 resistance (impedance) measurements against
a known value. The supplied 50 Ω terminator is required.
To view vertical accuracy, the impedance at cursor must be displayed. Enable impedance at
cursor readings from within the Display submenu.
To determine vertical accuracy, connect a 50 Ω terminator onto the front panel cable connector.
Move a cursor out to a length greater than 1m. Impedance may change a small amount from
point to point. An average impedance amongst a number of points along the trace determines
vertical accuracy.
Impedance at cursor should be between 45 and 55 Ohms.
Vertical accuracy should be checked for short, medium, and long maximum cable lengths.
Horizontal Scale Check
Horizontal Scale Check
From the Main menu, choose the cable length so that it is set to long maximum cable length.
Using the M-FUNC button and M-FUNCTION knob, set Vp to 1.00.
Turn the HORIZONTAL SCALE knob to the left. Horizontal scale should increase beyond 61
meters/div or 200 feet/div.
Turn the HORIZONTAL SCALE knob to the right. Horizontal scale should decrease below 0.01
meters/div or 0.03 feet/div.
Horizontal Range Check
Horizontal Range Check
See the cursor readout range instructions above. Horizontal range and cursor readout range are
always equal.
Horizontal Position Check
Horizontal Position Check
This test is passed implicitly when the Cursor Readout Range and Horizontal Range checks are
passed.
Pulse Frequency Check
Pulse Frequency Check
Pulse frequency measurement should be taken with a device that can accurately measure
frequency, pulse width, period, and amplitude.
Connect one end of the 36-inch calibration cable to a capable pulse measurement device and the
other end of the 36-inch calibration cable to the CT100 front panel cable connector. A waveform
Mohr CT100 / CT100HF Operator's Manual 77
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