E N G L I S H
42
Auto Fuse Detection
The meter automatically verifies the integrity
of the internal fuses when you set the rotary
function knob to and plug 1 test lead into
either A terminal or mAμA terminal. In either
case, if an open fuse is detected, the word “
” shows on the primary display.
Battery and Fuse Replacement
The meter uses a single standard 9 V
battery (NEDA 1604, JIS006P, IEC 6F 22), a
1000V/440mA IR 10kA fast acting F fuse (F71)
for mAμA current input and a 1000V/11A IR
10kA fast acting F fuse (F72) for A current
input.
WARNING: TO AVOID FALSE READINGS,
WHICH COULD LEAD TO POSSIBLE ELECTRIC
SHOCK OR PERSONAL INJURY, REPLACE THE
BATTERY AS SOON AS THE LOW BATTERY
INDICATOR APPEARS.
Replace the battery or the fuses as follows:
1. Turn the rotary switch to OFF and remove
the test leads from the input terminals.
2. Remove the battery door by using a
screwdriver.
3. Replace the battery or the fuses with ONLY
specified replacement battery or fuses.
4. Reinstall the battery door by using a
screwdriver.
Trouble Shooting
If the meter fails to operate even with the
battery or fuse replacements, check it twice
over according to operating procedure as
described in this manual.
If the meter’s V/Ω input terminal has subjected
to high voltage transient (caused by lightning
or switching surge to the system) by accident
or abnormal operating conditions, the series
fusible resistors will be blown off like fuses in
order to protect the user and the meter. Most
measuring functions through this terminal
will then be open circuit.
In this case, the series fusible resistors and the
spark gaps should be replaced by qualified
personnel.
Refer to the LIMITED WARRANTY &
LIMITATION OF LIABILITY section for
obtaining warranty or repairing service.
7. SPECIFICATIONS
Safety & Compliances
Maximum voltage between any terminal
Ground: 1000V AC/DC.
Compliances: Complies with CSA C22.2 No.
1010.1-92, ANSI/ISA-S82, 01-94 ti 1000 V
Overvoltage Category III.
Certifications: UL & cUL standard UL 3111-1
Listed CE-marking certificated.
Surge Protection: 8 KV peak per IEC 1010.1-
92.
Fuse Protection for mA or μA inputs:
1000V/440 mA IR 10 KA Fast fuse.
Fuse Protection for A input: 1000 V/11 A IR 10
KA Fast fuse.
Physical Specifications
Display (LCD): Digital-5000 counts primary
display, 5000 counts secondary display; 4
updates per second. Nominal Analog-25
segments, 40 updates per second.
Operating Temperature: 0°C to 50°C.
Storage Temperature: -20°C to 60°C.
Temperature Coefficient: nominal 0.15 x
(specified accuracy) /°C @(0°C to 18°C or 28°C
to 50°C) or otherwise specified.
Relative Humidity: 0 % to 80 % @ (0°C to 35
°C) 0 % to 70 % @ (35°C to 50 °C).
Altitude: Operating – up to 2000m, Storage
– 1000m.
Battery Type: Single 9V battery –NEDA 1604,
Summary of Contents for UD87
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