Metrohm 731 Relay Box - Manual (Page 15)

2.3 Setting the DC output voltage
Relay Box 731, Instructions for use 9
2.3 Setting the DC output voltage
The common output voltage for the direct current outputs (DC1 and
DC2) is set inside the Relay Box housing.
• Switch off the instrument and pull out the line plug. Loosen the
four knurled screws of the protective cover and remove them.
Right-hand side
of housing with-
out protective
cover Rear view of
housing without
protective cover
• The screws marked with an arrow in the diagram must be loos-
ened.
• Carefully remove the instrument PCB from the housing.
To set the output voltage the plug-in bridge P9 on the relay box
motherboard must be fitted with the appropriate jumper .
The location of plug-in bridge P9 can be seen in the diagram of the
instrument motherboard shown below.
+18V +10V
+24V 0V*
+5V
1 12 P9
6 7
Set the jumper, which is located in the +24 V position
as standard, to the position corresponding to the re-
quired output voltage with the help of tweezers or ta-
per-nose pliers.
+18V
+10V
+24V
0V*
+5V
1 12
P9
6 7
Carefully reinsert the motherboard in the housing and screw the in-
strument together. Use the adhesive labels provided to note the set
output voltage on the rear panel of the instrument.
Jumper