THM420 Specifications
2
Handheld and Benchtop Instruments Basic Service
Specifications
The characteristics listed in this section apply under the following conditions:
H The instrument operates in an 18_ to 28° C ambient environment unless
otherwise noted.
NOTE. All specifications are warranted unless marked “typical.” Typical
characteristics are not guaranteed but are provided for the convenience of the
user.
Table 1: General Specifications
Characteristic Description
Display 3#4 digit (4000 count) LCD
Polarity Display Automatic
Overrange Display OVER is displayed
Low Voltage Indicator Battery indicator is displayed
Measurement Rate 50 ms
Automatic power-off time Approximately 30 minutes
Power Six AA UM-3, R6, dry cell batteries
Battery Life Back light Off: typically greater than 10 hours using six alkaline batteries
Maximum Floating Voltage 600 VAC
RMS
CAT II (or 850 VDC) between any terminal to earth and ground
Maximum Input Voltage 600 VAC
RMS
CAT II (or 850 VDC) between V and COM
Maximum Input Current
Between mA and COM 400 mA
Between A and COM (10 A for 2 minutes) 8 A
Maximum Open Circuit Input Voltage
Between A and COM 600 V
Between mA and COM 350 V
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