M-142 Multifunction Calibrator
MEATEST, s.r.o.
108
User Manual v54
Counters and oscilloscopes
The calibrator can be used for basic calibration of the frequency ranges of multimeters and simple counters. The
calibrator provides the following functions:
•
calibration of frequency functions up to 20 MHz using squarewave signal. The function is activated by
pressing F direct mode button and selecting HF mode. Frequency can be set.
•
check of input sensitivity from 1 mV to 10 V in the frequency range up to 100 kHz. The function is
activated by pressing F direct mode button and selecting PWM mode. Frequency, amplitude and duty cycle
can be set.
•
calibration of time period using squarewave signal whose period can be set up to 10 s, with selectable duty
cycle. The function is activated by pressing F direct mode button and selecting PWM mode. Frequency,
amplitude and duty cycle can be set.
The instrument to be calibrated connects to FREQ connector using BNC/banana cable.
Connection of the frequency output
The calibrator can be used for basic calibration of oscilloscopes. The calibrator provides the following functions.
•
check of time base up to 20 MHz using squarewave signal. The function is activated by pressing F direct
mode button and selecting HF mode. Frequency can be set.
•
check of vertical channel input sensitivity from 1 mV to 10 V in the frequency range up to 10 kHz. The
function is activated by pressing F direct mode button and selecting PWM mode. Frequency, amplitude and
duty cycle can be set.
•
check of bandwidth using a signal up to 20 MHz with very steep rising edge (less than 5 ns). Calibration of
time period using squarewave signal whose period can be set up to 10 s, with selectable duty cycle. The
function is activated by pressing F direct mode button and selecting PWM mode. Frequency can be set. The
delay of the signal displayed on the oscilloscope’s screen is checked.
The oscilloscope to be calibrated connects to FREQ connector using a coaxial cable.
Thermometers
The calibrator can be used for calibration of transducers used in thermometers and heat meters, which use a
thermocouple or Pt or Ni sensor. The block connected to the sensor is checked, as it is disconnected from the
transducer and the calibrator’s output is connected to the transducer’s input instead. Simulation of thermal sensor
is activated by pressing T direct mode button. Pt and Ni resistance temperature sensors as well as K, N, R, S, B,
J, T, E thermocouples can be simulated.
The calibrator can be connected to transducer’s input in one of the following ways:
•
without the cable adapter, directly to Hi/Lo terminals. Temperature of cold junction must be compensated
by manual setting of RJ value. The connection is similar to voltmeter connection.
•
with cable adapter Option 140-01 to the terminals Hi/Lo. Automatic compensation of TC sensors cold
junction can be used here. The cable adapter is equipped with build-in Pt1000 temperature, which measures
ambient temperature. After build-in meter switching on (button INPUT ON) and with cable adapter 140-01
connected, automatic compensation of TC cold junction temperature is performed. When meter is
Counter to be calibrated
Coaxial cable
