ETS-Lindgren HI-1801 Microwave Oven Survey Meter - Manual (Page 10)

10 | Maintenance
2. Remove the two screws that hold the instrument cover in place.
3. Remove the foam block that holds the batteries then remove the
batteries.
4. Replace the batteries and re-insert the foam block. Replace and
tighten the two screws that hold the instrument cover in place.
5. Make sure the LOW BATT indicator light is not on indicating the
batteries are fully charged.
S PACER C ONE R EPLACEMENT
Do not use the HI-1801 without the spacer cone in
position. To maintain stated instrument accuracy,
only use spacer cones provided by ETS-Lindgren.
The spacer cone must be replaced when worn or contaminated. A polystyrene
cone shield provides protection for the relatively soft material of the cone.
1. Remove the old cone by pulling straight up and off the end of the
probe.
2. Slip a new cover on, being sure the cover is fully seated on the probe.
Annual Calibration
It is recommended that the Model HI-1801 Microwave Survey Meter be
recalibrated every 12 months. See the Product Information Bulletin included with
your shipment for information on ETS-Lindgren calibration services.