8
ME 30
1 Measuring Amplifiers on Eurocards ME30
The Eurocards ME30 is a 600 Hz carrier frequency amplifiers for strain gauge
transducers. An aluminium front panel (4 divs. wide) is delivered as standard.
Aplasticcs handle can be mounted instead of it if ordered separately.
All plug-in cards are delivered without housing without power supply unit so
that a 19” rack frame can be set up as required. Owing to the narrow width of
the plug-in cards (4 divs = 20.32mm) up to 21 cards can be inserted into a 19”
rack. The dimensions and connecting details correspond to the IEC standards
48D and 297.
All controls are accessible from the front.
Individual adjustments are described in chapter four; ex-works settings are
specified on the back of the Eurocard.
Notes for the diagram on the
right
S21:
calibration – measuring – zero
S22/23:
zero balancing (coarse)
S24/1+2:
MR1 fine balancing
internal/external
S24/3:
switch for measuring frequency
range 60Hz to 2Hz
S24/4:
MR changeover from MR1 to
MR2
S25:
switching the bridge excitation
voltage
S26/27:
setting of measuring range
(coarse)
P21/22:
fine balancing of MR
P23:
zero balancing (fine)
Cal. +1mV/V
zero
MR1
fine balancing
external
5kΩ
50kΩ
zero balancing
external
zero
calibr.
MR1–2
wh
gy
bk
bu
gn
14.5...15.5V <50mA
14.5...15.5V <50mA
–
+ 9V...+35V
(opt. DC/DC converter)
U
B
+14.5...+15.5V
U
B
–14.5...–15.5V
U
a
10V >5kOhm
option I
a
20mA
2.33V
ss
synchr.-voltage
or synchr. input
+
–
Fig. 1.1: Block diagram
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