Heathkit IB 2 Schematic

Page 1

HEATHKIT IMPEDANCE BRIDGE

MODEL lB-2

SPECIFICATIONS
CirCuit. . . . . . . . .. ............ 4-arm impedance bridge
DC Measurements ...... . . . . . Built-in power supply operating directly from 110 V AC. Panel
binding posts provide for use of external supply.
Meter ..................... . .100-0-100 microampere meter
AC Measurements .......... . Built-in 1000 cycle vacuum tube oscillator. Terminals on panel

provide for connecting an external generator for measurement at
other frequencies.

Detector ..................... V acuum tube detector and rectifier make use of built-in meter .
Panel binding posts provide for connection to external detectOr.

Resistance .......... . ...... . 0.1 $2 to 10 megohm

Capacitance ............ ..... 10 unf to 100 ufd

Inductance ................ . . .10 uh to 100 h

Dissipation Factor (D). . . . . . . .0002 to 1

Storage Factor (Q). . . . . ...... 0.1 to 1000

Accuracy .......... . ....... . .1/2 or 1% decade resistors used. 1/2 of 1% silver mica conden-

sers used. Accuracy is limited more by interpretation of scales
and workmanship of assembly. The following is normal:
Resistance i3%

Capacitance 323%

Inductance i10%

Dissipation FactOr (DszR) i20%

Storage Factor (Q=wL/R) 120%

Accuracy will fall off at extreme outer limits.

Power Requirements ........ . 105-125 volts, 50/60 cycles, 10 watts
Tube Complement ....... .....2 - 1U4 and 2 - 1L4

Power Supply. . . . . ......... . . Power Transformer and Selenium Rectifier
Cabinet Size ..... . ........... 8 high x 17 Wide -x 6 deep

Shipping Weight. . . . . . . . . ..... 15 lbs.

Page 2

A
r x.
o \ mm
60 INDEX 1' {
FUNCTION SWITCH \
SHOWN IN POSITION IIl - - .. -
(C-DI
30° INDEX
RANGE swrrcn r r
\. \.
SHOWN IN posmon n
r/ f
(100 uh - 0.1 9 - m m) x H
DO
COIIML
SECJ
30° INDEX
DETECTOR swnca
BRIDGE
mama. snow»: m posmou #2
(DC-SHUNT) l
0
30 INDEX cu comm
GENERATOR swncn .200
, , 4,
snow»: m posmon Ill
(DC-INT.) -'----
L -
_ _________________ ._-______-_________ _-,..--...._-"_---.' I -'
1 I00 : I . :
.uur ' I 7 I
| :22 | I : ~
' l : mow
l ' I
' I
t 005 : I L! 33 l
l .
I mar m I : :mo mus:
' I I ' RECIIFIER 0 1 CMIIOL
I mar. | a
. ma : : m _ K :
I 470K 470K _____ I g . .
I I : I
I :r r r r} ' I
r ' l
I I \. \. \ + moo I :
I I fi 9:45?» :_L.. : g
| I I I
I l I l
i .. : i 2 l;- 1 . I
' r ~. 1 ~
L___________£_"EE_"§_"1'1 _______ , _______________ ' ______ : x a <1 ___~_-___- ____________ ; -__:
DETECTOII UIIIT
BLACK
Ios-Izov. ac :17- r .4
50- 60 CYCLES K K .

/ BLACK

LINE SWITCII ON REAR '
OF GEN. LEVEL CONTROL

no ' IMPEDANCE BRIDGE SCHEMATIC

.. 5.35 v
UMP

, RED unmet
RECTIFIER 4! 3,