27-27T : 28-09-2012
DIGITAL CLAMP METER
MODEL :
27-AUTO/27T-AUTO
INSTRUCTION MANUAL
®
1
4
Temperature (27T-AUTO only)
Range
: -20
0
C to 750
0
C
-4
0
F to 1400
0
F
Accuracy
: ± (3% rdg + 5 dgts)
Resolution
: 1
0
C / 1
0
F
Sensor
: K type thermocouple
2. OPERATION
Before taking any measurements, read the safety information section.
Always examine the instrument for damage, contamination (excessive
dirt, grease, etc.) and defects. Examine the test leads for cracked or
frayed insulation. If any abnormal conditions exist do not attempt to
make any measurements.
AUTO POWER OFF (APO)
The meter will be switch off if no range switch or key is used for approx
15 minutes.
FUNCTION BUTTON
The Button is used for select
/ range and
0
C/
0
F (27T-AUTO only)
HOLD BUTTON
Press Hold button to toggle in and out of Hold mode, In the Hold mode,
the “ H ” annunciator is displayed.
MAX BUTTON
Press MAX button to toggle in and out of MAX mode (holding the highest
absolute reading) In the MAX mode, the “ MAX ” annunciator is displayed.
This function is available for DCV, ACV & Current ranges.
2.1 Current Measurements
1.
Set the Range switch to the highest 400A range.
2.
Press the trigger to open transformer jaws, clamp onto one
conductor only and release trigger. Jaws should be completely
closed. Read the current directly on the display. It is
recommended that the conductor be placed at th e center of
the closed jaws for maximum accuracy (Fig. - 1).
1. SPECIFICATIONS
1.1 General Specification
Display
n
3
½
digit liquid crystal display (LCD) with a
maximum reading of 2000 counts.
Polarity
n
Automatic, positive implied, negative polarity
indication.
Overrange
n
(OL) or (-OL) is displayed.
Zero
n
Automatic.
Low battery
n
“ ” is displayed when the battery
indication
voltage drops below the operating level.
Measurement
n
3 times per second, nominal.
rate
Operating
n
0°C to 50°C at < 70% relative humidity.
Environment
Storage
n
-20°C to 60°C, 0 to 80% R.H. with battery
Temperature
removed from meter.
Accuracy
n
Stated accuracy at 27
0
C ± 5
0
C,
<75% relative humidity.
Power
n
Two 1.5V ‘AAA’ Size Battery
Battery life
n
200 hours typical
Dimensions
n
185 x 65 x 28mm (approx.)
Weight
n
170gms including battery (approx.)
Accessories
n
Pair of test leads x 1, Instruction manual x 1,
1.5V batterys (installed) x 2,
Carring Case x 1, (K type thermocouple upto
260
0
C for 27T-AUTO only) x 1
Maximum Jaw
n
25mm
Opening
2
1.2 Electrical Specification
Accuracies are ± (% r number of digits) at 27 ± 5°C and
humidity of less than 75% RH.
AC CURRENT (Auto Ranging) 50-60Hz
DC VOLTAGE (Auto Ranging)
Range
Accuracy
Overload Protection
600V
±(0.8% rdg + 3 dgt)
600V DC / AC rms
Range
Accuracy
Overload Protection
600V
±(1.2% rdg + 3 dgt)
600V DC / AC rms
RESISTANCE (Auto Ranging)
Range
Accuracy
Overload Protection
20M
V
V
V
V
V
±(1.2% rdg + 3 dgt)
250V DC / AC rms
AC VOLTAGE (Auto Ranging) 50-60Hz
Continuity Check
Threshold Level
: 40
V
Approx.
Response Time
: 1m Sec. Approx.
Open Circuit Voltage : 0.4V Approx.
Indication
: ‘ ’ is displayed on LCD and buzzer sounds
at continuity.
Diode Test
Measurement Current : 1.0 ± 0.6 mA Approx.
Open Circuit Voltage
: 1.6V Approx.
3
Range
Accuracy
Overload Protection
2A
±(3% rdg + 5 dgt)
20A
±(2% rdg + 3 dgt)
400A AC Max.
200A
±(2% rdg + 5 dgt)
for 1 minute
400A
