Greenlee CMT-90, Инструкция по эксплуатации, Страница: 11 / 44

11
CMT-90
Accuracy
Refer to “Specifications” for operating conditions and temperature coefficient.
Accuracy is specified as follows:
±
(a percentage of the r a fixed
amount) at 23
°
C
±
5
°
C (73.4
°
F
±
9
°
F), 0% to 80% relative humidity.
Accuracy for AC measurements is specified for input crest factors that do not
exceed the values in the “Maximum Input Crest Factor” table on this page.
Accuracy Table
Characteristic Range Accuracy
Frequency
Range
0.6 to 170.0 A
±
(1.9% + 1 A)
AC Current
170.1 to 600.0 A
±
(1.9% + 2 A)
50 to 60 Hz
AC Voltage* 1.3 to 999.9 V
±
(1.5% + 0.3 V) 50 to 500 Hz
DC Voltage*
1.8 to 999.9 V
±
(1.0% + 0.2 V)
N/A
–0.6 to –999.9 V
±
(1.0% + 0.4 V)
Resistance**
0.0 to 99.9
Ω ±
(2% + 1.0
Ω
)†
N/A
100 to 2000
Ω ±
(2% + 2
Ω
)†
* Input impedance: 4 k
Ω
nominal at voltages up to 30 V;
increases with voltage to approximately 277 k
Ω
at 1000 V
** Open circuit voltage: 1.5 V maximum
† Multiply temperature coefficient times 1.5 when operating temperature
is above 40
°
C.
Maximum Input Crest Factor
Continuity
Tone on: Circuit resistance is
≤
25
Ω
(approximately).
Tone off: Circuit resistance is
≥
400
Ω
(approximately).
Maximum Current Voltage
Crest Factor Range Range
1.414 0.6 to 6.0 A 1.3 to 3.0 V
3 6.1 to 20.0 A 3.1 to 10.0 V
5 20.1 to 500.0 A 10.1 to 250.0 V
Linear decrease from
5 to 1.5 over 500.1 to 600.0 A 250.1 to 999.9 V
range shown