Instructions
Table Of Contents
- 1 Safety Features and Precautions
- 2 Operating Overview – Connections, Keys, Rotary Switch, Symbols
- 3 Initial Start-Up
- 4 Control Functions
- 5 Measurements
- 5.1 Voltage Measurement
- 5.1.1 Direct and Pulsating Voltage Measurement, V DC and V (DC+AC)
- 5.1.2 Alternating Voltage Measurement with 1 MW Load Resistance and Frequency Measurement with Selectable Low-Pass Filter (METRA HIT Extra, METRA HIT Etech and METRA HIT Especial only)
- 5.1.3 Alternating Voltage and Frequency Measurement V AC and Hz with Selectable Low-Pass Filter (METRA HIT Extra, METRA HIT Etech and METRA HIT Especial only)
- 5.1.4 Frequency and Duty Cycle Measurements (METRA HIT Extra only)
- 5.2 Resistance Measurement, W
- 5.3 Continuity Test
- 5.4 Diode Testing with a Constant Current of 1 mA
- 5.5 Temperature Measurement
- 5.6 Capacitance Measurement (METRA HIT Extra and METRA HIT Etech only)
- 5.7 Current Measurement
- 5.7.1 Direct and Pulsating Current Measurement, Direct Connection, A DC and A (DC+AC) (METRA HIT Extra, METRA HIT Etech and METRA HIT Especial only)
- 5.7.2 Alternating Current and Frequency Measurement, Direct Connection, A AC and Hz (METRA HIT Extra, METRA HIT Etech and METRA HIT Especial only)
- 5.7.3 Direct and Pulsating Current Measurement with Current Clamp Sensors, A DC and A (DC+AC)
- 5.7.4 Alternating Current Measurement with Current Clamp Sensors, A AC and Hz
- 5.7.5 Direct, Pulsating and Current Measurement with Current Clamps Transformer A DC, A (DC+AC), A AC and Hz (METRA HIT Extra, METRA HIT Etech and METRA HIT Especial only)
- 5.1 Voltage Measurement
- 6 Device and Measuring Parameters
- 7 Interface Operation
- 8 Technical Data
- 9 Maintenance and Calibration
- 10 Accessories
- 11 Index
40 GMC-I Messtechnik GmbH
V/Hz, , Temperature, and A/Hz Measurements
5.7 Current Measurement
Notes Regarding Current Measurement
• The multimeter may only be operated with installed batteries or
rechargeable batteries. Dangerous currents are otherwise not
indicated, and the instrument may be damaged.
•
The METRAHIT ESPECIAL multimeter does not have a fuse for the cur-
rent measuring range. It’s designed for measurements in current
transformer circuits and is approved for measuring category 600 V
CAT II
.
• Set up the measuring circuit in a mechanically secure fashion, and
secure it against inadvertent breaks. Select conductor cross-sec-
tions and lay out connections such that they do not overheat.
• An intermittent acoustic signal warns of current greater than 10 A.
An continuous acoustic signal warns of current greater than 16 A.
• The input for the current measuring range is equipped with a fuse
link. Maximum permissible voltage for the measuring
circuit (= rated voltage of the fuse) is 1000 V AC/DC.
Use specified fuses only! The fuse must have a
breaking
capacity of at least 30 kA
.
• If the fuse for the active current measuring range blows, “
FUSE
”
appears at the digital display, and an acoustic signal is
generated at the same time.
• If a fuse should blow, eliminate the cause of overload before plac-
ing the instrument back into service!
• Fuse replacement is described in chapter 9.3.
• Be absolutely certain that the measuring ranges are not
overloaded beyond their allowable capacities. Limit values are in-
cluded in chapter 8, “Technical Data”, in the table entitled “Meas-
uring Functions and Measuring Ranges” in the “Overload
Capacity” column.
Scope of Functions, Current Measurement, Direct Connection
* ) Special model without fuse for measuring-current transformer
Scope of Functions, Current Measurement via Current Clamp Sensors
Scope of Functions for Current Measurement with Current Clamps Transformer
Function METRAHIT
E
XTRA
METRAHIT
E
TECH
METRAHIT
E
SPECIAL
METRAHIT
E
BASE
A AC / Hz ~ 600 A
6/60/600 mA
6 A / 10 (16) A
60/600 mA
6 A / 10 (16) A
6 A / 10 (16) A
—
A AC+DC TRMS
600 A
6/60/600 mA
6 A / 10 (16) A
60/600 mA
6 A / 10 (16) A
6 A / 10 (16) A
—
A DC 600 A
6/60/600 mA
6 A / 10 (16) A
60/600 mA
6A / 10 (16) A
6 A / 10 (16) A
—
1000 V fuse
—* ) —
Function METRAHIT
EXTRA
METRAHIT
ETECH
METRAHIT
ESPECIAL
METRAHIT
EBASE
Transformation
Factor
A AC / Hz
A AC+DC
A DC
Hz (A AC)
... 60 kHz ... 60 kHz ... 60 kHz ... 60 kHz
Function METRAHIT EXTRA METRAHIT ETECH METRAHIT ESPECIAL
Transformation Factor
A AC / Hz
Hz (A AC)
... 60 kHz ... 60 kHz ... 60 kHz