4.1.4 Dissipation Factor (D) Alignment
1. LOW LEVEL ZERO TRIM. Setup – Press C function button and set RANGE switch to 200nF.
Connect a low loss (D<0.0002) decade capacitor to unknown test leads. Adjustment – Set the decade
capacitor to 105nF and, with a DVM, note the voltage at J5 pin (3) or D output terminal at the rear
panel. Set the decade to 5nF and again note the voltage. If the two voltages are not equal (+/-1mV),
adjust trimmer W until switching between 105nF and 5nF procedures equal readings.
2. HIGH LEVEL ZERO TRIM. Setup – Same as step 1. Adjustment – Set decade capacitor to 100nF
and adjust trimmer U until voltage at J5 pin (3) or D output is 0V ±0.3mV.
3. D FULL SCALE TRIM. Setup – Same as step 1. Adjustment – Set the decade capacitor for a
front panel C reading of 159.2nF. Connect the 1000 ohm standard resistor in parallel with
the decade capacitor. Set trimmer T for a front panel D reading (push D button) of 1.000.
4. 200pF RANGE D TRIM. Setup – Press C function button and set RANGE switch to 200 pF.
Connect the low loss (D<0.0002) decade capacitor to unknown test leads. Adjustment - Set
the decade to 100pF (+/-20%) and adjust trimmer H for 0V +/- 0.3V at J5 pin (3), or D output.
5. 2nF RANGE D TRIM. Setup – Same as step 4, except set RANGE switch to 2nF. Adjustment –
Set decade to 1nF (+/-20%) and adjust trimmer F for 0V +/-0.3mV at J5 pin (3), or D output.
6. 20nF RANGE D TRIM. Setup – Same as step 4, except set RANGE switch to 20nF. Adjustment –
Set decade to 10nF (+/-20%) and adjust trimmer E for 0V +/-0.3mV at J5 pin (3), or D output.
7. 2µF RANGE TRIM. Setup – Same as step 4, except set RANGE switch to 2µF. Adjustment –
Set decade to 1µF (+/-20%) and adjust trimmer C for 0V +/-0.3mV at J5 pin (3), or D output.
8. 20µF RANGE D TRIM. Setup – Set RANGE switch to 20µF and connect a 10µF (+/-20%)
capacitor (D known to +/-0.001) to unknown test leads.
Adjustment – Adjust trimmer B for front panel D reading (push D button) equal to D value
of the 10µF capacitor.
9. 200µΗ RANGE D TRIM. Setup
– Press the L function switch and set the RANGE switch to
200µH. Short the Kelvin Klips together and note the zero inductance (approximately +5 counts)
for the use in the adjustment. Connect a 1.2 ohm, 5% carbon composition resistor to the test
leads.
Adjustment
– Adjust trimmer A for a display equal to, or -1 count from the zero inductance
value noted when the Kelvin Klips were shorted together.
4-3
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