YJS Tech Co., Ltd. Registration No.128-81-27456 Company Logo YJS Tech Co., Ltd. Registration No.128-81-27456
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Digital micro-ohmmeter

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  • Model Number : DO7


The ruggedly designed digital micro-ohmmeter, the DO7, is a veritable workhores, ideal for use in the workshop, field or test facilities. Sealed in an ABS plastic case, the DO7 has built in rechargeable batteries which allow one hour's continuous use on the lowest ranges, and up to 20 hours on the others.

The DO7 is ideal for a range of resistance measurements in cluding:

Rotating machines
Switch contacts
Electrical connectors
Crimped joints
PCB track
Cable Joints
Earth bonding
Small transformer windings
Heating elements
Quality of wrapped joints
Quality of solder joints
Cable Lengths
  • True 4 wire measurements eliminate lead resistance errors
  • 6 push button ranges 600 µΩ.. 60Ω
  • Resolution of 0.1 µΩ on 600 µΩ range
  • 0.8" LED display, daylight viewable
  • 10 amp measuring current
  • Input protection to 415 Volts rms
  • Forward and reverse current measurement
  • Auto average of forward and reverse measurement
  • Digital calibration, key protected
  • Mains rechargeable with battery state indicator

Technical Data

This portable Digital Ohmmeter is a practical instrument for low resistance measurement, ideal for use in the workshop, field or test facilities. It is of rugged construction, contained in a sealed ABS plastic case with lid and carrying handle.

The DO7 has many advanced features, including protection up to 415 volts rms at the measuring terminals, digital calibration and long scale length 6000 count. Rechargeable batteries means real portability with more than 1 hour's continuous operation on the lowest ranges and 20 hours on all others.
Battery charge indicators are provided. The internal charger will boost charge to 90% of full charge, switching automatically to a trickle maintenance charge. Warning LEDs illuminate when an open circuit lead condition is detected.

A front panel soket provides a serial RS232 output for connection to an external printer or PC, and a socket is also provided for the connection of an external start switch, eg. a foot switch

The DO7 is supplied ready for use with batteries, mains cord and test leads - no extras are normally necessary, For special lead sets we offer a variety of different styles which are listed in this leaflet, together with calibration standards.

Typical Current
Uncertainty @ 20°C ±5°C, 1 year
Temperature Coefficient / °C
60 Ω
6 Ω
600 mΩ
60 mΩ
6 mΩ
600 µΩ
10 mΩ
1 mΩ
100 µΩ
10 µΩ
1 µΩ
0.1 µΩ
1 mA
10 mA
100 mA
1 A
10 A
10 A
±(0.15% Rdg + 0.05% FS)
±(0.15% Rdg + 0.05% FS)
±(0.15% Rdg + 0.05% FS)
±(0.15% Rdg + 0.05% FS)
±(0.2% Rdg + 0.1% FS)
±(0.2% Rdg + 0.2% FS)
40 ppm Rdg + 30 ppm FS
40 ppm Rdg + 30 ppm FS
40 ppm Rdg + 30 ppm FS
40 ppm Rdg + 30 ppm FS
40 ppm Rdg + 30 ppm FS
40 ppm Rdg + 250 ppm FS

4 Terminal Kelvin/Thomson principle eliminates error due to lead resistance. Open circuit measurement voltage, ~2V dc.

0.8" LED 6000 count with automatic decimal point and polarity indication.

6 Push button selected with LED indication.

Digital, security key protected.

415 rms maximum at in put terminals.

Sealed lead acid, rechargeable cells giving a minimum of 1 hour's continuous measurement on the lowest 10 amp renges and 20 hours on all other ranges. Internal charger with battery state indicator.

6mm binding posts accept spade tags and 4mm banana plugs.

Working Temp
0... 40°C rel. humidity 80% max. non-condensing.

Storage Temp
-20... + 50°C

Mains Supply
100/120/220/240/ Volts + 10% -13% 47... 63Hz. max 80VA

IEC 348 Protective Class 1.

343 x 327 x 152 mm (W x D x H)

8kg approx.

Supplied complete with mains cord, measuring leads with Kelvin Clips, handbook, and certificate of conformity.

External Start Foot Switch (FS01)
Foot switch with 2 metre connection lead for connection to the external start socket.
Portable printer (PR01) Portable thermal printer with rechargeable batteries, supplied complete with connection cable.
Additional Lead Sets
LS01 Duplex lead set with 3 metre lead length.
LS02 Duplex lead set with 3 metre lead and 15 metre lead length.
LS03 Large Crocodile style Kelvin clips with 3 metre lead length. LS04 Large crocodile style Kelvin clips with 3 metre lead and 15 metre lead lengths.

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