RMO-A series of Micro Ohmmeters (hereafter referred to as “RMO-A”) contain 6 models: RMO100A, RMO200A, RMO300A, RMO400A, RMO500A and RMO600A.
All RMO-A models are based on a state of the art technology, using the most advanced switch mode technique available today. The main difference between these models is the maximum test current that can be generated (100 A for RMO100A, 200 A for RMO200A, up to 600 A for RMO600A model).
RMO-A generates a true DC ripple-free current with automatically regulated test ramps. During a test the RMO-A ramps with increasing current before measuring and decreasing current after the measurement. This significantly decreases magnetic transients.
The RMO-A instrument can store internally up to 500 measurements. All measurements are time and date stamped. Using the DV-Win soft-ware a test can be performed from a user’s PC, and the results can be obtained directly on the PC.
Communication between the RMO-A and a PC is through an USB (as standard) or an RS232 cable (as an option). Bluetooth communication interface is also available as an option.
Using the DV-Win the result can be arranged as an Excel spread-sheet which can be later shown as a diagram and printed for a report.
The set is equipped with a thermal and an overcurrent protection. The RMO-A has a very high ability to cancel electrostatic and electromagnetic interference in HV electric fields. It is achieved by very efficient filtration. The filtration is made utilizing a proprietary hardware and software.
The RMO-A instrument has three separate test modes:
SINGLE mode CONTIN mode DTRtest mode
Mains power supply
Connection according to IEC/EN60320-1; C320
Mains supply: 90 V – 264 V AC
Frequency: 50 / 60 Hz
Power consumption
Model @ 230 V AC @ 115 V AC
RMO100A 1210 VA 1150 VA
RMO200A 1890 VA 1880 VA
RMO300A 2360 VA 2170 VA
RMO400A 3520 VA 2650 VA
RMO500A 3930 VA 3850 VA
RMO600A 4560 VA 4040 VA
Fuse: type F
RMO100A & RMO200A 12 A / 250 V
RMO300A & RMO400A 15 A / 250 V
RMO500A & RMO600A 20 A / 250 V
Output data
Test current ranges and load intervals:
Model Test current Test duration
RMO100A 100 A *300 s
RMO200A 200 A 150 s
RMO300A 300 A 60 s
RMO400A 400 A 60 s @300 A
RMO500A 500 A 30 s
RMO600A 600 A 20 s
*test duration at 100 A test current can be up to 30 minutes as per request
Open circuit voltage: 10 V DC ± 2%
Full Load Voltages at maximum current
Model @ 230 V AC @ 115 V AC
RMO100A 7,25 V 6,90 V
RMO200A 7,10 V 6,10 V
RMO300A 5,90 V 4,70 V
RMO400A 6,60 V 4,30 V
RMO500A 5,90 V 5,00 V
RMO600A 5,70 V 3,70 V
Measurement
Resistance range: 0,1 µΩ – 999,9 mΩ*
*expandable from 0 Ω up to 6 Ω
Resolution
0,1 µΩ - 999,9 µΩ 0,1 µΩ
1,000 mΩ - 9,999 mΩ 1 µΩ
10,00 mΩ - 99,99 mΩ 10 µΩ
100,0 mΩ - 999,9 mΩ 0,1 mΩ
*1,000 Ω – 6,000 Ω 1 mΩ
Typical accuracy ± (0,1 % rdg + 0,1 % FS)
Display
LCD screen 20 characters by 4 lines;
LCD display with backlight, visible in bright sunlight.
Interface
RMO-A is equipped with an USB port
optional: RS232 (connection to an external computer)
optional: Bluetooth communication interface
Test Result Storage
RMO-A can store up to 500 measurements
Printer (optional)
Thermal printer
Paper width 80 mm / 3.2 in
NOTE
The print density is guaranteed within the range 5°C to 40°C, 20 to 85% relative humidity, no condensation. The printer can operate from 0°C to 50°C.
Dimensions and weight
Model Dimensions Weight
RMO100A 7 kg / 15.4 lbs
RMO200A (W x H x D) 7 kg / 15.4 lbs
RMO300A mm 198 x 255 x 380 7,5 kg / 16.5 lbs
RMO400A (W x H x D) in 7,5 kg / 16.5 lbs
RMO500A 7.8 x 10 x 15 8 kg / 17.5 lbs
RMO600A 8 kg / 17.5 lbs
Environmental protection
Ingress protection rating: IP50
Environmental conditions
Operating temperature: -10 ºC - +55 ºC / +14 ºF - +131 ºF
Storage & transportation: -40 ºC - +70 ºC / -40 ºF - +158 ºF
Humidity 5 % - 95 % relative humidity
Warranty: 3 Years