As an example, assume that the 10 ohm calibration resistor measures 9.995 ohms using an ACCURATE ohmmeter. To enter this value, select EDIT for the 10.0000 ohms resistor. The cursor will appear below the first digit – under the number ‘1’. Press the key under change until this value goes to a blank position. Press the key under NEXT. The cursor will now be under the second digit – the number ‘0’. Press the CHANGE key until the number ‘9’ is in this position. Press the NEXT key and the cursor will move to the digit to the right of the decimal point. Press CHANGE until the ‘9’ appears in this position. Press the NEXT key and the cursor will move to the right under the next digit – the number ‘0’. Press the CHANGE key until the number ‘9’ is displayed. Repeat these steps until 9.995 ohms is displayed.
To save this value, press the key under OK. This value will be stored and the display will step to the next calibration resistor. When you have entered all of the values you want to change, press the NEXT key until SAVE PARAMETERS is displayed. Press the key under SAVE (n/Vs/M). Continue to the next step.
á Press the key under CAL (n/Vs/M). The instrument will display STP1: OPEN CAL on the first line with a left arrow arrow, right arrow, and OK displayed on the second line. Short the HD and HS clips together and short the LD and LS clips together. Position the two pair of clips the same distance apart as they will be when connected to the precision calibration resistors. It is recommended that the test cable not be moved during the entire calibration process. Do not allow the two sets of clips to short together. This step calibrates the LCR meter for an OPEN state. Press the key under OK (Freq). The calibration routine will calibrate the OPEN state for each of the 10 test frequencies. There will be a progress indicator bar displayed on the second line of the display. As each frequency is successfully calibrated, the instrument will step to the next frequency. If the calibration process fails at any frequency, the progress bar will stop and !FAIL! will be displayed on the second line. There will also be an audible alert – long tone. The calibration process will stop and the instrument will return to the starting screen for the failed step. Upon successful calibration of the OPEN state the instrument will proceed to step 2.
á The display will show STP2: SHORT CAL. Remove the short between the HD and HS clips. Remove the short between the LD and LS clips. Using a short piece of wire, short all 4 clips together with the separation between the HS and LS clips the same distance as they will be when connected across one of the precision calibration resistors. The HD and LD clips should be placed to the outside of the HS and LS clips. This step calibrates the instrument for a SHORTED state. Press the key under OK (Freq). The calibration process will again step through each of the 10 test frequencies. The process is identical to the OPEN calibration procedure above.
á Upon successful completion of the SHORT calibration, the instrument will continue to step 3.
á The instrument will display STP3: 100 ohm CAL. Pay particular attention to the value displayed here. This is 100 ohms. The 100 ohm level must be calibrated before the 10 ohm process. This is NOT an error. Remove the short from the 4 test clips. Connect the HS clip to one side of the 100 ohm resistor, close to the resistor body. Connect the LS clip to the other side, close to the resistor body. Connect the HD clip to the same lead as the HS clip and connect the LD clip to the opposite side with the LS clip. Press the key under OK to begin the calibration process. The calibration routine will calibrate the instrument at all ten test frequencies. The calibration process is the same as above. Successful completion of the 100 ohm calibration will move the routine to step 4.
á The instrument will display STP4: 10 ohm CAL. Connect the 10 ohm calibration resistor to the 4 test clips in the same manner as in the 100 ohm calibration step. Press the key under OK. The calibration routine will begin with the same process as in the previous steps.
á As each calibration step is completed, the routine will move to the next step. Step 5 requires the 1K calibration resistor, Step 6 requires the 10K calibration resistor, Step 7 requires the 100K resistor, and Step 8 requires the 1M resistor.
á Upon successful calibration of all 6 values, the instrument will then allow you to save the calibration values. The display will show STP8: SAVE. Press the key under OK. The instrument will display PASSED and change to the measurement mode.
á A failure to calibrate at any level, other than OPEN and SHORT, may require that the default resistor values be modified. The calibration routine compares the value entered against the measured value of the calibration resistor. If the measured value falls outside the program tolerance, the calibration will fail. In this case, ad