Appendix D: Calibration Procedures
2) Ensure that smoothing is set to 1 by pressing the M-FUNC button (Button 18) until the device
displays the smoothing value. Rotate the M-FUNCTION knob counter-clockwise until the
smoothing value is set to 1.
3) Set Vp to a value greater than 0.700 by pressing the M-FUNC button (Button 18) until the
device displays the Coarse Vp value. Rotate the M-FUNCTION knob until the current Vp is
greater than 0.700. Ideally the Vp used should be that of the supplied 36-inch calibration
cable. Refer to the label attached to the 36-inch cable for a precise Vp.
4) Set the CT100 to use meters as the length unit. From the main screen press the blue MENU
button. Select the Measurement submenu (Button 2). The menu item above Button 4 displays
the current units. Press Button 4 until the menu displays “Units meters.”
5) Also on the Measurement menu, set Oversample to “off.”
The following checks and steps must be performed in the order described. The
first procedure may be skipped if pulse verification is unnecessary.
Pulse measurement checks (optional)
Pulse measurement checks (optional)
Pulse measurements should be taken with a device that can accurately measure frequency, pulse
width, period, and amplitude.
Connect the CT100 to a capable device using the 36-inch calibration cable. Switch the CT100
into the short pulse setting from the Main menu. Measure each pulse value and compare it
against the values given in the supplied CT100 Calibration Certificate. If a certificate is
unavailable, the published specifications listed in Appendix A may be used as a basis for
comparison. If values fall outside of specifications, discontinue calibration and refer to the
Troubleshooting section of the Technical Service manual. Repeat value comparison for medium
and long maximum cable lengths.
Turn off temperature adjustment
Turn off temperature adjustment
Temperature adjustment must be disabled to complete the manual calibrations. To disable
automatic temperature adjustment:
1) Press the blue MENU button repeatedly until the Main menu appears.
2) Enter the Diagnostics submenu.
3) Enter the Calibration submenu.
4) Read the displayed warning message and select OK to continue.
5) Disable temperature adjustment. Temperature adjustment is disabled when there are no
asterisks bracketing the menu item.
80 Mohr CT100 / CT100HF Operator's Manual
To Next Page
Loading...