Fluke 74X Series, Calibration Manual

Page: 11 / 44

Specifications
3
Specifications
All specifications apply from +18
°
C to +28
°
C unless stated otherwise.
All specifications assume a 5 minute warmup period.
Measurement specifications are valid only when damping is turned on. When damping is
turned off, or when the
gö
annunciator is displayed, floor specifications are multiplied
by 3. Floor specifications are the second part of the specifications, usually expressed as
"% of full scale." The measure pressure, temperature, and frequency functions are
specified only with damping on.
The standard specification intervals for the 74X Series is 1 and 2 years. Typical 90-day
source and measurement accuracy can be estimated by dividing the 1 year "% of
Reading" or "% of Output" specifications by 2. Floor specifications, expressed as "% of
f.s.", remain constant.
To achieve the best noise rejection, use battery power and tie all three common jacks
together when performing DC and AC measurements.
DC Voltage Measurement
Range Resolution % of R% of Full Scale
1 Year 2 Year
110 mV 1
µ
V 0.025% + 0.015% 0.05% + 0.015%
1.1V 10
µ
V 0.025% + 0.005% 0.05% + 0.005%
11V 100
µ
V 0.025% + 0.005% 0.05% + 0.005%
110V 1 mV 0.05% + 0.005% 0.1% + 0.005%
300V 10 mV 0.05% + 0.005% 0.1% + 0.005%
Temperature Coefficient: (0.001% of rdg. + 0.0015% f.s.)/
°
C in the ranges -10 to 18
°
C and 28 to 50
°
C
Input Impedance: 5 M
Ω
Common Mode Error: 0.008% f.s./(Common Mode Volt)
Maximum Input Voltage: 300V rms
AC Voltage Measurement
Frequency Range % of R Number of Counts
1 Year 2 Year
20 Hz to 40 Hz 2% + 10 2% + 10
40 Hz to 500 Hz 0.5% + 5 0.5% + 5
500 Hz to 1 kHz 2% + 10 2% + 10
1 kHz to 5 kHz 10% + 20 10% + 20
Ranges : 1.1000V, 11.000V, 110.00V, 300.0V rms
Resolution: 11.000 counts in all ranges except 300V; 3,000 counts on 300V range.
Input Impedance: 5 M
Ω
and <100 pF
Temperature Coefficient: 10% of specification/
°
C in the ranges -10 to 18
°
C and 28 to 50
°
C
Input Coupling: ac
Maximum Input Voltage: 300
°
V rms
Minimum Input Voltage: 0.5V above 1 kHz
Specifications apply for 10% to 100% of voltage range.