Marconi Instruments TF 2700 - 2.6 RESISTANCE MEASUREMENTS

,...0
, --- - ,
I I
1-
Il..
"""
I
I
I
I
:
I
I .-
' ~
"'H
Fig. 2. Il U se of D. C. Choke Adaptor
2.6 RESISTANCE MEASUREMENTS
Resistance may be measured at 1 kc/ s from the internaI oscillator,
at frequencies of 20 c/s to 20 kc/s from an external source, or at d.c. from
the internaI battery or an external d. c. supply. Fig. 2.12 shows the basic
bridge configuration for measurements with (a) a. c. and (b) d. c. For
resistance measurements the LOSS BALANCE arm is replaced by a 100 (2
resistor, andfor d.c. measurements the meter only is .used as the detector.
D£TECTIM
I. I. l.
~~ !IT!-
I_M +T D.c.S_T
IV 'Wt
J-1"
"...
(a) A.c. (b) D.C.
Fig. 2.12 Basic Resistance Bridges
20