METRAHit 28S True RMS Digital Multimeter
METRAHit 28S multimeter 5¾ place, multifunctional, precision digital TRMS multimeter, system compatible, CAT.IV
Precision multimeter for universal use in the field of energy electronics, and for high bandwidth electronics applications from 16 Hz to 100 kHz, TRMS _ACand TRMS _AC+DC

• Rugged digital multimeter,± 310,000 digits,

• With triple display

• Automatic blocking system (ABS)

• IR interface, V _DC, V_AC/DC, V _AC, mA _DC, mA_AC/DC, 
  to max. 10 A_AC/DC, Ohm, 
  °C (Pt100/Pt1000, type J and K thermocouples)

• Continuity and diode testing

• MIN-MAX measurement value storage, DATA hold

• Minimal inherent deviation± (0.02% + 10 digits for V _DC )

• With cable set, protective rubber cover and
  calibration certificate

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

METRAHit 28S 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.

Convenient Triple Display
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 METRAHit28S: 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 METRAwin10/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.

Additional Functions
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.

Overload Protection
The instrument is protected from overload in the voltage range. 
Acoustic signaling occurs if measuring range limits are exceeded.
The FUSE display indicates a defective fuse in the current range.

Calibration
METRAHit 28S multimeters are shipped with calibration certificate. 
They can be automatically calibrated with the CS92E calibration system via the RS232 data interface.

Infrared Measurement Data Transmission
These devices include a serial, duplex data interface for remote control and measurement value transmission via infrared light.

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.

Automatic Measurement Value Storage *
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 at the digital display. 
Protected by patent

Sampling Rate
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.

Memory Mode
The METRAHit 28S 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 METRAHitBD232 IR adapter, and with METRAwin10/METRAHit analysis software.