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Trip Amplifier 2/209
Hardware description
3.5
Functional test
3.5.1
General
The device will be calibrated ex works following the specifications given with orders. The
EN
unit is operational and approximately 0.2 % accurate as soon as the power is turned on.
It has to be noted however that best performance is only achieved once temperature
balance is reached between the device and its ambient conditions. A device taken from
stock inserted in a warm rack may therefore take 1 ... 2 hours before it reaches its full
accuracy given that the ambient temperature is stable and within the boundaries
mentioned in the section "Technical data".
Factory calibration is carried out at 20 °C ... 25 °C after a 72 hour soak test. Due to the
excellent long term stability of the device no regular maintenance is needed. An annual
check of zero and span is regarded as being sufficient. The PCB carries a row of
jumpers:
Standard setting for row of jumpers X2, X5:
X2
X5
•
•
•
MODE jumper 4–5 is required for testing. The unit goes offline.
MODE jumper 3–6 for normal operation.
14
1 2
4
3
2
1
5
6
7
8
MODE: X5
–
jumper 4–5
programming mode (program execution stops)
–
jumper 3–6
run mode (device cannot be programmed)
KEY: X5
–
jumper 2–7
disable front push button changes
–
jumper 1–8
enable front push button changes
TEST: X2
–
jumper 1–2
if this jumper is set during the programming mode X5 4–5 testing is enabled.
Device calibration is only possible in this mode of operation.
PROGRAM
RUN
KEY LOCK
KEY UNLOCK
TEST
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