MAX 4000 PLUS ELECTROMETER 7
3 Rear Panel
1 External reset switch: In the unlikely event that the device stops responding, use a small
diameter rod to lightly press the internal button and reset the device.
2 RS-232 serial port: A standard 9-pin serial port for remote observation or data recording. This
port is for connection to equipment where no risk of external voltage exists.
3 2.1 mm Battery Charger Input: Connect the battery charger to this input jack when charging
the internal battery. Note: If the MAX 4000 Plus is being used in a patient environment, do not
plug in the charger. Connect to mains power through an isolation transformer only.
4 Setting up the MAX 4000 Plus
Before using the MAX 4000 Plus to take measurements, perform the following steps to ensure
accurate readings. The MAX 4000 Plus features an automatic zero function and a convenient
way to check battery status and bias level.
4.1 Warm Up and Zero Adjustment
1. Turn on the MAX 4000 Plus. Allow the unit to warm up for a minimum of 10 minutes. This
allows the temperature of the internal components to stabilize, and will help prevent the
measurements from drifting. If you choose to take measurements without warming up, be
aware that repeatability and leakage specifications may not be achieved until 10 minutes has
elapsed.
2. Select the desired Range of Operation, Low or High, with the arrow buttons, followed by the
MODE/ZERO button. Press the Start button to perform the zero adjustment. This process will
take 60 seconds.
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