3. Getting Started
8. VERTICAL SCALE knob. Controls the vertical scale, which is displayed on the bottom of
the screen. This control modifies the appearance of the currently selected trace. The scale is
expanded about the vertical center of the screen.
9. HORIZONTAL POSITION knob. Controls the horizontal position of the active cursor.
Displayed trace positions are moved horizontally if the cursor is moved toward the edge of the
screen to keep the cursor on-screen.
10. HORIZONTAL SCALE knob. Controls the horizontal scale of displayed traces. The scale is
expanded about the active cursor.
11. BNC or SMA test port. This connects to the cable to be tested. Be sure to properly ground
the cable before connecting it to the test port in order to prevent electrostatic damage to the
CT100B’s sensitive sampling circuitry.
CAUTION: All static charge must be drained from the cable to be tested
prior to connecting to the test port (11). This is done by shorting the
cable center conductor to the cable sheath/ground return. If this procedure
is not followed, the sampling electronics can be damaged and will void the
Warranty.
12. Host USB port. This USB (V1.1) connection can be used to interface to a client USB device
such as a barcode reader, keyboard, or flash drive.
13. FILE button. Opens the File menu, which contains a database of user configurations, saved
cable records (scans), and a Vp database for known cable types.
14. SELECT button. Used to select between traces on the screen. It has no effect if there are no
other traces. Note: While the SELECT button is held down, press the M-FUNC button.
The CT100B will generate a screenshot that can be saved to a USB drive.
15. CURSOR button. This button is used to toggle between the two available cursors. Pressing
and holding the CURSOR button for one second and then releasing the button will bring
both cursors onto the screen.
16. SCAN button. Opens the Scan menu, which lets you scan, save, and hide traces.
17. AUTOFIT/HELP (orange) button. Opens the on-screen help library along with Autofit
soft-menu options.
18. M-FUNC (multifunction) button. The function of the M-FUNCTION knob (19) is set by
this button. The current operation is displayed on the screen (top-center).
19. M-FUNCTION (multifunction) knob. This knob adopts the function selected through the
use of the M-FUNC button (18). It also allows users to scroll through dialog box options.
20. V1 function button. Function depends on menu.
21. V2 function button. Function depends on menu.
22. V3 function button. Function depends on menu.
23. V4 function button. Function depends on menu.
3.7. Rear Panel Connectors and Switches
The following numbered items describe the connectors and switches identified in the rear panel
diagram (Figure 3.3).
24. 24 VDC power adapter plug. The provided 24 VDC AC adapter plugs into this port. Only
MOHR-approved positive center tip, 24 V adapters may be used.
CT100B TDR Cable Analyzers Operator’s Manual 13
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