AEMC 5600 Repair And Calibration Manual

MODEL 5600 REPAIR & CALIBRATION MANUAL CAT# 1431.01
12
REVISION 7: June 11, 1999
FILE LOCATION: E.F. Disk - Manuals - Cal. Man. - Model 5600.DOC
10/27/99
Reference
Vref=R. I .
Vm = Rx. I .
Rx
Shunt
Reference
Measure
I
V;90 : x 1000 pts
Vm
Vref
27
R8
VR8
R13
Z1
R14
R6
Rx
R12
R9
R10
Q1
S
D
G
+

R11
Vref
VR8
26
i
+P
e) MEASUREMENT : Measurement Block Diagram
Vref creation
A FET (Q1) is used to regulate reference.
Example: with range 200
Ω
and measurement = 200
Ω
.
I = 6V = 10 mA; i.e. VR6 = 100 mV
600
Ω
Input – of Z1 is on point (26) potential.
Z1 regulates in order to get e+ = e- (if Vs changes then VGS of Q1 changes, RdS
also changes as well as for current in section R8-R11).
So, if e+ = e-, this means that potential on point (27) is the same as potential on
point (26), that is to say that:
VR6 = VR8 = 100mV.
In fact R11 = R8 and iR11 = iR8 so VR11 = VR8 + 100mV = Ref.
(for VBAT + 6V)
VR6

AEMC 5600 Specifications

General

Brand	AEMC
Model	5600
Category	Measuring Instruments
Language	English