background image

NOTE 

pF 

pico  Farad 

(10-12 

Farads) 

nF 

nano  Farad 

(10-9 

Farads) 

I'F 

micro  Farad 

(10-° 

Farads) 

mF 

milli  Farad 

(10-' 

Farads) 

Accuracy  is  based  on  an  operating  temperature  of  23°C  (73°F)  at  relative 
humidity  up  to  75%. 

Test Voltage: 

>3.5 volts  peak  maximum,  "+"  input terminal voltage is 

always  higher  than" -"  input  terminal. 

Overload  Protection: 

The  meter  is  protected  against  damage  from 

charged  capacitors  (greater  than  50  VDC)  by  a  100  mA/250  V,  fast  blow 

fuse. 

Zero  Capacitance  Adjustment  Range: 

Approx.  ±20 pF. 

Th'ese specifications are  subject  to  change  at  any  time  and  no  obligation  is 
assumed  as  to  future  manufacture of  the  product  herein  described  nor 

adherence  to  this data  in case  of  such  future  manufacture. 

Meter  Safety 

1.  Observe  polarity  when  connecting  polarized  capacitors. 

2.  Fully  discharge  any  capacitor. 

3.  Never  apply  voltage  to  the  test  connectors,  serious  damage  may  result. 

4.  Do  not  short  the  test  leads  together.  This  will  cause  a  large  power 

drain  on  the  battery  and  will  show  an  overrange  on  all  r'3nges. 

Capacitance  Measurement 

1.  Insert  any  test  leads  or fixtures and  rotate range  selector  to  a  range on 

the capacitance  scale  higher  than the expected  capacitance  to be 
measured. 

2.  If  the  200 pF,  2000 pF  or  20  nF  range  has  been  selected  and  the 

display does  not  read  zero,  use  the  zero adjust  knob  to  bring  the 
reading  to zero.  The  adjustment  is  limited  to  approximately  ±20  pF. 

3.  Connect  the  alligator  clips  to the  capacitor  leads  or  insert  capacitor 

leads  into  the capacitor  test  sockets. 

4.  Read  the  display  value  on  the  LCD.  If  display  shows  "1",  it  indicates 

an  overrange  measurement.  If  the  display  indicates  one  or  more 
leading  zero's,  shift  to  the  next  lower  range  scale  to  improve  the 
resolution  of  the  measurement. 

Measurement  Considerations 

1.  If  the  capacitance  value  is  unknown,  start  with  the  200 pF  range  and 

rotate  selector  switch  to successive  higher  ranges until  the  overrange 

indication disappears and a 

is  obtained. 

www 

. ElectricalPartManuals 

. com

Summary of Contents for CX-920A

Page 1: ...ER o o o i 2OI F 2iJF 200nF ZOOI F 10 2ilnF 200J 200J iJF pF 200 pF OFF I OFF TO CONVERT nF TO IF MOVE DeCIMAL LEFT 3 PLACES mF TO F Move DECIMAL RIGHT 3 PLACES CX 920A Lc J c J DISCHARGE CAPACITOR BEFORE CONNECTING w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 2: ...3112 Digit LCD 0 55 H Zero Adjustment 2IXM 2lXIJ F 20 mf TO CONVERT nF TO IIF MOVE DECIMAL LEFT 3 PLACES mF TO IF MOVE DECIMAL RIGHT J PLACES CX 920A S t I l Lt DISCHARGE CAPACITOR BEFORE CONNECTING 1 w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 3: ...e CX 920A a truly portable in strument Model CX 920A Specifications General Display 3 Y digit LCD 0 55 H with polarity Overrange Indication A 1 with the 3 least significant digits blanked Operating Environment O C to 50 C below 70 relative humidity Storage Environment 20 C to 6O C battery removed and below 80 relative humidity Temperature Coefficient 0 1 x specified accuracy per C which is only ap...

Page 4: ...ds together This will cause a large power drain on the battery and will show an overrange on all r 3nges Capacitance Measurement 1 Insert any test leads or fixtures and rotate range selector to a range on the capacitance scale higher than the expected capacitance to be measured 2 If the 200 pF 2000 pF or 20 nF range has been selected and the display does not read zero use the zero adjust knob to b...

Page 5: ...apacitance Test Method To test a large unknown capacitance of more than 20 000 I F use the following procedure 1 Select a capacitor with a known value over 10 000 I F and as close to 20 000 I F as possible this value becomes Ck 2 Place the unknown capacitor Cx in series with the known value capacitor see Figure 1 3 Measure the capacitance of this series combination The measured value becomes Cs 4 ...

Page 6: ...CE MENT DISCONNECT TEST LEADS FROM ANY ENERGIZED CIRCUITS TO AVOID SHOCK HAZARD 1 Remove the two 2 screws in the rear cover of the case and lift the back off from the front section 2 Replace battery with a 9 V battery and be sure to observe polarity 3 Carefully replace the rear cover and replace the two 2 screws Fuse Replacement 1 Remove the two 2 screws in the rear cover of the case and lift the ...

Page 7: ...CX 920A Schematic Diagram 11 I ii i I I 88 i 0000SO000000 6 1 il Ii I l w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 8: ... lilt o 0 0 0 ROJ RI 0 0 12 COJ fmO It D D D O IJ 0 4233 51760 0 o u 000 O UO I 001 iHO O tJO OOOOO RO D OJO Q2D 0 Oll 0 c J 0 DeoD 0 D l lIOD 02100 002 002 00 tJ J 0 co r i Ueo D L I n W co lA 250Y 00 C01 D 004 005 7 v w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 9: ... defect in material or workmanship NTE Electronic Inc s liability is limited in its sole discretion to the repair or replacement of the UNIT with a new or reconditioned model of equiva lent quality In the event of replacement with a new or reconditioned model the replacement will continue the warranty period of the original UNIT IN NO EVENT WILL NET ELECTRONIC INC OR ITS AGENTS BE LIABLE FOR ANY I...

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