HP 4262A Operating And Service Manual page 40

Section III Model 4262A
Figure 3-6
7. Rotate L ZERO ADJ control until inductance readout is 000 counts on LCR DISPLAY.
Note
To achieve more critical zero adjustments,
when 10kHz test signal frequency is used, per¬
form the capacitance and inductance zero off¬
set adjustments (steps 4, 5, 6 and 7) at 10kHz,
8. Remove shorting lead from 16061A.
9. Select desired FUNCTION, either L, C or R/ESR.
10. Connect sample to be measured (L, C or R) to Test Fixture.
11. Model 4262A will automatically display value of unknown.
Note
If O-F, U-CL, minus (-) or blank display occurs,
see Table 3-3 for solution. Measured values for
semiconductor devices are sometimes unreliable
when TEST SIGNAL LOW LEVEL pushbutton
is in its normal (IV) state (button lamp is not
lit). In these instances, follow Figure 3-8 for
semiconductor device measurement.
Note
If manual triggering is required, press HOLD/
MANUAL button. Each time tire button is
pressed, the instrument is triggered.
12. If internal DC bias is required, set DC BIAS switch to 1.5V, 2.2V or 6V: If not, OFF
position should be selected.
Note
DC bias application may only be used for cap a™
citance measurements.
CAUTION
POSITIVE POLE OF ELECTROLYTIC CAPA¬
CITOR MUST BE CONNECTED TO HIGH
TERMINALS AS PLUS BIAS VOLTAGE IS
APPLIED TO HIGH TERMINALS WITH RE¬
SPECT TO LOW TERMINALS.
Note
An external bias voltage up to +40V may be
applied to EXT DC BIAS rear panel connector.
Connect DC power supply to EXT DC BIAS
connector. Set DC BIAS switch to EXT.
3-X 6