The  laboratory  quality,  low  priced  decade  boxes  are  designed  for  maximum  usefulness  and  economy  in  laboratory  measurements  testing  and  development  work. 

Their accuracy is adequate for all but the most exacting applications and their small size and  clear readent should  be particularly useful in experimental set–ups using small modern  components. 

DESCRIPTION :

High quality, high stability metal film Resistances are used in these decades. The Model–503  decades are precision and handy units, which gives known resistance values. The instrument is  designed  to work in DC- full Audio Frequency range and low Radio frequencies having seven independent decades. 

The resistance elements have no electrical connection to panel. Each decade have 10  resistances  in  series.  All  the  decades  have  silver  alloy  contacts  to  ensure  low  contract  resistance  and  long  life.  Fresh  dial  is  shielded  electronically. 

FEATURES :

• Accuracy : ± 0.5%.
• Low Contact Resistance.
• Good Frequency Characteristics.
• Excellent Stability.
• Very Low Zero Capacity.
• High Stability Metal Film Resistance are used.
• Weight : 1.5 Kg. Approximately. 
• Dimension : 130mm × 455mm × 105mm 

SPECIFICATIONS : 

Accuracy “Long Term”  :

Long  term  2  years  warranty  applies  to  the  tolerances  given  barring  damage  by excessive  current.  Tolerances  apply  at  low  current  and  at  d.,c.  ‘or’  low  Radio  Frequency. 

Zero  Resistance  :     Approx.  3  Milli ohms  per  dial. 

Max. Current  at  70⁰C.

1. Max.  of  3 mA  in   1 M ohms   Decades.
2. Max.  of  5 mA  in   100 K ohms  Decades.
3. Max.  of  10 mA  in   10 K ohms  Decades.
4. Max.  of  30 mA  in   1 K ohms  Decades.
5. Max.  of  100 mA  in   100  ohms  Decades.
6. Max.  of  300 mA  in   10  ohms  Decades.
7. Max.  of  500 mA  in   1  ohms  Decades. 

Total  Measuring  Range  of  Resistance  =   11.11111  Meg  ohms. 

Seven  Decades  as  follows  :

1. 10  x  1 ohms.            =          10,  ohm.
2. 10  x  10 ohm.            =          100,  ohm.
3. 10  x  100 ohm.          =          1 K, ohm.
4. 10  x  1 K ohm.           =          10 K,  ohm.
5. 10  x  10 K ohm.         =          100 K,  ohm.
6. 10  x  100 K ohm.       =          1  M,  ohm.
7. 10  x  1 M ohm.          =          10  M,  ohm. 

Accuracy : Better than  ± 0.5%  or  ±  0.05  ohms  which  ever  is  greater. 

Note: There may be any change in specification due to continuous R & D without notice.

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