Measurement - BK Precision 875B Manual De Instrucciones

(6) Set the m eter to p roper capacitance range and go to step
seven to measure capacitance.
20µF, 200µF, 2mF & 20mF (Cs): Range
Zero Adjustment (Cs Mode)
(4) Set the capacitance meter to the 2µF Capacitance range.
(5) Using a small, flat-blade screwdriver, slowly turn the "0 Adj"
control to calibrate the display for a zero re ading. Now the
meter is calibrated for these four ranges.
(6) Set the meter to p roper capacitance range a nd g o to step
seven to measure capacitance.
Capacitance & Dissipation Factor Measurements
(7) Discharge the capacitor to be measured.
(8) Insert the capacitor leads into the component test sockets at
the front of the meter. If the capacitor leads are too short, use
the alligator clip leads provided with the instrument to connect
to the capacitor. Be sure to o bserve the proper polarity if the
capacitor is a polarized type.
(9) Read the capacitance value in the d isplay. If "1---"(a one w ith
the following 3 dig its blanked) is shown (which indicates an
over-range reading), move the range switch to the next higher
capacitance. If necess ary, perform ze ro ad justment b efore

measurement.

(10) To measure the "D issipation Factor" of the capacitor, set the
mode switch to th e "D" po sition, a nd read t he d issipation
factor value in the display.
(11) ESR Fur capacitors
"Equivalent Series Resistance" is ty pically much larger than
the actual "ohmic" series resistance of the wire leads and foils
that ar e phy sically in series w ith the heart of a ca pacitor,
because ESR includes also the effect of dielectric loss. SR is
related to D by
represents "omega" =2 p i times frequency). In 20 mf range,
the d issipation fa ctor can be obtained by the formu lary D=
the formu la E SR= Rs= D/wCs (w here w
5