The instrument measures the electric resistance to direct current of windings of power transformers, of instrument voltage transformers, of instrument current transformers, of electric motor windings, of electric magnets, reactors, etc.
Automatic selection of the measurement range.
High precision: error does not exceed 0.1%.
MIKO-7 with advanced functions - production of the device is discontinued. A new version of MIKO-7M with be delivered to the warehouse in the IV quarter of 2018
MIKO-8 - production of the device is discontinued. A new version of MIKO-8M with be delivered to the warehouse in the IV quarter of 2018
| Range of measurement | 10 mkOhm ÷ 1 kOhm | automatic selection of the measurement range |
| Time of measurement | from 10 sec | time depends on inductance of the measured object. Maximum measurement time on the ОРДЦ-533000/330000 transformer is 7 min 51 sec. |
| Error of electric resistance measurement | ± [0.001R + 0.5] mkOhm | R - measured resistance. |
| Instrument current amperage | 0.0014÷10.0 A | automatic selection of the instrument current range. |
| Instrument current drift | 0.0002 %/sec. | in a minute after the measurements start. |
| Maximum output voltage | 22 V | ensures rapid growth of instrument current in the inductive circuit. |
| Limits of specified output power | 0,3; 1; 5; 20; 62 W |
| Power supply | ||
| network voltage | 100÷242 V
100÷300 v | |
| power voltage from the battery | 11÷14 V | |
| Maximum consumed power | 120 W | |
| Parameters of a instrument block | ||
| L x W x H | 270×250×130 mm | high operating currents at small size. |
| weight | 3,2 kg | |
| Working temperature |
−20 ÷ +40ºС | the instrument is subjected to acceptance tests at a temperature of ambient air from -30 to +50ºС. |
| IP rating of the instrument | ||
| IP for transportation | IP64 | in closed state the instrument can be subjected to different impacts and does not require specific conditions for transportation. |
| IP rating in operating state | IP20 | |
| Rating of protection from current injury | I | instrument current is never exceeded; polarity reversal of cable ends and self-inductance of electromotive force in case of occasional cable disconnection are eliminated. |
| Warranty period | 1 year | |
| Service life | 10 years | |
| Gauging period
The values of variables that determine the milliohmmeter accuracy gradually change during its operation. Gauging implies correction of variables for ensuring the accuracy of readings. | 3 years | |
| Inter-testing period | 1 year |
|
Connect the instrument or to the electric network (220 W) or to a battery (12 W)
Simultaneous power supply from the network and the battery is not recommended.
Connect the red clamp of the cable to a plus battery terminal, the black one connect to minus battery terminal.
The instrument identifies the power source.
To start measurements, press «Start/Stop»
Determination of current in the winding.
Measurement is in progress
Replacement of three arrows ↓↓↓ by two ↓↓, then by one ↓ means continuous resistance reduction. Hence, the process of resistance identification is normal.
If arrows are replaced by a rhomb ♦, the measurement can be stopped by pressing «Stop».
The measurement is over. The readings are shown.
For repeated measurement press «Start/Stop».
To go back, press «Cancel».
| Instrument block of MIKO-7 | |
| A set of wires and attachments | |
| SKB031.23.00.000 | Main cable |
| SKB010.01.00.000 | Ground wire |
|
| Shunt 75 ШСМ М3.75-0,5. Rsh=1.0 mOhm
It is designed for expanding the measurement range. Voltage drop at voltage fans at rated current makes 75 mV for all the shunts. |
| Two safety devices ВП2Б-1В-2А | |
| SKB023.15.00.000 | Gauging equivalent of zero resistance |
| SKB126.06.02.000 | Bag №2 |
| Documentation | |
| SKB131.00.00.000OM
SKB131.00.00.000TP | Operations Manual
Technical passport Gauging Certificate CD with documentation and software |
Additional accessories (for extra pay) | |
| SKB031.18.00.000
| Instrument cable, 8.5 m
"crocodiles" with jaws opening of up to 37 mm. |
| SKB031.21.00.000
| Instrument cable, 8.5 m
measurement from ground (35 kV), from the transformer cover (35÷500 kV), "crocodiles" with jaws opening of up to 80 mm. |
| SKB031.19.00.000
| Instrument cable, 3 m
resistance measurement following the four-terminal circuit in the inductive and non-inductive circuits. Two probes with red insulation and two probes with black insulation, "crocodiles" A25C. |
| SKB031.20.00.000 | Extender for instrument cables 6.5 m. |
| SKB031.17.00.000 | Cable for power supply from the battery 5 m. |
| СКБ126.06.00.000 | A bag for cables and documentation |
Certificate of the instruments type approval, 0,1 Mb
Passport, 0,4 Mb
Operations Manual, 0,5 Mb
Methodology of check, 0,3 Mb
