1 PC9D digital micro ohmmeter Summary
PC9D Digital micro ohmmeter is used for measuring coil, electric motor, transformer winding, cable wire resistance; contact resistance switch plug, socket and electrical components; resistance vessels, vehicles, aircraft riveted metal etc.. Instrument reservation RS232 Interface, user can realize intelligent management. The instrument has high measuring accuracy, stable performance, the advantages of wide measuring range, strong anti-interference ability, simple operation etc..
2PC9D type digital micro ohmmeter specifications and technical characteristics
Two point one The main technical parameters and specifications
Two point two The characteristics of products
A SCM intelligent control.
B The value transformation of automatic and manual two. Display unit of resistance M Omega, omega, K Omega.
C The whole range of upper and lower limit alarm settings.
D Four and a half digital display, overrange display 00000 Flashing.
E Four terminal measurement, in order to eliminate the effect of the contact and lead resistance measurement.
F Optional RS232 Interface。
Two point three The conditions of use
temperature Five C ~ Thirty-five C
relative humidity 25% ~ 75%
AC power supply 220V Tolerance. 10% 50Hz
No strong electromagnetic interference source, without a lot of dust and corrosive gas, good ventilation.
Two point four The power consumption of about 20W
Two point five Size 270mm * 360mm * 120mm
Two point six weight 4.5 kg
3 PC9D digital micro ohmmeter The structure and working principle
Three point one Working principle
The constant current output a constant current flowing through the measured resistance Rx And the formation of a voltage drop, the preamplifier, by
A/D The converter is converted into digital quantity to send CPU Digital processing, sending display readings. From the principle of Rx=V/I So, as long as the guarantee V and I The measurement accuracy can be accurately measured resistance value.
Three point two The instrument function key layout
One Monitor ( Read resistance value .2) The unit of resistance "lamp
Three "Automatic range lights" . 4 "alarm" lamp
Five "Manual range lights" ..6. "The data latch" lamp
Seven The "alarm" lamp ..8. "The upper limit alarm lamp
Nine The "lock" button ( data 10) "Key"
Eleven "Key" Twelve "The range selection" button
Thirteen "Set" button Fourteen The "power switch"
One communication interface ( Matching 2) "Current" test end ( Check with )
Three Nameplate ..4 "Voltage" test end ( Check with )
Five Power supply socket ( Fuse )
4 PC9D digital micro ohmmeter Safety precautions
Four point one Before using please read the instructions and follow the instructions step in operation.
Four point two Do not use non original accessories, in order to avoid danger.
Four point three The wire must be tested in line measuring resistance with special test line when the instrument is in the same direction, in order to ensure
Measurement accuracy.
Four point four The instrument panel and the rear panel test terminal can not access at the same time the object to be measured, so as not to affect the accuracy of measurement.
Four point five Good contact contact surface test analyte and special test line clip.
Four point six The measurement must be carefully check whether the wiring is correct, to determine the correct, can be tested.
Four point seven Since the start of the test, not to adjust the instrument any key, and the contact line test and measured object.
Four point eight Avoid using in the following circumstances:
A Avoid placing the sunlight, rain and moisture.
B Please stay away from fire and heat, to prevent the high temperature of the machine.
C Handling or maintenance, should be shut down and will remove the power line.
5 PC9D digital micro ohmmeter Use and operation
Five point one Preparing for use
5.1.1 The instruments used for testing line plug panel "test end", the power is switched on, then the instrument in the open state,
Over range display" 00000 "Stay by hot flashes, instrument 15min Before use.
5.1.2 Function key description
A "Set" button to click the "set" button, "alarm" and "limit alarm lights, instrument into the" upper limit alarm "set state. Then press the "select range" button to select the desired range ( Including the unit of resistance and numerical decimal point ) Then, according to the "" or "" button to change the values to the required alarm limits, then press "set" button, then the upper limit alarm value set. At the same time, the "alarm" and "alarm" light instrument into the "alarm" set, repeat set upper limit alarm value method; and then click "Settings" button, then the lower limit alarm value set. Back to the state of measurement instrument.
For example: if you want to set the upper limit for the One hundred Omega, the lower limit value is Eighty Omega. First click the "set" button, "alarm" and "warning lights, press the" select range "key to * * * . * * Omega file, then press "" or "" key and digital modulation" One hundred ", then click" Settings "button, then the upper limit alarm value set. At the same time, the "alarm" and "alarm" light instrument into the "alarm" set, repeat set upper limit alarm value method, the digital modulation" Eighty ", then click" Settings "button, then the lower limit alarm value set. Back to the state of measurement instrument.
B "The range selection" button press "range select" button, the "automatic range" or "manual range lights; can also according to the" unit "lamp and the location of the decimal point to confirm the selected range, range settings are" automatic range"," Zero point two zero zero ~ One point nine nine nine nine " K Omega," Twenty ~ One hundred and ninety-nine point nine nine "," Two ~ Nineteen point nine nine nine "," Zero point two Zero Zero Zero ~ One point nine nine nine nine "," Twenty ~ One hundred and ninety-nine point nine nine " M Omega," Zero ~ Nineteen point nine nine nine " M Omega, a total of six stalls. Should pay attention to if the selection of "manual range" measurement:
(1) According to the measured resistance value must be selected in the required measuring range, to ensure the accuracy of measurement.
(2) If you can not estimate the measured resistance value, can range from the highest, followed by moving to low, until the right
The measuring range so far.
C "Key"
Every click this button to display the value increasing.
D "Key"
Every click this button, the display value will decline.
E The "lock" button
The user can use the key to maintain a resistance value to record in the process of testing.
The method is as follows: when the measured resistance value is stable after, press the "latch" button, "data latch" light that measured
The resistance value of the reading has been well preserved, is convenient for the user to make a record. According to a "latch" button, "data latch off",
Exit data latch state.
Five point two Operation steps
5.2.1 Resistance measurement
The completion of the Five point one A program, the special test line end to clip Four Shown well connected with the analyte, to display
In the stable, the display value is the resistance value of the measured object.
5.2.2 Large inductance resistance measurement ( Such as power transformer )
The completion of the Five point one A program, the special test line clip according to the diagram Five Shown well connected with the analyte, the range selection"
Key should be measured in the "manual range" file, to display a stable reading, the display value of the measured object is power
Resistance.
Because the test will produce large current, resulting in "automatic" judgment is not accurate, so that the measurement is not stable, impact test
The amount of accuracy.
Six Common faults and troubleshooting
Six point one Turn on the power switch, the display does not light. To cut off the power, check whether the rear socket fuse intact.
Six point two In the test, the instrument test value error, please check whether the correct choice of range.
Six point three In the test, the instrument display value is zero or a reading of any value, please check the measuring line is opening or not
Good.
Six point four The instrument connected to the analyte always alarm, please check whether the alarm value set and whether the correct settings or alarm value
Is not set correctly.
Seven Zero check and check
Seven point one Instrument zero check
If users need to check the instrument zero according to plans Six The test line for special wiring, the attached plug is inserted into the instrument side, on the other
The two end of the clip should be cross connected, and one end of a wire clamp in the same direction. Because the instrument can be resistance micrometer level ohmic contact may lead to bad, so the small resistance value influence the accuracy of measurement, so the user can try several different contact angles, the display value is zero.
Seven point two Check resistance measurement
Users need homemade four wires, and then press the map Seven As shown, respectively, one end of the wires with standard resistor connected, a wire
On the rear end and the instrument terminal connected corresponding symbol. Then according to the Five Chapter operating procedures, can be measured.
Eight Maintenance
Eight point one The instrument needs regular maintenance and maintenance can prolong its service life.
Eight point two Cleaning and maintenance of equipment, be sure to turn off the power switch.
Eight point three Line, special test line and terminal, if damaged, please replace the same size in parts.
Nine Complete sets of equipment
PC9D A type of digital micro ohmmeter
A special test line
A power line
Use a Book of instructions
A certificate
Ten Other
Ten point one The instrument should keep the temperature in the room Zero C ~ Forty C, relative humidity of not more than 80% In the air, and not
Enough to contain harmful substances caused by corrosion.
Ten point two Since the date of purchase instrument users Twelve Within a month, when users use fully comply with the rules in the specification,
And the user is not without changes inside the instrument structure, it is found that the instrument can not work normally, the factory responsible for free to replace or repair.
Ten point three Factory has the right to make changes without notice of the instrument.
One baud rate 9600bps ,
Frame format: start bit +8 Bit data + Stop bit.
2 RS232 Pin definition interface: 2 (TXD) 3 (RXD) 7 (GND) .
Three When the host computer through the communication protocol RS232 Export to the instrument issued an address code (No. 01H After the instrument is continuous) to the host computer sends (all measurements ASCII Code)
No. One - Five Byte: measured value
No. Six Byte: measurement range
No. Seven Byte: the discrimination (" P "Qualified;" F "As the alarm)
Then the article: One byte ASCII " One "(No. 31h )
No. Two byte ASCII " Two "(No. 32H )
No. Three byte ASCII " Three "(No. 33H )
No. Four byte ASCII " Four "(No. 34h )
No. Five byte ASCII " Five "(No. 35h )
No. Six byte ASCII " Five "(No. 35h )
No. Seven byte ASCII " P "(No. 50h )
Attached: RS485 The communication format agreed as follows
One baud rate 2400bps ,
Frame format: start bit +8 Bit data + Stop bit.
Two standard RS485 The level of DB25 (interface Eight Foot and Nine Foot)
Three Communication protocol:
When the host computer through the RS485 Export to the instrument issued an address code (No. 01H After the instrument is continuous) sent to the host computer test
Value (all ASCII Code)
No. One - Five Byte: measured value
No. Six Byte: measurement range
N=0 Express XX.XXX M Omega
N=1 Express XXX.XX M Omega
N=2 Express X.XXXX Omega
N=3 Express XX.XXX Omega
N=4 Express XXX.XX Omega
N=5 Express X.XXXX K Omega
No. Seven Byte: the discrimination (" P "Qualified;" F "As the alarm)
Example: measured value: 1.2345k Omega result is qualified, the received data is:
Then the article: One byte ASCII " One "(No. 31h )
No. Two byte ASCII " Two "(No. 32H )
No. Three byte ASCII " Three "(No. 33H )
No. Four byte ASCII " Four "(No. 34h )
No. Five byte ASCII " Five "(No. 35h )
No. Six byte ASCII " Five "(No. 35h )
No. Seven byte ASCII " P "(No. 50h )