Read Rate And Additional Uncertainty - Fluke 8508A User Manual

8508A
Users Manual

Read Rate and Additional Uncertainty

Function
DCV, DCI & Ohms
[10]
[6]
ACV & ACI
ACV Transfer Off
[6]
PRT & Tru Ohms
[14]
Notes to Performance Specifications
Fluke guarantees 8508A performance verification using specifications stated to 99 % confidence level.
[1] Specifications apply for max resolution in each function, normal mode
[2] Assumes 4 hour warm-up period
[3] Input zero or offset null required whenever the temperature moves more than ±1 °C from the temperature at which the previous
null/zero was performed
[4] TCal = Ambient calibration temperature
[5] Integration time >1 Power Line cycle
[6] Valid for signals >1 % Full Scale, Transfer Mode On. Signals must be DC coupled <40 Hz. Readings invalid with Transfer Mode On
and 1Hz filter selected when using internal trigger mode
[7] Max Volt.Hertz 3 x 10
[8] >300 V, <10 kHz add: ±0.0004 x (Reading-300)
>300 V, 10 kHz - 30 kHz add: ± (0.0004 + (Frequency - 10000) x10
>300 V, >30 kHz add: ±0.0024 x (Reading-300)
[9] Typical below 10 Hz for ACV, below 10 Hz and above 10 kHz for ACI, and above 2 G for Resistance
[10] Tru Ohms mode available on 2
corresponding Normal or Lo Current range
[11] Valid for 4-wire sensor
[12] Not including sensor uncertainty
[13] Assume Range and Full Scale = 2000 V when calculating for 1000 V Range. For DCI, additional errors only apply in 5 digit
resolution
[14] Fast mode not available in PRT
[15] The maximum display value for the Analog to Digital converter is 199 990 000 counts. This sets the maximum value measurable on
each range to be a one followed by four nines. For example, the maximum measured values on the 2 V range on DC Voltage are
±1.999 900 00 V. However, the 1000 V ranges are limited to a maximum 1050 V.
5-14

Read Rate and Additional Uncertainty

Filter
Resolution Frequency
(Hz)
8
7
6
5
6 1
10
40
100
5 1
10
40
100
1
10
40
100
8 -
7 -
6 -
5 -
7
2
ppm
2
ppm
to 20 k ranges. Read Rate reduced in Tru Ohms Mode. Specification for Tru Ohms same as
Read Rate
(readings/second)
Normal Fast
1/25 1/6
1/6 1/2
2 35
35 150
1/50
1/5
1/2
1
1/50
1/5
1/2
2
1/25
1/2.5
1
4
1/90 1/30
1/30 1/10
1/4 1/3
1/3 1/3
-7 2
) x (Reading-300) ppm
[13]
Additional Errors
± (ppm Reading + ppm Range)
Normal Fast
0 + 0 0 + 0.1
0 + 0.1 0 + 0.5
1.0 + 0.5 0 + 2.5
0 + 5 0 + 25
0 + 0
0 + 0
0 + 0
0 + 0
0 + 5
0 + 5
0 + 5
0 + 5
200 + 20
200 + 20
200 + 20
200 + 20
0 + 0
0 + 0.1
1.0 + 0.5
0 + 5