Microwave Diodes
Most microwave diodes cannot be tested by a DMM with a diode test
function. This is because the DMM does not supply enough power to
turn these diodes on. UEi offers an accessory test lead, model ATL60,
that boosts the power output so that microwave diodes can be ade-
quately tested. Consult your distributor for more details.
M a i n t e n a n c e
Periodic service
WARNING!
Repair and service of this instrument is to be performed by qualified
personnel only. Improper repair or service could result in physical
degradation of the meter. This could alter the protection from
electrical shock and personal injury this meter provides to the
operator. Perform only those maintenance tasks that you are
qualified to do.
These guidelines will help you attain long and reliable service from
your meter:
1. Calibrate your meter annually to ensure it meets original
performance specifications.
2. Keep your meter dry. If it gets wet, wipe it dry immediately. Liquids
damage electronic circuits.
3. Whenever pra c t i cal, keep the meter away from dust and dirt, which
can cause premature wear.
4. Although your meter is built to withstand the rigors of daily use, it
can be damaged by severe impacts. Use reasonable caution when
using and storing the meter.
Cleaning and Decontamination
Periodically clean your meter’s case using a damp cloth.
DO NOT
use
abrasives, cleaning solvents or strong detergents, as they may damage
the finish or affect the reliability of the structural components.
Battery Replacement
Always use a fresh replacement battery of the specified size and type.
Immediately remove the old or weak battery from the meter and dis-
pose of it in accordance with your local disposal regulations. Old or
defective batteries can leak chemicals that corrode electronic circuits.
WARNING!
To avoid electric shock, be sure to turn off the meter’s power and
disconnect both test leads from any equipment before you remove
or install batteries.
To install a new battery, follow these procedures:
1. Unplug the test leads and remove the rubber boot from
the instrument.
2. Remove the screws in the rear of the instrument and separate the
front and rear housing.
3. Replace the battery and/or fuses with the same type and size as the
one removed.
WARNING!
Under
NO
circumstance should you expose batteries to extreme heat or
fire as they may explode and cause injury.
NOTE:
If you do not plan to use the meter for a month or more,
remove the battery and store it in an area that won’t be damaged by a
leaking battery.
4. Snap the front and rear housing back together and reinstall
the screw s .
5. Reattach the rubber boot.
S p e c i f i c a t i o n s
DM420-MAN
P. 4
Operating Temperature
32˚ to 104˚F (0˚ to 40˚C)
Storage Temperature
-4˚ to 140˚F (-20˚ to 60˚C)
Relative Humidity
0% to 80% RH
Battery Type
9V, NEDA 1604 or 6F22 or 006P
Size (with boot)
2.25” x 3.875” x 7.35”
Weight (with boot)
1 lb., 3 oz.
Safety
Meets or exceeds IEC348, CAS
C22.2, No. 231, ISADS82 and UL1244
