Byram Labs dm-210a Operating Instructions Manual page 4

6. Remember: Think Safety and Act Safely.
7. When testing for the presence of voltage, make sure
the voltage function is operating properly by reading a
known voltage in that range before assuming that a
zero reading indicates a no-voltage condition.
8. Calibration and repair should be performed by
qualified maintenance personnel only.
9. Do not attempt calibration or service unless another
person, capable
resuscitation is present.
10. Do not install substitute parts or perform any
unauthorized modification of the instrument. Return
the instrument to A.W. Sperry Instruments for service
and repair to insure that safety features are
maintained.
11. To avoid electric shock use CAUTION when working
with voltages above 40Vdc or 20Vac. Such voltages
pose a shock hazard.
12. Do not operate this instrument in an explosive
atmosphere (i.e. in the presence of flammable gases or
fumes, vapor or dust).
Sec. 5 PREPARATION FOR USE
Sec. 5.1 UNPACKING AND CONTENTS CHECK
The DMM's come 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 A.W. Sperry Instruments, Inc.
• Operating Instructions #314
• Test Leads TL-76 (one black, one red)
• 9V Transistor Type Battery (AWS Part #B-4)
• One Fuse installed
of rendering first aid
Sec. 5.2 PRE-OPERATION PROCEDURE
1. Install the 9V transistor type battery.
2. Inspect the instrument for any external defects by
comparing with the diagram on page 1. If any
abnormal conditions exist, do not attempt to take any
measurements. Refer to sections 9 (Maintenance) and
12 (Return for Repairs).
3. Insert the test leads into the "COM" and "V-Ω " jacks.
Connect the two ends of the test leads together.
and
4. Place the range selector switch into the off position.
Nothing will appear on the display. Place the range
selector switch into the following ranges shown in the
chart below. Check for the appropriate meter response.
Range
600DCV
200DCV
20DCV
2DCV
200
2K
20K
200K
5. As you can see, the decimal point moves as the
ranges are changed. The maximum display reading is
1999. The 200DCV range will actually only read
199.9Vdc. We call this the 200DCV range for
convenience only.
6. You can now check the decimal point on each range
by referring to sec. 3 Specifications where the ranges
are all listed. Refer to the Range and Resolution
columns to compute the decimal point location.
7. If any abnormal conditions exist, do not attempt to
take any electrical measurements. Instead refer to
sec. 12 Return for Repairs.
Display Reading
000 +/-4 digits
00.0 "
0.00 "
.000
1_ _.
1.
1_.
1_ _.