Fluke 271-U 115V Product Manual - Page 32

271 Users Manual Numeric entries are automatically confirmed when the appropriate unit key (Hz, kHz, MHz, etc.) is pressed but ENTER can be used to enter a number in the parameter's basic units or to confirm entries with fixed units (e.g. phase) or no units (e.g. burst count). It is also used to confirm certain options when prompted. Pressing ESCAPE returns a setting being edited to its last value; a second press (when appropriate) will return the display from an edit menu to the main menu. CE (Clear Entry) undoes a numeric entry digit by digit. Further explanations will be found as appropriate in the detailed descriptions of the generator's functions. Principles of Editing FIELD and DIGIT keys are used, together with the rotary control, to edit parameters shown on the current menu. The main menu shows all the basic generator parameters and is the one displayed unless editing of a special function has been selected. These edit menus are accessed by pressing the EDIT key, followed by the appropriate MODE key or a numeric key which has a secondary function printed in red to the right of the numeric digit. FIELD keys move the flashing edit cursor forward or backwards from one editable field to the next; all the digits of a numeric parameter value are treated as a single field. When the parameters of a particular function occupy two or more pages of the display, e.g. the sweep mode parameters, the further pages are indicated by MORE>>> shown in the display. In this case the FIELD keys also step between the last field on one page and the first field on the next, and back again. The attributes of the flashing edit cursor can be changed by the user if desired, as described in chapter 12, System Operations. DIGIT keys operate in more than one mode. When a numeric parameter value field is selected by the FIELD keys, DIGIT keys step the edit cursor forwards or backwards through the digits of the field. When the edit cursor is positioned in a parameter name (for example FREQ) pressing either digit key will step the parameter through each of the alternative forms in which a value may be entered (for example, FREQ changes to PERiod). The parameter's numeric value and units change accordingly. Note that where there is no alternative form for the parameter (for example, SYMMETRY) the edit cursor cannot be stepped into that field. When the edit cursor is positioned in a parameter selection field (for example, SOURCE = on the TRIG menu), the DIGIT keys step through all possible choices for that parameter (in this example, SOURCE = TGEN, SOURCE = EXT, etc.). Lastly, when the edit cursor is positioned in the units field of a parameter value, the DIGIT keys increment or decrement the numeric value of the parameter by a factor of 10 on each press; the units change each time the display autoranges. The ROTARY CONTROL works as follows. With the cursor in any field other than a numeric value field turning the control acts in exactly the same way as pressing the DIGIT keys. With the edit cursor positioned anywhere in a parameter numeric field, turning the control will increment or decrement the value; the step size is determined by the position of the edit cursor within the numeric field. Thus for FREQ = 1.00000 MHz rotating the control will change the frequency in 1 kHz steps. The display will auto-range up or down as the frequency is changed, provided that autoranging permits the increment size to be maintained; this will in turn determine the lowest or highest setting that can be achieved by turning the control. In the 4-4 MyFlukeStore Shop for Fluke products online at: www. .com 1.888.610.7664