Текст страницы
Table 2
Parameter denomination
Value
Note
Set the rotary range switch to the desired AC measurement range А~.
Press the jaw opening button and open the jaws. Place one wire inside the
jaws.
Maximum display readout
1 9 9 9 (3 ½ digital symbols)
With automatic polarity detection
Measurement method
Dual-slope integrating ADC
Overload indicator
Number "1"
On the LCD display
Polarity indicator
Symbol « — »
When polarity is negative
1
Without fuse
IT IS FORBIDDEN
To carry out AC measurements of several conductors at once.
Read the measured current value from the display.
When finished, set the rotary switch to the "OFF" position.
Note – If the display only shows "1" in the left digit, it means that an overload
has occurred and the range switch needs to be set to a higher value.
Overload protection in all voltage
and resistance measurement
ranges
Maximum display readout
2–3 measurements per second
Case insulation
Double, class II
Measurement of DC and AC voltage values
Connect the black test probe to the "COM" socket, and the red test probe to
the "INPUT" socket of the ammeter. The polarity of the red probe is considered
positive.
DATA HOLD
Low battery indicator
On the LCD display
3
2
Measurement category
II
Use the rotary switch to select the desired measurement range for DC
voltage V or AC voltage V~.
1000
OFF
Memory function: "DATA HOLD"*
+**
200M
200
20M
1 – Сlip-on ammeter
2 – Jaw opening button
3 – Button for fixing the display readings
4 – Rotary switch for measuring function
5 – LCD display
6 – Socket inlet «20/200МΩ» is used for
2M
Jaw opening width, mm
50
2K
Hz
4
200
200
k
IP20
20
750
k
Degree of protection according
to IEC 60529
2k
1000
resistance measurements in the 20 MΩ
and 200 MΩ ranges
7 – Socket inlet "COM" for connecting
200
200
Power supply voltage, V
9
Battery type 6F22
20
2
Connect the test probes in parallel to the source or load.
Read the magnitude and polarity of the measured voltage from the display.
When finished, set the rotary switch to the "OFF" position.
Notes:
1 If the voltage value is not known in advance, set the limit switch to the 1000
V position, and then, switching to lower limits, achieve the required measurement
accuracy.
a negative polarity probe
8 – Socket inlet «INPUT» for connecting
Operating temperature, °С
0 … +40
At a relative humidity of no more than
80 %
2 If only the number "1" in the most significant digit is lit on the display, then
the input is overloaded, and it is necessary to set the range switch to a higher value.
5
Base altitude, m
Ј 2000
a positive polarity probe
9 – Battery compartment
Overall dimensions, mm
230ґ68ґ37
20/200MΩ
INPUT
COM
Mass, g
212
Electrical resistance measurement
Connect the black test probe to the "COM" terminal, and the red test probe to
the "INPUT" terminal; in case of measuring resistance above 2 MΩ, use the
"20/200M Ω" connector. The polarity of the red probe is considered positive.
8
6
Transportation/storage temperature
Minus 10 °C to plus 40 °C and
max. 80 % relative humidity
7
9
Set the rotary range switch to the "Ω" position and connect the probes to the
resistance being tested.
Storage conditions
In the manufacturer's package in
naturally ventilated rooms
Figure 1 – Front panel elements
Read the measured resistance value from the display.
When finished, set the rotary switch to the "OFF" position.
Disposal
In accordance with the legislation
in the territory of sale
The battery should be removed from
the device before disposal
Service life, years
10
ATTENTION
When measuring the resistance set in the circuit, make sure that the circuit is
disconnected from all supply voltages and the capacitors in the circuit are
Warranty period
(from date of sale), years
1
Warranty does not cover accessories –
test probes, battery and thermocouple
Н
* If the corresponding button is pressed, the display stays on and the icon appears on the display, until
the button is pressed again.
** "+" symbol means the presence of the specified function.
fully discharged.
Notes:
1 If the value of the measured resistance exceeds the maximum value of the
selected measurement limit, the display will show the number "1" in the most
significant digit.
Hz
Ammeter EXPERT series are capable of performing the following functions:
– AC current measurement ;
– DC voltage value measurement ;
– AC voltage value measurement ;
– electrical resistance measurement ;
– checking continuity of the circuit (Audible Continuity) ;
– temperature measurement (for type 266С) ;
– frequency measurement (for type 266F) .
2 If the measured resistance is 1 MΩ or more, the ammeter needs several
seconds to stabilize the voltage. This is normal for high resistances.
Complete set
The delivery set of the ammeter is shown in the table 4.
The measurement error is indicated in the following format:
± (X1% + X2 dgt), where
X1 – percentage of measured value
X2 – number of least significant digit values (dgt).
Checking continuity of the circuit (Audible Continuity)
Connect the black test probe to the "COM" socket, and the red test probe to
the "INPUT" socket of the ammeter.
200
200
Table 3 – Limits and error of measurements
Function
Range
Accuracy
Error
Note
Safety measures
Electric shock protection measures
When working with the ammeter, follow all safety and operating instructions
to avoid electric shock:
DC voltage (V )
200 mV
0,1 mV
± (0,5 % + 3 dgt)
266C
Set the rotary switch to the position " " (for types 266, 266С) or to
the position " " (for type 266F) and connect the test probes to two points on the
circuit being measured. If the resistance between them is less than 50 Ohm,
a beep will sound.
2 V
1 mV
± (0,8 % + 5 dgt)
266C, 266F
When finished, set the rotary switch to the "OFF" position.
– do not use the ammeter with a damaged case. Pay special attention to
sockets for connection;
20 V
10 mV
– do not use defective probes. Check the insulation of the probes at regular
intervals and, if necessary, replace the probes with ones of the same model;
200 V
100 mV
1000 V
1 V
± (1,2 % + 8 dgt)
266, 266C, 266F
Diode test (for type 266F only)
Connect the black test probe to the "COM" socket, and the red test probe to
the "INPUT" socket of the ammeter.
AC voltage (V~)
200 V
100 mV
± (1,0 % + 4 dgt)
266C, 266F
750 V
1 V
± (1,2 % + 5 dgt)
266, 266C, 266F
– use the probes supplied with the ammeter when working;
– do not exceed the threshold values given in table 3;
– if the value of the measured parameter is not known in advance, set the
maximum range;
AC current (A~)
20 А
10 mA
± (2,5 % + 13 dgt)
266C
– do not touch unused sockets when the ammeter is connected to the circuit
being measured;
200 А
100 mA
266, 266C, 266F
Set the rotary switch to the " " position.
Connect the red probe to the anode and the black probe to the cathode of the
diode being tested. The display will show the approximate voltage drop across the
diode when forward current flows through it. When connecting back, the display will
show "1".
When finished, set the rotary switch to the "OFF" position.
1000 А
1 A
± (2,5 % + 8 dgt)
266, 266C, 266F
– connect the test probe after the common probe is connected. Disconnect in
reverse order;
Resistance (Ω)
200 Ω
0,1 Ω
± (1,0 % + 10 dgt)
266, 266C, 266F
2 kΩ
1 Ω
266F
– do not measure resistance in a circuit that is energized;
– always be careful when working with voltages above 42 V. Keep your
fingers behind the barrier edge of the probes when measuring;
20 kΩ
10 Ω
266, 266C, 266F
Temperature measurement (for type 266С only)
Set the range switch to range °C or °F and the display shows the ambient
temperature value.
200 kΩ
100 Ω
266F
– do not use the ammeter with the battery compartment cover open or the
case loosely closed;
Connect the black thermocouple connector to the "COM" socket, and the red
thermocouple connector to the "INPUT" socket of the ammeter.
2 МΩ
1 kΩ
266C, 266F
– to avoid electric shock due to incorrect readings, replace the battery
immediately when the " " sign appears.
20 МΩ
10 kΩ
± (2,5 % + 5 dgt)
266C, 266F
Press the thermocouple against the object to be measured and read the
temperature readings on the display.
200 МΩ
100 kΩ
266C, 266F
–40 °С ~ 150 °С
1 °С
± (1,0 % + 4 dgt)
266C
When finished, turn the rotary switch to the "OFF" position.
Delivery set includes a K-type thermocouple with a maximum operating
temperature of 250 °C.
Temperature
measurement (°С; °F)
150 °С ~ 1370 °С
± (1,5 % +15 dgt)
266C
Measures for protecting the ammeter from improper use
To prevent damage of the ammeter, follow these recommendations:
– disconnect power and discharge high-voltage capacitors when measuring
electrical resistance, checking circuit continuity;
Frequency (Hz)
2 kHz
1 Hz
± (3 % + 5 dgt)
266F
ATTENTION
To avoid electric shock, make sure that the thermocouple
is removed from the instrument connector before carrying out other
– use the sockets, functions and measurement ranges according to this
passport;
Table 4
measurements.
– before turning the switch to change functions and measurement ranges,
disconnect the probes from the circuit under test;
Denomination
Qty, pcs. (copies)
Сlip-on ammeter
1
Frequency measurement (for type 266F only)
Connect the black thermocouple connector to the "COM" socket, and the red
thermocouple connector to the "INPUT" socket of the ammeter.
Test probes
1 pair
– when working on television receivers, monitors, and switched-mode power
supplies, be aware of the presence of high-amplitude surge voltages at some points
in their circuits which may damage the instrument;
– protect the ammeter from direct sunlight, high temperature and humidity.
9 V battery
1
Set the range rotary switch to "Hz" and connect the probes to a signal source
or load.
Carry bag
1
Passport
1
Read the frequency reading on the display.
When finished, set the rotary switch to the "OFF" position.
Operation rules
If malfunctions or errors occur during operation of ammeter, stop using it
immediately.
Additionally, the 266C ammeter is supplied with a thermocouple of "K"(TP-01) type – 1 pc.
Wipe the ammeter with a soft cloth; do not use abrasives or solvents for
cleaning. The ammeter electronic circuitry does not need to be cleaned.
When storing after operation, the following recommendations must be
observed:
Battery replacement
If the " " symbol appears on the display, the battery needs to be replaced.
To replace the battery, loosen the battery cover screw on the back of the
ammeter. Press down the cover with your thumb until the latches are released, then
remove the cover from the case.
Remove the previous battery and install a new one that conforms to the
specification: 9 V, type 6F22. Close the battery compartment cover in reverse order.
– disconnect all wires from the ammeter;
– make sure that the ammeter and accessories are dry;
– if you are not going to use the ammeter for a long time, you must remove
the battery, otherwise it may leak and damage the device.
ATTENTION
Before opening the battery compartment cover, make sure the probes are
disconnected from the devices under test and the rotary switch is in the
"OFF" position.
Instructions for working with the ammeter
AC current measurement
Make sure that the "DATA HOLD" button is not pressed.
Издание / Version 3
Weh
6
8
5
7