Model SR715 Model SR720 LCR Meters

CALIBRATIONAmplitude Limits Tablecalbyte nominal voltage limits0-4 0.100 0.098 - 0.1025-9 0.150 0.147 - 0.15310-14 0.200 0.196 - 0.20415-19 0.250 0.245 - 0.25520-24 0.300 0.294 - 0.30625-29 0.350 0.343 - 0.35730-34 0.400 0.392 - 0.40835-39 0.450 0.441 - 0.45940-44 0.500 0.490 - 0.51045-49 0.550 0.539 - 0.56150-54 0.600 0.588 - 0.61255-59 0.650 0.637 - 0.66360-64 0.700 0.686 - 0.71465-69 0.750 0.735 - 0.76570-74 0.800 0.784 - 0.81675-79 0.850 0.833 - 0.86780-84 0.900 0.882 - 0.91885-89 0.950 0.931 - 0.96990-94 1.000 0.980 - 1.020For each amplitude, the calbytes are in order of ascending frequency 100 Hz, 120 Hz, 1 kHz, 10 kHz and100 kHz. For the SR715 simply skip over the 100 kHz calbytes.2. Frequency CalibrationThis procedure measures the value of the SR715/720 clock. The exact clock frequency is used incalculating capacitance and inductance values. The clock correction factor is stored in parts per million(ppm).1) Set the SR715/720 to its default conditions ([Recall] [0] [ENTER]). Set the unit to constant voltagemode, 1 kHz and remove any part from the fixture.2) Install the SR728 BNC adapter to the fixture. Connect the Ih lead to the frequency counter.3) Determine the new calbyte by the formula:Calbyte = (frequency - 1000.000) x10004) To adjust the clock calbyte, press the [Calibrate] key until "Std cAL" appears on the display. Press[ENTER] once to get into this menu structure, and then press [Calibrate] until the message "df"appears on the left display and the current value on the right display. Enter the new value, in ppm's,using the entry keys. To exit the standard cal menu, press [Calibrate] until the "quit cAL" messageappears and then press [ENTER].5-13