Kipp&Zonen AMPBOX Amplifier - Manual (Page 23)

23
DC Power Supply
+ –
Ampbox Current Input
See Section 3.2
+
+
–
–
A
Most common faults are:
• Power supply unit connected the wrong way around
(so no output is measurable)
• Data acquisition system is recording strange values (by incorrect calculations)
There is an easy way to check both issues by disconnecting the installation from the data acquisition system and short circuit
the input side of the AMPBOX. Please use either a voltmeter or current meter depending on your measurement configuration.
The short circuit will simulate 0 W/m² input. This means the output of the AMPBOX should be 4 mA.
Note The AMPBOX configured for a pyrgeometer will provide a different output (most likely 16 mA) as they have an offset.
This will ensure that you have a working power supply and a well configured AMPBOX at 4 mA. You can then connect this to the
data acquisition and should also record the same 4 mA. When this is not the case you should consider checking formulas, offsets
or configuration of the data acquisition system.
The same can be applied when using a voltage input. Disconnect the AMPBOX from the data acquisition system and measure the
voltage drop over the resistor when the AMPBOX is short-circuit at the input side.
A 500 R shunt resistor should provide a 2 V reading on the voltmeter when the input of the AMPBOX is short-circuit.
7. Troubleshooting
DC Power Supply
+ –
Ampbox Voltage Input
See Section 3.3
+
+
–
–
shunt
resistor