New SLM Calibration Log | Maintenance Logs

⚠ Use a Class 1 or Class 2 acoustic calibrator. Calibrate in a quiet area away from HVAC noise. Take a photo of the SLM with the calibrator attached before starting.

Job Details

Mobile / Unit *

Service Date *

Location

Technician First Name *

Technician Surname *

Machine Brand

Machine Model

Serial Number

Acoustic Calibrator Brand/Model

Calibrator Serial Number

Before You Start — Required Photo

Photo — SLM with Calibrator (Before) *

Damage Assessment

Component	Condition	Comments
Microphone capsule — check for dents, contamination
Windscreen / foam cover condition
External housing — cracks, loose buttons
Display screen
Battery compartment and contacts
Measurement cable (if external microphone)
Storage case condition

Service Checklist

Done	Task	Comments
	Clean microphone capsule surface (no pressure, dry lint-free cloth)
	Inspect and replace windscreen if torn or saturated
	Clean housing and screen
	Check battery level and contacts for corrosion
	Test A-weighting filter response
	Test C-weighting filter response
	Verify Fast and Slow time weightings
	Check memory/data-logging function (if applicable)
	Update firmware (if applicable)

Calibration Record

Step	Method / Target	Result	Comments / Measured Value
Acoustic Calibrator Check (94 dB @ 1 kHz)	Insert calibrator; adjust ref level to 94.0 dB; record actual reading
A-weighted Level (dBA)	Measure calibrator output with A-weighting; target 94 dB ± 0.5 dB
C-weighted Level (dBC)	Measure calibrator output with C-weighting; target 94 dB ± 0.5 dB
Fast Time-Weighting	Confirm Fast integration responds to impulsive signal
Slow Time-Weighting	Confirm Slow integration averages correctly
Reference Level Verification	Compare reading to accredited calibrator; record deviation
Post-calibration acoustic check	Re-insert calibrator; final reading ± 0.5 dB from 94 dB

Post-Service Functionality Check

Result	Check	Comments
	Readings within ±0.5 dB of acoustic calibrator
	A and C weighting filters functional
	Fast and Slow time weightings responding correctly
	Windscreen clean and in good condition
	Battery fully charged / replaced
	Calibration certificate attached (if sent to accredited lab)
	Next calibration due date recorded

After Service — Required Photo

Take the same photo as before to confirm the SLM and microphone are clean and reassembled.

Photo — SLM (After) *

Notes & Sign-off

Technician Notes

Technician Signature (type full name)

Technician Sign-off Date

Supervisor Signature (type full name)

Supervisor Sign-off Date

Post-Service Photos / Calibration Certificate (optional)