TSI Instruments SidePak AM520 - Zeroing the Instrument (Zero Cal)

Operation
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There are three items on the Calibration menu.
Zero Cal
This activates a function which
re-zeroes the measurement
using a filter.
Flow Cal
This activates a function which
allows you to set the pump
voltage to achieve the desired
sample flow.
User Cal
This allows you to select a
photometric calibration
factor and response factor
to adjust the instrument
response to more closely
match the properties of the
aerosol being measured.
Zeroing the Instrument (Zero Cal)
For best results, it is important to zero the
instrument before each test. This ensures
accurate data, especially for low aerosol
concentrations. The process only takes a
few minutes.
1. Locate the zero filter provided with the
AM520/AM520i kit and attach it to the
inlet of the SidePak™ monitor.
2. Start the instrument by pressing the
ESC-ON/OFF key. After the monitor
goes into SURVEY mode, press the
ESC key to reach the MAIN MENU.
3. Under MAIN MENU, use the ▲ ▼
keys to scroll to CALIBRATION and
press  (ENTER).
4. Under the CALIBRATION menu, use
the ▲ ▼ keys to scroll to Zero Cal and
press  (ENTER).
5. The instrument will prompt you to attach the zero filter to the inlet.
When the zero filter is connected, press  (ENTER).