GW Instek LCR-800 Series User Manual page 26

LCR-800 Series User Manual
4-5-3. D/Q in PPM (parts per million)
If the value of D or Q is less than 0.0100, user can select DQ in PPM to improve
the resolution by a factor of 100. The units of D and Q in PPM are dimensionless
and expressed as a decimal ratio with the multiplier of 1000000. User can just
press compound key 4 to select the unit of D or Q in PPM. To disable the DQ in
PPM feature, press the same key again.
4-5-4. Test Voltage
The range of test voltage is from 5mV to 1.275V in increments of 5mV. The
actual voltage through the DUT is never more than the source voltage. The DUT
impedance and the source resistance of the LCR Meters decide the actual test
voltage. The smallest voltage through the DUT will be 20% smaller of the source
voltage in general. The programming of test voltage is as follows (Figure 4-10):
! Press MENU key.
!
Press F3 key to select "SETTING" menu.
!
Press F2 key to select "VOLT" menu.
! Input the desired value via the numeral keys.
↵ ↵ ↵ ↵
! Press key
!
After the BAR at the bottom of LCD monitor is filled fully, the "Test
Voltage" input is done.
4-5-5. Constant Voltage Source
If the DUT have to be measured at a particular test voltage, the LCR Meters
provides the constant voltage feature. After "Constant Voltage" is selected, The
LCR Meters will keep a source resistance of 25Ω. Therefore, the test voltage is
constant for any DUT impedance which large than 25Ω. If "Constant Voltage" is
selected, the measurement accuracy will cause a reduction by a factor of three.
User can just press compound key 1 to select the feature of "Constant Voltage".
To disable this feature, press the same key again.
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