GMC Instruments MetraHIT
Model 29S Power Multimeter

METRAHit 28S and 29S multimeters are high performance precision
instruments for the lab, service and training.With a display range of
300,000 digits as well high level accuracy and long-term stability, they
fulfill all calibration and R&D laboratory demands. Battery operation allows
for on-site precision servicing and calibration.

The current measurement value, as well as two other values, are
updated and displayed, e.g. minimum and maximum value. The usual
switching back and forth between display values is no longer necessary.
Display resolution for the main display value can be varied from 4¾ places
for AC to 5¾ places for DC (METRAHit-29S: from 2¾ to 5¾ places).
The measurement rate, adjustable from 1 ms to 0.5 s, allows for
high-speed recorder,precision data logger and mean value recorder
functions with the help of METRAwin-10/METRAHit (optional PC software).
High Resolution and Precision 5¾ places, or 309,999 digits, allow for cost
effective calibration of tested devices and components, as well as precise
reference measurements.

Effective Value for Distorted Waveforms - The implemented measurement
process provides for effective value measurement (TRMS) independent of
the waveform up to 100 kHz. Continuity testing with acoustic signal, event
counting (number of events and event durations), counts zero crossings,
stopwatch, data comparison and wide-range capacitance measurement.
The integrated temperature measurement function allows for the connection
of thermocouples and platinum resistance thermometers. The instrument is
protected from overload in the voltage range. Acoustic signalling occurs if
measuring range limits are exceeded. The FUSE display indicates a defective
fuse in the current range.

These instruments include a serial, duplex data interface for remote control and
measurement value transmission via infrared light. The DATA HOLD function
allows for storage of the digitally displayed measurement value. A patented
process assures that the actual measurement value, and not random values,
are stored when rapid measurement magnitude changes occur. The stored
measurement value appears on the digital display.

Automatic Blocking System (ABS)












Automatic blocking of connector sockets prevents incorrect connection
of measurement cables, and selection of incorrect measuring
quantities. Thus hazards for the operator, the instrument
and the system are substantially reduced, and in many cases entirely eliminated.

The sampling rate determines the time interval after which the
respective measurement value is transmitted to the interface, or
saved to measurement value memory.
Depending upon the measured quantity, sampling rates can be
set in steps of 1, 2 or 5 from 0.05 s to 10 min.

Additional Functions, METRAHit 29S

Power Measurement

The METRAHit-29S is a compact high performance measurement
instrument for direct and alternating current for single and
three-phase current measurements. The current path can be connected
directly, or with a clip-on current transformer. If a current
transformer is connected to the multimeter (mA or A input), all
current and power displays appear with the correct value in
accordance with the selected transformation ratio. The utilized
current transformer must have a transformation ratio of 1000:1 or
10,000:1.

Universal power measuring functions include the measurement of
active, reactive, and apparent power, as well as power factor and
energy. Furthermore, mean and peak values (e.g. a 15 minute max. value)
can be measured during a predefined period of time. Type
WZ12D, Z3511, Z3512 and Z3514 current clips are suitable for
use with the instrument. The instrument is capable of continuously
recording line voltage and power disturbances. The following power
disturbances can be acquired: violation of predetermined limit values,
power failure and positive or negative pulses. Each of these events is
stored to memory and can be queried at a later point in time. The type of
event, the time of its occurrence and its duration (except forpulses) are
displayed.

Power Disturbance Measurment

If memory mode is deactivated, approximately 250 events can be stored
to volatile memory and read out at the display. These data remain in
storage until the instrument is switched to a different operating mode. If memory
mode is activated, the events are recorded at the instrument as a non-compressed
data file which is uploaded to a PC at a later point in time.

Memory Mode

The instrument is equipped with a 128 kB measurement value
memory which is synchronized with a quartz movement, and
which has room for 13,000 to 60,000 measurement values
depending upon configuration. Data can be stored to intermediate
memory or uploaded directly to a PC. The system records
data relative to real-time which allows for use as a real time data logger.

Depending upon the measured quantity, sampling rates can be
adjusted in steps of 1, 2 or 5 within a range of 0.5 ms to 10 min.
Selected measurement values can also be stored to memory by pressing a key.

The contents of the memory can be read out with the help of a
PC which has been connected to the multimeter via the METRAHit-BD232 IR
adapter, and with METRAwin-10 analysis software.

FEATURES:

Rugged Digital Multimeter, +/-310,000 Digits,

With Triple Display

Automatic Blocking System (ABS) Protects Users from Test Lead Used
In the Wrong Jacks for the Selected Measurement

IR Data Interface, V _DC, V_AC/DC, V _AC, mA _DC, mA_AC/DC, to max. 10 A_AC/DC,
Ohm, Deg C (Pt100/Pt1000, type J and K thermocouples), W, VA, Var, Wh, Vah,
peak load profile, power disturbance measurements, power disturbance recording

Continuity and Diode Testing

MIN-MAX Measurement value Storage, DATA Hold

Minimal Inherent Deviation +/-(0.02% V _DC )

With Lead Set, Protective Rubber Holster and Factory Calibration Certificate

CSA certification 600 V CAT.IV or 1000 V CAT.III per IEC 61010-1