Advanced Functions - Extech Instruments 422123 User Manual

Advanced Functions

Programming an Output in Percent (Current and Voltage Outputs Only)
Output values can also be programmed in percent. For example, a 4 to 20mA output can
be programmed as follows: 0% = 4mA, 50% = 12mA, and 100% = 20mA. The main LCD
digits will reflect the actual output while the top (smaller) digits will display the percentage.
Follow these steps to output a signal in percent:
1. Setup a test as described earlier for a current or voltage output.
2. Press the SHIFT button so that the word SHIFT appears on the LCD.
3. Press the % key.
4. Enter a percentage from 0 to 100% (1% resolution) using the numeric keys.
5. Press the ENTER key.
6. The current or voltage signal will be output from the meter.
7. 0% corresponds to the lowest value in the range ('4mA' for 4 to 20mA, '0mV' for 0 to
100mV, for example.) while 100% corresponds to the highest value in the output range
('20mA' for 4 to 20mA range, '100mV' for 0 to 100mV range). All percentages in
between will be linear to the voltage or current ranges.
8. Refer to the list below for the 1% step value for each range:
Step Mode (Current and Voltage Outputs Only)
This feature allows the user to step up and down through the output range in programmed
steps as follows:
1. Setup a test as described earlier for a current or voltage output.
2. Press the SHIFT key and then the % key.
3. Enter a percentage (1 to 100%) using the numeric keys. This percentage will represent
the size of each step. Press the ENTER key when complete.
4. Now each time the '8 %
percentage programmed (in the previous step). Press the '0 %
output down by the percentage programmed.
5. For example, for a 4 to 20mA output type and a step percentage of 25%, the following
steps are possible:
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4 to 20mA: 1% = 0.16mA
0 to 20mA: 1% = 0.2mA
0 to 24mA: 1% = 0.24mA
0 to 100mV: 1% = 1mV
0 to 1V: 1% = 0.01V
0 to 12V: 1% = 0.12V
' key is pressed, the output signal will be increased by the
0% = 4mA
25% = 8mA
50% = 12mA
75% = 16mA
100% = 20mA
5
' key to step the
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