

DECADE RESISTANCE BOX CRD and R1000 
Resistance boxes with switches for laboratory.

Accuracy: 1% both on ac and dc
Resistances of metallic layer with low temperature coefficent and high stability.
Switches with resistance of contact < 0,005W
Two input safety sockets plus earth connector
Power: 0,5W per resistance; For short period: 1W
Insulation voltage: 2000V
Realised on metallic box, ovenbacked, internal connections made according to EEC rules.

CRD4  4 Decade resistance boxes
 Available models:
Model 
Decade steps in ohm 
Total ohm 
CRD 142 R 
10 x (100+10+1+0,1) 
1.111 
CRD 143 R 
10 x (1k+100+10+1) 
11.110 
CRD 144 R 
10 x (10k+1k+100+10) 
111.100 
CRD 145 R 
10 x (100k+10k+1k+100) 
1.111.000 
CRD 146 R 
10 x (1M+100k+10k+1k) 
11.110.000 
CRD5  5 Decade resistance boxes
 Available models:
Model 
Decade steps in ohm 
Total ohm 
CRD 153 
10x(1K+100+10+1+0,1) 
11.111 
CRD 154 
10x(10K+1K+100+10+1) 
111.110 
CRD 155 
10x(100K+10K+1K+100+10) 
1.111.100 
CRD 156 
10x(1M+100K+10K+1K+100) 
11.111.000 
CRD6  6 Decade resistance boxes
Available models:
Model 
Decade steps in ohm 
Total ohm 
CRD 163 
10x(10K+1K+100+10+1+0,1) 
111.111 
CRD 164 
10x(100K+10K+1K+100+10+1) 
1.111.110 
CRD 165 
10x(1M+100K+10K+1K+100+10) 
11.111.100 
CRD 166 
10x(10M+1M+100K+10K+1K+100) 
111.111.000 
Description
The R1000 consists of 7 resistor network which can be set by selector switches to the required value from 1 ohm to 9.999.999 ohm in steps of 1 ohm.
Resistors accuracy is +/ 1%.
Sockets provide access to every basic resistor network.
Switches enable series connection of basic resistor networks into one single value.
Series connection is interrupted in position "open" to enable one or a few networks to be used.

Technical data
Resistance range
subranges
 9X1
 9X10
 9X100
 9X1k
 9X10k
 9X100k
 9X1M Frequency range  to 9 k ohm toa 9 M ohm
Accuracy  X 1ohm and X 10 ohm  X 100 ohm and for 1M ohm

0...99.99.999 ohm
0...9 ohm 0...90 ohm 0...900 ohm 0...9 k ohm 0...90 k ohm 0...900 k ohm 0...9 M ohm
to 10 M ohm to 10 k ohm
+ 0  2% and + 0  0.08 ohm + 0  1%

Admitted load Switch overcurrent Admitted voltage
Admitted voltage between decades and housing Dimensions Weight

1W max 0.1 A max 100 V max
500 V max. 270 X 80 X 172mm 1.2 Kg



INDUCTANCE DECADE  L3000 
Description
The L3000 consist of three decades made up of coils wound in ferrite pots and mounted on printed circuit boards.
Inductance on output terminals is set from 0 mH to 999 mH in steps of 1mH by three switches. Values are readoff directly from the front panel.
Inductance deviation from rated value is within limits of + 0  5% at In/2.
(In is the rated current loading given in the table for individual decade steps for which the declared inductance increases for 2%)
Permitted continous current loading to 100mA corresponds to most requirements occurring in every practice.

Technical data
Inductance range
Three decades
X 100 mH
X 1.000 mH
X 10.000 mH
Accuracy in temp range from 15°C a 40°C a In/2
 0...999 mH
0...9 mH
0...90 mH
0...900 mH
+ o  5%

Inductance deviation (ðL/L) due to current variation from In/2 to In
Capacitance between coils and housing
Test voltage against housing
Continous current load Dimensions Weight

2% 50 pF 1.5 kV max. 100 mA 205 X 85 X 175mm 1.15 Kg

Description
The C2000 consist of three decades made of highquality tropicalised styroflex capacitors with accuracy 1%.
Capacitance values on output terminals ca be set from 100pF to 100.000pF in steps of 100pF with three selector switches.
Switches and capacitors are protected by a special internal housing connected to a common terminal of all capacitors (central terminal) and fastened to the outer housing over insulation plates.
Capacitance between both housing is 100pF +/ 2% and is not added to the decade capacitance except when the upper terminal is connected to the external housing.
The extremely high d.c. insulation resistance of the C2000 allows the device to be used in d.c. circuits.
Permitted operating voltage corresponds to most requirements occuring in everyday practice.
To discharge the capacitor a pushbutton is used to connect the capacitor to earth via a 100kohm resistor.

Technical data
Capacitance range
Three decades
X 100 pF
X 1.000 pF
X 10.000 pF
Accuracy

100...100.000pF
100...1.000 pF
1.000...9.000 pF
10.000...90.000 pF
+ 0  2%

Loss angle (tgð)
X 100 pF
X 1.000 pF
X 10.000 pF

max. 0.0005 a100 kHz
max. 0.0004 a10 kHz
max. 0.0004 a1 kHz

Max frequency
X 100 pF
X 1000 pF
X 10000 pF

9 MHz
2 MHz
500 KHz

Max operating volotage
Test voltage against external housing
Capacitance between both housing
Insulating resistance
Capacitor discharging
Dimensions
Weight

400 V dc  250 V ac
1.5kV ac
100 pF + o  2%
min. 10000 m ohm
with pushbutton Discharge on 100 k resistor
205 X 85 X 175 mm
1.35 Kg.

Copyright © 1995, italtec srl.


