Extech Instruments UM200-NIST User Manual page 8

Alarm Function
Press the button to enable the alarm function after the HI and LOW limits are set. The
symbol will be displayed in the LCD.
If the resistance measured falls within the range of HI and LO limits, a symbol of PASS is shown
in the LCD. If not, the buzzer will beep to indicate a fail.
If the reading is OL, the alarm function is temporarily disabled until a reading is obtained.
Alarm HI, LO, or Resistance per unit Setup
1. Turn the rotary switch to SETUP.
2. Press the SELECT button to select HI limit, LO limit or Resistance per unit
3. Press the ZERO / RECALL button to step through existing limits (20 available) or to set a new
limit.
4. Press the SELECT button to select a displayed limit
To set a new limit, press the ▲ or ▼ button to increment or decrement the displayed value. To
5.
increment or decrement value faster, press and hold the ▲ or ▼ button for over 2 seconds.
6. Press the RANGE x10 button to move the decimal to the next position.
7. To store the modified data, the SELECT button.
NOTE: If the reading of resistance is "OL", the unit will not indicate PASS or beep.
The alarm function works only when the resistance is within measuring range.
NOTE: The limits of HI and LO alarms are 0.001mΩ and 999.99Ω
The limits of Resistance per unit are 0.001μΩ/ft (or m), 999.99Ω/m, 304.79Ω/ft
Cable Length Measurement
1. Prepare a 1-foot or a 1-meter-long sample from the cable to be measured.
2. Select the proper range of resistance and Zero the range before making measurements.
Connect the Kelvin leads together and press the START / STOP button and then press the
ZERO button. The reading should be zero Ohms.
3. Connect the test leads to the sample of cable at the 1 foot or 1 meter length.
Press the Ω/LENGTH button for over 2 seconds. The meter will beep and the LCD will display
4.
units of FT or m. The measured value is stored and used to determine cable length.
5. If needed, press the FEET/METERS button to change the units. If the units are changed, press
the Ω/LENGTH button for over 2 seconds again.
6. Disconnect the sample cable and connect the Kelvin clips to the cable to be measured. The
LCD will display the length of the cable.
If "OL" appears in the display, select a higher range and press START.
7.
8 UM200-en-GB_V1.6 10/19