Vaisala HMP240 - Manual (Page 63)

HMP240 series
M210300en User's Guide
61
the external load. The output current can, however, be measured at test points
CH1+/CH1- and CH2+/CH2- without disconnecting the output wires. These
test points can therefore be used in one point offset correction against an accu-
rate reference or in checking the current output without disconnecting the
analogue output from the process.
X2
OPENED COVER OF THE HMP 243
X15
CH2
CH1 +
+
C
H
1
+
C
H
1
-
C
H
2
+
C
H
2
-
Figure 7.5 Location of the CH1 and CH2 test points
CH1+ CH1-
TEST POINTS
CH1+
CH1-
mA
R
L
X2
Figure 7.6 Circuit diagram of the analogue output current test points
7.7 Adjusting the contrast of the display
The contrast of the display can be adjusted using the trimmer "LCD display
contrast" located next to press switches.