Page 470 - Instrumentation Reference Book 3E

Power measurement 453

Table 20.7 Comparison of digital voltmeter specifications
~
34-digit multimeter 5 -digit intelligent 8 f -digit Stunduvds
(Fluhe 8026E) niiibinzeter. Lnbomtoq. D I'M
(Thuviby 1905.4) (Soinrtroiz 7081)
D.c. voltage ranges 199.9mV-1000V 210.000mV-1100.00V 0.1 V-lO0OV
Typical accuracy &(O.l%R + 1 digit) I (0.015'1'0R + O.O015%S Short-term stability
+2 digits) h(1.2ppm R + 0.3ppm S)
Input impedance 10 MQ on all ranges > 1 GR on lowest two > 10 GR on 3 lowest ranges
ranges 10 Ma on remainder
10 MR on remainder
A.c. voltage ranges 1 99.9 mV-7 50 rms 310.00mV-750V rms 0.1 V-1000 V rms
Type True rms sensing Mean sensinghs True rms sensing crest
crest factor 3:l calibrated for sinusoid factor 5.1 short-term
stability
Typical accuracy f( 1VnR + 3 digits) f (2%R + 10 digits) +(0.05%R 1 0.03n/'S)
Frequency range 45 Hz-10 kHz 45 Hz-20 kHz 10Hz-1001~Hz
Input impedance 10 MQ 11 100 pF 10MR1147pF 1MRI/100pF
D.c. current ranges 1.999mA-1.999A 210.000 PA-2100.00mA
Typical accuracy i(0.75YnR + 1 digit) &(O.l%R+ O.O015%S+2
digits)
Voltage burden 0.3 V max. on all ranges 0.15 V max. on all ranges Not applicable
except 1.999 A range. except 2100mA range.
Max. burden on 1.999 A Max. burden on
range 0.9 V 2100mA range 0.75V
A.c. current ranges 1.999n-u-1.999A 210.00 PA-2100.0 mA
Type True rms sensing Mean sensinglrms
crest factor 3.1 calibrated for sinusoid
Typical accuracy f(1.5%R + 2 digits) i(0.30/oR + 5 digits) Not applicable
Frequency range 45 Hz-1 kHz 45 Hz-500 Hz
Voltage burden 0.3 V max. on all ranges 0.25 V max. on all ranges
except 1.999 A range. except 2100.0mA range.
Max. burden on 1.999A Max burden on
range 0.9V 2100.0mA range 0.75V
Resistance ranges 199.9 0-19.99 MR 2 IO ,000 R-2 1.000 MR 0.1 id-lOOOMR
Typical accuracy i(O.l%R + 1 digit) k(O.O4%R + O.O015%S + 2 Short-term stability (3ppm
digits) R + 0.4 ppm S)
Current employed Max. current 0.35 mA Max. current 1 mA on Max. current 1 mA on 0.1, 1
on 199.90 range 210.000R range and 10 kR ranges
Speed of reading 3 per second 100 per second to 1 pel
51.2s

Common-mode ,100dB at d.c.. 50Hz, and > 120 dB at d.c. or 50 Hz Effective CMR
rejection ratio 60 Hz with 1 kR unbalance [CMR + SMR] with 1 ki2
for d.c. ranges unbalance
>60 dB for 50 and 60 Hz 54- 84 digit >140dB at
with 1 kR unbalance on -50(6b) Hz
ax. ranges >I20 dB at
400 Hz
for ax. measurement
>40dB at 50(60) Hz
Series mode rejection >60dB at 50Hz or 60Hz >60 dB at 50 Hz 5! - 8; digits
/70 dB at 50(50) or 400 Hz
Continued