GMC Instruments MetraHIT
Model 30M Precision Multimeter

The GMC Instruments MetraHIT 30M multimeter is a high performance,
precision measuring instrument for R&D labs, industrial applications, universities,
government agencies, test stands, manufacturing, Quality Assurance and instrument
service & calibration companies. With a display range of 1,200,000, as well as
exceptional accuracy and long-term stability, it fulfills all of the demands of calibration
and R&D labs. Battery operation allows for mobile use of the
instrument for demanding maintenance work and field calibration
tasks. An optional ac adapter can be utilized for stationary,
long-term operation on the bench. The 30M is the only 6.5 digit hand held
multimeter available. No portable multimeter can meets its
accuracy specifications!

TRMS Measurement for Distorted Waveshapes

The utilized measuring method allows for TRMS measurements
for up to 100 kHz at crest factors of up to 10, independent of the
waveshape.

Sampling Rate

The sampling rate determines the interval at which the respective
measurement value is saved to memory. Depending upon measured
quantity and resolution, the interval can be set within a
range of 0.01 s to 60 s.

Automatic and Manual Measuring Range Selection

The desired measured quantity is selected with the rotary switch.
The measuring range is automatically adapted to the measured
quantity. The measuring range can also be selected manually.

Averaging Filter

A digital filter (1/2/4/8/16 measurement values) is used to smooth
noisy measurement signals.

Storing MIN-MAX Values to Memory

In addition to displaying the current measurement value, the minimum
or maximum value can be continuously updated and stored
to memory at the selected sampling rate.

Overload Protection

The instrument is protected against overloading in all measuring
functions. All current measuring ranges are equipped with a selfresetting,
electronic fuse.

Battery Saver Circuit

The instrument is shut down automatically if the measurement
value remains unchanged for approximately 10 minutes, and if
none of the operating elements have been activated during this
time. Automatic shut-down can be disabled.

Protective Cover for Rugged Use

A soft rubber boot with tilting stand protects the instrument from
damage due to impacts or drops. The rubber material provides
the instrument with a secure stance, even if it has been set up on
a vibrating surface.

Memory Mode

The instrument is equipped with a 128 kB measurement value
memory with backup battery. The memory can be laid out in 1 to
15 blocks. New values can be written to memory, even after completion
of a given measurement without loss of data, until the
maximum capacity of 30,000 measurement value has been used
up. The data can be stored to intermediate memory, or uploaded
directly to a PC. The system records measurement values in relative
time. Use as a real-time data logger is not possible.
Depending upon the measured quantity, the interval can be set in
steps of 10 ms, 100 ms, 1 s, 10 s and 60 s. Individual measurement
values can also be saved to memory by pressing a key.
The contents of the memory can be read out with the help of
METRAwin 10/METRAHit analysis software and a PC which
has been connected to the multimeter via the METRAHit BD232
IR adapter. The measuring instrument includes a serial, duplex
data interface for remote control and transmission of data via infrared light.

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