B&K 4070A - Manual (Page 17)

BK Precision 4070A User Manual Rev.2.2
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4.5 Changing values
For each operating mode, the LCD display shows a number of fields that hold operating parameters for the
selected mode (i.e. sweep start frequency, stop frequency, etc.).
To change the value of a parameter, you must first move the cursor to the desired field on the display. To do this,
press one of the Field Arrow keys until the cursor appears in the desired field. When the cursor is advanced to a
new field, it is placed in the rightmost position within that field and is indicated by a flashing character.
One of the valid cursor fields is "off". When the cursor is off, numeric values cannot be altered until the cursor is
switched back on. This feature is designed as a "lockout" function to safeguard parameter values from being
changed by inadvertent key presses or turns of the rotary knob.
Once the cursor has been moved to the desired field, the field value can be changed in two ways. You can modify
a current value or you can enter a new value.
4.5.1 Modifying an existing value
To modify an existing value, first move the cursor to the desired field using the Field Arrow keys. Then use the
è and ç keys to position the cursor over the digit you wish to change. Press the é or ê key to increment or
decrement that digit. Alternatively, you can turn the rotary knob clockwise or counterclockwise to adjust the digit's
value. Attempting to set a parameter to a value outside the allowable range will cause the 4070A to beep and set the
parameter to its maximum or minimum permissible value.
Non-numeric values toggle between preset values. (An example is Linear or Log type sweep). You can toggle
these values by pressing an arrow key or turning the wheel. You can also press the 0 key to select the first value or
the 1 key to select the second value.
4.5.2 Entering a new value
To enter a new value, first move the cursor to the desired field using the Field Arrow keys. Use the keyboard to
type in new value. If you make a mistake while typing in a value, use the following three keys to correct mistakes:
Use ç as a "backspace" key to erase the last digit you typed.
Use clear to erase all characters from the field value and start over.
Use a Field Arrow keys to abandon the editing process, restore the old value, and move the cursor to the next
field.
Once all numbers are entered, select which units apply to the newly entered digits:
To enter a frequency, use the MHz, KHz, or Hz keys.
To enter a peak-to-peak voltage, use the Vp-p or mVp-p keys.
To enter a dBm value, use the dBm key.
To enter a value in Volts, use the Vp-p or mVp-p keys. (Ignore the p-p designation).
To enter a time value, use the Sec or mS keys.
Some units have dimensions not listed on these three keys. AM mode has a value in percentage, for example. In
this case, any of the three units keys will work. To type in a new percentage value, for example, type the percentage
digits and then press the MHz/dBm key or the KHz/Vp-p/Sec key or the Hz/mVp-p/mS key (all are equivalent).
The 4070A will confirm that a new value has been successfully entered by double beep. If a value is entered that
is outside the allowable range, the 4070A will beep and set the parameter to its maximum or minimum permissible
value. An easy way to determine a maximum allowed value is to enter a very large value (i.e. 999 MHz or Volts,
etc.) and observe the value that the 4070A returns.