Sec. 5 FRONT PANEL CONTROLS
(See Fig. 1)
1. Digital Display: 3-1/2 digit LCD, 0.5" numerals, maximum reading 1999 with
automatic sign and " " annuciators. 3-1/2 digit LCD with Automatic func-
tion and range annunciators including the following: " “ "-".
2. Range Selector Rotary Switch: Rotating this switch will turn the DMM on or
off as well as change the function. For the available functions your DMM
has refer to section 3 (Specifications).
3. Input Terminals: These terminals should be used in conjunction with the
position of the function switch.
Sec. 6
PREPARATION FOR USE
Sec. 6.1 UNPACKING AND CONTENTS CHECK
The DM-4400A comes complete and ready to use. Check the
following contents list when unpacking. If any pieces are missing
notify the distributor you purchased the instrument from or
Sperry Instrument, Inc.
• Operating Instructions # 415
• Test Leads TL-54 (one black, one red).
• 9V Transistor type Battery See Battery
replacement section 10.2 for proper installation.
• One Fuse installed, one spare Fuse Part # F-17; 0.5A,
250V, 5mm X 20 mm, fast acting (See Fuse Replacement
section 10.3)
Sec. 6.2
PRE-OPERATION PROCEDURE
1. Install the 9V transistor type battery See Battery
Replacement procedure in section 10.2.
2. Inspect the instrument for any external defects by comparing
with the diagram on page 6. If any abnormal conditions exist, do
not attempt to take any measurements. Refer to sections 10
(maintenance) and 14 (Return for Repairs).
7
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