Setting The Frequency - Extech Instruments PRC50 User Manual

7 Programming the Calibrator's Global Settings
Press and hold the (ZERO) key while switching the meter ON. Release the (ZERO) key 3 seconds after the LCD switches
ON. The following parameters can be programmed by the user when the meter is in this state. The top row of the LCD
display shows the parameter name and the bottom row of the LCD shows the setting. Use the (MODE) key to scroll the
parameters and then follow the instructions below to configure each parameter.
7.1 Setting Auto-power off time (AP.OFF)
Step 1: Use the (MODE) key to move to the "AP.OFF" parameter at the top of the LCD (if it's not already displayed).
Step 2: Set the time from 0-60 minutes using the second pair of 〔 〕/〔 〕keys counting right to left. Each press of the〔
〕/〔 〕key equals one 10 -minute increment or decrement. Press and hold a key to scroll quickly.
Step 3: To save the setting, press the (ON) key and the LCD will show the "SAVE" symbol.
Tip: The value (0) indicates that the automatic power-off function is disabled.
7.2 Setting Backlight time
Step 1: Use the (MODE) key to move to the "BL.OFF" parameter at the top of the LCD (if it's not already displayed).
Step 2: Set the time using the 〔 〕/〔 〕keys (the unit of measure for the time is 'seconds' and the range is 0-3600
seconds). Each pair of〔 〕/〔 〕keys corresponds to each digit of the LCD reading. Each press of the〔 〕/〔 〕key
increases or decreases the digit. Increasing the digit from 9 or decreasing it from 0 causes the digit to overflow or underflow,
allowing the output value to be set without interruption. Holding down the〔 〕/〔 〕key continuously changes the digit
quickly. The value won't change if it is increased or decreased to the Maximum or Minimum value.
Step 3: To save the setting, press the (ON) key and the LCD will show the "SAVE" symbol.
Note: When value is (0), the backlight will not switch OFF automatically.

7.3 Setting the frequency

Step 1: Use the (MODE) key to display the "FRSET" parameter at the top of the LCD (if it's not already displayed).
Step 2: Shift between 50Hz and 60Hz using the right pair of 〔 〕/〔 〕keys.
Step 3: To save the setting, press the (ON) key and the LCD will show the "SAVE" symbol.
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