SECTION B - 620UK EXPLOSIVE SAFETY
OHMMETER - SPECIFICATIONS
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* Actual fail-safe currents vary with each instrument and may be ±20% from the typical value.
Table B-2. Specifications
Accuracy:
(for 1 year @25°C ± 10°C)
2.0 ohm range . . . . . . . . . . . . . . . . . . . . . . . . ± 0.02% of reading ± 0.05% of range
20 ohm range thru 20K ohm ranges . . . . . . . . . . ± 0.02% of reading ± 0.02% of range
200K ohm range . . . . . . . . . . . . . . . . . . . . . . ± 0.05% of reading ± 0.05% of range
2.0M ohm range . . . . . . . . . . . . . . . . . . . . . . . . . ± 1.0% of reading ± 0.2% of range
Temperature Range -
Operating
. . -20°C to +40°C, Storage . . . . . . . -10°C to 70°C
Temperature Coefficient
2.0 ohm through 20 K ohm ranges . . . .
±0.002% per °C (from 0°C-15°C and 35°C-50°C)
2.0 M ohm
range
±0.02% per °C (from 0°C-15°C and 35°C-50°C)
Instrument Display
. . (20,000 counts) 4½ digit Liquid Crystal Display (LCD) with a
back light for viewing the 620UK display in dim ambient light conditions.
Low Battery Indication
. .The 620UK LCD Displays shows “
LOW BAT
”
Over-Range Indication
. . . “
i
and
blank digits
” in the 620UK LCD display
Measurement Update Rate
. . . . . . . . . . . . . . . . Approximately 3 readings per second
Open Circuit Current Source Compliance Voltage
. diode clamped at <1.4 volts
Power
. . . . Battery Pack inside separate metal box houses (4 ea "AA") 1.5V Alkaline batteries,
requires tamper-proof security screwdriver
Dimensions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.0" W x 8 " D x 2.5" H
Weight
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 lbs net; 16 lbs shipping
Calibration Access
. . . . requires tamper-proof security screwdriver
: use only Duracell Plus Type MN1500, or
Eveready Silver
Seal type R65 or Eveready Ultras Plus, Silver Seal type R6F4UP, Varta Type 3006, or GP Type GP15
620UK
Resistance Range/Resolution Nominal Test Current/Fail-Safe Current
7
