G.R.A.S. Sound & Vibration
Single-channel Low-noise Measuring System consisting of: Type 40HT and Type 12HF - Page 10
2.3
Battery Pack
To gain access to the battery pack, unscrew the locking screw on the rear panel (Fig. 2.3) and
slide the base plate off towards the rear. Pull out the battery pack See Fig. 2.4.
The battery pack consist of a battery holder and 4 x LR14 (C) standard alkaline cells. When
replacing the batteries, replace all of them making sure that the polarity is as indicated on the
battery holder.
Fig. 2.4 Showing the battery pack of the Power Module Type 12HF
