Metrix MTX 3281 - Clock; Influences; Multimeter Traceability, Calibration

Technical specifications
38 100,000-count graphical multimeters
Technical specifications (cont’d)
Pulse width
PW+
PW-
MTX 3282
MTX 3283
Depending on triggering conditions of frequency meter.
Resolution 10 µs
Minimum pulse width 100 µs
Accuracy 0.05% ± 10 µs
Maximum period duration 12.5 s
Triggering threshold 20 % of range except range 1000 V AC
This threshold is positive in , negative in .
Additional error on measurement caused by slope when crossing zero: see §.
Measurement of duty ratio.

For negative events, cross the cables.
Clock
MTX 3281 Relative time with reset to zero at each
powering up
MTX 3282, MTX 3283 Real-time clock
Accuracy ≈ 30 s / month: real-time clock deviation
Display date - month - year / hour - minute - second
Influences
• Specifications of the accuracy in the field of utilization:
Typical specifications = SPEC (1 + 0,05 ∆ t °C)
Specification of the considered measurement. Values given p. 33 to 38.
∆ T: difference between ambient temperature and input terminal nearest to
the field of reference.
 Example : temperature : 38°C DC measurement : 0,02 % + 8 D
∆ t °C = 38 - 28 = 10°C
SPEC (38°C) = (0,02 % + 8 D) (1 + 0,05 ∗ 10)
= 0,03 % + 12 D
• Electric field under 3 V/m : 1 per thousand at full scale. This influence does
not depend on the temperature.
Multimeter
traceability,
Calibration
(refer to §.
Maintenance,
Metrological
verification)
In the « General settings », the menu Traceability opens a file with
multimeter up-datings :
• Model
• Serial No
• Firmware Version
• Hardware Version
• Last Calibration
• Next Calibration

A periodic calibration (once a year) of the multimeter is necessary
to guarantee the given specification.
TRACEABILITY
Serial No. : 10010110
Firmware Vers. : 1.00
Hardware Vers. : C
Model No. :
3283
Last Cal. :
27/11/2005 10:08:25
Next Cal. :
27/11/2006 10:08:25
CALIBRATION