Fluke 8508A - Read Rate and Additional Uncertainty

8508A
Service Manual
1-18
Read Rate and Additional Uncertainty
Read Rate and Additional Uncertainty
Read Rate
(readings/second)
Additional Errors
[13]
± (ppm Reading + ppm Range)
Function Resolution
Filter
Frequency (Hz)
Normal Fast Normal Fast
8 1/25 1/6 0 + 0 0 + 0.1
7 1/6 1/2 0 + 0.1 0 + 0.5
6 2 35 1.0 + 0.5 0 + 2.5
DCV, DCI & Ohms
[10]
5 35 150 0 + 5 0 + 25
6 1 1/50 0 + 0
10 1/5 0 + 0
40 1/2 0 + 0
100 1 0 + 0
5 1 1/50 0 + 5
10 1/5 0 + 5
40 1/2 0 + 5
ACV & ACI
[6]
100 2 0 + 5
1 1/25 200 + 20
10 1/2.5 200 + 20
40 1 200 + 20
ACV Transfer Off
[6]
100 4 200 + 20
8 - 1/90 1/30 0 + 0
7 - 1/30 1/10 0 + 0.1
6 - 1/4 1/3 1.0 + 0.5
PRT & Tru Ohms
[14]
5 - 1/3 1/3 0 + 5
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
7
[8] >300 V, <10 kHz add: ±0.0004 x (Reading-300)
2
ppm
>300 V, 10 kHz - 30 kHz add: ± (0.0004 + (Frequency - 10000) x10
-7
) x (Reading-300)
2
ppm
>300 V, >30 kHz add: ±0.0024 x (Reading-300)
2
ppm
[9] Typical below 10 Hz for ACV, below 10 Hz and above 10 kHz for ACI, and above 2 GΩ for Resistance
[10] Tru Ohms mode available on 2 Ω to 20 kΩ ranges. Read Rate reduced in Tru Ohms Mode. Specification for Tru Ohms same as
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.